InoLab 740 Manual (pH Meter Manual)

inoLab 740with terminal 740

Operating manual

inoLab 740measuring system with

active multifunction boxesand 740 terminal

AR

RUNENTER

inoLab

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inoLab 740

Accuracy whengoing to press

The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

Warranty We guarantee the instrument described for 3 years from the date of purchase. The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e. g. batteries.

The warranty claim extends to restoring the instrument to readiness for use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim.

To ascertain the warranty liability, return the instrument and proof of purchase together with the date of purchase freight paid or prepaid.

Copyright © Weilheim 2010, WTW GmbHReprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim.Printed in Germany.

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inoLab 740 Contents

inoLab 740 - Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1 Measuring module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.2 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.2.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111.2.2 Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121.2.3 Sockets on the terminal . . . . . . . . . . . . . . . . . . . 131.2.4 Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 16

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.2 Preparing the inoLab 740 measuring system . . . . . . . . . 203.3 Switching on the measuring system . . . . . . . . . . . . . . . . 253.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263.5 Updating the terminal software (firmware) . . . . . . . . . . . 27

3.5.1 Checking the version no. of the terminal firmware . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.5.2 Starting the update of the terminal firmware . . . 28

4 Basic principles of operation. . . . . . . . . . . . . . . . . . . . 314.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.1.1 Status display indicators . . . . . . . . . . . . . . . . . . 324.1.2 Softkey functions . . . . . . . . . . . . . . . . . . . . . . . . 344.1.3 Symbols in the Menu mode . . . . . . . . . . . . . . . . 354.1.4 Display of measured values . . . . . . . . . . . . . . . . 36

4.2 Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384.2.1 Keys on the terminal . . . . . . . . . . . . . . . . . . . . . 394.2.2 Keys on the measuring module . . . . . . . . . . . . . 404.2.3 IBM PC keyboard . . . . . . . . . . . . . . . . . . . . . . . . 414.2.4 Barcode reader . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3 Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424.4 Output of measured data . . . . . . . . . . . . . . . . . . . . . . . . 46

4.4.1 Measured data display on the screen . . . . . . . . 464.4.2 Measured data output on the integrated printer . 474.4.3 Outputting measured data to the

RS232/REC interface. . . . . . . . . . . . . . . . . . . . . 47

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Contents inoLab 740

5 System settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495.1 Date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495.2 Changing the language . . . . . . . . . . . . . . . . . . . . . . . . . . 505.3 Display settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

5.3.1 Display contrast . . . . . . . . . . . . . . . . . . . . . . . . . 515.3.2 Display illumination . . . . . . . . . . . . . . . . . . . . . . . 52

5.4 Acoustic signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 535.5 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

5.5.1 Temperature unit . . . . . . . . . . . . . . . . . . . . . . . . 545.5.2 Measuring the temperature. . . . . . . . . . . . . . . . . 55

5.6 User profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575.6.1 Opening the Administration menu . . . . . . . . . . . 595.6.2 Opening the Administration window . . . . . . . . . . 595.6.3 Creating, editing, or deleting a user profile . . . . . 605.6.4 Printing the list of user profiles . . . . . . . . . . . . . . 61

5.7 Password for user names . . . . . . . . . . . . . . . . . . . . . . . . 625.7.1 Changing the password . . . . . . . . . . . . . . . . . . . 625.7.2 Assigning a password. . . . . . . . . . . . . . . . . . . . . 635.7.3 Forgotten the password? . . . . . . . . . . . . . . . . . . 63

5.8 Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

6 pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 676.1 Settings for pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

6.1.1 Displaying pH/ISE or measured voltage values . 676.1.2 Setting the pH display. . . . . . . . . . . . . . . . . . . . . 676.1.3 Measured value resolution of voltage display. . . 686.1.4 Measured value resolution of pH display . . . . . . 696.1.5 Resetting to default settings . . . . . . . . . . . . . . . . 70

6.2 Calibrating pH measurements . . . . . . . . . . . . . . . . . . . . . 716.2.1 Buffer sets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 736.2.2 Calibration settings . . . . . . . . . . . . . . . . . . . . . . . 746.2.3 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6.3 Measuring the pH value. . . . . . . . . . . . . . . . . . . . . . . . . . 836.4 Measuring the ORP voltage. . . . . . . . . . . . . . . . . . . . . . . 85

7 Ion concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 877.1 Settings for ISE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

7.1.1 Displaying pH/ISE or measured voltage values . 877.1.2 Setting up the ISE display . . . . . . . . . . . . . . . . . 877.1.3 Determining the measuring range . . . . . . . . . . . 887.1.4 Measured value resolution of voltage display. . . 897.1.5 Resetting to default settings . . . . . . . . . . . . . . . . 89

7.2 Advanced settings for ISE . . . . . . . . . . . . . . . . . . . . . . . . 907.2.1 Units of the ISE display. . . . . . . . . . . . . . . . . . . . 907.2.2 Blank value correction (Bw Corr) . . . . . . . . . . . . 917.2.3 Reference measurement (Ref Meas) . . . . . . . . . 927.2.4 Criterion for AutoRead (AutoRead). . . . . . . . . . . 93

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7.3 Calibration for ion-selective measurements . . . . . . . . . . 947.3.1 Two-point and three-point calibration. . . . . . . . . 977.3.2 Four-point to six-point calibration . . . . . . . . . . . 100

7.4 Measuring the ion concentration . . . . . . . . . . . . . . . . . . 1027.4.1 Select the measuring method . . . . . . . . . . . . . 1037.4.2 Standard Addition (Std Add) . . . . . . . . . . . . . . 1057.4.3 Double Standard Addition (Std Add ++). . . . . . 1077.4.4 Standard Subtraction (Std Sub) . . . . . . . . . . . 1097.4.5 Sample Addition (Smp Add) . . . . . . . . . . . . . . 1117.4.6 Sample Subtraction (Smp Sub). . . . . . . . . . . . 1137.4.7 Standard addition with blank value

correction (Bw Add) . . . . . . . . . . . . . . . . . . . . . 116

8 Dissolved oxygen (D. O.) . . . . . . . . . . . . . . . . . . . . . . 1198.1 Settings for D. O. measurements . . . . . . . . . . . . . . . . . 119

8.1.1 Determining the measuring range . . . . . . . . . . 1198.1.2 Displaying the air pressure. . . . . . . . . . . . . . . . 1208.1.3 Salinity correction. . . . . . . . . . . . . . . . . . . . . . . 1208.1.4 Resetting to default settings. . . . . . . . . . . . . . . 122

8.2 Calibrating for D. O. measurements . . . . . . . . . . . . . . . 1238.2.1 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1258.2.2 Calibrating with the air calibration vessel . . . . . 1268.2.3 Calibrating via a comparison measurement . . 127

8.3 Measuring the D. O. content . . . . . . . . . . . . . . . . . . . . . 1288.3.1 Selecting the measured value display . . . . . . . 1298.3.2 Drift control (AutoRead) . . . . . . . . . . . . . . . . . . 130

9 BOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1329.1 General information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

9.1.1 Operation with the StirrOx G oxygen sensor . . 1339.1.2 Operation with a barcode reader . . . . . . . . . . . 133

9.2 BOD measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1349.2.1 Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1349.2.2 Start measurement. . . . . . . . . . . . . . . . . . . . . . 1349.2.3 Stopping the BOD measurement . . . . . . . . . . . 1409.2.4 End measurement . . . . . . . . . . . . . . . . . . . . . . 140

9.3 BOD result. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1449.3.1 Displaying, editing and printing the

measurement result . . . . . . . . . . . . . . . . . . . . . 1449.3.2 Deleting BOD measurement results. . . . . . . . . 147

9.4 Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1489.4.1 Setting up routines . . . . . . . . . . . . . . . . . . . . . . 1489.4.2 Starting a measurement with routine . . . . . . . . 1499.4.3 Deleting routines . . . . . . . . . . . . . . . . . . . . . . . 149

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Contents inoLab 740

10 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15110.1 Settings for conductivity measurements . . . . . . . . . . . . 151

10.1.1 Determining the measuring range . . . . . . . . . . 15110.1.2 Entering the reference temperature . . . . . . . . . 15210.1.3 Displaying the conductivity or specific

resistance . . . . . . . . . . . . . . . . . . . . . . . . 15310.1.4 Setting the temperature compensation. . . . . . . 15410.1.5 Reset (Reset) . . . . . . . . . . . . . . . . . . . . . . . . . . 155

10.2 Determining/setting up the cell constant . . . . . . . . . . . . 15610.2.1 Determining the cell constant (calibration) . . . . 15610.2.2 Setting the cell constant . . . . . . . . . . . . . . . . . . 159

10.3 Measuring the conductivity . . . . . . . . . . . . . . . . . . . . . . 16310.3.1 General information . . . . . . . . . . . . . . . . . . . . . 16310.3.2 Displaying the conductivity, dry filtrate

residue or salinity . . . . . . . . . . . . . . . . . . . . . . . 16310.3.3 Drift control (AutoRead) . . . . . . . . . . . . . . . . . . 164

11 Data storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16711.1 Storage of measurement data records . . . . . . . . . . . . . 167

11.1.1 Saving individual measurement data records. . 16811.1.2 Automatically storing measurement data

records . . . . . . . . . . . . . . . . . . . . . . . . . . 16911.1.3 Displaying stored measurement data records . 17211.1.4 Deleting stored measurement data records . . . 176

11.2 Storage of system configurations . . . . . . . . . . . . . . . . . 17811.2.1 Saving the system configuration. . . . . . . . . . . . 17811.2.2 Recalling a system configuration . . . . . . . . . . . 17911.2.3 Deleting a system configuration . . . . . . . . . . . . 180

11.3 Storage of calibration records . . . . . . . . . . . . . . . . . . . . 181

12 Data output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18312.1 Data output to the display . . . . . . . . . . . . . . . . . . . . . . . 184

12.1.1 Numerical display . . . . . . . . . . . . . . . . . . . . . . 18412.1.2 Graphical display . . . . . . . . . . . . . . . . . . . . . . . 185

12.2 Outputting data to the integrated printer . . . . . . . . . . . . 18912.2.1 General information . . . . . . . . . . . . . . . . . . . . . 18912.2.2 Switching on the integrated printer . . . . . . . . . 19012.2.3 Data output to the integrated printer . . . . . . . . 19012.2.4 Printing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

12.3 Outputting data to an external printer/PC . . . . . . . . . . . 19412.3.1 Outputting data to the RS232/REC interface . . 19512.3.2 Setting the baud rate . . . . . . . . . . . . . . . . . . . . 19512.3.3 Determining the data format . . . . . . . . . . . . . . 19612.3.4 Setting the print interval . . . . . . . . . . . . . . . . . . 19812.3.5 Outputting data to an external printer or PC . . 199

12.4 Outputting data to the external recorder . . . . . . . . . . . . 199

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13 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . 20113.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

13.1.1 Replacing the batteries . . . . . . . . . . . . . . . . . . 20113.1.2 Changing the roll of paper. . . . . . . . . . . . . . . . 20213.1.3 Maintenance of the probes. . . . . . . . . . . . . . . . 202

13.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20313.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

14 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20514.1 Terminal messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20514.2 Printer messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20614.3 pH/voltage system messages . . . . . . . . . . . . . . . . . . . 20714.4 Ion concentration system messages . . . . . . . . . . . . . . 20914.5 Oxygen system messages . . . . . . . . . . . . . . . . . . . . . . 21114.6 Conductivity system messages . . . . . . . . . . . . . . . . . . 213

15 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21515.1 Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21715.2 Measuring module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22015.3 pH/electromotive force of the electrode: . . . . . . . . . . . . 22115.4 Ion concentration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22315.5 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22415.6 Conductivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

16 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22916.1 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23016.2 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23216.3 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

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Contents inoLab 740

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inoLab 740 Overview

1 Overview

The inoLab 740 measuring system is suitable for operating with an inoLab 740 terminal and also with a PC.

This manual contains a description of the operation of inoLab 740 with terminal.

NoteThe operation of inoLab 740 measuring modules on the PC with the MultiLab pilot software is described in a separate operating manual.

The newest software version of MultiLab pilot is available on the Internet under http://www.wtw.com.

NoteInformation on other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or is available via the Internet.

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Terminal Measuring module (active multifunction box)

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Overview inoLab 740

1.1 Measuring module

The inoLab 740 measuring system works together with the following inoLab 740 active multifunction boxes:

pH, pH/ION, Oxi, BSB/BOD, Cond, pH/Cond and Multi.

Each inoLab 740 measuring module has its own fixed software in order to process the probe signals and to communicate with the terminal.

A detailed description of the operating elements on the measuring module can be found in chapter 4 BASIC PRINCIPLES OF OPERATION.

Measuring module

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inoLab 740 Overview

1.2 Terminal

The terminal is both the display and entry unit of the system. The settings for the measurement and display of the measured values are menu-driven via the display. The terminal is optionally equipped with an integrated printer. The terminal recognizes the type of inoLab 740 measuring module connected and the probe operated with the measuring module via the connection cable.

1.2.1 Display

The measured value, active functions or settings and available menu items that are displayed always correspond to the active probe and the selected measured variable.

The display of the terminal shows:

1 Menu line to select the measuring and display settings

2 Type of temperature measurement, i.e. manual entry, external or integrated temperature probe

3 Status line that displays the active functions and settings

4 Softkey functions

5 Current measured temperature value

6 Current measured value

7 Selected measured variable

1

2

34

567

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Overview inoLab 740

1.2.2 Keys

The inoLab 740 measuring system has a keypad on the terminal and one on the measuring module. The terminal keys operate the entire measuring system. Using the g and a keys on the measuring module, you can also operate the AutoRead function (drift control) on the measuring module. The LED on the measuring module shows the AutoRead status.

The topmost row of keys on the terminal consists of softkeys.Each softkey carries out the softkey function that is displayed directly above the key.

A detailed diagram and description of the keys and softkeys is given in chapter 4 BASIC PRINCIPLES OF OPERATION.

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Terminal Measuring module

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1.2.3 Sockets on the terminal

WarningThe line voltage on site must lie within the input voltage range of the original plug-in power supply unit. Use original plug-in power supplies only (see chapter 15 TECHNICAL DATA).

Connections:

1 Plug-in power supply unit

2 inoLab 740 measuring module

3 RS 232 interface/analog output

4 IBM PC keyboard (via adapter cable AK T-K PS2)

1

2

3

4

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Overview inoLab 740

1.2.4 Firmware

The inoLab 740 terminal software (firmware) can be updated. You can always install the newest software version for the terminal via a connected PC and a special update program.The details of the update are given insection 3.5 and in the installation program for the update.

NoteFurther information on the latest software version is available from WTW or on the Internet under http://www.WTW.com.

The addresses and telephone numbers of the WTW subsidiaries are given on the cover of this operating manual.

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inoLab 740 Safety

2 Safety

This operating manual contains basic instructions that must be followed in the commissioning, operation and maintenance of the inoLab 740 (terminal and measuring module) measuring system. Consequently, all responsible personnel must read this operating manual carefully before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.

Target group The measuring system was developed for use in the laboratory. Thus, we assume that, as a result of their professional training and experience, the operators will know the necessary safety precautions to take when handling chemicals.

Symbolsused

Warningindicates safety instructions that must be followed to prevent damage to persons and property.

Noteindicates notes that draw your attention to special features.

Noteindicates cross-references to other documents, e.g. application reports, operating manuals of probes, etc.

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Safety inoLab 740

2.1 Authorized use

This measuring system is authorized exclusively for potentiometric, conductimetric or amperometric measurements in the laboratory. The technical specifications as given in chapter 15 TECHNICAL DATA must be observed. Only the operation and running of the measuring instrument according to the instructions given in this operating manual is authorized. Any other use is considered unauthorized.

2.2 General safety instructions

This measuring system is constructed and tested in compliance with the EN 61010-1 safety regulations for electronic measuring instruments. It left the factory in a safe and secure technical condition.

Function and operatingsafety

The smooth functioning and operational safety of the measuring system can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are followed during operation.

The smooth functioning and operational safety of the instrument can only be guaranteed under the environmental and electrical operating conditions that are in specified in chapter 15 TECHNICAL DATA.

If the measuring system was transported from a cold environment to a warm environment, the formation of condensate can impair the functioning of the measuring system. In this event, wait until the temperature of the measuring system reaches room temperature before putting the measuring system back into operation.

WarningThe measuring system is only allowed to be opened by personnel authorized by WTW.

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inoLab 740 Safety

Safe operation If safe operation is no longer possible, the measuring system must be taken out of service and secured against inadvertent operation!Safe operation is no longer possible if the measuring system (terminal or measuring module):

has been damaged in transport

has been stored under adverse conditions for a lengthy period of time

is visibly damaged

no longer operates as described in this manual.

If you are in any doubt, please contact the supplier of the measuring system.

Obligations of thepurchaser

The purchaser of this measuring system must ensure that the following laws and guidelines are observed when using dangerous substances:

EEC directives for protective labor legislation

National protective labor legislation

Safety regulations

Safety datasheets of the chemical manufacturers.

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Safety inoLab 740

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inoLab 740 Commissioning

3 Commissioning

3.1 Scope of delivery

The inoLab 740 Set includes: inoLab 740 terminal, 740 measuring module and probe (depending on the composition of the inoLab 740 set)

Operating and display instrument

– inoLab 740 terminal

– Plug-in power supply with country-specific adapters(for Great Britain, United States of America, Europe and Australia)

– RS 232 interface cable, AK T-PC (for data transmission on the PC and software update).

Measuring module (active multifunction box)

– inoLab 740 measuring module (depending on how the set is made up)

– Connecting cable (AK M-T) from the measuring module to the terminal

– Stand rod

– Probe holder

– Locking holder for non-active probes

– for BSB/BOD measuring module: Adapter cable AK T-K PS2 for connecting a barcode reader or an IBM-PC keyboard to the measuring module

Software MultiLab pilot on CD-ROM

Connecting cable AK M-PC from the measuring module to the PC

Operating manual for terminal and measuring module

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Commissioning inoLab 740

3.2 Preparing the inoLab 740 measuring system

A measuring module that is ready for operation looks as follows:

1 Cable holder

2 Stand rod

3 Opening to the cable shaft

4 Connection cable to the terminal (AK M-T)

6 Locking holder

7 Beaker with test solution

8 Probe

9 Freely adjustable probe holder

10 Locking key for probe holder

11 Connection cable: Probe - measuring module

AR

RUNENTER

inoLab

7

8

9

10

112

1

3

4

5

6

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Perform the following activities before commissioning the system:

Prepare the measuring module

Connect the probe

Connect the terminal

Connect the plug-in power supply

Connect the system upgrades

Preparing themodule

Connecting theprobe

1 Place the measuring module on a flat surface and protect it from intense light and heat.

2 Insert the stand rod (2) into the measuring module.

3 Fix the probe holder (9) onto the stand rod.

4 Adjust the height of the probe holder (9) using the locking key (10).

5 Place the probe (8) into the probe holder (9).

6 Place the cable (11) of the probe (8) into the cable holder (1) on the stand rod.

Connections depending on the measuring module:

12 pH/ORP electrode or ion-selective electrode

13 D. O. probe or conductivity cell

14 Oxygen probe with integrated stirrer (StirrOx G)

15 Reference electrode

16 Temperature probe

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Connecting the terminal

7 Plug the probe (8) on the measuring module into the respective socket (12 or 13).

8 If necessary, insert the plug for the temperature probe of the electrode into the socket (16).

9 Prepare the beaker with the test solution (7).

10 Adjust the height of the probe holder (9) by pressing the locking key (10) so that the probe is immersed in the test solution.

11 For pH, ORP or ISE electrodes with a separate reference electrode:Plug the reference electrode into the socket (15).

12 Place the probe cable (11) into the cable shaft (3) so that it is stored safely.

13 Plug the connecting cable to the terminal (AK M-T) into the socket (17).

14 Place the terminal on a flat surface near the measuring module and protect it from intense light and heat.

15 Plug the connecting cable from the measuring module to the terminal (AK M-T) into the socket (18).

17

18

19

20

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System upgrades

Connecting theplug-in power supply

The plug-in power supply unit supplies the terminal and the measuring module with low voltage.

WarningThe line voltage on site must lie within the input voltage range of the original plug-in power supply unit. Use original plug-in power supplies only (see chapter 15 TECHNICAL DATA).

16 Plug the external temperature probes into the sockets (15 and 16).

17 Plug the StirrOx G oxygen probe with integrated stirrer into socket (14).

18 Plug external printer/PC or recorder into socket (19).

19 Connect the external PC keyboard or barcode reader via the adapter cable AK T-K PS2 to socket (20).

20 Attach the rubber sleeve (6) onto the measuring module.

21

22

2324

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1 Insert the plug (22) into the socket (21) of the terminal.

2 Fit the country-specific adapter (23) onto the plug-in power supply (24).

3 Plug in the original WTW plug-in power supply (24) to an easily accessible wall socket.The system is in the standby mode. The display shows the date and time.

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3.3 Switching on the measuring system

After the plug-in power supply unit is connected and the initializing period is over, the measuring system switches to standby mode (Standby and the date and time are displayed).

1 Place the terminal and measuring module on a flat surface and protect them from intense light and heat.

2 Press the e key or [Online] on the terminal.The measuring module and probe are initialized.

3 As soon as the measuring module and probe have been initialized, a selection of user names is displayed.

4 Select a user name with 82.Anonymous Login without passwordAdmin Login with password

5 Confirm the user profile with OK.

6 If necessary, enter the password with 82 and 46 and start the login with [OK].

7 As soon as the measuring module and probe are initialized, a measured value appears on the display, e.g. the pH value.

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3.4 Settings

To obtain the best results and to make use of the entire range of functions of the inoLab 740 measuring system, the measuring system must be configured and calibrated.

You can adapt the configuration to your measuring environment and your requirements via system settings and probe-dependent settings.

System settings The system settings include the following settings:

Date and time (chapter 5 SYSTEM SETTINGS)

Display options (chapter 5 SYSTEM SETTINGS)

Language selection(chapter 5 SYSTEM SETTINGS)

Data storage settings (chapter 11 DATA STORAGE)

Printer settings (chapter 12 DATA OUTPUT)

Temperature unit (section 5.5.1 TEMPERATURE UNIT)

Probe-dependentsettings

Probe-dependent settings include, e.g.:

Selection of the measuring range

Selection of the display of various measured variables

More detailed information is given in the descriptions of the individual measured quantities in the section SETTINGS (chapter 6 to chapter 10).

Calibration More detailed information is given in the descriptions of the individual measured quantities in the section CALIBRATION (chapter 6 to chapter 10).

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3.5 Updating the terminal software (firmware)

The program "Firmware Update inoLab Terminal 740 Vx.x" is used to update the firmware of the inoLab 740 terminal. The newest firmware version can be downloaded from the Internet under www.wtw.com.

Prerequisites:

PC with Windows 95, 98, or NT operating system

Minimum of 2 MB free storage

A free (serial) COM-interface

Interface cable, AK T-PC (see section 3.1 SCOPE OF DELIVERY)

NoteThe update takes approx. 20 min.

3.5.1 Checking the version no. of the terminal firmware

1 Swap to offline mode with [Offline].

2 Swap to the menu with [Menu].

3 Select the Opt menu with 46.

4 Confirm the Opt menu with g.

5 Select the Setup menu with 82.

6 Confirm the Setup menu with g.

7 Select the Info... menu with 82.

8 Confirm the Info... menu with g.The Info window opens. The version number of the firmware appears next to Terminal : here "1.2".

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3.5.2 Starting the update of the terminal firmware

1 Unplug the plug-in power supply and measuring module (active multifunction box) from the inoLab 740 terminal.

2 Download the installation program for the firmware update, e.g. from the Internet.

3 Start the installation program for the firmware update. The program creates an entry in the Windows start bar (in the standard installation under Start / Programme / Firmware Update inoLab Terminal V x.x..)

4 Start the update program. The Terminal Programming window opens and displays instructions for the update.

5 Select the required language for the installation program in the Language menu.

6 Change the COM interface displayed in the V24Parameter menu if necessary.

7 Plug the AK T-PC serial cable into the "RS232/REC" socket (19) on the terminal and connect with the interface (COM 1 ... 4) of the PC selected in the V24Parameter menu.

8 Plug the power supply into the inoLab 740 terminal again.The Standby display appears.

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9 Press g and hold it down.

10 Press [Offline].

11 Release both keys.The Terminal Programming window shows the current status of the update (in %).

12 Wait for display to reach 100%. The firmware update has been carried out.

13 Briefly unplug the inoLab 740 terminal from the supply voltage and plug it again.The Standby display appears. The instrument is ready for operation.

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inoLab 740 Basic principles of operation

4 Basic principles of operation

This section provides basic information on the operation of the measuring system and the display of the measured values.

The terminal has two operating modes:

Display modeThe display shows the current measured value.Change to the Menu mode using the [menu] softkey.

Menu modeThe display shows open menus and submenus. For example, you can operate or set up the following functions here:- measuring functions- calibration functions- memory functions- printer/interface functions- general and system settings

Return to the Display mode by pressing m or by pressing the [ESC] softkey several times.

The inoLab 740 measuring system is operated via the terminal. The AutoRead function and starting a measurement with AutoRead can also be operated from the measuring module.

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Basic principles of operation inoLab 740

4.1 Display

The display shows measured values, active functions/settings, available softkey functions and a selection of measuring and display settings in the menu.

Below the display there are three softkeys to perform the displayed softkey functions.

4.1.1 Status display indicators

Status display indicators show active functions/settings.

h The AutoRead function is active

h flashes A measurement with AutoRead is active

i AutoRange is active

jd Automatic pH calibration with standard buffer solutions, prepared according to DIN 19267, is active

jt Automatic pH calibration with technical buffer solutions is active

B Conventional pH calibration with buffer solutions is active

L Calibration of the conductivity set

x Calibration of an oxygen measuring set

U Calibration of the ion-sensitive measuring system

v Temperature probe is being used

z pH measurement only:Integrated temperature probe of a conductivity measuring cell is being used

y pH measurement only:Integrated temperature probe of a D. O. probe is being used

Menu

Status display indicators

Measured variable, measured value, measured temperature value, temperature probe

Softkey functions

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k D. O. measurement only:The salt content is taken into consideration.The salt content refers to the salinity according to the IOT table

n Conductivity measurement only:Temperature compensation "nLF" is active

q Conductivity measurement only:Temperature compensation "lin" is active

7 Conductivity measurement only:No temperature compensation "TC off"

3 Only when the StirrOxG D. O. probe with integrated stirrer is connected:Operating with the integrated stirrer

1 Only when the StirrOxG D. O. probe with integrated stirrer is connected:Displays an error on the socket of the stirrer (see also section 14.5)

0 Conductivity measurement only:TRef = 20 °C is selected as the reference temperature

5 Conductivity measurement only:TRef = 25 °C is selected as the reference temperature

+ With ion selective measurements only:Reference measurement active

- With ion selective measurements only:Blank value correction active

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4.1.2 Softkey functions

The currently available softkey functions are displayed above the corresponding softkeys.Softkeys are displayed in italics and in square brackets, e.g. [Menu].

p Prints the current display contents(right-hand softkey only)

[Menu] Switches to the Menumode (left-hand softkey only)

[ESC] Switches to the next higher menu level in the Menu mode, or quits the Menu mode (left-hand softkey only)

[Tab] Swaps between different displays that are open at the same time (e.g. graphical display - numerical measured value)

[Next] Switches between the different input fields in an input window

[Ident] To input the ID of a measured value

[RCL menu] Opens a selection menu for stored measured values

[Open] Opens a storage for input/output

[Start] Starts a measurement

[Ok] Completes the entries

[X] Deletes the selected entry

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4.1.3 Symbols in the Menu mode

White scripton a black

background

Black scripton a white

background

Tick✔

Arrow

Dots...

White script: (example: Baud rate 1200)Function/setting selected

Black script: (example: Baud rate 2400)Selectable function/setting;the function/setting can be selected by pressing 82

Tick ✔ (example: Baud rate 4800 )Active (✔) setting

Arrow (example: Setup)After selecting and confirming by pressing g, a submenu with more functions/settings opens.

Dots...(Example Cal Prot. ...) exists for this menu item:

A display with input field(s) (e.g. to enter the calibration interval), or

A special display (e. g. calibration records)

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4.1.4 Display of measured values

The display shows measured values clearly by:

Detailed display of a measured value

Simultaneous display of two measured values

Graphical representation of the course of a series of measurements

Digital recorder display

Display of a measuredvalue

Example: Display of the pH value.

Display of twomeasured values

(multiparametermeasuring instruments)

Example: Simultaneous display of pH and measured oxygen value.

The solid frame indicates the active measured value to which the active menu, submenu, functions and settings refer.

You can alternately activate the measured value displayed on the left or on the right with [Tab].

[Tab]

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Graphicaldisplay

Example: Graphical display of a pH graph.

Measurement datasets that you have stored with the AutoStore function (see section 11.1.2) can be displayed in the form of a graph. Sections of the graph can be zoomed. You can print out the current display.

Digital recorder display Example: Digital recorder for measurement of the pH value.

The digital recorder, like an analog recorder, records the current measured values continuously. The measured values are displayed graphically and numerically.

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4.2 Keys

The inoLab 740 measuring system has a keypad on the terminal and one on the measuring module. The two keys mentioned below are located both on the terminal and on the measuring module:

a key to activate the AutoRead function

g key to start a measurement with AutoRead. An LED indicates whether the AutoRead function is active.

If the measuring system is in the Display mode, the functions of the two keys on the terminal and on the measuring module are identical.

In addition, you can also plug an IBM PC keyboard into the terminal.

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4.2.1 Keys on the terminal

1 Three softkeys (display-dependent function keys).The currently available function of the key appears on the display above the key.

2 Switches from the Menu to the Display mode or selects a measured variable

3 Starts a calibration procedure

4 Print LED (only on the terminal with integrated printer)red: printer off (offline) or malfunctiongreen: printer ready for operation (online)

5 Switches the printer on/off (only on the terminal with integrated printer)

6 Paper feed/line feed(only on the terminal with integrated printer)

7 Increases or reduces values; Selects functions/settings in the Menu mode

8 Makes a selection in the Menu mode and confirms inputs in input fields

9 Saves a measured value manually

10 Activates/deactivates the AutoRead function

11 Switches the measuring system on/off

12 Displays/transmits measured values

1

2

3

4

5

6

1

7

8

910

11

12

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4.2.2 Keys on the measuring module

13 Status indicator of the AutoRead functionLED off: AutoRead function is deactivatedLED lights up: AutoRead function is activatedLED flashes: AutoRead measurement has been started

14 Starts the AutoRead measurement (if the AutoRead function is activated)

15 Activates/deactivates the AutoRead function

AR

RUNENTER

13

14

15

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4.2.3 IBM PC keyboard

You can also operate the measuring system via an external keyboard. This enables the input of letters, e.g. for assigning names as identification (ID).

The keys on the terminal are positioned to correspond to the keys on the function block of an IBM PC keyboard.

In addition, the following keys of the PC keyboard have been allocated to the following functions on the terminal:

NoteTo connect a PC keyboard to the terminal, you require the adapter cable AK T-K PS2.

Switching the integrated printer on or off is only possible via the o key on the terminal (not via the PC keyboard).

PC keyboard Terminal

Enter g

Tab Softkey [TAB]

Esc Softkey [ESC]

Keyboard on the terminal Keys of an IBM PC keyboard

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4.2.4 Barcode reader

The entry of letters, e.g. for assignment of names as identification (ID) is also possible with a barcode reader.

To connect a barcode reader to the terminal, you require the adapter cable AK T-K PS2.

4.3 Menu

The main menu line of the display contains four main menus.

The main Meas. menu contains the settings for measuring with the connected measuring module and sensor.

The main Cal menu contains the settings for calibrating the connected measuring module and probe.

The main Mem menu contains functions to store and display measured values and system configurations.

The main Opt menu contains general settings, e.g. for the temperature unit or time, and configurations of the terminal, e.g. of the display.

Calling up the menu 1 Switch on the measuring system (see section 3.3).The display mode is active. The display shows a measured value (e.g. pH value).The [Menu] and p softkeys are available.

2 Change to the Menu mode with [Menu] .The last main menu used, e.g. Opt, is opened and the last menu item used, e.g. Setup, is selected. The [ESC] softkey is available.

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Using a menu

Quitting a menu

How to operate the menu is explained in detail in the following example.

A submenu with further settings is available

Selectable function

Active (✔) function

Action Key

Switch to the next higher menu Press [ESC]

Select a different main menu Press 46

Confirm the selected menu item Press g

Select another menu item Press 82

Action Key

Switch to the next higher menu Press [ESC]

Switch to the Display mode Press m

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Example Setting the temperature unit

Starting point: pH measurement in the Display mode

1 Change to the Menu mode with [Menu] .

2 Use 46 to select the main Opt menu.

3 Select the Setup menu item with 82.

4 Confirm the Setup menu item with g.

5 Select the Temp Unit menu item with 82.

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6 Confirm the Temp Unit menu item with g.

7 Using 82, confirm the Celsius or Fahren setting.

8 Confirm the selected temperature unit with g.The selected temperature unit is active (✔).

9 Terminate the Menu mode with m.The temperature unit is shown on the display.

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4.4 Output of measured data

You can display measured values on the display graphically and numerically, and output them to a printer, an analog recorder, or a PC.

4.4.1 Measured data display on the screen

Sample display Representation

Numerical display

Display of the current measured value and the measured temperature value.

Graphical display

Display of the measured data records stored with AutoStore in the form of graphs. The graph can be output to a printer (see chapter 12 DATA OUTPUT).

Numerical display

Display of the measured data records stored with AutoStore in the form of lists. The values can be output to a printer (see chapter 12 DATA OUTPUT).

Digital recorder

The digital recorder shows the current measured values in the form of a graph on the display (and the internal printer) .

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4.4.2 Measured data output on the integrated printer

On a terminal with integrated printer, you can output all displays directly to the internal printer.In order to print measured data records, it is necessary to configure the printer. The detailed settings of the menu can be found in chapter 12 DATA OUTPUT.

If the internal printer is switched on, start the output of individual measured data records with the p softkey. Printing data from the memory is started via Print functions in the menu.If the digital recorder is on, the course of the measurement is shown as a graph on the display. Simultaneously, you can output the graphical display on the integrated printer.

4.4.3 Outputting measured data to the RS232/REC interface

Via the RS 232 interface, you can output numerical measuring data to an external printer, an analog recorder or a PC.

NoteIf you output the data to a PC, you can easily transfer the data to a database (see section 12.3.5).

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inoLab 740 System settings

5 System settings

5.1 Date and time

A real-time clock is integrated in the system. The date and time appear both on the display and in printouts. The clock is buffered against power failures by two batteries (for information on how to change the batteries, see section 13.1 MAINTENANCE).

1 Switch to the Menu mode.

2 Select the main Opt menu with 46.



5 Select the Time... menu item with 82.

6 Confirm the Time... menu item with g.The Date/Time window appears on the display.The input field for hours is marked in the Time line.

7 Option:Switch between the individual digits with 46.

8 Increase or decrease the number with 82.

9 Press [Next] to change to the next input field (hour - minute - day - month - year).

10 Complete the input of time and date.

11 Terminate the Menu mode with [ESC].

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System settings inoLab 740

5.2 Changing the language





5 Select the Language menu item with 82.

6 Confirm the Language menu item with g.

7 Select the English or German language with 82.

8 Confirm the language selection with g.The language is activated (✔).

9 Terminate the Menu mode with m.

10 Switch off the terminal with o.

11 Switch on the terminal again with o.Display texts appear in the selected language.

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5.3 Display settings

To adjust the quality of the display to the ambient light, you can adjust the contrast of the display in 10 steps and switch on a background display illumination if necessary.

5.3.1 Display contrast

Setting the displaycontrast





5 Select the Display menu item with 82.

6 Confirm the Display menu item with g.

7 Select the Contrast... menu item with 82.

8 Confirm the Contrast... menu item with g.The Display Contrast input window appears on the display. The input field Input: 0-9 is selected.

9 Increase or decrease the number to the required contrast with 82.

10 Confirm the input with g.The display contrast has been set up.

11 Terminate the input with [ESC].The Menu mode is terminated.

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5.3.2 Display illumination

Switching the displayillumination on/off





5 Select the Display menu item with 82.

6 Confirm the Display menu item with g.

7 Select the BckLight menu item with 82.

8 Confirm the BckLight menu item with g.The display illumination is switched on (✔).

9 To switch off the display illumination:Confirm the BckLight menu item with g.The display illumination is off.The ✔ symbol behind BckLight disappears.


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5.4 Acoustic signals

You can select which events are to trigger an acoustic signal:

Warning messages (Signal)

When measuring range limits are exceeded (Limit)

Each time a key with no function is pressed (no func)

You can select several options at the same time.

Selecting acousticsignals





5 Select the Signal menu item with 82.

6 Confirm the Signal menu item with g.

7 Select the Signal, Limit or no func menu item with 82.

8 Confirm the selected menu item with g. The selected acoustic signal is active (✔).

9 Option:Activate further acoustic signals (✔).

10 Leave the Menu mode with [ESC].

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5.5 Temperature

The temperature is very important for the reproducibility of measured values. You can select the unit of the temperature display. The temperature is determined automatically via an external temperature probe or a temperature probe integrated in the probe. It is also possible to enter measured temperature values manually.

5.5.1 Temperature unit

You can display temperature values in °C (degrees Celsius) or °F (degrees Fahrenheit).





5 Select the Temp Unit menu item with 82.

6 Confirm the Temp Unit menu item with g.

7 Use 82 to select the required temperature unit Celsius or Fahren. menu item with 82.

8 Confirm the selected menu item with g. The selected temperature unit is active (✔).


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5.5.2 Measuring the temperature

For reproducible measurements, it is imperative to determine the respective temperature values. The measuring system obtains the temperature value from:

a temperature sensor integrated in the sensor,

a temperature sensor integrated in another sensor (applies to the modules, pH/Oxi, pH/Cond, Multi),

an external NTC30 or Pt1000 temperature sensor (Pt1000 for the pH and Cond modules only), or

by entering a measured temperature value manually.

The temperature probe that is used is indicated on the display by v, y, or z.

Using the temperatureprobe integrated in the

probe

When you use probes with an integrated temperature probe, the measured parameter and temperature are always measured simultaneously. If the integrated temperature probe is identified, the measured temperature value and the status v appears on the display.

Using the temperatureprobe of another probe

(multi-parametermeasuring instruments)

If no temperature probe is available for pH/ISE measurements, the temperature can be measured by the integrated temperature probe of another probe (oxygen probe or conductivity measuring cell). To do so, proceed as follows:

1 Immerse the D. O. probe or conductivity measuring cell into the test sample.


3 Select the main Meas menu with 46.

4 Select the pH setup menu item with 82.

5 Confirm the pH setup menu item with g.

6 Select the O2/Cond TP menu item with 82.

7 Confirm the O2/Cond TP menu item with g.The temperature measurement is active (✔).

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Using an externaltemperature probe

If you want to measure the temperature using an external temperature probe, proceed as follows:

Entering thetemperature value

manually

If you want to enter the temperature manually instead of measuring it automatically, proceed as follows:

8 Terminate the Menu mode with m.y or z appears on the display so you can check your setting.

1 Connect the temperature probe to the measuring module.

2 Immerse the temperature probe in the test sample.The measured temperature value is displayed.

1 Measure the current temperature of the test sample.

2 Call up the Display mode with m.

3 Call up the pH measured variable with 46.

4 Call up the entry field for the temperature value with 82.


6 Set up the temperature value with 82.

7 Confirm the temperature value with g.

8 Terminate the input with [ESC].The display shows the temperature value that was selected.

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5.6 User profiles

All documented measurement or calibration data are output together with the user name of the provider. User profiles contain the user name and the authorization assigned to the user.

The administration of user profiles is only possible if a user logs in with the user name, Admin.

Name Access Authorization

Admin protected by a password

to measure all measured variablesto calibrate all measured variablesto change all settingsto save all settingsto enable/disable the login with the user name, Anonymousto set up/delete user profiles

Anon-ymous

free to measure all measured variablesto calibrate all measured variablesto change all settingsto save all settings

Self-created user profiles

protected by a password

Setting: none to measure all measured variablesto calibrate all measured variablesto change all settingsto save all settings

Setting: 1 ... 4 to measure one measured variableto calibrate one measured variableto change the setting of one measured variable.

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NoteThe user name Anonymous provides rapid access to the inoLab 740 measuring system without having to enter a password.

The administrator can disable or enable this access (see section 5.6.3).

The password "0001" is the default setting for the user name Admin when the instrument is delivered.

The administrator (login with the user name Admin) administrates user names and authorizations (see section 5.6.3):

enabling/disabling the login with the user name, Anonymous

creating a user profile

changing a user profile

deleting a user profile

printing out the list of user profiles

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5.6.1 Opening the Administration menu

5.6.2 Opening the Administration window

1 Swap to standby mode with e.

2 Swap to offline mode with [Offline].

3 Select the user name Admin with 82.

4 Confirm the user name with [OK].

5 Input the password for the user name with 82 and 46.

6 Confirm the password with [OK].Access to the settings in the offline mode is opened.

7 Switch to the menu mode with Menu.

8 Select the Opt menu with 46.

9 Select the User menu item with 82.

10 Confirm the User menu item with g.

1 Open the User menu (see section 5.6.1).

2 Select the Administration menu item with 82.

3 Confirm the Administration menu item with [OK].

The Administration window opens.

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5.6.3 Creating, editing, or deleting a user profile

Enabling/disabling theuser profile,Anonymous

Creating a user profile

NoteIf no setting with the selected number is yet stored, a message appears when the user profile is stored. Save a setting (see section 11.2).

It is not possible to log in with a user name without a valid setting.

Changing a user profile

1 Open the Administration window (see section 5.6.2).

2 Select the user name Anonymous with 82.

3 Select the user name Anonymous with [OK].

A prompt appears for changing the present setting.

4 Select Yes with [Next].

5 Confirm the change with g.

The OFF status appears in the field next to Anonymous in the Administration window.

The login with the user name Anonymous is disabled.


2 Select the ??? entry with 82.

3 Confirm the ??? entry with [OK].

A dialog for the input of a new user profile opens.

4 Enter a user name.

5 Swap to the Setting field with [Next].

6 Select one of the settings None or 1 ... 4 with 82.

7 Confirm the Name and Setting with [OK].

The new user profile appears in the Administration window.


2 Select a user name with 82.

3 Confirm the user name with [OK].

A dialog opens for changing the Name or Setting of the user profile.

4 Swap to the Setting field with [Next].

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Deleting a user profile

5.6.4 Printing the list of user profiles

The administrator (login with the user name, Admin) can print out a list of current user profiles or all user profiles.

The list of current user profiles (Current) contains the user profiles which can be used for login.

The list of all user profiles (Complete) contains all current and all deleted user profiles, which have been used for at least one login.

NoteA consecutive number for each user profile is also assigned internally.

5 Select one of the settings 1 ... 4 with 82.

6 Confirm the Name and Setting with [OK].

The changed user profile appears in the Administration window.



3 Delete the user profile with [X].

A security prompt opens for deleting the user profile.


5 Confirm the deletion with g.

The user name is deleted from the list of user names in the Administration window.

1 Open the User menu (see section 5.6.1).

2 Select the Print menu item with 82.

3 Confirm the Print menu item with [OK].

The list of user profiles is printed.

4 Use 82 to select the Current or Complete menu item.

5 Confirm the selection with [OK].

The list of user profiles is printed.

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5.7 Password for user names

The login with the user name Admin and all self-created user names is protected by a password.

Each terminal is delivered with the password "0001" for the user name, Admin. Change this password as soon as possible.

5.7.1 Changing the password

The password has 4 numerical digits. The password "0000" is not allowed.

1 Swap to standby mode.

2 Swap to the selection of the user name with [Online] or [Offline].


4 Confirm the selection of the user name with [OK].

The dialog for the password input opens.

5 Swap to the Change current field with [Next].

6 Input the current password with 82 and 46.

7 Swap to the Change new field with [Next].

8 Input a new four-digit password with 82 and 46.

9 Confirm the new password with [OK].

The display swaps to the online or offline display. The password is changed.

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5.7.2 Assigning a password

As long as no login has yet been made with a new user name, this user name is displayed in brackets in the list of user names. The user specifies the password when he first logs in with the new user name.

NoteNo access to this user profile is possible without this password.

NoteThe password has 4 numerical digits. The password "0000" is not allowed.

5.7.3 Forgotten the password?

Self-createduser profile

It is not possible to log in with this user name without a password.

The administrator can delete and recreate the user profile (see section 5.6.3).

Admin In emergencies, it is also possible to log in with the user name Admin using a special enabling code obtained from WTW GmbH.

The address and telephone number of WTW GmbH is given on the cover page of this operating manual.

1 Swap to standby mode.

2 Swap to the selection of the user name with [Online] or [Offline].

3 Select the new user name (name in brackets) with 82.

4 Confirm the selection of the user name with [OK].

The dialog for the password input opens.

5 Input a four-digit password with 82 and 46.

6 Confirm the password with g.

The display swaps to the online or offline display.

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5.8 Modules

The calibration data can only be assigned to a user name if the calibration data were recorded with the current combination of terminal and module.

As a result of the registration of the modules, the terminal recognizes whether the calibration data were stored in the module with this or another terminal.

The registration of a module to a terminal is made automatically in the first calibration of a module at a terminal.

If a module is registered at a terminal, the user name with which the calibration was performed appears on the display during the prompt of a calibration protocol, and the module appears in the Registered modules list. This list contains all registered modules with the module type and serial number.

If a module is not registered at a terminal, a note together with unknown as the user name appears on the display during the prompt of a calibration protocol.

NoteThe maximum number of registered modules is 16. Further modules are not registered. Calibrations are nevertheless possible. Anonymous appears as the user name.

Viewing, printing out and editing the list of Registered modules is only possible during login with the user name Admin.

1 Open the Administration menu (see section 5.6.1).

2 Select the Module menu item with 82.

3 Confirm the Module menu item with [OK].

The Module register window opens.

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Deleting a module

or

Print out the list ofregistered modules

4 Select a Module menu item with 82.

5 Delete the selected Module with [X]

6 Print out the list of Modules with [PRINT].

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6 pH

Measuring modules for the inoLab 740: pH, pH/ION, pH/Cond and Multi.

6.1 Settings for pH

We recommend checking the current settings and correcting them if necessary before a measurement.

6.1.1 Displaying pH/ISE or measured voltage values

For pH measurements, the inoLab 740 enables rapid switching between the display of the pH value (pH) and the voltage (U).

6.1.2 Setting the pH display

pH electrodes are connected to the same connector on the measuring module. The selection of the measured variable ISE or pH is made in the main Meas menu. The active pH or ISE setting is marked with ✔.

Measured variable, pH

1 Activate the Display mode.

2 Switch to the display of the pH value with m.

3 Switch between the measured value display of the pH value (pH) and voltage (U) with 46.


2 Use 46 to select the main Meas menu.

3 Select the pH menu item with 82.

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6.1.3 Measured value resolution of voltage display

Using the U-AutoRng function, you can select the resolution of the voltage measurement:

If U-AutoRng is not active, voltages in the range of -1999 to +1999 mV are measured with a resolution of 1 mV.

If U-AutoRng is active, voltages in the range of +999.9 mV to -999.9 mV are measured with a resolution of 0.1 mV. The rest of the measuring range remains unchanged.

NoteIf you expect voltages outside the range +999.9 mV to -999.9 mV and want to connect a recorder, deactivate U-AutoRange. Otherwise, the recorder scaling at the range limits will change.

Measured valueresolution,

U

4 Confirm the pH menu item with g.The pH display is active (✔).

5 Terminate the Menu mode with m.The pH value appears on the display.





5 Select the U-AutoRng menu item with 82.

6 Confirm the U-AutoRng menu item with g.The U-AutoRng function is active (✔).Voltages in the range between -999.9 and +999.9 are displayed with a resolution of 0.1 mV.


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6.1.4 Measured value resolution of pH display

You can select the resolution for the pH value:

If the high resolution (pH high resol. ✔) is switched on, measurement is carried out over the entire pH range with a resolution of 0.001.

If the high resolution (pH high resol.) is switched off, measurement is carried out over the entire pH range with a resolution of 0.01.

Measured valueresolution, pH





5 Select the pH high resol. menu item with 82.

6 Confirm the pH high resol. menu item with ❇.The 0.001 resolution is active (✔).


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6.1.5 Resetting to default settings

You can reset (initialize) the settings for the pH measurement to the default settings.

In a reset, the following functions for the pH measurement are reset to the default settings:

pH reset With the reset pH function, all the settings for pH measurements are reset to the default values.

Measuring mode pH

Asymmetry UAsy in mV 0 mV

Slope S (k) in mV -59.16 mV

Calibration procedures AutoCal TEC

Temperature, manual 25 °C


2 Use 46 to select the main Cal menu.

3 Select the Reset pH menu item with 82.

4 Confirm the selected menu item with g.The default settings for pH measurements have been restored. The Menu mode is terminated.

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6.2 Calibrating pH measurements

Why calibrate? pH electrodes age. This changes the asymmetry and slope of the pH electrode. This may cause the measuring system to ignore the limits of a calibrated system. Calibration determines the current values of the asymmetry and slope and stores them in the measuring module. Calibration must be performed at regular intervals.

When to calibrate? After connecting another electrode

When the sensor symbol flashes:

– after expiry of the calibration interval

– after a voltage interruption, e.g. battery change

You can choose between two calibration procedures: AutoCal and ConCal:

AutoCal is a fully automatic calibration using the datasets selected for buffer solutions in the pH buffer menu. The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see page 74), the instrument displays the relevant buffer nominal value or the current electrode voltage in mV. The calibration can be terminated after the first buffer solution. This corresponds to a single-point calibration.

ConCal is the conventional two-point calibration method using two buffer solutions (pH 7.0 ± 0.5 and any other buffer solution) or a single-point calibration using any buffer solution that is used as a high-speed method.

AutoRead When calibrating with AutoCal, the AutoRead function is automatically activated. The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing g.

Calibration record The calibration record contains the calibration data of the current calibration. You can call up the calibration record by outputting the data storage (section 11.3).

NoteYou can automatically print a calibration record following calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed.

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pH inoLab 740

Sample printout:

Calibration evaluation After the calibration, the measuring module automatically evaluates the current status of the system. The asymmetry and slope are evaluated separately. The displayed probe symbol shows the worse-case evaluation of both variables..

pH calibrationCal Date: 05.12.1999Cal Time: 22:46Cal Interval: 7 daysAutoCal TEC Tman ARBuffer 1 2.00Buffer 2 4.01Buffer 3 7.00Buffer 4 10.01C1 290.6 mV 25°CC1 174.5 mV 25°CC1 0.2 mV 25°CC1 -174.6 mV 25°CS -58.2mV/pHASY 0 mVSensor +++User: xxxxxx

Display Asymmetry[mV]

Slope [mV/pH]

-15 ... +15 -60.5 ... -58

-20 ... +20 -58 ... -57

-25 ... +25 -61 ... -60.5 or -57 ... -56

Clean the electrode according to the electrode operating manual

-30 ... +30 -62 ... -61 or -56 ... -50

E3

Eliminate the error according to chapter 14 WHAT TO DO IF...

< -30 or > 30

... -62 or

... -50

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6.2.1 Buffer sets

Before each calibration, it is necessary to inspect the selected calibration procedure and the buffer sets used. You can use the following buffer sets at the specified temperatures for an automatic calibration.*

* The calibration for pH 10.01 is optimized for the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the WTW catalog or in the Internet.

Buffer setMenu designation

pH values

at temp

WTW technical buffer solutions Buffer TEC 2.004.017.0010.01*

25 °C

Standard buffer solutions according to DIN19266

Buffer DIN 1.6794.0066.8659.18012.454

25 °C

Merck companyTitrisole buffers and buffer solutions

Riedel de Haen companyFixanale buffers and buffer solutions

Buffer Mrk1 2.004.007.009.0012.00

20 °C

Merck companyTitrisole buffers and buffer solutions

Riedel de Haen company Fixanale buffersand buffer solutions

Buffer Mrk2 1.003.006.008.0010.0013.00

20 °C

Merck company ready-made buffersolutions

Buffer Mrk3 4.666.889.22

20 °C

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pH inoLab 740

6.2.2 Calibration settings

Selecting the calibrationprocedure

The following calibration procedures can be selected:

AutoCal

– AutoCal [mV]displays the current electrode voltage in mV during calibration

– AutoCal [pH]displays the respective nominal buffer value during calibration

ConCal

Selecting the buffer datarecord

For each calibration procedure, you can select between the buffer datasets TEC, DIN and Mrk:



3 Select the pH caltype menu item with 82.

4 Confirm the pH caltype menu item with g.

5 Use 82 to select the AutoCal, AutoCal [pH] or ConCal menu item.

6 Confirm the selected menu item with g.The selected calibration procedure is active (✔).

7 Select the pH Buffer menu item with 82.

8 Confirm the pH Buffer menu item with g.

9 Select the Buffer TEC, Buffer DIN or Buffer Mrk 1...3 menu item with 82.

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Calibration interval The calibration interval determines the time interval between regular system calibrations. The terminal reminds you to calibrate regularly by the flashing probe symbol on the display.

The calibration interval is set to 7 days in the factory. You can change the interval (1-999 days).For most applications, we recommend a shorter calibration interval.

10 Confirm the selected buffer data record with g. The selected setting is active (✔).




3 Use 82 to select the Cal Int. ... menu item.

4 Use g to confirm the Cal Int. ... menu item.The Calibration interval entry window appears.


6 Increase or reduce the value with 82.

7 Confirm the value for the calibration interval with g.

8 Use [ESC] to terminate the Menu mode.

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pH inoLab 740

Selecting the unit for theslope

The slope determined during calibration can be displayed in the unit, mV/pH or %. The display in % refers to the Nernst slope, 59.2 mV/pH (100 x the slope determined/Nernst slope).



3 Use 82 to select the pH Caltyp menu item.

4 Use g to confirm the pH Caltyp menu item.

5 Use 82 to select the Slo[%] menu item.

6 Use g to confirm the Stg[%] menu item.The display of the slope in % is active (✔).

7 Use m to terminate the Menu mode.

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6.2.3 Calibration

Preparatory activities

NoteDuring calibration without a temperature probe, set the current temperature of the respective buffer solution manually (see section 5.5.1). If you use a temperature probe, it is not necessary to enter the temperature manually.

AutoCalcalibration

For the AutoCal procedure, use buffer solutions according to the buffer table (see section 6.2.1).

During calibration, the display shows both the calibration procedure and the number of the next buffer solution before a new buffer solution is used.The display, e.g. ct1 here, has the following meaning:

The following example covers the autocalibration procedure using WTW technical buffer solutions. If you use other buffer solutions, e. g. DIN buffers or buffer solutions of the Merck company, the displays before using the next buffer will be different.

NoteDuring calibration, always use the pH buffer solutions in ascending order.

1 Use m and/or 46 to display the pH value.

2 Connect the pH electrode to the measuring module.

3 Keep the buffer solutions ready (up to 5 solutions, depending on the selected calibration procedure).

4 Adjust the temperature of the solutions and measure the temperature if measurement is made without a temperature probe.

c:The calibration has been started.

t: Selected buffer datasett = Technical buffer ord = DIN buffer orm = Merck bufferPossible values: t, d, m

1: No. of the next buffer solution1 = 1st buffer solution 2 = 2nd buffer solution 3 = ..., etc.Possible values: 1 ... 5

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pH inoLab 740

1 Select the AutoCal calibration procedure (see section 6.2.2).

2 Select the buffer data record (see section 6.2.1).

3 Perform the preparatory activities (see section 6.2.3).

4 Start the calibration procedure with c.ct1 appears on the display.

5 If necessary, set the temperature of the first buffer solution with 82 (see section 5.5.2).

6 Immerse the electrode and the temperature probe in the first buffer solution.

7 Start the measurement with g.The h display indicator flashes. The electrode voltage (U in mV) appears on the display. As soon as a stable value is reached, the display h no longer flashes. ct2 appears on the display.

8 Thoroughly rinse the electrode with deionized water.

9 If necessary, set the temperature of the second buffer solution with 82 (see section 5.5.1).

10 Immerse the electrode and the temperature probe in the second buffer solution.

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Three-pointcalibration

11 Start the measurement with g.The h display indicator flashes. The electrode voltage (mV) appears on the display. As soon as a stable value is reached, h disappears. The slope value (mV/pH) and the asymmetry value (mV) appear on the display. The probe symbol shows the calibration evaluation after the two-point calibration.

12 Use g to go on to the three-point calibration (ct3 appears on the display) or terminate after the two-point calibration with m(the current calibration data are stored).


14 If necessary, set the temperature of the third buffer solution with 82 (see section 5.5.1).

15 Immerse the electrode and the temperature probe in the third buffer solution.

16 Press the g key.The h display indicator flashes. The electrode voltage (mV) appears on the display. As soon as a stable value is reached, h disappears. The probe symbol shows the calibration evaluation after the three-point calibration. The value of the slope S (in mV/pH) and the value of the asymmetry (in mV) appear on the display.

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pH inoLab 740

Four-pointcalibration

17 Use g to go on to the four-point calibration (ct4 appears on the display) or terminate after the three-point calibration with m(the current calibration data are stored).


19 If necessary, set the temperature of the fourth buffer solution with 82 (see section 5.5.1).

20 Immerse the electrode and the temperature probe in the fourth buffer solution.

21 Press the g key.The h display indicator flashes. The electrode voltage (mV) appears on the display. As soon as a stable value is reached, h disappears. The probe symbol shows the calibration evaluation after the four-point calibration. The value of the slope S (in mV/pH) and the value of the asymmetry UAsy (in mV) appear on the display.

22 Press the g key.The pH value and the probe symbol appear on the display.

The system is calibrated for pH measurements.

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NoteThe calibration line is determined by linear regression.After the calibration is finished, the calibration record is automatically printed if the printer is ready for operation. Information on setting up a printer and on the printout of further calibration protocols is given in chapter 12 DATA OUTPUT and section 12.2.4 PRINTING.

ConCalsingle-point calibration

Only one buffer solution is required for single-point calibration. The pH value should lie as close as possible to the expected measured value. Only the electrode asymmetry is then newly determined. The slope of the last two-point calibration is retained.

ConCaltwo-point calibration

Use the following buffer solutions:

pH 7.0 ± 0.5

Any other buffer solution so that the measuring range is covered as well as possible

NoteThe ConCal calibration procedure has no temperature compensation. The buffer solutions must have the correct temperature.

If you use a temperature probe, it is not necessary to enter the temperature manually.

1 Select the ConCal calibration procedure (section 6.2.1).

2 Perform the preparatory activities (see section 6.2.3).

3 Start the calibration procedure with c.

4 Immerse the electrode and the temperature probe in the pH 7.0 ± 0.5 buffer solution.

5 If necessary, set the temperature of the first buffer solution with 82.

6 Use [Adj. Asy.] to call up the input field for the nominal pH value of the buffer solution.

7 Use 82 (and 46) to select the nominal pH value of the buffer solution (at the current temperature).

8 Confirm the nominal pH value with g.

9 Use [ESC] to leave the input field for the nominal pH value.

10 Use g to display the slope (mV/pH), the asymmetry (mV), and the calibration evaluation (probe symbol).

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pH inoLab 740

Two-pointcalibration

11 Use g to go on to the two-point calibration or terminate after the single-point calibration with m(the present calibration data remain stored).


13 Immerse the electrode and the temperature probe in the second buffer solution.

14 If necessary, set the measured temperature value of the second buffer solution with 82 .

15 Use [Adj. Asy.] to call up the input field for the nominal pH value of the buffer solution.

16 Use 82 (and 46) to select the nominal pH value of the buffer solution (at the current temperature).

17 Confirm the nominal pH value with g.

18 Use [ESC] to leave the input field for the nominal pH value.

19 Press the g key.The slope S (in mV/pH), asymmetry UAsy (in mV) and calibration valuation (probe symbol) appear on the display.

20 Press the g key.The calibration is finished.

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NoteAfter the calibration is finished, the calibration record is automatically printed if the printer is ready for operation. Information on setting up a printer and on the printout of further calibration protocols is given in chapter 12 DATA OUTPUT and section 12.2.4 PRINTING.

6.3 Measuring the pH value

Preparatory activities Perform the following preparatory activities when you want to measure:

NoteIncorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly. The measuring system has to be calibrated before measuring.

Temperature probe You can measure with or without a temperature probe. If a temperature probe is connected, it is indicated on the display by v.

NoteIf you use a pH electrode without temperature probe, you can also use the temperature probe of a D. O. probe or a conductivity measuring cell (see section 5.5.2 MEASURING THE TEMPERATURE). If you use the temperature probe of a D. O. probe or a conductivity measuring cell, y or z appears on the display.

1 Connect the electrode to the measuring module.


3 Call up the pH measured value display with 46.

4 Adjust the temperature of the solutions and measure the current temperature if the measurement is made without a temperature probe.

5 With manual temperature input:Use 82 to call up the temperature input field and adjust the temperature.Use [ESC] to terminate the temperature input.

6 Calibrate or check the measuring system with the electrode.

7 Switch to the measuring mode with m.

1 Perform the preparatory activities.

2 Immerse the pH electrode in the test sample.The display shows the current measured value.

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pH inoLab 740

AutoRead(drift control)

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value.With identical measuring conditions, the maximum deviation is 0.02.

NoteIn order to accept the current measured value without waiting for the end of the AutoRead function, press g on the terminal or on the measuring module. You can only change to another measured variable after completion of the AutoRead function.


2 Call up the pH measured variable with 46.

3 Immerse the pH electrode in the test sample.

4 Activate the AutoRead function with a.The h display indicator appears. The current measured value is frozen (hold function).

5 Start the AutoRead measurement with g.The h AR display indicator flashes. When a stable signal is reached, an acoustic signal is heard and h stops flashing.

6 If necessary, start the next AutoRead measurement with g.

7 To terminate the AutoRead function: Press the a key.

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6.4 Measuring the ORP voltage

The measuring system can measure the ORP voltage of a solution in conjunction with a ORP electrode, e.g. SenTix ORP.

NoteNote that, when measuring voltages, it can take a long time (even several hours) until the measured value becomes stable.

ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.


2 Call up the measured variable U with 46.

3 Submerse the ORP electrode in the sample.

4 Wait for a stable measured value.

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inoLab 740 Ion concentration

7 Ion concentration

For the inoLab 740 measuring modules: pH, pH/ION, pH/Cond and Multi.

7.1 Settings for ISE

We recommend checking the current settings and correcting them if necessary before a measurement.

7.1.1 Displaying pH/ISE or measured voltage values

In pH/ISE measurements, inoLab 740 enables a rapid changeover between the display of the pH/ISE value (pH) and voltage (U).

7.1.2 Setting up the ISE display

Ion-selective electrodes are connected to the pH/U connector of the measuring module. The selection of the measured variable ISE or pH is made in the main Meas menu. The active pH or ISE setting is marked with ✔.

Measured variable, ISE

1 Activate the Display mode.

2 Switch to the display of the pH/ISE value with m.

3 Switch between the measured value display of the pH/ISE value (pH) and voltage (U) with 46.



3 Select the ISE menu item with 82.

4 Confirm the ISE menu item with g.The ISE display is active (✔).

5 Terminate the Menu mode with m.The ion concentration appears on the display (mg/l).

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Ion concentration inoLab 740

7.1.3 Determining the measuring range

You can select the measuring range manually or have it selected automatically. We recommend setting the measuring range manually when the intended measurement is output to a recorder at the same time.

You can determine the measuring range for measuring the conductivity as follows:

Automatic selection of the measuring range (AutoRange)

Manual selection between the following measuring ranges:

NoteIf you are using a recorder, we recommend deactivating the AutoRange function. Specify the expected measuring range manually. Otherwise, the recorder scaling will change to a different range due to the switch-over.

Manual selectionof the measuring range

The AutoRng function has to be switched off for the manual selection of the measuring range.

Concentration [mg/l]

Measuring range 1 (Resolution) 0.000 ... 9.999 (0.001)



Measuring range 4 (Resolution) 0 ... 1999 (1)

1 Switch to the Display mode.

2 Use 46 to select the required measuring range.

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Automatic switch-overof the measuring range

7.1.4 Measured value resolution of voltage display

See section 6.1.3


No default settings are specified for ion-selective measurements.



3 Select the ISE setup menu item with 82.

4 Confirm the ISE setup menu item with g.

5 Select the AutoRng menu item with 82.

6 Confirm the AutoRng menu item with g.i appears on the display.


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7.2 Advanced settings for ISE

For the inoLab 740 pH/ION measuring module.

7.2.1 Units of the ISE display

You can select the units of the measured value:






6 Select the Unit menu item with 82.

7 Confirm the Unit menu item with g.

8 Select a Unit with 82.

9 Confirm the Unit with g.The selected Unit is active (✔).

10 If mg/l was selected:

Continue with step 14.

11 If mol/l was selected:

Select a Ion type with 82.Continue with step 13.

12 If mg/kg, ppm, % was selected:

Enter the density of the sample with 82.Continue with step 13.

13 Confirm the entry with g or [ESC].The units change over.

14 Switch to the measured value display.

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7.2.2 Blank value correction (Bw Corr)

If the ion concentration in the sample is so small that it does not lie in the linear range of the electrode, you can increase the ion concentration in the linear range with the blank value correction by the addition of a blank value solution.The displayed measured value is the difference between the actual measured value and the determined blank value.




4 Confirm the ISE menu item with g.



7 Select the Bw Corr menu item with 82.

8 Confirm the Bw Corr menu item with g.The Bw Corr function is active (✔).The flashing - symbol appears on the measured value display.

9 Perform a calibration (see section 7.3).

10 Use m to finish the calibration.The prompt for the measurement of the blank value appears.


12 Immerse the electrode in the blank value solution.


14 Confirm Yes with g.

15 Terminate the blank value determination with [ESC].

The - symbol no longer flashes. The displayed measured value is reduced by the blank value.

The blank value correction is active until the blank value is switched off.

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7.2.3 Reference measurement (Ref Meas)

A reference measurement enables you to assign the voltage value 0 mV to the calibration curve of your electrode for a specific ion concentration (reference concentration).

Prerequisite:

The measured value display must show the voltage.

A valid calibration must be available.


2 Only if no valid calibration is available (no sensor symbol on the measured value display):

Perform a calibration (see section 7.3).

3 Switch to the display of the voltage (U) with m.







10 Select the Ref Mess menu item with 82.

11 Confirm the Ref Meas menu item with g.The Ref Mess function is active (✔).

The - symbol flashes on the measured value display.

12 Switch to the measured value display with m.

13 Open the input field for temperature and reference concentration with 82.

14 Select the input field R with [Next].

15 Enter the reference concentration R with 82.

16 Use [ESC] to leave the input field.

The measured voltage value is referred to the new reference concentration.

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7.2.4 Criterion for AutoRead (AutoRead)

The AutoRead criteria affect the reproducibility of the measured values. The following criteria can be adjusted:

high: highest reproducibility

medium: medium reproducibility

low: lowest reproducibility

NoteIncreasing reproducibility also causes the response time to increase until a measured value is evaluated as stable.







7 Select the AutoRead ... menu item with 82.

8 Confirm the AutoRead ... menu item with g.The setting of the criterion for AutoRead opens.

9 Select the setting for AutoRead with 82.

10 Leave the setting for AutoRead with [ESC].The setting of the criterion for AutoRead is active.

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7.3 Calibration for ion-selective measurements

Why calibrate? Ion-selective electrodes age and are temperature-dependent. This changes the slope. Calibration determines the current slope of the electrode and stores it in the measuring system.

Thus, you should calibrate before each measurement and at regular intervals.

NoteFor calibration, use tempered standard solutions with a temperature that differs by a max. of ± 2 °C from the temperature of the test sample.

When to calibrate? Before any concentration measurement if possible

After connecting another electrode

When the sensor symbol flashes after a voltage disconnection, e.g. battery change

ISECal This is the conventional two-point or three-point calibration procedure that uses 2 or 3 freely selectable standard solutions. The concentration expected in the measurement determines the concentration of the calibration standards to be selected.

AutoRead The calibration procedure automatically activates the AutoRead function. In order to accept the current measured value without waiting for the end of the AutoRead function, simply press g.

DisplayISE temp?

If you are using a temperature probe, any temperature deviation (± 2 °C) of the standard solutions that is too large is signaled by the display indicator, ISE temp?.


NoteYou can automatically print a calibration record following calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed.

Sample printout:

Calibration ISECal Date: 05.12.1999Cal Time: 22:46ISE Cal TmanStd 1 0.010mg/lStd 2 0.020mg/lC1 168.5 mV 23°CC2 186.1 mV 23°CS 58.7mVSensor +++User: xxxxx

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Electrodeevaluation

After the calibration, the measuring system evaluates the current status of the electrode. At the same time, the slope S (in mV) is evaluated. The evaluation appears on the display as the electrode evaluation.

Preparatory activities Perform the following preparatory activities:

NoteFor calibration, use tempered standard solutions with a temperature that differs by a max. of ± 2 °C from the temperature of the test sample.

Display Slope [mV]

50.0 ... 70.025.0 ... 35.0

E3 Eliminate the error according to chapter 6 WHAT TO DO IF...

1 Switch on the measuring system with e.


3 Connect a temperature probe to the measuring system so that any temperature differences that are too high will be indicated during calibration.

4 Keep the standard solutions ready.

5 Adjust the temperature of the standard solutions.



8 Confirm the ISE menu item with 82.

9 Confirm the ISE menu item with g.The measured variable ISE appears on the display (✔).

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Calibration Use two or three different standard solutions. For the three-point calibration, the standard solutions have to be selected in either increasing or decreasing order.

NoteThe measurement precision is also dependent on the selected standard solutions. Therefore, the selected standard solutions should cover the expected value range of the subsequent concentration measurement.

Standard solution

Values [mg/l]

Std 1 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100; 200; 500; 1000If Std 2 > Std 1, Std 3 must be > Std 2If Std 2 < Std 1, Std 3 must be < Std 2

Std 2

Std 3

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7.3.1 Two-point and three-point calibration

Two-pointcalibration

1 Perform the preparatory activities.

2 Switch to the ISE display with m and/or 46.

3 Press the c key. A field to select the concentration of the first standard solution is displayed.

4 Use 82 to enter the concentration of the first standard solution.

5 Immerse the electrode in standard solution 1.

6 Press the g key.The electrode voltage is displayed and the h display indicator flashes.

7 If necessary, set the temperature of the standard solution with 82 (see section 5.5.2).

8 As soon as a stable value is reached, h stops flashing and the field to input the concentration of the second standard solution appears.

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NoteThe calibration curve after the two-point calibration is determined by linear regression. The values of the two-point calibration are then stored.

Three-pointcalibration

9 Use 82 to enter the concentration of standard solution 2.





14 As soon as a stable value is reached, h stops flashing. The slope (mV) of the electrode is displayed after the two-point calibration. The probe symbol shows the electrode evaluation after the two-point calibration.

15 Use m to finish the calibration.

or

Continue to the three-point calibration with g.

16 Press the g key.The previously set up concentration of the third standard solution appears on the display.

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17 Use 82 to enter the concentration of standard solution 3.





22 As soon as a stable value is reached, h stops flashing. The slope (mV) of the electrode is displayed.The probe symbol shows the electrode evaluation after the previous calibration.

23 Use m to finish the calibration.orIn the case of the pH/ION measuring module:Continue to the four-point to six-point calibration with g (see section 7.3.2).

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NoteIn the pH/ION measuring module, the calibration curve is determined by spline interpolation. In all other measuring modules with the ISE function, the calibration curve is determined by linear regression.

7.3.2 Four-point to six-point calibration


Beyond the three-point calibration, a four-point, five-point or six-point calibration is also possible in the pH/ION measuring module.

Use different standard solutions for this. The standard solutions have to be selected in either increasing or decreasing order.

NoteThe measurement precision is also dependent on the selected standard solutions. Therefore, the selected standard solutions should cover the expected value range of the subsequent concentration measurement.

Standard solution

Values [mg/l]

Std 1 - 6 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100; 200; 500; 1000If Std 2 > Std 1, Std 3-6 must be > Std 2If Std 2 < Std 1, Std 3-6 must be < Std 2

1 Perform a three-point calibration (see section 7.3).

2 Continue to the four-point to six-point calibration with g.The previously set up concentration of the next standard solution appears on the display.

3 Use 82 to enter the concentration of the fourth standard solution.

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NoteYou can also terminate the calibration prematurely with m. The values of the previous calibration the remain stored.The calibration curve is determined by spline interpolation.


5 Immerse the electrode in the next standard solution.



8 As soon as a stable value is reached, h stops flashing. The slope (mV) of the electrode is displayed.The probe symbol shows the electrode evaluation after the previous calibration.

9 For carrying out a multipoint calibration:Repeat steps 2 - 8.

10 To return to the measuring mode: Press the m key.

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7.4 Measuring the ion concentration

Preparatory activities Perform the following preparatory activities when you want to measure the concentration using ion-sensitive electrodes:

NoteIncorrect calibration of ion-sensitive electrodes will result in incorrect measured values. Calibrate regularly before measuring.

Temperature probe The temperature measurement is absolutely essential for a reproducible measurement. You can perform concentration measurements using an NTC30 or Pt1000 external temperature probe using the integrated temperature probe of another probe, or without a temperature probe. The temperature probe that is used is indicated on the display by v, y, or z.

NoteThe measuring system automatically recognizes the type of the temperature probe used. If the measurement is made without a temperature probe, proceed as follows:

Measuringthe concentration

Measure the concentration as follows:


2 Adjust the temperature of the solutions, or measure the temperature if the measurement is made without a temperature probe.

3 Select the ISE measuring mode.

4 Calibrate or check the measuring system using the ion-sensitive electrode.

1 Measure the current temperature of the test sample.

2 Adjust the temperature of the test sample and the calibration standards to the same temperature (maximum deviation: ± 2 °C).

1 Perform the preparatory activities according to section 7.4

2 Immerse the electrode in the test sample.

3 Press the m key until ISE appears. The concentration value appears on the display.

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AutoRead(drift control)

The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value. The pH/ION measuring module allows a setting of the AutoRead criterion (see section 7.2.4).

NoteBefore accepting a measured value, make sure that it is stable for a longer period of time.In order to accept the current measured value without waiting for the end of the AutoRead function, press g.

7.4.1 Select the measuring method


The following methods are supported:

Standard Addition (Std Add)

Double Standard Addition (Std Add ++)

Standard Subtraction (Std Sub)

Sample Addition (Smp Add)

Sample Subtraction (Smp Sub)

Blank value Addition (Bw Add)

1 Call up the ISE measuring mode with m.

2 Immerse the electrode in the test sample.

3 Activate the AutoRead function with a.The current measured value is frozen.

4 Start AutoRead with g. h flashes until a stable measured value is reached. The stable measured value is transmitted to the printer or interface.

5 If necessary, start the next AutoRead measurement with g.


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1 Switch on the measuring system with e.


3 Connect a temperature probe to the measuring system so that any temperature differences that are too high will be indicated during calibration.

4 Keep the standard solutions ready.

5 Adjust the temperature of the standard solutions.




9 Confirm the ISE menu item with g.The ISE measured variable appears on the display (✔).

10 Select the ISE Adv. menu item with 82.

11 Confirm the ISE Adv. menu item with g.The menu with the measuring methods opens.

12 Select a method with 82.

13 Confirm the method with g.Measurement with the selected method begins.

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7.4.2 Standard Addition (Std Add)

In the "Standard addition" procedure, a known amount of standard solution is added to the sample.

The ion concentration in the sample is calculated from the change in potential.

Measuring

1 Select the measuring method (see section 7.4.1).

2 Prepare two standard calibration solutions.

3 Perform a two-point calibration according to the user guidance.

4 As soon as a stable value for the second standard calibration solution is reached, the display indicator h stops flashing. The slope (mV) of the electrode is displayed after the two-point calibration. The probe symbol shows the electrode evaluation after the two-point calibration.

5 Start the measurement with [Start].A window for the entry of data opens.

6 Enter Sample volume and ISA/TISAB volume with 82 and [Next].


8 Immerse the electrode in the sample.

9 Start the measurement with [Start].

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10 Add the standard solution to the sample.


12 Enter Standard volume, Standard concentration and Ion type with 82 and [Next].

13 Terminate the measurement with [Start].

14 Start a new measurement with [Next].

15 Repeat steps 7 - 13 for all samples.

16 Terminate the measurement with [ESC].

A security prompt appears.



Terminate the measurement.

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7.4.3 Double Standard Addition (Std Add ++)

In the "Double Standard Addition" procedure, a known amount of standard solution is added to the sample in two steps.

The ion concentration in the sample is calculated from the change in potential between the first and second addition of standard solution.

To ensure reproducibility, the second addition of standard solution must use a volume that is twice as big as the volume used in the first addition.

Measuring1 Start the measurement with [Start].

A window for the entry of data opens.





6 Add standard solution (1 Vol.% of the sample solution).


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8 Enter Standard volume, Standard concentration and Ion type with 82 and [Next].

9 Continue the measurement with [Start].

10 Add the standard solution (2 Vol% of the sample solution).

11 Continue the measurement with [Start].




A security prompt appears



The measurement is terminated.

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7.4.4 Standard Subtraction (Std Sub)

In the "Standard Subtraction" procedure, a known amount of standard solution is added to the sample (as complexing agent or precipitating agent) and, thus, the ion concentration lowered.


Measuring










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12 Enter Standard volume, Standard concentration and Ion type for the sample (#1) and standard solution (#2) with 82 and [Next].

13 For the entry of a self-defining type of ion (??):

Select the ?? entry for the ion in the sample (#1) with 82. Set the valency and molecular weight for the ion in the sample with [Next] and 82.Select the ?? entry for the ion in the standard solution (#2) with [Next] and 82. Set the valency and molecular weight for the ion in the standard solution with [Next] and 82.


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7.4.5 Sample Addition (Smp Add)

In the "Sample addition" procedure, a known amount of sample is added to the standard solution.


Measuring












5 Start the measurement with [Start].The entry window for Standard volume, Standard concentration and ISA volume opens.

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6 Enter Standard volume, Standard concentration and ISA volume with 82 and [Next].


8 Immerse the electrode in the standard.


10 Add the sample to the standard solution.




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7.4.6 Sample Subtraction (Smp Sub)

In the "Sample Subtraction" procedure, a known amount of sample is added to the standard solution.


The sample subtraction is one method for the indirect determination of ions. It is used for the determination of ions for which no direct determination is possible.

A sample addition of 1% of the volume of the standard solution prevents the sample matrix having an interfering influence on the measurement.










3 Perform a two-point calibration according to user guidance.


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Measuring5 Start the measurement with [Start].

The entry for Standard volume, Standard concentration and ISA volume opens.



8 Immerse the electrode in the standard solution.




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12 Enter the Standard volume, and the Ion type for the sample (#1) and standard solution (#2) with 82 and [Next].

13 For the entry of a self-defining type of ion (??):

Select the ?? entry for the ion in the sample (#1) with 82. Set the valency and molecular weight for the ion in the sample with [Next] and 82.Select the ?? entry for the ion in the standard solution (#2) with [Next] and 82.Set the valency and molecular weight for the ion in the standard solution with [Next] and 82.









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7.4.7 Standard addition with blank value correction (Bw Add)

In the "Standard addition with blank value correction" procedure, a known amount of standard solution is added to the sample in two steps.

The ion concentration in the linear range of the electrode characteristic curve is increased with the first addition.

The second addition is equivalent to the standard addition.


Measuring






6 Enter the volume of the sample (Smp Vol), volume of the ISA solution (ISA Vol), volume of the blank value solution (Bw Vol) and concentration of the blank value solution (Bw Conc) with 82 and [Next].

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8 Immerse the electrode in the sample increased with the blank value.




12 Enter the volume of the standard solution (Std volume), concentration of the standard solution (Std conc.) and Ion typewith 82 and [Next].




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inoLab 740 Dissolved oxygen (D. O.)

8 Dissolved oxygen (D. O.)

Measuring modules for the inoLab 740: Oxi, BSB/BOD and Multi.

8.1 Settings for D. O. measurements

In order to achieve comparable and reproducible measuring results, we recommend checking the current settings before measuring.


For D. O. measurements, two measuring ranges with different resolutions are available.

Range from 0 to 19.99 mg/l dissolved oxygen. Standard range for all aqueous test samples.

Range from 0 to 90.0 mg/l dissolved oxygen. This range may be necessary for non-aqueous test samples (measuring ranges: see chapter 15 TECHNICAL DATA).

NoteWhen connecting a recorder, deactivate the AutoRange function if measured values are also expected outside the range of 0 ... 19.99 mg/l. Otherwise, the recorder scaling at the range limits will change.



3 Select the Oxi setup menu item with 82.

4 Confirm the Oxi setup menu item with g.


6 Confirm the AutoRng menu item with g.The i display indicator appears on the display.


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Dissolved oxygen (D. O.) inoLab 740

8.1.2 Displaying the air pressure

You can display the current air pressure in mbar.

NoteThe value always shows the absolute air pressure. It does not refer to altitude above sea level.

8.1.3 Salinity correction

When measuring the concentration of test samples with a salt content of more than 1 g/l, a salinity correction is required. To do this, you have to enter the salinity equivalent of the test sample (range 0.0 - 70.0) and to switch on the salinity correction.

Entering thesalinity



3 Select the Oxi setup menu item with 82.

4 Confirm the Oxi setup menu item with g.

5 Using 82 select the menu item Atm. press.

6 Using g confirm the menu item Atm. press.The atmospheric pressure is displayed.

7 Press [ESC] to close the air pressure display and terminate the Menu mode.



3 Select the Set Sal ... menu item with 82.

4 Confirm the selected menu item with g.The input field for the salinity appears on the display.

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Switching thesalinity correction on/

off

You can switch the salinity correction on/off. The k display indicator appears on the display when the salinity correction is switched on.

5 Option:Select a digit with 46.

6 Increase or reduce the salinity value with 82.

7 Use [ESC] to terminate the input.



3 Select the Include sal menu item with 82.

4 Confirm the Include sal menu item with g.The salinity correction is active (✔).k appears on the display.


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You can reset (initialize) the settings for the D. O. measurement to the default settings.

The following functions are reset:

Reset O2 With the O2 reset, all the settings for D. O. measurements are reset to the default values.

Measuring mode D. O. concentration

Relative slope (SRel) 1.00

Salinity (value) 0.0

Salinity (function) off



3 Select the Reset O2 menu item with 82.

4 Confirm the selected menu item with g.The default settings for D. O. measurements are restored. The Menu mode is terminated.

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8.2 Calibrating for D. O. measurements

Why calibrate? D. O. probes age. This changes the slope of the D. O. probe. As a result, an inexact measured value is displayed. Calibration determines the current slope of the probe and stores this value in the instrument.

After calibrating the D. O. probe in the air calibration vessel, the measuring system displays a value of approx. 102% oxygen saturation. If the value of the oxygen saturation obtained by checking the probe in the air calibration vessel is different from this, it is necessary to calibrate or clean the probe.

If possible, check the probe signal in the air calibration vessel before each series of measurements.

When to calibrate? At regular intervals (14 days)

After connecting another D. O. probe

Calibration procedures The following calibration procedures are provided:Calibration in water vapor-saturated air. To calibrate the CellOx 325, use the OxiCal®-SL air calibration ves-sel (accessory), to calibrate the DurOx 325, use the OxiCal®-D air calibration vessel (contained in the scope of delivery of the sensor).

Calibration via a comparison measurement* (e. g. Winkler titration according to DIN EN 25813 or ISO 5813). At the same time, the relative slope is adapted to the comparison measurement by a correction factor.

AutoRead The calibration procedure automatically activates the AutoRead function. The h display indicator flashes. The calibration process is finished when h stops flashing.


NoteYou can automatically print a calibration record after the calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed.

Sample printout:

* for the inoLab Oxi 740 and BSB/BOD 740 measuring modules

Calibration O2Cal Date: 05.12.1999Cal Time: 22:46Cal Interval: 14 daysOxiCalRel. slope 0.73Sensor +++User: xxxxx

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Probe evaluation After the calibration, the measuring module evaluates the current status, i. e. the relative slope, of the probe. The evaluation appears on the display. Low values indicate that the electrolytic solution will soon be depleted and the probe will have to be regenerated.

Display Relative slope

S = 0.8 ... 1.25

S = 0.7 ... 0.8

S = 0.6 ... 0.7

E3


S < 0.6 or S > 1.25

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8.2.1 Settings

Calibration interval The calibration interval is used to determine after how many days you want to be reminded that a D. O. calibration is due.

Select calibrationprocedure *

*



3 Select the Cal Int. ... menu item with 82.

4 Confirm the Cal Int. ... menu item with g.The input field for the calibration interval appears.


6 Set the required interval (days) with 82.

7 Confirm the calibration interval entered with g.




3 Use 82 to select the Oxi Caltype.

4 Confirm the OxiCaltype menu item with g.

5 Use 82 to select the menu item OxiCal or OxiTitr.


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8.2.2 Calibrating with the air calibration vessel

Proceed as follows to calibrate the measuring system:

Preparatory activities

NoteThe sponge in the air calibration vessel must be moist (not wet). Follow the instructions in the OxiCal®-SL operating manual.

NoteIn the measuring mode, the system should display an oxygen saturation of approx. 102% in the air calibration vessel.

1 Connect the D. O. probe to the measuring module.

2 Keep the OxiCal®-SL air calibration vessel ready.

3 Put the D. O. probe into the air calibration vessel.

4 Press the c key.

5 Press the g key. h flashes until a stable value is reached.The probe symbol shows the relative slope that has been determined and the probe evaluation (see page 124).

6 Use g to finish the calibration.

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8.2.3 Calibrating via a comparison measurement *


1 Connect the D. O. probe to the measuring instrument.

2 Press the c key.

3 Immerse the D. O. probe in the calibrating solution.

4 Press the g key. The AutoRead measurement begins. When the measured value is stable, the input field for the Fac. correction factor opens.

5 Perform a comparison measurement, e. g. Winkler titration, with the calibrating solution (determine the nominal value). Leave the measuring instrument switched on until the nominal value is determined.

6 Increase/reduce the correction factor with 82 (and 46), until the displayed measured value corresponds to the nominal value.

7 Use m or [ESC] to leave the input field and finish the calibration.

8 Remove the D. O. probe from the calibrating solution.

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8.3 Measuring the D. O. content

You can display the following measured parameters:

D. O. concentration

Oxygen saturation

Oxygen partial pressure

Preparatory activities Preparatory activities before the measurement:

NoteAn incorrect calibration of the measuring system with D. O. probes will cause incorrect measured values. Calibrate at regular intervals.

Temperature probe The D. O. probe has an integrated temperature probe that always measures the current temperature of the test sample.

Probe with stirrer The StirrOx G D. O. probe has a temperature probe and stirrer integrated in it. Using the key on the probe, switch the stirrer on and off. When the stirrer is switched on, 3 appears on the display.

Salinity correction When measuring the concentration in test samples with a salt content of more than 1 g/l, a salinity correction is required.

Displaying the D. O.content

1 Connect the D. O. probe to the measuring module.The measuring system identifies the probe and displays a measured value for oxygen. If the oxygen probe is already plugged in, press m several times until a measured value for oxygen appears on the display.

2 Calibrate or check the measuring system with the probe (see section 8.2).

1 Perform the preparatory activities according to section 8.3.

2 Immerse the D. O. probe in the test sample.The measured variable last selected appears on the display.

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8.3.1 Selecting the measured value display

D. O. concentration

D. O. saturation

D. O. partial pressure

1 Press the 46 key repeatedly until the oxygen concentration appears on the display in mg/l.

2 Press the 46 key repeatedly until the saturation in % appears on the display.

3 Press the 46 key repeatedly until the D. O. partial pressure in mbar appears on the display.

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8.3.2 Drift control (AutoRead)

The AutoRead function checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values.

When using a probe with integrated stirrer (StirrOx G), the measurement with AutoRead can be started using the key on the probe. As soon as a stable measured value is reached, the stirrer switches itself off.

NoteIn order to accept the current measured value without waiting for the end of the AutoRead function, simply press g on the terminal or measuring module or the key on the StirrOx G probe.

1 Use m to call up the Display mode.

2 Call up the oxygen measured variable with m.

3 Immerse the D. O. probe in the test sample.

4 Activate the AutoRead function with a. The h display indicator appears on the display.The measured value is frozen (hold function).

5 Start the measurement with AutoRead by pressing g or the key on the StirrOx G probe. The h display indicator flashes. If the StirrOx G probe is used: 3 flashes. When a stable signal is reached, an acoustic signal is heard and h stops flashing.If the StirrOx G probe is used: The 3 display indicator disappears.

6 If necessary, start the next measurement with AutoRead by pressing g or the key on the StirrOx G probe.


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Reproducibility criteria With identical measurement conditions, the following applies:

Measured parameter

Reproducibility Response time

D. O. concentration better than 0.05 mg/l > 10 seconds

Oxygen saturation index

better than 0.6 % > 10 seconds


better than 0.6 mbar > 10 seconds

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BOD inoLab 740

9 BOD

For the inoLab 740 BSB/BOD measuring module.

9.1 General information

For BOD measurements, the inoLab BSB/BOD enables:

The administration of a maximum of 30 samples.

The use of a maximum of 18 sample dilutions per sample.

The use of a maximum of 5 blank value solutions (for determination of the blank value).

The setting of the incubation time (5 to 30 days).

The assignment of names to the blank value solutions, samples, sample dilutions and routines (max. 12 characters for each name and max. 7 routines).

The simplification of entries by the use of an external IBM-PC keyboard (see section 4.2.3).

Automation by the use of BOD routines (see section 9.4);This enables BOD measurements to be automated by pressing a key for each measurement.

Automation by using the StirrOx G oxygen sensor with integrated stirrer;This enables measurement routines to be carried out simply with the key on the sensor.

Automation through the use of a barcode reader (see section 9.1.2);This makes the entry of the names of samples, sample dilutions and blank value solutions unnecessary.

The editing and printout of the measurement results (see section 9.3.1).

Preparatory activities Preparatory activities before the measurement:

NoteAn incorrect calibration of the measuring system with D. O. probes will cause incorrect measured values. Perform a calibration at regular time intervals (see section 8.2).

NoteThe drift control (AutoRead) function corresponds to the AutoRead function in section 8.3.2. BOD measurements are automatic AutoRead measurements.

1 Prepare blank value solutions and sample dilutions.

2 Calibrate or check the measuring system with the probe (see section 8.2).

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inoLab 740 BOD

9.1.1 Operation with the StirrOx G oxygen sensor

Use the key on the StirrOx G to switch on the stirrer and start a measurement with AutoRead at the same time.

This enables the automation of the BOD measurements.

When the stirrer is switched on, 3 appears on the display.

9.1.2 Operation with a barcode reader

Using a barcode reader makes it possible to fill out name fields on the display automatically using the barcode reader.

In addition, it is possible to start a measurement automatically after reading in a name field with the barcode by activating Scanner Automatic.

NoteIf the scanner is set to automatic, always check all the data shown on the display during a measurement first, and then terminate the entries by reading in the name in the name field. After reading in the barcode, the BOD measurement starts automatically.



3 Select the BOD menu item with 82.

4 Confirm the BOD menu item with g.

5 Select the BOD setup menu item with 82.

6 Confirm the BOD setup menu item with g.

7 Select the Scanner menu item with 82.

8 Confirm the Scanner menu item with g.The selection field for the scanner setting appears.

9 Select the required use of the barcode reader (automatic or manual) with 82.

10 Confirm the settings with [ESC].

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BOD inoLab 740

9.2 BOD measurement

9.2.1 Procedure

BOD measurements run according to the following sequence:

Start measurement at the beginning of the incubation period

– Measurement of the blank value solutions

– Measurement of the sample dilutions

End measurement after expiry of the incubation period

– Measurement of the blank value solutions

– Measurement of the sample dilutions

Editing and output of the measurement results

Names for samples, sample dilutions and blank value solutions are entered via the keys on the terminal, an external keyboard or via a barcode reader (see section 9.1.2).

9.2.2 Start measurement

Have the following data ready before the measurement:

Number of blank value solutions (max. 5)

Number of sample dilutions (max. 18)

Amount of sample (in ml) and total volume (in ml) of each sample dilution

Incubation period (5 to 30 days)

Names for blank value solutions, samples, sample dilutions and routines (each with a max. of 12 characters)

NoteThe expiry of a start measurement with routine corresponds to the start measurement without routine. Entry fields are filled out with the default values of the routine.





5 Select the Start Meas menu item with 82.

6 Confirm the Start Meas menu item with g.The Start measurement window appears.

To start a measurement without routine, continue at step 7.To start a measurement with routine, continue at step 15.

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inoLab 740 BOD

Start measurementwithout routine

7 Select No in the With routine field using 82.

The entry field New dilution water appears.

8 Swap between the entry fields with [Next].

9 Select Yes or No in the New dilution water field with 82.If New dilution water No was selected: The Number entry field disappears. The measurement of the blank value solutions is skipped. The blank value solutions last measured are used for the BOD determination.If New dilution water Yes was selected: The Number entry field appears. A new blank value solution is measured to determine the BOD value.


11 Only for New dilution water Yes:

Enter the number of the blank value solutions to be measured in the Number field with 82.

12 Only for New dilution water Yes: Swap between the entry fields with [Next].

13 Select the incubation period (in days) in the BOD field with 82.

14 Confirm the settings with [Start].If New dilution water No was selected: The Start measurement Sample window opens. Continue with step 28.For New dilution water Yes: The Start measurement Dilution water window opens. Continue with step 22.

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BOD inoLab 740

Start measurement withroutine

15 Check the data on the display.If the data is correct: Continue with step 17.To change the data: Continue with step 16.

16 Select Yes in the With routine field with 82.

The New dilution water entry field disappears.

17 Start the measurement with [Start]. The Samples window opens.

18 Select a routine name with 82.


20 Select Yes or No in the Dilution water field with 82.If New dilution water No was selected: The Number entry field disappears. The measurement of the blank value solutions is skipped. The blank value solutions last measured are used for the BOD determination.If New dilution water Yes was selected: The Number entry field appears.

21 Confirm the settings with [Start].If New dilution water No was selected: The Start measurement Sample window opens. Continue with step 28.For New dilution water Yes: The Start measurement Dilution water window opens. Continue with step 22.

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inoLab 740 BOD

Measurement of blankvalue solutions

Measurement of sampledilutions

22 Check the data on the display.If the data is correct: Continue with step 24.To change the data: Continue with step 23.

23 Enter a name with 82, external keyboard or barcode reader.

24 Immerse the sensor in the blank value solution.


26 Wait for the end of the measurement.

27 Repeat from step 22 to step 26 until all blank value solutions are measured. Subsequently, the Start measurement Sample window opens.

28 Check the data on the display. If the data is correct: Continue with step 32.To change the data: Continue with step 29.

29 Enter a name for the sample dilution with 82, an external keyboard or via the barcode reader.


31 Enter the number of the sample dilutions in the Number field with 82 or an external keyboard.

32 Confirm the settings with [Start].The Start measurement Dilution 1 window appears.

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BOD inoLab 740


34 Enter a name with 82, an external keyboard or via the barcode reader.


36 Enter the volume of the sample in the Vol. sample field with 82 or an external keyboard.


38 Enter the total volume of the sample dilution in the Vol.Total field with 82 or an external keyboard.

39 Immerse the sensor in the sample dilution.

40 Start the measurement with [Start].The sample dilution is measured.


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inoLab 740 BOD

Saving the routine

42 Repeat from step 33 to step 42 for all sample dilutions.

Subsequently, the Routine STORE window opens.

43 Select Save Routine YES or No in the field with 82.

If Save Routine YES was selected, the routine is saved under a routine name.

44 Confirm the settings with [Ok].If Save Routine NO was selected, the start measurement is ended. If Save Routine YES was selected, an entry field for the routine name appears.


46 Enter a name for the routine with 82 or an external keyboard.

47 Confirm the entry with [Ok].

The start measurement is completed and the data are stored as a routine using the name entered.

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BOD inoLab 740

9.2.3 Stopping the BOD measurement

You can stop the measurement process at any time during a start measurement or end measurement.

NoteThe data of the start measurement are retained when an end measurement is stopped.

9.2.4 End measurement

The end measurement is carried out after the incubation period expires.

NoteNormally, you can confirm all windows and settings in the end measurement by simply pressing [Start]. The settings and values offered correspond to the values that were entered in the start measurement.

1 Initiate the stopping of the measurement with [ESC] or with m.A security prompt appears

2 Select Yes for the security prompt with [Next].

3 Confirm the stopping with g.The entries and measurements made up to now are deleted.





5 Select the menu item BOD end meas with 82.

6 Confirm the BOD end meas menu item with g.The Select sample window opens.

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NoteIn the case of an end measurement with barcode reader, any order of the measurement of blank value solutions and sample dilutions is acceptable. Reading in the identification automatically causes the correct assignment of the start measurement to the measured value.

In an end measurement without a barcode reader, follow the prescribed order of the measurements.

7 Select a sample in the name field with 82.The status field shows the status of the sample:

: incubation period still running : performing end measurement : end measurement already performed. : incubation period exceeded


9 Swap between the selection fields with [Next].

10 Select Yes or No in the KnownDil.Water (use known dilution water) field with 82.

Skip the end measurement of the blank value solutions with Yes. The end measurements of the known blank value solutions are used for calculating the BOD. Use No to carry out the end measurements also for the blank value solutions.

11 Begin the end measurement with [Start].If KnownDil.Water Yes was selected, continue with step 19.If KnownDil.Water No was selected, the End measurement window for the first blank value solution opens.

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12 Check the data on the display. If the data is correct: Continue with step 16. To change the data: Continue with step 13.


14 Select Yes or No in the Remove field with 82.If Remove No was selected, the (default) values from the start measurement are adopted.If Remove Yes was selected, no end measurement is performed for this blank value solution. The value appears on the report marked by *. This value is not used for calculating the BOD value.

15 Immerse the sensor in the blank value solution.

16 Confirm the settings with [Start].If Remove Yes was selected, a security prompt appears before the removal. After confirmation with Yes, the next blank value solution is offered for the end measurement (see step 12).If Remove No was selected, the measurement of the blank value solution begins.


18 Repeat from step 12 to step 18 for all blank value solutions.

Subsequently, the End measurement window opens for the sample dilutions.

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21 Select Yes or No in the Remove field with 82.If Remove No was selected, the end measurement is carried out.If Remove Yes was selected, the end measurement is not carried out. The value appears on the report marked by *. This value is not used for calculating the BOD value.

22 Immerse the sensor in the sample dilution.

23 Confirm the data with [Start].If Remove Yes was selected, a security prompt appears before the removal. After confirming with Yes the next sample dilution is offered (see step 19).If Remove No was selected, the measurement of the sample dilution begins.


25 Repeat from step 19 to step 24 for all sample dilutions.Subsequently, the End status BOD window opens.

26 Display and edit the measurement result with [Open] (see section 9.3.1)or Terminate the end measurement with [ESC].

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9.3 BOD result

9.3.1 Displaying, editing and printing the measurement result

After the end measurement is completed, you can display, edit and print out the measurement result.

The editing is restricted to the IDs of blank value solutions and sample dilutions that are not included in the calculation.

Displaying themeasurement result





5 Select the BOD result menu item with 82.

6 Confirm the BOD result menu item with g.

7 Select a sample name with 82.The status field shows the status of the sample:

: incubation period still running : performing end measurement : end measurement already performed : incubation period exceeded

8 Display the result with [Open].

9 View the measured data with 82 (a small arrow on the left edge of the display shows the selected line).

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Editing themeasurement result

Printing themeasurement result

10 Select a line containing a measured value with 82 (a small arrow on the left edge of the display shows the selected line).

11 If necessary, use g to exclude the measured value of the BOD calculation (small * on the right edge of the display). The value also appears in the report marked by *. This value is not used for calculating the BOD value.

12 Print out the result with p.

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BOD inoLab 740

Sample printout:

14.03.2001 16:04:53=======================================BOD 5 reportSample ID :1_______________________________________

Start measurement from 14.03.2001 14:02:29 to 14.03.2001 14:03:38Final measurement from 19.03.2001 15:03:35 to 19.03.2001 15:04:44

Dilution water_______________________________________ID: 1Start :7.87 mg/lEnd :7.15 mg/lBlank value :0.72 mg/l

ID: 2Start :7.87 mg/lEnd :7.87 mg/lBlank value :0.00 mg/lMeasurement is removedBlank value = 0.72 mg/lSample dilution_______________________________________ID: test1Sample volume :100 mlTotal volume :1000 mlStart :7.87 mg/lEnd :7.87 mg/lBOD 5 :-6.48 mg/lMeasurement is removed

ID: test2Sample volume :100 mlTotal volume :1000 mlStart :7.87 mg/lEnd :7.87 mg/lBOD 5 :-6.48 mg/l

ID: test3Sample volume :100 ml

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9.3.2 Deleting BOD measurement results

Deleting individual BODmeasurement results

Deleting all BODmeasurement results





5 Select the Delete BOD menu item with 82.

6 Confirm the Delete BOD menu item with g.

7 Select the Sample menu item with 82.

8 Confirm the Sample menu item with g.The Select sample window opens.

9 Select a sample name with 82.The status field shows the status of the sample:

: incubation period still running : performing end measurement : end measurement already performed : incubation period exceeded

10 Confirm the selection with [Ok].The security prompt opens.


12 Confirm the deleting of the dataset with g.The display shows a confirmation of the deleted dataset.







7 Select the All samples menu item with 82.

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BOD inoLab 740

9.4 Routines

9.4.1 Setting up routines

Routines define constantly recurring measurement procedures. This includes the number and name of blank value solutions and sample dilutions as well as the dilution ratios.

Routines are set up

Before the first measurement:Complete routines can be set up in the BOD menu.

At the end of a start measurement:You can save the current settings as a routine in the Save routine window.

Have the following data ready before setting up a routine:

Number of blank value solutions (max. 5)

Number of sample dilutions per sample (max. 18)

Amount of sample (in ml) and total volume (in ml) of each sample dilution

Incubation period (5 to 30 days)

Names of the blank value solutions, samples, sample dilutions and routines (max. of 12 characters each)

8 Confirm the All samples menu item with g.The security prompt opens.


10 Confirm the deleting of all datasets with g.The display shows a confirmation of the deleting of all datasets.





5 Select the BOD setup menu item with 82.

6 Confirm the BOD setup menu item with g.

7 Select the New routine menu item with 82.

8 Confirm the New routine menu item with g.The Start measurement window appears.

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NoteWhen defining new routines, the same displays appear as in the start measurement. However, the measurement of samples is not shown. When defining routines, [Ok] always appears instead of the [Start] softkey. For a detailed description of the process, see section 9.2.2.

NoteAlso, an existing routine can be used as a template when defining new routines.

9.4.2 Starting a measurement with routine

When using the routines for measurement, the fields on the display are already filled out with the data from the routine. This simplifies operation during the measurement to confirming the individual window with [Start]. With the exception of selecting a routine, the course of the measurement does not differ from the start measurement without routine.

9.4.3 Deleting routines

The number of stored routines is restricted to 7. To create space for new routines, or to remove routines that are no longer required, routines can be deleted. It is possible to delete an individual routine or to delete all stored routines.

Deleting an individualroutine







7 Select the Routine menu item with 82.

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Deleting all routines

8 Confirm the Routine menu item with g.The Remove routine window opens.

9 Select a routine with 82.

10 Confirm the selection with [OK].A security prompt opens before the selection is deleted.


12 Confirm the deletion of the routine with g.The display shows that the selected routine has been successfully deleted.







7 Select the All routines menu item with 82.

8 Confirm the All routines menu item with g.A security prompt opens before the selection is deleted.


10 Confirm the deleting of all routines with g.The display shows a confirmation of the deleting of all datasets.

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inoLab 740 Conductivity

10 Conductivity

Measuring modules for the inoLab 740: Cond, pH/Cond and Multi.

10.1 Settings for conductivity measurements

In order to achieve comparable and reproducible measuring results, we recommend checking and, if necessary, correcting the current settings before measuring.


You can select the measuring range manually or have it selected automatically. We recommend setting the measuring range manually when the intended measurement is output to a recorder at the same time.

You can determine the measuring range for measuring the conductivity as follows:

Automatic selection of the measuring range

Manual selection between the following ranges with the following resolution:0.001 µS (if you use LR001), 0.01 µS (if you use LR01), 0.1 µS/cm, 1 µS/cm, 0.01 mS/cm, 0.1 mS/cm, 1 mS/cm

Measuring the salinity (Sal) and the total dissolved solids (TDS)

NoteIf you are using a recorder, we recommend deactivating the AutoRange function. Specify the expected range manually. Otherwise, the recorder scaling will change to a different range due to the switch-over.

Manual selectionof the measuring range

The AutoRng function has to be switched off for the manual selection of the measuring range.

Automatic switch-overof the measuring range


2 Use 46 to select the required range or Sal or TDS.



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10.1.2 Entering the reference temperature

You can select the reference temperature TRef = 25°C (Tref25) or TRef = 20°C (Tref20).

3 Select the Cond setup menu item with 82.

4 Confirm the Cond setup menu item with g.


6 Confirm the AutoRng menu item with g.i appears on the display.






5 Select the TRef25 or TRef20 menu item with 82.

6 Confirm the TRef25 or TRef20 menu item with g.

7 Terminate the Menu mode with m.When displaying the measured variable, conductivity, ( ) 5 or 0 appears on the display.

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10.1.3 Displaying the conductivity or specific resistance

You can select the display of the conductivity (in S/cm) or of the specific resistance (in MΩ cm).





5 Select the Cond MOhm menu item with 82.

6 Confirm the Cond MOhm menu item with g.The conductivity is displayed in the units, MΩ cm.

7 Use [ESC] to terminate the Menu mode.

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10.1.4 Setting the temperature compensation

The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see chapter 10.2 DETERMINING/SETTING UP THE CELL CONSTANT).

You can select the following temperature compensations for the temperature functions:

Nonlinear temperature compensation "nLF"according to EN 27 888

Linear temperature compensation "lin" with the adjustable coefficient of 0.001 to 3.000 %/KNo temperature compensation "off"

NoteSelect the following temperature compensations from the table according to the respective test sample:

Application notes

Setting the temperaturecompensation

Test sample Temperature compensation Display indicator

Natural water (ground water, surface water, drinking water)

nLFEN 27 888

n

Ultrapure water nLFEN 27 888

n

Other aqueous solutions

Linear temperature compensationSelect 0.001 ... 3.000 %/K

q

Salinity (seawater) Automatically nLF according to IOT

k, n



3 Use 82 to select one of the menu items, TC nLF or TC lin or TC off.

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10.1.5 Reset (Reset)

You can reset (initialize) the settings for the conductivity measurement.

In a reset, the following functions for the conductivity measurement are reset to the default settings:

4 Confirm the selected menu item with g.The temperature compensation is active (✔).


Measuring mode

Cell constant (c) 0.475 cm-1 (calibrated)0.475 cm-1 (set up)

Temperature compensation nLF

Reference temperature TRef25

Temperature coefficient (TC) of the linear temperature compensation

2.000 %/K

TDS factor 1.00



3 Select the Reset cond menu item with 82.

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NoteThe calibration data will be lost in a reset. Recalibrate after performing a reset.

10.2 Determining/setting up the cell constant

Why determine/set upthe cell constant?

Aging slightly changes the characteristics of the cell, e. g. by coatings. As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration determines the current cell constant and stores it in the instrument.Thus, you should calibrate at regular intervals (we recommend: every 6 months).

You can determine the actual cell constant of the conductivity measuring cell by calibrating with the control standard in the following ranges:

0.450 ... 0.500 cm-1 (e.g. TetraCon, nominal cell constant 0.475)

0.800 ... 1.200 cm-1

(cells with a cell constant of approx. 1)

For the fixed cell constant 0.01 cm-1, calibration is not required.

Cell constants outside the ranges mentioned above cannot be calibrated.

10.2.1 Determining the cell constant (calibration)

NoteThis method of automatically determining the cell constant by calibration with the 0.01 mol/l KCL standard solution can only be used for measuring cells with cell constants in the range 0.450 ... 0.500 cm-

1 or 0.800 ... 1.200 cm-1.

NoteIf the error message E3 appears, refer to chapter 14 WHAT TO DO IF...

Calibration procedure To determine the cell constant, you need a 0.01 mol/l KCl calibration solution.

4 Use g to confirm the Reset cond menu item.The default settings for conductivity measurements are restored. The Menu mode is terminated.

1 Start the determination of the cell constant with c.

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Calibration evaluation After calibrating, the measuring module automatically evaluates the calibration. The evaluation appears on the display.

Calibration record The measuring module automatically saves the cell constant in the calibration record. The last calibration protocol can be displayed at any time with the aid of the Cal Prot. function ... in the Cal menu (see section 11.3).

2 Immerse the measuring cell in the prepared calibration solution.

3 Press the g key in order to start the measurement with AutoRead to determine the cell constant.The h display indicator flashes until a stable signal is reached.The cell constant determined is displayed.

4 Return to the measuring mode with g or m.

Display Cell constant [cm-1]

0.450 ... 0.500 cm-1

0.800 ... 1.200 cm-1

E3


outside the ranges0.450 ... 0.500 cm-1

or0.800 ... 1.200 cm-1

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NoteYou can automatically print a calibration record after the calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed.

Sample printout:

Calibration interval The calibration interval is used to determine after how many days you want to be reminded that a conductivity calibration is due.

Conductivity calibrationCal date: 05.12.1999Cal time: 22:46Cal interval: 180 daysCal standard: 0.01 mol/l KClConductivity/Tref25:1413 µS/cm 24.6°CCell const: 0.987 1/cmSensor +++User: xxxxx



3 Use 82 to select the Cal Int. ... menu item.

4 Use g to confirm the Cal Int. ... menu item.The input field for the calibration interval appears.


6 Set the required interval (days) with 82.

7 Confirm the calibration interval entered with g.


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10.2.2 Setting the cell constant

NoteThe cell constant to be set must either be taken from the operating manual of the measuring cell or is printed on the measuring cell.

The inoLab 3 measuring system offers the following possibilities of setting the cell constant:

Accepting the cell constant from the last calibration record (Cal cell)

Selecting any cell constant within the range 0.250 to 2.500 cm-1 (Man cell)

Selecting any cell constant within the range 0.090 to 0.110 cm-1 (Man LR01)

Selecting the fixed cell constant 0.01 cm-1 (LR001)

NoteThe last calibration protocol can be displayed at any time with the aid of the Cal Prot. ... function in the Cal menu (see section 11.3 STORAGE OF CALIBRATION RECORDS).

Accepting the cellconstant of the

calibration record

Accept the cell constant of the last calibration record as follows:



3 Select the Cell const. menu item with 82

4 Confirm the Cell const. menu item.

5 Select the Cal cell menu item with 82.

6 Confirm the Cal cell menu item with g.The cell constant of the last calibration is accepted. Cal cell is active (✔).


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Selecting thecell constantin the range

0.250 ... 2.500 cm-1

You can set the cell constant manually in the range 0.250 ... 2.500 cm-1 as follows:





5 Select the Man cell menu item with 82.

6 Confirm the Man cell menu item with g.The input field for the cell constant opens. The current value is displayed.

7 Increase/reduce the value with 82.


9 Confirm the selected cell constant with g.The selected cell constant is accepted. Man cell is active (✔).


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Selecting thecell constantin the range

0.090 ... 0.110 cm-1

You can set the cell constant manually in the range 0.090 ... 0.110 cm-1 as follows:





5 Select the Man cell menu item with 82.

6 Confirm the Man cell menu item with g.The input field for the cell constant opens. The current value is displayed.

7 Increase/reduce the value with 82.


9 Confirm the selected cell constant with g.The selected cell constant is accepted. Man cell is active (✔).


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Selecting the cellconstant 0.01 cm-1

You can set the cell constant to the fixed value of 0.01 cm-1:





5 Use 82 to select the required cell constant LR 001 (0.01 cm-1).

6 Use 82 to select the required cell constant LR 001 (0.01 cm-1).

7 Confirm the selected cell constant with g.The selected cell constant is active (✔).


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10.3 Measuring the conductivity

10.3.1 General information

You can display the following measured parameters:

Conductivity/specific resistance (For details of how to switch over, see chapter 10.1 SETTINGS FOR CONDUCTIVITY MEASUREMENTS)

Salinity (Sal)

Total dissolved solids (TDS)

Preparatory activities Perform the following preparatory activities when you want to measure:

10.3.2 Displaying the conductivity, dry filtrate residue or salinity

You can switch back and forth between the measured variables, conductivity, dry filtrate residue and salinity:

1 Connect a conductivity measuring cell with temperature probe to the measuring module. The instrument recognizes the measuring cell and automatically switches to the conductivity measuring mode that was last selected. If the conductivity measuring cell is already connected, press the m repeatedly until the conductivity measuring mode appears.

2 Check the selected cell constant or calibrate the measuring module with the measuring cell. How to calibrate is described in section 10.2.1 DETERMINING THE CELL CONSTANT (CALIBRATION) on page 156.

1 Perform the preparatory activities according to section 10.3.1.

2 Immerse the measuring cell in the test sample.

3 Press the 46 key until the measured variable, conductivity, ( ) appears. The measured value appears on the display.

4 Press the 46 key until the measured variable, Sal, appears. The salinity value appears on the display.

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NoteSee also Application report ... 084 CONDUCTOMETRICAL DETERMINATION OF THE TOTAL DISSOLVED SOLIDS (TDS).

10.3.3 Drift control (AutoRead)

The drift control function (AutoRead) checks the stability of the measured value. The stability has a considerable effect on the reproducibility of the measured value.

5 Press the 46 key until the measured variable, TDS, appears. The TDS value appears on the display.

1 Select the required measuring mode with 46.

2 Immerse the conductivity measuring cell in the test sample.

3 Activate the AutoRead function with a.The measured value is frozen (hold function).

4 Start the measurement with AutoRead by pressing g.The h AR display indicator flashes. When a stable signal is reached, an acoustic signal is heard and h stops flashing.

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NoteIn order to accept the current measured value without waiting for the end of the AutoRead function, simply press g. You can only change to another measured variable after completion of AutoRead.

5 If necessary, start the next measurement with AutoRead by pressing g.

6 To terminate AutoRead: Press the a key.

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inoLab 740 Data storage

11 Data storage

Data storage enables the storage and administration of measurement, configuration and calibration data. The following types of storage are available:

Storage of measurement data records:This memory contains measurement data records for subsequent processing or output (see section 11.1)

Storage for system configurations (settings):This memory enables you to save and recall individual configurations (see section 11.2)

Storage for calibration records:This memory contains all current calibration records (see section 11.3)

11.1 Storage of measurement data records

Measurement data record memory enables the storage of measurement data records for subsequent processing or output.There are two methods of storing measurement data records:

Manual storage of individual measurement data records

Automatic storage of several measurement data records

A measurement data record consists of:

Number of the storage location (Mem no.)

Date/time

Identification (ID)

Measured values (e.g. pH and measured temperature value) with status information

To find data records easily, Mem no., ID and date/time are available as filter criteria. The identification (ID), which you allocate yourself, can be especially useful when doing this (see section 11.1.3). The ID can consist of a number, or, when using an external PC keyboard, of digits and letters.

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11.1.1 Saving individual measurement data records

You can store individual measurement data records and assign them an ID that makes it easier to find the data record again.


2 Start the manual storing with s.The Store window shows the current data record. The instrument automatically allocates a storage number (Mem no.) to the

3 Use [Ident] to open the Ident input window.

4 Input the required name (ID) with 82.

5 With g confirm the ID.In the manual type of storage, the measurement data record is stored together with the selected ID.

6 Use [ESC] to leave the Ident input window.The Store window shows the data record with the new ID.

7 With [ESC] leave the Store window.

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11.1.2 Automatically storing measurement data records

AutoStore enables measurement data records to be stored at defined time intervals. Starting AutoStore causes you to move to the Set AutoStore input window where you define the details of the storage with AutoStore.

ID:The name (ID) identifies the measurement and makes it easier to find the data in memory. The ID can consist of figures and letters (when using an external IBM PC keyboard).

Duration:Here you set up the measuring period for which the planned AutoStore storing is to be performed.

Interval:Here you determine the intervals at which the measuring data records will be stored.

Memory requirements (datasets):Here you obtain information on how many storage locations are required with the current settings.

Available memory locations:Here you obtain information on how many storage locations are still available.

NoteIf insufficient memory locations are available, a message appears on the display.Change the entries in the Duration and/or Interval field until an available number of memory locations is displayed.

Measurement data records can only be stored in a free memory location. If necessary, the contents of the memory must be deleted (see page 176).

Starting AutoStore1 Switch to the Menu mode.

2 Use 46 to select the main Mem menu.

3 Select the AutoStore menu item with 82.

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TerminatingAutoStore

AutoStore is automatically finished when the period set for storing (Duration) has expired. You can see that an AutoStore is terminated when 9 is no longer visible on the display.

If you want to quit an AutoStore storing procedure before the set period has expired, proceed as follows:

4 Confirm the AutoStore menu item with g.

5 Select the Open menu item with 82.

6 Confirm the Open menu item with g.The free memory locations are shown (black=free).

7 Use 82 to select a free memory location, Mem 1 ... -4 .

8 Confirm the menu item with g. The Set AutoStore input window is open.

9 Enter a name with 82, external keyboard or barcode reader.

10 Switch to the next input field with [Next]. Complete the input with 82.

11 Use [Open] to start the automatic storing.9 appears on the display.

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5 Select the Close menu item with 82.

6 Confirm the Close menu item with g.The automatic storing function is terminated.Recorded measuring data remain in the memory.The 9 display indicator is no longer displayed.

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11.1.3 Displaying stored measurement data records

You can display measured values that have been stored automatically or manually. Data from the AutoStore memory can be displayed as a graph or in tabular form. Data from the manual measurement data record memory can only be displayed numerically.

Displayingautomatically stored

measurement datarecords

graphically



3 Select the AutStoGrph menu item with 82.

4 Confirm the AutStoGrph menu item with g.


6 Confirm the Open menu item with g.

7 Select a memory location, e.g. Mem 1, with 82.

8 Confirm the selected storage location with g.The AutoStoGrph Mem 1 input window is open.

9 Select an available parameter pH, Oxi or Cond (here, e.g. pH) with 82.

10 Confirm the selected parameter with [Open].The content of the storage location is displayed in the form of a graph.

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Zoominga sector

(zoom function)

NoteYou can zoom up to three times in a sequence and undo each zooming.

Undoing thezoom function

Terminatingthe graphical

display

1 Display the upper left-hand corner of the required sector with g.

2 Position the corner with 4682.

3 Confirm the upper left-hand corner of the required sector and display the lower right-hand corner of the required sector with g.

4 Position the corner with 4682.

5 Confirm the selected display sector with g.The display shows the new sector.

6 Use g and [Tab] to undo the last zoom function.The sector before the last zooming is displayed again.



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Displayingmeasurement data

recordsnumerically

With the following function you can output manually stored individual data records or AutoStore data to the display. Filters help you to select individual data records according to the following criteria:

Number of the storage location (Mem No.)

Identification (ID)

Date and time of storing

3 Select the AutStoGrph menu item with 82.

4 Confirm the AutStoGrph menu item with g.


6 Confirm the Close menu item with g.The graphical display is terminated.

1 Use r to call up the manual measurement data record memory (man mem).The first data record that meets the selected criterion is displayed.

2 Call up further measurement data record memory with r.The measurement data record memory locations are called up in the order, Mem man - Mem auto 1 - 2 - 3 - 4.

3 Call up the RCL menu with [RCL menu].

4 Select the RCL filter menu item with 82.

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NoteIf there are large amounts of data, you may have to wait for a few seconds until a data record is displayed.

5 Confirm the RCL filter menu item with g.The RCL filter input window is open.

6 Use 82 to switch a filter, e. g. Mem No., on or off (on/off).

7 Switch to the next input field with [Next]. Complete all inputs.


9 Increase/reduce values or switch a filter on/off with 82.

10 Close the input window with [ESC].The first data record meeting the selected criterion is displayed.

11 Swap between the data records meeting the selected filter criterion with 82.

12 Terminate the storage display with [ESC].

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11.1.4 Deleting stored measurement data records

Deleting automaticallystored measurement

data records

Using the following function, you can delete the contents of the AutoStore storage locations, Mem 1 to Mem 4.

NoteYou can cancel the delete process with [ESC].





5 Select the Clear menu item with 82.

6 Confirm the Clear menu item with g.

7 Select a memory location, e.g. Mem 1, with 82.

8 Confirm the selected memory with g.A security prompt appears on the display.

9 Select yes with [Next].

10 Confirm the delete with g.The measurement data record memory is deleted.

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Deleting themanual

measurement datarecord memory

The memory for individual, manual stored measurement data records can be deleted as a whole.

NoteYou can cancel the delete process with [ESC].



3 Select the Mem man menu item with 82.

4 Confirm the Mem man menu item with g.


6 Confirm the Clear menu item with g.A security prompt appears on the display.


8 Confirm the delete with g.The manual measurement data record memory is deleted.

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11.2 Storage of system configurations

Up to 4 different system configurations can be managed (store, recall, delete and print) by the inoLab 740. This can then be helpful, e.g. if several persons are using the same measuring system, or different measurement tasks require different settings.

11.2.1 Saving the system configuration

When storing the system configuration, you store all the current settings for all probes.

1 Switch to the Menu mode with [Menu].


3 Use 82 to select the Settings menu item.

4 Use g to confirm the Settings menu item.

5 Select the Save menu item with 82.

6 Confirm the Save menu item with g.

7 Use 82 to select a free storage location, Setting-1 ... -4.Free storage locations are displayed in black, occupied storage locations are gray.

8 Confirm the storing with g.The stored data are displayed.

9 Save the data with [OK].

10 Terminate saving with [ESC].

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11.2.2 Recalling a system configuration

You can recall system configurations that you have stored yourself or the default setting as follows:







7 Select a Current, Basic sett. or Sett.-1 ... 4 memory location with 82.Occupied storage locations are displayed in black, free storage locations are gray.

8 Call up the selected storage location with g.The settings are displayed.

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11.2.3 Deleting a system configuration

With this function, you can delete system configurations that you have stored yourself. The default settings always remain stored.

9 Call up the selected setting with [OK].If Current was selected: Display the current settingsIf Default was selected: Use default settingIf Setting 1-4 was selected: open the stored setting 1 ... 4.A security prompt appears.


11 Confirm the selection with g.The user profile is taken as the current setting.







6 Confirm the Clear menu item with g.

7 Select a Settings 1 ... 4 memory location with 82.

8 Delete the system configuration with g.A security prompt appears before it is deleted.


10 Confirm the delete with g.The user profile is deleted.

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11.3 Storage of calibration records

The following calibration results are automatically stored in a record during each calibration:

Calibrating for pH/ISE and D. O. measurements

Determination of the cell constant of conductivity measuring cells.

The text displayed on the calibration protocol shows the calibration data for all measured variables as continuous text. You can recall the data of the last calibration/determination at any time:



3 Using 82 select the Cal. Prot... menu item.

4 Use g to confirm the Cal. Prot... menu item.The Cal. records window opens.The first page of the calibration records is displayed.

5 Scroll through the display text with 2.

6 Scroll through the display text with 82.

7 Terminate the Menu mode with [ESC].

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inoLab 740 Data output

12 Data output

The inoLab 740 terminal provides several options for ouputting data.

Output to the display (Displaying measured values)

– numerical display of measured values (standard)

– graphical display of measured values (digital recorder)

Output to the integrated printer(on terminals with integrated printer only)

– printing graphical and numerical data

– printing on the digital recorder

Output to the RS 232/REC interface

– printing numerical data on an external printer

– transmitting data to a PC, e.g. to be saved in a database

– recording the data via an external analog recorder

You can output the following data:

Graphical displays

Alphanumerical displays

– Calibration records

– Stored measured values

– Stored system configurations

Alphanumerical data can be output as a legible text or database-conform (data list separated by semicolons).

You can start the data output to the integrated printer or the RS232 interface as follows:

Manually

– by pressing the p softkey:prints, e.g. the current measured value or the current calibration protocol

– by pressing the g key on the measuring module:prints the current measured value(precondition: the AutoRead function is not active)

– by selecting Print in the menu: prints, e.g. the system configuration or selected elements of a data memory

Automatically

– by selecting Print in the menu:prints, e.g. the recording on the digital recorder

– after each AutoRead measurement with a stable measured value

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Data output inoLab 740

– each time a measured value is stored if AutoStore is active (9 flashes)

– after each calibration when the calibration record is output

12.1 Data output to the display

The current measured value can be displayed numerically or graphically. The numerical display of measured values is the default setting. The graphical representation of a selected measured variable is activated via the digital recorder.

12.1.1 Numerical display

The numerical display of measured values is the default display. The current measured value is displayed continuously. The numerical display looks as follows (example):

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12.1.2 Graphical display

The digital recorder continuously records measured values and depicts them graphically with respect to time (vertical axis) on the display. In the graphical display the cursor (+) moves from the top to the bottom. The measured value is also displayed numerically (here, e.g. 6.410 pH) at the same time.

If the digital recorder is started, you are moved first to the Recorder input window to define the details of the graphical display.

Center (1) determines the center of the measured value range (here 7.000).

Delta (2) determines the extension of the measured value range starting from the center (here Center ± Delta gives a range of pH 0.000 to 14.000).

Timebase (3) defines the length of the time intervals (5, 6) shown on the display; the duration is also displayed on the recorder strip (8)

Digits (4) determines the number of the digits after the decimal point

When the first period has expired, the recording of the current period is displayed in the lower half (6) and the previous period is displayed in the upper half (5).

NoteThe current measured values are not stored.

Input window Graphical display

12

34

6

5

7

8

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Starting the digitalrecorder

When starting the digital recorder, you can make settings that define the graphical display and the recording of the measured values.



3 Using 82, select the Dig. Rec menu item.

4 Using g, confirm the Dig. Rec menu item.



7 Use 82 to select one of the menu items, pH, Oxi, or Cond.

8 Confirm the selected menu item with g. The Recorder input field appears on the display.

9 Option:Move between the individual digits with 46.

10 Increase or decrease the value with 82.

11 Move to the next input field with [Next].

12 Complete all inputs.

13 Confirm the input and start the digital recorder with [Open]orquit without starting the recorder with [ESC].

14 Option:Switch to the numerical display with [Tab].

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Reducing themeasuring range

limits(zoom function)

Undoing thezoom function

15 Display the left-hand measuring range limit with g.

16 Change the left-hand measuring range limit with 46.

17 Determine the left-hand measuring range limit and display the right-hand measuring range limit with g.

18 Change the right-hand measuring range limit with 46.

19 Determine the right-hand measuring range limit with g.The measuring range limits show the new values.

20 Undo the zoom function with g and [Tab].The sector determined in the Recorder input window appears on the display again.

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Terminating the digitalrecorder






6 Confirm the Close menu item with g.The digital recording is terminated.

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12.2 Outputting data to the integrated printer

12.2.1 General information

The integrated printer is operated via the o key (switched on/off) and the f key (manual line feed) on the terminal.

The operating status of the printer is indicated by the print LED on the terminal.

Green LED: printer ready for operation

Red LED: printer off or malfunction

To print on the integrated printer, the following conditions must be fulfilled:

The integrated printer must be switched on and ready for operation (print LED lights up green, see section 12.2.2),

The data output is set to the integrated printer (see section 12.2.3),

A manual or automatic print job must have been given (section 12.2.4),

NoteFor troublefree operation of the integrated printer, we recommend disconnecting any other devices from the RS232/REC interface.

It is not possible to operate the integrated printer and external devices (printer, PC, or analog recorder) on the RS232/REC interface at the same time.

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12.2.2 Switching on the integrated printer

It is only possible to print with the integrated printer if the printer has been switched on.

NoteLine feed with f is only possible when the integrated printer has been switched off (the print LED lights up red).

12.2.3 Data output to the integrated printer

Data is either output to the integrated printer or to the RS232 interface. You can select where to output the data in the Opt menu.

12.2.4 Printing

Printing the display When the p softkey function is shown on the display you can always print the current display. Use the p softkey to print the following data:

The data record of the current measured value

The data record of a stored measured value

The graphical representation of a measured data series stored with AutoStore (only on the integrated printer)

Calibration records

1 Switch on the printer with o.The print LED lights up green.The printer is ready for operation.



3 Select the Int. Prn menu item with 82.

4 Confirm the Int. Prn menu item with g.The data output is switched to the integrated printer (✔).


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You can also start a printout of the current numerical data record on the measuring module.Precondition: AutoRead is not active.

Printingstored

data records

If there are stored measured values, you can display and print them.

1 Start the printout of the currently displayed numerical or graphical data with p.

1 Start the printout of the currently displayed numerical data with g.


2 Switch to the storage display with r.

3 Call up the RCL menu with [RCL menu].

4 Option:Determine the selection criteria for the data in the RCL filter input window (see section 11.1.3)

5 Select the Print all menu item with 82.

6 Confirm the Print all menu item with g.All data records meeting the selection criteria in the RCL filter input window are printed.

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Printing thedisplay of the

digital recorder

If the digital recorder is switched on, the graphical representation of the measured values is also output on the integrated printer at the same time.Precondition: The printer is on (green LED) and the output is switched to the integrated printer (see section 12.2.1).

Switching offthe printout of the

digitalrecorder

The printout of the digital recorder can be switched off without terminating the digital recorder.





5 Select the Print menu item with 82.

6 Confirm the Print menu item with g.Print is active (✔). The recorder strip is printed out as long as the Print menu item is active (✔).





5 Select the Print ✔ menu item with 82.

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Selecting theprint quality

You can select the quality of the printout in the menu:

Draft:Not such a high print quality (prints more quickly)

LQ:Higher print quality (prints more slowly)

6 Confirm the Print ✔ menu item with g.Print is switched off. The recorder printout is discontinued, but the screen display of the recorder continues to run.



3 Select the RS232/Prt menu item with 82.

4 Confirm the RS232/Prt menu item with g.

5 Select the Prt font menu item with 82.

6 Confirm the Prt font menu item with g.

7 Select the LQ or Draft menu item with 82.

8 Confirm the selected menu item with g.The printing quality has been set.

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12.3 Outputting data to an external printer/PC

Via the RS 232 interface on the terminal, you can transmit the data to a PC or an external printer. Connect the interface to the devices via the AK T-PC (PC) or AK T-9PIN/25PIN (ext. printer) cable. The data output automatically switches to the RS232 interface.

WarningIf a grounded PC/printer is connected, you can also measure in grounded media.

Set up the following transmission data on the PC/printer:

Socket assignment

Baud rate can be selected from: 1200, 2400, 4800, 9600

Handshake RTS/CTS + Xon/Xoff

Parity none

Data bits 8

Stop bits 1

1 RTS2 RxD3 TxD4 DTR

RS 232REC

1

3

4

5

62

5 SG6 CTS

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12.3.1 Outputting data to the RS232/REC interface

To output data to an external printer/PC, the data output must be switched to the RS232/REC interface.

12.3.2 Setting the baud rate

The baud rate for the RS232/REC interface must be the same as the baud rate of the connected devices.



3 Select the RS232 menu item with 82.

4 Confirm the RS232 menu item with g.The data is output to the RS232/REC interface (✔).






5 Select the Baudrate menu item with 82.

6 Confirm the Baudrate menu item with g.

7 Use 82 to select the required baud rate 1200, 2400, 4800 or 9600.

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12.3.3 Determining the data format

You can determine the form in which the numerical data is sent to the RS232/REC interface. The selection of the data format type determines the data transmission:

ASCIIthe data is transmitted in the same form as it is displayed:recommended for external printers on the RS232/REC interface

DataThe data is transmitted with separators. The data can easily be saved in a database if it is transmitted to a PC.

8 Confirm the selected baud rate with g.The selected baud rate is active (✔).






5 Select the Datformat menu item with 82.

6 Confirm the Datformat menu item with g.

7 Select the Ascii or Data menu item with 82.

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Data format In the Data format, all data is output in a fixed sequence and separated by semicolons (;).

If you output more than one data memory location in the RCL menu, a header designating the individual data columns is automatically output.

Data output in the data format with the header:

Printing theheader

You can also print the header separately.

8 Confirm the selected menu item with g. The selected data format is active (✔).


Data records

Header





5 Select the Datformat menu item with 82.

6 Confirm the Datformat menu item with g.

7 Select the Header menu item with 82.

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12.3.4 Setting the print interval

The print interval sets the time period between the transmission of measured values to the interface.

8 Confirm the Header menu item with g. The labeling of the data in the data format Data is output (e.g. on a printer or the PC).






5 Use 82 to select the Prt Int. ... menu item.

6 Use g to confirm the Prt Int. ... menu item. The Print interval window appears on the display.

7 Switch the internal printer on or off (on / off) with 82.

8 Go to the fields for the print interval (Interval) and the time unit for the print interval (Unit) with [Next]. Complete the entries.

9 Increase or decrease the value with 82.

10 Go to the fields for the print interval (Interval) and the time unit for the print interval (Unit) with [Next]. Complete the entries.

11 Select the required inputs with 82.

12 Confirm the settings with g.

13 Terminate the input with [ESC].

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12.3.5 Outputting data to an external printer or PC

In order to transmit data to an external printer or PC, follow the settings in the RS232/Prt menu.

Connecting theexternal printer/PC

inoLab 740 allows an external printer to be run on the RS232/REC interface.

Connect the external printer to the RS232/REC interface.

Printing/transmitting data to the

PC

Printing or transmitting data to a PC is the same as for the integrated printer (see chapter 12 DATA OUTPUT).

NoteIn order to store the data in a file on the PC, a terminal program is required that can continuously store the received data.

12.4 Outputting data to the external recorder

To record measured values graphically, you can also connect an analog external recorder to the RS232/REC interface to the terminal.

NoteBefore recording measured values with the external recorder, please observe the following points:

Switch off AutoRange (automatic measuring range switch-over),

Set the measuring range manually(tables with the possible measuring ranges can be found in chapter 15 TECHNICAL DATA, section 15.1 TERMINAL),

Switch the data output to the RS232/REC interface,

Select the measured variable to be recorded in the menu.

Selecting the measuredvariable to be recorded

As soon as the data output is directed to the RS232/REC interface and the measured variable to be recorded is selected, the corresponding voltage is output on the RS232/REC interface.



3 Use 82 to select the Ana. Rec menu item.

4 Use g to confirm the Ana. Rec menu item.

5 Select the measured variable to be recorded with 82.

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NoteAdditional settings can be made on the recorder itself.

6 Confirm the selected measured variable with g.The selected measured variable is active (✔).

7 Terminate the Menu mode with m.The voltage corresponding to the selected measured variable is output on the interface.

8 Switch on the recorder.

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inoLab 740 Maintenance, cleaning, disposal

13 Maintenance, cleaning, disposal

13.1 Maintenance

The measuring system is almost maintenance-free.The only maintenance task is replacing the batteries of the terminal.

13.1.1 Replacing the batteries

NoteThe batteries buffer the internal real time clock. When the batteries are changed, no data except for the date and time are lost.

CautionMake sure that the poles of the batteries are the right way round.The ± signs on the batteries must correspond to the ± signs in the battery compartment. Only use leakproof alkaline manganese batteries.

1 Open the battery compartment (1) on the underside of the instrument.

2 Remove the two batteries from the battery compartment.

3 Place two new batteries (type Mignon AA) in the battery compartment.

4 Close the battery compartment (1).

5 Set the date and time according to section 5.1.

1

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Maintenance, cleaning, disposal inoLab 740

13.1.2 Changing the roll of paper

For the terminal with integrated printer.

NoteOnly use original WTW rolls of paper. You will find information on this in the WTW catalog LABORATORY AND FIELD INFORMATION or via the Internet.You can also use Thermopaper HQ that can be read for at least 10 years.

13.1.3 Maintenance of the probes

NoteSee the relevant operating manuals of the probes for instructions on maintenance.

1 Switch the printer off (print LED lights up red).

2 Open the lid of the printer (1).

3 Remove the empty roll of paper (2).

4 Insert the new roll of paper:

– Fold the start of the roll of paper inwards and thread it into the printer (3) from below.

– Press the print key f (paper feed).

5 Close the lid of the printer (1).

1

2

3

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inoLab 740 Maintenance, cleaning, disposal

13.2 Cleaning

Occasionally wipe the outside of the terminal and measuring module with a damp, lint-free cloth. Disinfect the housing with isopropanol as required.

CautionThe housing is made of a synthetic material (ABS). Thus, avoid contact with acetone or similar detergents that contain solvents. Remove any splashes immediately.

13.3 Disposal

Packing This measuring system is sent out in a protective transport packing. We recommend: Keep the packing material. The original packing protects the instrument against damage during transport.

Batteries This note refers to the battery regulation that applies in the Federal Republic of Germany. We would ask end-consumers in other countries to follow their local statutory provisions.

NoteIn compliance with §14 BATTERY REGULATION, we would like to point out that this instrument contains batteries. Batteries that have been removed must only be disposed of at the recycling facility set up for this purpose or via the retail outlet. It is illegal to dispose of them in household refuse.

TerminalMeasuring module

Dispose of the measuring instrument as electronic waste at an appropriate collection point. It is illegal to dispose of the instrument in household refuse.

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Maintenance, cleaning, disposal inoLab 740

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inoLab 740 What to do if...

14 What to do if...

System messages due to errors are listed together with their possible causes and remedies.

14.1 Terminal messages

Probe symbol flashes

Instrument does notreact to keystroke

h flashes continuously

Cause Remedy

– Calibration interval expired – Recalibrate the measuring system

Cause Remedy

– Operating state undefined or electromagnetic interference too high

– Processor reset:Unplug the plug-in power supply and plug it in again (if it occurs repeatedly, ensure the electromagnetic radiation is reduced)

Cause Remedy

No stable measured value Provide stable measuring conditions (e.g. temperature)

Defective probe Use another probe

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What to do if... inoLab 740

14.2 Printer messages

For the terminal with integrated printer.

Integrated printer doesnot print

Printer operating - papernot being printed

Integrated printer printsautomatically

Feed key f does notreact

Cause Remedy

– Printer switched off – Switch on the printer

– Interface cable connected – Disconnect cable

– No paper available – Replace roll of paper

– AutoStore functionis switched on with a long interval time (Int 1)

– Switch off AutoStore

– The integrated printer is not selected in the Opt menu

– Select and confirm Prn. int in the Opt menu

Cause Remedy

– Paper inserted the wrong way up

– Turn the roll of paper around and insert it with the other side upwards

Cause Remedy

– AutoStore function or data transmission is switched on

– Switch off the function

Cause Remedy

– Printer switched on – Switch printer off

– Interface cable connected – Disconnect cable

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14.3 pH/voltage system messages


Error messageOFL

Error messageE3

Cause Remedy

pH/voltage, electrode:

– Not connected – Connect electrode

– Air bubble in front of the diaphragm

– Remove air bubble

– Air in the diaphragm – Extract air or moisten diaphragm

– Cable broken – Replace electrode

– Gel electrolyte dried out – Replace electrode

Cause Remedy

pH/ORP electrode:

– Diaphragm contaminated – Clean diaphragm

– Membrane contaminated – Clean membrane

– Moisture in the plug – Dry plug

– Electrolyte out of date – Replenish electrolyte or replace electrode

– Electrode worn out – Replace electrode

– pH electrode: broken – Replace electrode

– ORP electrode: short-circuit – Replace electrode

Cause Remedy

Measuring system:

– Incorrect calibration procedure – Select correct procedure

– Incorrect solution temperature(without temperature probe)

– Set up correct temperature

– Socket damp – Dry socket

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No stablemeasured value

Obviously incorrectmeasured values

Buffer solutions

– Incorrect buffer solutions – Change calibration procedure

– Buffer solutions too old – Use only once.Note the shelf life

– Buffer solutions depleted – Change solutions

Cause Remedy

pH/ORP electrode:

– Diaphragm contaminated – Clean diaphragm


Test sample:

– pH value not stable – Measure with air excluded if necessary

– Temperature not stable – Adjust temperature if necessary

Electrode + test sample:

– Conductivity too low – Use suitable electrode

– Temperature too high – Use suitable electrode

– Organic liquids – Use suitable electrode

Cause Remedy

– pH electrode unsuitable – Use suitable electrode

– Temperature difference between buffer and test sample too high

– Adjust temperature of buffers or sample

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14.4 Ion concentration system messages


Error messageOFL

Error messageE3

Cause Remedy

Ion-sensitive electrode or reference electrode

– Not connected – Connect electrode

– Cable broken – Replace electrode

– Measured value outside the measuring range

– Select another measuring range or Activate AutoRange (see section 7.1.3)

Cause Remedy

Ion-sensitive electrode:

– Slope is not in the range 50 ... 70 mV or23 ... 35 mV

– Replace electrode

– Recalibrate

– Moisture in the plug – Dry plug

– Electrode obsolete – Replace electrode

– Measurement in a range for which the cell is not suitable

– Use a suitable electrode

Measuring instrument:

– Calibration procedure: Wrong sequence of standards for three point calibration

– Select correct sequence

– Socket damp – Dry socket

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ISE temp?

ISE limit?

no std

Cause Remedy

During calibration:

– Calibration standards do not have the correct temperature (max. ± 2 °C temperature difference)

– Adjust the temperature of the calibration standards

During measurement:

– Test sample does not have the correct temperature (max. ± 2 °C temperature difference from calibration temperature)

– Adjust the temperature of the test sample

Cause Remedy

During calibration:

– Calibration standards are too close to each otherIU2 - U1I ≤ 5 mVIU3 - U2I ≤ 5 mV

– Use other calibration standards

During measurement:

– Measured value is outside the calibration limits

– Recalibrate with suitable calibration standards as necessary

Cause Remedy

After two-point calibration:

– The highest or lowest calibration standard was used as the second calibration solution.

– Cancel the calibration (the present two-point calibration is retained)

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14.5 Oxygen system messages

Measuring modules for the inoLab 740: pH, BSB/BOD and Multi.

Error messageOFL

Error messageE3

Error messageE7

DisplayStirrerError

Cause Remedy

Display range exceeded

– Not connected – Connect the probe

– Cable broken – Replace probe

– Depleted – Replace probe

– Short-circuit between gold and lead electrode

– Clean probe and replace it if necessary

Cause Remedy

Invalid calibration

– Electrolyte solution depleted – Regenerate probe


– Electrode system poisoned – Regenerate probe

– Worn out – Replace probe

– broken – Replace probe

Cause Remedy

Membrane damaged

– Membrane damaged – Regenerate probe

– Membrane head not screwed on tight enough

– Screw membrane head tight

Cause Remedy

– Stirrer mechanically blocked or defective

– Eliminate the blocking or disconnect the defective stirrer

– Disconnect, then reconnect mains plug

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Measured value too low

Measured value toohigh

Cause Remedy

– Insufficient flow – Provide flow to the probe

Cause Remedy

– High amount of dissolved substances

– Correct solubility function using the salinity equivalent

– Air bubbles bump on the membrane with high velocity

– Avoid direct flow to the membrane

– The carbon dioxide pressure is too high (> 1 bar)

– Measuring not possible

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14.6 Conductivity system messages

Measuring modules for the inoLab 740: Cond, pH/Cond and Multi.

Error messageOFL

Error messageE3

Cause Remedy

– Measuring cell not connected – Connect measuring cell

– Cable broken – Replace measuring cell

– The measured value is outside the measuring range

Cause Remedy

– Measuring cell contaminated – Clean cell and replace it if necessary

– Calibration solution not suitable – Check calibration solutions

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inoLab 740 Technical data

15 Technical data

NoteThe technical data specified here apply to the measuring system consisting of terminal and measuring module. The technical data of the probes are not taken into consideration here.

Ambient conditions

Mechanical structure

Electrical safety

Applicableguidelines and norms

Storage - 25 °C ... + 65 °C

Operation 0 °C ... + 40 °C

Allowable relative humidity

Yearly mean: < 75 %30 days/year: 95 % Other days: 85 %

Type of protection IP 43 without built-in printer

Protective class III

EMC EEC guideline 89/336/EWGEN 61326-1:1997EN 61000-3-2 A14:2000EN 61000-3-3:1995FCC Class A

Instrument safety EEC guideline 73/23/EWG

EN 61010-1 A2:1995

Climatic class VDI/VDE 3540

Type of protection EN 60529:1991

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Technical data inoLab 740

Test certificates

FCC Class A Equipment Statement

Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

UL/CUL, CE

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15.1 Terminal

Dimensionsand weight

Power supply

Serial interface Automatic switchover between serial output and analog output (recorder) with connection of the cable, AK T-PC or AK T-9PIN/25PIN.

Only in models with printer:The serial output can be redirected to the internal printer using software.

Length [mm] 250

Width [mm] 300

Height [mm] 70

Weight [kg]with printerwithout printer

approx. 1.6 (without plug-in power supply)approx. 1.3 (without plug-in power supply)

Mains Connection max. Overvoltage category II

Plug-in power supply unitFRIWO FW7555M/09, 15.1432Friwo Part. No. 1822089Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mAOutput: 9 V = / 1,5 A

Batteries(to buffer the real time clock)

2 x 1.5 V AA type alkaline manganese batteries

Type RS 232, bi-directional

Data bits 8

Baud rate Selectable 1200, 2400, 4800, 9600 Baud

Stop bit 2

Parity None

Handshake RTS/CTS

Cable length Max. 15m

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Measuring moduleinterface

The power supply of the measuring module is fed via the interface (Technical Data, see section 15.2).

PC keyboard interface Connection via the terminal/PS2 adapter

Analog output Automatic switchover between the serial output and analog recorder output with connection of the cable, AK T-R 2ST.

Type RS 232

Data bits 8

Baud rate 4800 Baud

Stop bit 1

Parity None

Handshake Xon/Xoff

Cable length Max. 15m

Voltage 5V ± 10%

Current Max. 200 mA

Accuracy The following is valid for all recorder output voltages:± 0.5% of the corresponding display value ± 0.5 mV

Internal resistance

< 5 Ω (current limit of max. 0.2 mA output current)

Measuring range Recorder output voltage

pH -2.000 ... +19.999 -0.200 ... 1.999 V

U -999.9 ... +999.9 mV-1.999 ... +1.999V

-999.9 ... +999.9 mV-1.999 ... +1.999V

ISE 0 ... 1.999 *0 ... 19.99 *0 ... 199.9 *0 ... 1999 *

* The PT 1000 temperature sensor can only be operated with the inoLab pH 740 and pH/ION 740 measuring modules.

0 ... 1.999V0 ... 1.999V0 ... 1.999V0 ... 1.999V

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Oxi

Saturation 0 ... 199.9%0 ... 600%

0 ... 1.999V0 ... 0.600V

Concentration 0 ... 20.00 mg/l0 ... 100.0 mg/l

0 ... 2.000V0 ... 1.000V

Partial pressure 0 ... 199.9 mbar0 ... 1250 mbar

0 ... 1.999V0 ... 1.250V


Cond

Conductivity 0 ... 1.999 µS/cm0 ... 19.99 µS/cm0 ... 199.9 µS/cm0 ... 1999 µS/cm0 ... 19.99 mS/cm0 ... 199.9 mS/cm0 ... 500 mS/cm

0 ... 1.999 V0 ... 1.999 V0 ... 1.999 V0 ... 1.999 V0 ... 1.999 V0 ... 1.999 V0 ... 0.500 V

TDS 0 ... 1999 mg/l 0 ... 1.999V

Salinity 0 ... 70.0 0 ... 0.700V

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15.2 Measuring module

NoteThe technical data in this chapter include all variants of the inoLab 740 measuring modules. Each of the measuring modules to which the technical data of a section apply are listed at the start of the section.

Dimensions and weight

Power supply The power is supplied via the serial connection cable from the terminal.

Length [mm] 300

Width [mm] 100

Height [mm] (without stand)(with stand)

170500

Weight [kg] Approx. 1.3

Voltage 5 V ± 10%

Current Max. 500 mA

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15.3 pH/electromotive force of the electrode:


NoteThe technical data of the electrodes are not taken into consideration here.

General information

Measuring ranges andresolution

Input resistance 5 x 1012 Ω

Input current Typically 5 x 10-13 A < 5 x 10-12 A at 25°C

Slope (pH) -62 ... -50 mV

Asymmetry (pH) -30 ... +30 mV

pH

Measuring range 1 (Resolution) - 2.000 ... + 19.999 (0.01)


Electromotive force U [mV]


Measuring range 2 (Resolution) - 1999 ... + 1999 (1)

Temperature

T [°C] (Resolution) - 5.0 ... + 105.0 (0.1)

T [°F] (Resolution) + 23.0 ... + 221.0 (0.1)

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Accuracy(± 1 digit)

Temperature input

Electrodes& accessories

Information on electrodes and other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or via the Internet.

pH

Measuring range 1Measuring range 2

± 0.004 at + 15 °C ... + 35 °C± 0.01

Electromotive force U [mV]

Measuring range 1Measuring range 2

± 0.2 at + 15 °C ... + 35 °C± 1

Temperature

T [°C] NTC 30: ± 0.1

PT 1000*:± 0.5 at 0 °C ... 15 °C ± 0.1 at 15 °C ... 35 °C± 1 at 35 °C ... 55 °C

* The PT 1000 temperature sensor can only be operated with the inoLab pH 740 and pH/ION 740 measuring modules.

T [°F] NTC 30: ± 0.2

PT 1000*:± 0.9 at 32 °F ... 59 °F ± 0.2 at 59 °F ... 95 °F± 1.8 at 95 °F ... 131 °F

Manually [°C] - 20 ... + 130

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15.4 Ion concentration


NoteThe technical data of the electrodes are not taken into consideration here.

General information


Electrodes& accessories

Information on electrodes and other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or via the Internet.

Input resistance 5 x 1012 Ω

Input current Typically 5 x 10-13 A < 5 x 10-12 A at 25°C

Slope ranges ± 25 to 35 mV and 50 to 70 mV






Temperature

T [°C] (Resolution) - 5.0 ... + 105.0 (0.1)

T [°F] (Resolution) + 23.0 ... + 221.0 (0.1)

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15.5 Dissolved oxygen

For the inoLab 740 measuring modules: Oxi, BSB/BOD and Multi.

NoteThe technical data of the probes are not taken into consideration here.



Measuring range 1 (Resolution) 0 ... 19.99 (0.01)


Saturation [%]

Measuring range 1 (Resolution) 0 ... 199.9 (0.1 )


D. O. partial pressure [mbar]



Temperature

T [°C] (Resolution) 0.0 ... 50.0 (0.1)

T [°F] (Resolution) + 32.0 ... + 122.0 (0.1)

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Correction functions

Probes& accessories

Information on probes and other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or via the Internet (http://www.com).

Concentration

± 0.5 % of the measured valueat an ambient temperature of 5 °C ... 30 °C

Temperature compensation

< 2 % at 0 ... 40 °C

Saturation

± 0.5 % of the measured valuewhen measuring in the range of ± 10 K around the calibration temperature


± 0.5 % of the measured valueat an ambient temperature of 5 °C ... 30 °C

Temperature

T [°C] ± 0.1

T [°F] ± 0.2

Salinity correction 0 ... 70.0 SAL

Air pressure correction

Automatically using the built-in pressure probe in the range 500 ... 1100 mbar

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15.6 Conductivity

For the inoLab 740 measuring modules: Cond, pH/Cond and Multi.

NoteThe technical data of the measuring cells are not taken into consideration here.


Conductivity [µS/cm]

Measuring range 1 (Resolution)

0.000 ... 1.999 (0.001)(at a cell const. = 0.01 cm-1)


0.00 ... 19.99 (0.01)(at a cell const. = 0.01 cm-1 or 0.090 ... 0.110 cm-1)


0.0 ... 199.9 (0.1)


0 ... 1999 (1)

Conductivity [mS/cm]


0.00 ... 19.99 (0.01)


0.0 ... 199.9 (0.1)


0 ... 1999 (1)

Specific resistance [MΩcm]


0.000 ... 1.999 (0.001)


0.00 ... 19.99 (0.01)


0.0 ... 199.9 (0.1)


0 ... 1999 (1)

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Salinity equivalents according to the IOT table

SAL 0.0 ... 70.0

Total dissolved solids TDS [mg/l]

Measuring range (Resolution)Adjustable factor

0 ... 1999 (1)0.0 ... 1.0

Temperature

T [°C] (Resolution) − 5.0 ... + 105.0 (0.1)

T [°F] (Resolution) + 23.0 ... + 221.0 (0.1)

Conductivity, specific resistance

No temperature compensation

± 0.5 %

Nonlinear temperature compensation

± 0. % (at 0 °C ... 35 °C acc. to EN 27 888)± 0. %(at 35 °C ... 50 °C extended nLF func. acc. to WTW measurements

Linear temperature compensation

± 0.5 % 10 °C ... 75 °C(the percentage of the precision always refers to the meas. value!)

Salinity equivalent SAL

Range0.0 ... 42.0

± 0.1 (at 5 °C ... 25 °C)± 0.2 (at 25 °C ... 30 °C)

Total dissolved solids TDS [mg/l]

± 1

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Cell constant,to select

Cell constant,calibrating

Reference temp.,selectable

Measuring cells& accessories

Information on measuring cells and other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or via the Internet.

Temperature

T [°C] NTC 30: Accuracy ± 0.1

PT 1000*Accuracy Operating temperature± 0.50 °C ... 15 °C± 0.1 15 °C ... 35 °C± 1 35 °C ... 55 °C

* The PT 1000 temperature sensor can only be operated with the inoLab Cond 740 measuring module.

T [°F] NTC 30: Accuracy ± 0.2

PT 1000*:Accuracy Operating temperature± 0.9 at 32 °F ... 59 °F ± 0.2 59 °F ... 95 °F± 1.8 95 °F ... 131 °F

C [cm-1] 0.010.090 ... 0.1100.250 ... 2.500

C [cm-1] 0.450 ... 0.5000.800 ... 1.200

TREF [°C] 2025

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inoLab 740 Lists

16 Lists

This chapter provides additional information and orientation aids.

Abbreviations The list of abbreviations explains the indicators and the abbreviations that appear on the display and in the manual.

Specialist terms The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here.

Index The index will help you to find the topics that you are looking for.

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16.1 Abbreviations

Conductivity value (international γ)

AR AutoRead (drift control)

ARng Automatic range switchingMeasuring instrument measures with highest resolution

ASY Asymmetry

AutoCal DIN Automatic pH calibration with buffer solutions prepared according to DIN 19 266

AutoCal TEC Automatic pH calibration with WTW technical buffer solutions according to DIN 19267

C Cell constant [cm-1] (internat. k)

°C Temperature unit, degrees Celsius

Cal Calibration

Cd... Display indicator during calibration for pH measurements. Indicates the selection of the buffer data record for buffer solutions prepared according to DIN 19 266

Cm... Display indicator during calibration for pH measurements. Indicates the selection of buffer data records for buffer solutions of the Merck company

ConCal Conventional single-point or two-point calibration for pH measurements

Ct... Display indicator during calibration for pH measurements. Indicates the selection of the buffer data records for WTW technical buffer solutions

E3 Error message See chapter 14 WHAT TO DO IF...

°F Temperature unit, degrees Fahrenheit

ISECal Calibrating for ion-sensitive measurements

Lin Linear temperature compensation

LoBat Batteries almost empty(Low Battery)

mV Voltage unit

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mV/pH Unit of the electrode slope (internat. mV)

nLF Nonlinear temperature compensation

OFL Display range exceeded (Overflow)

OxiCal Automatic calibration for D. O. measurements

pH pH value

S Slope (internat. k)

SAL Salinity

SELV Safety Extra Low Voltage

SLO Slope setting on calibration

TC Temperature coefficient (internat. α)

TDS Total Dissolved Solids

TP Temperature measurement active (Temperature Probe)

TRef 20/T20 Reference temperature of 20 °C

TRef 25/T25 Reference temperature of 25 °C

UASY Asymmetry

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16.2 Glossary

Activity The activity corresponds to the effective concentration. Due to a reciprocal interaction, the effect of ions, e.g. in electrochemical processes, deviates from the expected theoretical value. The activity of ions in small to medium concentrations (< 1 mol/kg) is less than their concentration. The relationship between the activity a and the concentration c is expressed by the equation: ai = fi x ci .

Adjusting To manipulate a measuring system so that the relevant value (e. g. the displayed value) differs as little as possible from the correct value or a value that is regarded as correct, or that the difference remains within the tolerance.

Amperometry Name of a measuring technique. The signal (depending on the measured parameter) of the probe is the electric current. The electrical voltage remains constant.

Asymmetry Designation for the offset potential of a pH electrode. It is the measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point (WTW electrodes: pH = 7).

AutoRange Name of the automatic selection of the measuring range.

AutoRead WTW name for a function to check the stability of the measured value.

Blank value Designation for the oxygen consumption of the BOD of the dilution water.

The determination of the blank value is required to calculate the BOD.

Blank value solution Blank value solutions are used to determine the blank value. Blank value solutions are obtained when samples of the dilution water are mixed with nitrification inhibitors and subjected to the same treatment as the sample dilutions. The blank value is determined from the measurement of the oxygen content of the blank value solutions before and after the incubation period.

BODn Abbreviation for the biochemical oxygen demand of a water sample after an incubation period of n days.

Calibration Comparing the value from a measuring system (e. g. the displayed value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).

Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on the geometry.

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Conductivity Short form of the expression, specific electrical conductivity. It is a measured value of the ability of a substance to conduct an electric current. In water analysis, the electrical conductivity is a dimension for the ionized substances in a solution.

Conductometry Name of the conductivity measuring technique.

Diaphragm The junction is a porous body in the housing wall of reference electrodes or electrolyte bridges. It forms the electrical contact between two solutions and makes electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.

Dilution water Designation for the water which is used to dilute a water sample that is to be analyzed.

The dilution water is a water saturated with air of the purity degree 3 (acc. to EN ISO 3696) that has been mixed with electrolyte solutions.

If the dilution water was mixed with bacteria (innoculation water), the mixture is referred to as innoculated dilution water.

Details on the production of dilution water are laid down in EN 1899-1.

Electrode zero point The zero point of a pH electrode is the pH value at which the electromotive force of the pH electrode at a specified temperature is zero. Normally, this is at 25 °C.

Electromotive force of anelectrode

The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the galvanic voltages of the electrode. Its dependency on the pH results in the electrode function which is characterized by the parameters, slope and zero point.

End measurement Measurement of the oxygen content of sample dilution and dilution water after expiry of the incubation period.

Firmware Software installed on an instrument (here: measuring module) that is fixed and cannot be changed.

Incubation period Storage period (usually 5 or 7 days) of sample dilutions and dilution water at a specified temperature (20 °C) in the dark.

ISA English abbreviation for a sample conditioning solution, which is used to adjust the ionic strength of a sample.

Ionic Strength Adjustment

Measured parameter The measured parameter is the physical dimension determined by measuring, e. g. pH, conductivity or D. O. concentration.

Measured value The measured value is the special value of a measured parameter to be determined. It is given as a combination of the numerical value and unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).

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Measuring system The measuring system comprises all the devices used for measuring, e. g. measuring instrument and probe. In addition, there is the cable and possibly an amplifier, terminal strip and armature.

Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g solvent.

MultiCal® WTW name stating that a measuring instrument provides several calibration procedures.

Offset potential The measurable potential of a symmetrical electrode, the membrane of which is immersed in a solution with the pH of the nominal electrode zero point. The asymmetry is part of the offset potential.

ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in water if these substances become effective on an electrode surface (e. g. a gold or platinum surface).

OxiCal® WTW name for a procedure to calibrate D. O. measuring systems in water vapor saturated air.

Oxygen partial pressure Pressure caused by the oxygen in a gas mixture or liquid.

Oxygen saturation Short name for the relative D. O. saturation. Note: The D. O. saturation value of air-saturated water and the D. O. saturation value of oxygen-saturated water are different.

pH value The pH is a measure of the acidic or basic effect of an aqueous solution. It corresponds to the negative decadic logarithm of the molal hydrogen ions activity divided by the unit of the molality. The practical pH value is the value of a pH measurement.

Potentiometry Name of a measuring technique. The signal (depending on the measured parameter) of the electrode is the electrical potential. The electrical current remains constant.

Reference temperature Fixed temperature value to compare temperature-dependent measured values. For conductivity measurements, the measured value is converted to a conductivity value at a reference temperature of 20 °C or 25 °C.

Reset Restoring the original condition of all settings of a measuring system.

Resistance Short name for the specific electrolytic resistance. It corresponds to the reciprocal value of the electrical conductivity.

Resolution Smallest difference between two measured values that can be displayed by a measuring instrument.

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Salinity The absolute salinity SA of seawater corresponds to the relationship of the mass of dissolved salts to the mass of the solution (in g/Kg). In practice, this dimension cannot be measured directly. Therefore, the practical salinity is used for oceanographic monitoring. It is determined by measuring the electrical conductivity.

Salt content General designation for the quantity of salt dissolved in water.

Sample dilution Designation for the water sample diluted with dilution water.

Slope The slope of a linear calibration function.

Slope (relative) Designation used by WTW in the D. O. measuring technique. It expresses the relationship of the slope value to the value of a theoretical reference probe of the same type of construction.

Standard solution The standard solution is a solution where the measured value is known by definition. It is used to calibrate a measuring system.

Start measurement Measurement of the oxygen content of sample dilution and dilution water at the beginning of the incubation period.

TDS Total dissolved solids

Temperature coefficient Value of the slope of a linear temperature function.

Temperature compensation Name of a function that considers the temperature influence on the measurement and converts it accordingly. Depending on the measured parameter to be determined, the temperature compensation functions in different ways. For conductimetric measurements, the measured value is converted to a defined reference temperature. For potentiometric measurements, the slope value is adjusted to the temperature of the test sample but the measured value is not converted.

Temperature function Name of a mathematical function expressing the temperature behavior of a test sample, a probe or part of a probe.

Test sample Designation of the sample ready to be measured. Normally, a test sample is made by processing the original sample. The test sample and original sample are identical if the test sample was not processed.

TISAB English abbreviation for a sample conditioning solution, which is used to adjust the ionic strength and pH value of a sample.

Total Ionic Strength Adjustment Buffer

Total dissolved solids (TDS) Mass that remains of the substances dissolved in an aqueous solution after a specified filtering and drying procedure, as long as these substances are not volatile under the conditions of this procedure.

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16.3 Index

AAir pressure display . . . . . . . . . . . . . . 120Application notes (TC) . . . . . . . . . . . . 154Asymmetry . . . . . . . . . . . . . . . . . . . . . 71Authorized use . . . . . . . . . . . . . . . . . . 16AutoCal . . . . . . . . . . . . . . . . . . . . 71, 77AutoRead

Drift criteria . . . . . . . . . . . . . . . . . 131ISE measurement . . . . . . . . . . . . . 103Oxygen measurement . . . . . . . . . . 130pH measurement . . . . . . . . . . . . . . 84

AutoStore . . . . . . . . . . . . . . . . . . . . 169

BBarcode reader . . . . . . . . . . . . . . . . . . 42

Setting for BOD measurements . . . . 133Basic principles of operation . . . . . . . . . 31Battery compartment . . . . . . . . . . . . . 201Baud rate . . . . . . . . . . . . . . . . . . . . . 195BOD . . . . . . . . . . . . . . . . . . . . . . . . 132BOD routines . . . . . . . . . . . . . . . . . . 148Buffer solutions . . . . . . . . . . . . . . . . . . 73

CCalibrating

D. O. measurements . . . . . . . . . . . 123pH measurements . . . . . . . . . . . . . 71

Calibrationfor ISE measurements . . . . . . . . . . . 94

Calibration procedures pH . . . . . . . . . . . 71Calibration record . . . . . .71, 94, 123, 181Changing the language . . . . . . . . . . . . 50Changing the roll of paper . . . . . . . . . . 202Cleaning . . . . . . . . . . . . . . . . . . . . . 203ConCal . . . . . . . . . . . . . . . . . . . . . . . 71ConCal single-point calibration . . . . . . . . 81ConCal two-point calibration . . . . . . . . . 81Conductivity calibration evaluation . . . . 157Connect plug-in power supply . . . . . . . . 23Connect the probe . . . . . . . . . . . . . . . . 21Connect the terminal . . . . . . . . . . . . . . 22

DD. O. concentration . . . . . . . . . . . . . . 129D. O. partial pressure . . . . . . . . . . . . . 129

D. O. saturation . . . . . . . . . . . . . . . . .129Data format . . . . . . . . . . . . . . . .196, 197Data output . . . . . . . . . . . . . . . . . . . .183Data storage . . . . . . . . . . . . . . . . . . .167Date and time . . . . . . . . . . . . . . . . . . .49Default settings . . . . . . . . . . 70, 122, 155Deleting measured values . . . . . . . . . .176Determining/setting up the cell constant .156Digital recorder . . . . . . . . . . . . . . . . . .186Display . . . . . . . . . . . . . . . . . . . . . . . .11Display contrast . . . . . . . . . . . . . . . . . .51Display illumination . . . . . . . . . . . . . . . .52Displaying measurement series/

values numerically . . . . . . . . . . . . .174Displaying series of data graphically . . . .172Displaying stored measured values . . . .172Disposal . . . . . . . . . . . . . . . . . . . . . .203Drift control . . . . . . . . . . . . . . . . .84, 130Drift control (ISE measurement) . . . . . . .103

EElectrode evaluation . . . . . . . . . . . . . . .95Error messages . . . . . 207, 209, 211, 213External keyboard . . . . . . . . . . . . . . . . .41External printer/PC . . . . . . . . . . . 194, 199External recorder . . . . . . . . . . . . . . . .199

GGraphical display . . . . . . . . . . . . . . . .185

IIBM PC keyboard . . . . . . . . . . . . . . . . .41Integrated printer . . . . . . . . . . . . . . . .189ISECal . . . . . . . . . . . . . . . . . . . . . . . .94

KKey functions . . . . . . . . . . . . . . . . . . . .38Keys . . . . . . . . . . . . . . . . . . . . . . .10, 12Keys on the measuring module . . . . . . . .40Keys on the terminal . . . . . . . . . . . . . . .39

LLists . . . . . . . . . . . . . . . . . . . . . . . . .229

237

Index inoLab 740

MMaintenance . . . . . . . . . . . . . . . . . . 201Measured parameter

Conductivity . . . . . . . . . . . . . . . . 151Dissolved oxygen . . . . . . . . . . . . . 119

Measured value resolutionpH display . . . . . . . . . . . . . . . . 69, 90Voltage display . . . . . . . . . . . . 68, 89

MeasuringBOD end measurement . . . . . . . . . 140BOD start measurement . . . . . . . . 134Concentration . . . . . . . . . . . . . . . 102Conductivity . . . . . . . . . . . . . . . . 163D. O. content . . . . . . . . . . . . . . . . 128ORP voltage . . . . . . . . . . . . . . . . . 85pH value . . . . . . . . . . . . . . . . . . . . 83

Measuring location . . . . . . . . . .21, 22, 25Measuring range

Cond . . . . . . . . . . . . . . . . . . 88, 151Measuring ranges . . . . . . . . . . . . . . . 224Measuring the temperature . . . . . . . . . . 55Memory for measured values . . . . . . . 167Menu . . . . . . . . . . . . . . . . . . . . . . . . 42

NNumerical display . . . . . . . . . . . . . . . 184

OOperating safety . . . . . . . . . . . . . . . . . 16ORP . . . . . . . . . . . . . . . . . . . . . . . . . 85ORP electrode . . . . . . . . . . . . . . . . . . 85Output of measured values . . . . . . . . . . 46

PPC . . . . . . . . . . . . . . . . . . . . . . . . . 194pH calibration evaluation . . . . . . . . . . . . 72pH system messages . . . . . . . . . . . . . 207pH value . . . . . . . . . . . . . . . . . . . . . . 83pH/Ion concentration . . . . . . . . . . . . . . 87pH/ion concentration . . . . . . . . . . . . . . 67Print interval . . . . . . . . . . . . . . . . . . . 198Printing . . . . . . . . . . . . . . . . . . . . . . 190

Calibration record . . . . . . . . . . . 71, 94calibration record . . . . . . . . . . . . . 123

Printing quality . . . . . . . . . . . . . . . . . 193Probe evaluation . . . . . . . . . . . . . . . . 124

238

Rrecorder . . . . . . . . . . . . . . . . . . . . . .199Replacing the batteries . . . . . . . . . . . .201Reproducibility . . . . . . . . . . . 84, 131, 164Reset

Cond . . . . . . . . . . . . . . . . . . . . . .155Oxi . . . . . . . . . . . . . . . . . . . . . . .122pH/ISE . . . . . . . . . . . . . . . . . . . 70, 89

SSafety . . . . . . . . . . . . . . . . . . . . . . . . .15Safety precautions . . . . . . . . . . . . . . . .15Salinity correction . . . . . . . . . . . . . . . .120Saving

Series of measurements . . . . . . . . .169Scope of delivery . . . . . . . . . . . . . . . . .19Setting the date . . . . . . . . . . . . . . . . . .21Settings

Conductivity . . . . . . . . . . . . . . . . .151D. O. measurements . . . . . . . . . . .119pH/ISE measurements . . . . . . . . 67, 87

Single-point calibration (pH) . . . . . . . . . .71Slope . . . . . . . . . . . . . . . . . . . . . 71, 123Sockets on the terminal . . . . . . . . . . . . .13Software . . . . . . . . . . . . . . . . . . . . . . .14Storage of calibration records . . . . . . . .181Storing

individual measured values . . . . . . .168System configuration

erasing . . . . . . . . . . . . . . . . . . . .180recall . . . . . . . . . . . . . . . . . . . . . .179saving . . . . . . . . . . . . . . . . . . . . .178

System messages . . . . . . . . . . . . . . .205Conductivity . . . . . . . . . . . . . . . . .213ISE . . . . . . . . . . . . . . . . . . . . . . .209Oxygen . . . . . . . . . . . . . . . . . . . .211pH . . . . . . . . . . . . . . . . . . . . . . .207Printer . . . . . . . . . . . . . . . . . . . . .206Terminal . . . . . . . . . . . . . . . . . . .205

TTechnical Data

Dissolved oxygen . . . . . . . . . . . . .224ISE . . . . . . . . . . . . . . . . . . . . . . .223

Technical data . . . . . . . . . . . . . . . . . .215Conductivity . . . . . . . . . . . . . . . . .226Measuring module . . . . . . . . . . . . .220

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inoLab 740 Index

Terminal . . . . . . . . . . . . . . . . . . . 217Temperature compensation . . . . . . . . . 154Temperature probe . . . . . . . .83, 102, 128Temperature unit . . . . . . . . . . . . . . . . . 54Terminal messages . . . . . . . . . . . . . . 205Three-point calibration

ConCal (ISE measurement) . . . . . . . 98Troubleshooting . . . . . . . . . . . . . . . . 205Two-point calibration

AutoCal TEC . . . . . . . . . . . . . . . . . 77ConCal (ISE measurement) . . . . . . . 97

Two-point calibration (pH) . . . . . . . . . . . 71

WWhat to do if... . . . . . . . . . . . . . . . . . 205

ZZoom function . . . . . . . . . . . . . . 173, 187

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Index inoLab 740

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Wissenschaftlich-Technische Werkstätten GmbH

Dr.-Karl-Slevogt-Straße 1D-82362 Weilheim

Germany

Tel: +49 (0) 881 183-0+49 (0) 881 183-100

Fax: +49 (0) 881 183-420E-Mail: [email protected]: http://www.WTW.com

Documents

InoLab 740 Manual (pH Meter Manual)