pH Meters - Wenk LabTec - Laboratory equipment, · PDF file · 2009-03-24Sample Preparation Laboratory & Field ... - for pH measurement - for maintenance and cleaning ... Handheld

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pHpHpHpH MeterspH Meters

Handheld pH meters

Portable pH meters

Laboratory pH meters

Electrodes

Accessories

The pH is a measure of the acidity or alkalinity of a sample. A pH of 7 means thatthe sample is neutral and reacts neither like an acid nor like a base. Fresh tap water,for example, is approximately neutral. Samples with a pH of less then 7 are acidic,e.g. lemonade, lemon juice or hydrochloric acid. In practice pH values down tobelow -1 are known. An alkaline sample has a pH of more than 7, e.g. stale tapwater, water containing detergents or soda lye. The pH scale reaches values ofmore than 15.

orange juice sea water

Cola ammonia

0.4% HCI milk 0.4% NaOH

-1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

acidic neutral basic/alkaline

The more the pH differs from 7, the more aggressive the sample. For each pH unitthe acidic or basic effects increase by a factor of 10.

pH can be measured by electrochemical pH measuring systems, indicator strips,indicators or colorimeters. Of these only electrochemical measurements provideaccurate results.

Measurements are made with an electrode.

The electrode is an electrochemical sensor which consists of a measuring electrodeand a reference electrode. The voltage at a membrane alters according to the pHof the sample solution. The electrodes normally used today are constructed so thatthe voltage at the membrane is 0 mV when the pH is 7. The more the pH differsfrom 7, the larger the voltage signal produced. The pH meter uses this signal tocalculate the pH.

pH

Further information on this subject canbe requested from WTW:

pH handbookApplication reportsOffprints

Literature

Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0)881-183-0 · Fax: +49 (0)881-62539

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pH Meters

Model from page

Handheld pH meters Quality in a set of three 28- Simple to operate model- Time-proven model with memory function- All-rounder with interface

Portable pH meters Classic 32Robust, impact-resistant, waterproof, transportable, pH depth measurements down to 100 m

Laboratory inoLab® top quality in 3 stages 34pH meters - simple and reliable

- compact and communicative- flexible and powerful

Electrodes favorably priced, universal, reliable 38

pH meter accessories 42 Calibration and maintenance supplies 42

- for pH measurement- for maintenance and cleaning

Temperature sensors 44 Recommended accessories 45

- stands and electrode holders- stirrers- measuring and storage vessels

For documentation Software, printer and accessories 180

ORP measurements 46

Other instruments with built-in pH measurement from page

Ion meters 48

Multi-parameter instruments 96

pH meters for every application

Handheld pH meters

Portable pH meters

Laboratory pH meters


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pHpHpH


pH MetersHandheld pH MeterspH 315i, pH 330i and pH 340i

NEW

Handy

Waterproof

Low-power systemallows continuousoperation for up to 3000 h

Easy to use

GLP-conform

Complete in SET

Features

General Information

about handheld pH meters can be found on pages 14 - 17.

Pocket-sized precision

WTW handheld pH meters are dustproof and waterproof, theycan also be submersed. The large and clear multifunctionaldisplay allows the values to be read off safely and comfortably.The silicone keypad with tactile response ensures simple operation. Automatic switch-off combined with an energy-saving system permits continuous operation for up to 3000 h.

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pH 315i

Handheld pH Meters


YearWarranty

IP 66IP 67 3

pH 315i, pH 330i, pH 340ihandy · waterproof · GLP-conform

WTW handheld pH meters are available in three versions:

pH 315i:

Very robust and waterproof battery-operatedpH/mV meter. Measuring errors are avoided bythe silicone keypad with only 5 keys and a sim-plified calibration method with automatic bufferrecognition and display for standard buffers.AutoRead also ensures stable and reproducibleresults.

pH 330i:

Very robust and waterproof battery-operatedpH/mV meter with built-in datalogger, real-time clock, GLP-supporting functions, displayfor calibration switchable between pH and mV.MultiCal® automatic calibration with bufferrecognition, automatic temperature compen-sation.

pH 340i:

Very robust and waterproof pH/mV meter forbattery or mains supply operation with built-indatalogger, real-time clock, GLP-supportingfunctions, display for calibration switchablebetween pH and mV. MultiCal® automaticcalibration with buffer recognition, automatictemperature compensation and additionalRS 232 analog and digital output.

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Model pH 315i pH 330i pH 340iMeasuring range/ pH -2.00 … +16.00 pH pH -2.000 ... +19.999 pH resolution -2.00 … +19.99 pH

mV -1999 … +1999 mV mV -999.9 ... +999.9 mV -1999 … +1999 mV

Temp. -5.0 … +105.0 °C Temp. -5.0 ... +105.0 °C

Accuracy pH ±0.01 pH pH ±0.005 pH pH ±0.003 pH (± 1 digit) at +15 … +35 °C at +15 … +35 °C

mV ±0.3 mV at +15 °C … +35 °C mV ±0.3 mV at +15 °C … +35 °C mV ±0.2 mVTemp. ±0.1 K Temp. ±0.1 K Temp. ±0.1 K

Temperature Automatic for pH electrodes with Automatic for pH electrodes with built-in temperature sensor, compensation built-in temperature sensor, TFK 325 / Pt 1000

TFK 325 / Pt 1000 manual by entering sample temperature

Display LCD display 60 x 45 mm visible area, simultaneous display of measurement, temperature, special characters

Sensor evaluation Depends on calibration results, shown on display

Calibration alarm – 1 ... 999 days, adjustable

AutoRead For reproducibility better For reproducibility better than 0.02 pHthan 0.05 pH

Calibration Simplified 1, 2 or 3-point MultiCal® automatic calibration: calibration with automatic buffer AutoCal automatic 2 or 3-point calibration with DIN buffers recognition AutoCal-TEC automatic 2 or 3-point calibration with AutoCal automatic 3-point calibration WTW technical buffers

with DIN buffers ConCal® conventional 1-point calibration with any buffers

Calibration – GLP-conform calibration protocol; protocol last protocol stored in memory

Data storage – 500 data sets (measurement, temperature, date/time, identity no.); time-controlled storage at intervals 5 s ... 60 min, non-volatile data storage (even when changing batteries)

Data output Via display Via display Via display or interface, time-controlled at intervals 5 s ... 60 min

Interface – – Self-configuring as analog output according to electrode potential, i.e. 50 - 60 mV/pH unit, or RS 232 bi-directional interface

Operating period 3000 hours with normal 4 x 1.5 V batteries (AA) 3000 hours continuous operation with AutoSwitchOff after 1 h (except logger operation) with batteries, optional mains power

supply, no rechargeable batteries

Protection type IP 66 and IP 67 to IEC 529

Dimensions 172 x 80 x 37 mm (H x B x D)

Weight Approx. 300 g

Certified to CE, TÜV/GS, UL and/or cETLus, CUL

Warranty 3 years

Technical Data

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Handheld pH Meters


Handheld pH Meters SETs Order No.

pH 315i Handheld pH meter, with electrode, professional case and accessories 2A10-101



pH 340i Handheld pH meter with mains power supply, with electrode, professional case and accessories 2A30-111

SenTix® electrodes – please select oneSenTix® 21 pH combination electrode, gel electrolyteSenTix® 21 pH combination electrode, gel electrolyte and temperature sensor TFK 325/HCSenTix® 41 pH combination electrode with built-in temperature sensor, gel electrolyteDrinking water kit SenTix® 81 pH combination electrode with built-in temperature sensor

and measuring vessel for drinking water

SET ordering example pH 315i + SenTix® 41 electrode 2A10-101

Note: other electrodes in SET or instrument versions for 120 VAC/60 Hz are available on request.

Ordering Information SETs

1

1 1

T2

2

Handheld pH Meters Order No.

pH 315i Robust and waterproof handheld pH meter, for battery operation 2A10-100

pH 330i Robust and waterproof handheld pH meter with datalogger, for battery operation 2A20-100

pH 340i Robust and waterproof handheld pH meter with datalogger and serial interface, 2A30-100for battery operation

pH 340i Robust and waterproof handheld pH meter with datalogger and serial interface, 2A30-110for battery or mains operation

Ordering Information Handheld pH Meters

Please refer to page 38 for electrodes and page 42 for further accessories.

SET Equipment

Each handheld pH meter is available in a complete application-oriented set

Basic equipment:

• Professional case with built-in measuring set-up and separate compartment for electrode and accessories

• Instrument including batteries • Electrode as chosen • STH 320 stand • WTW technical buffers pH 4.01 - 7.00• KCl solution (3 mol/l)• Beaker• Plug-in power supply (only pH 340i)• Operating instructions

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pHpHpH


pH MetersPortable pH MetersProfiLine pH 197 and ProfiLine pH 197-S

ProfiLine pH 197:

Indestructible pH/mV meter. With rechar-geable battery and mains operation, mea-surement storage, GLP-supporting func-tions, MultiCal®‚ automatic calibration,automatic temperature compensation...Also suitable for pH depth measure-ments down to 100 m with TA 197pH depth armature.

ProfiLine pH 197-S:

As ProfiLine pH 197 but with additionalanalog recorder outputs correspondingto display for pH/mV and temperaturevalues.

Robust

Shockproof

Waterproof

Portable

Reliable

Standard pH measure-ment and pH measure-ment at depths downto 100 m

Features

pH depth armature TA 197 pH with built-in temperature sensor, up to 100 mcable with waterproof plug (IP 67), steel armoring (material no. 1.4571) withscrew-off protective hood, pressure-resistant to max. 10 bar, fits into 2” boreholes,without combination electrode (see page 33).

YearWarranty

IP 66IP 67 3

WTW portable pH meters

The WTW pH meters of the ProfiLine pH 197 series are both hose-proof (IP 66)and submersible (IP 67. They convince because of their high degree off operatorcomfort and safe operator guidance via the large multifunctional display. They areequipped with a carrying/support handle and carrying strap as standard.

The portable pH meters are available in 2 versions:

Accessories for pH measurement at depths down to 100 m

General Information

about portable pH meters can be found on pages 18 – 19.

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Portable pH Meters


Model ProfiLine pH 197 ProfiLine pH 197-SMeasuring range/ pH -2.00 ... +16.00 pHresolution mV -1250 ... +1250 mV

Temperature -5.0 ... +99.9 °C

Accuracy pH ±0.01 pH(± 1 digit) mV ±2 mV

Temperature ±0.1 K

Temperature Automatic for pH electrodes with built-in temperature sensor TFK 325 / Pt 1000compensation manual by entering sample temperature

Display LCD display 60 x 35 mm visible area, simultaneous display of measurement, temperature, special characters

AutoRead For reproducibility better than 0.02 pH

Calibration MultiCal® automatic calibrationAutoCal automatic 2-point calibration with DIN buffersAutoCal-TEC automatic 2-point calibration with WTW technical buffersConCal® conventional 1 or 2-point calibration with any buffers

Data storage Ring memory for 50 pairs of measurements with data protection

Data output Via display or interface

Interface Unidirectional RS 232 interface Unidirectional RS 232 interface2 analog recorder outputs for measurement and temperature output corresponding to display

Operating time Continuous operation from mains supply; 1500 hours with rechargeable batteries with AutoSwitchOff after 1 h

Protection type IP 66 and IP 67 to IEC 529

Dimensions 230 x 185 x 90 mm (B x D x H)

Weight Approx. 1.5 kg

Certified to CE, TÜV/GS, UL, CUL

Warranty 3 years

Technical Data

Portable pH meters Order No.

ProfiLine pH 197 Robust, waterproof, submersible pH/mV meter 100 350

ProfiLine pH 197-S As ProfiLine pH 197, but additionally with 2 analog recorder outputs 100 315

Note: 120 VAC / 60 Hz versions on request

Standard pH combination electrodeSenTix® 41 pH combination electrode with built-in temperature sensor and 103 635

waterproof plug, immersion depth 120 mm

For other electrodes and buffer solutions see Accessories

Depth armatures for pH measurements with ProfiLine pH 197 and ProfiLine pH 197-SpH depth armatures with built-in temperature sensors, cable (length optional) with waterproof plug (IP 67) 1.4571 steel armoring and screw-off protective hood, pressure-resistant to max. 10 bar, fits into 2” boreholes, without combination electrode

Cable length Order No. Cable length Order No.

TA 197 pH-4 4 m 108 260 TA 197 pH-25 25 m 108 265

TA 197 pH-6 6 m 108 261 TA 197 pH-40 40 m 108 266

TA 197 pH-10 10 m 108 262 TA 197 pH-60 60 m 108 267

TA 197 pH-15 15 m 108 263 TA 197 pH-100 100 m 108 268

TA 197 pH-20 20 m 108 264

Combination electrodes suitable for depth armature TA 197 pHSensoLyt® SEA pH combination electrode for heavily polluted waters 109 115

SensoLyt® GDA pH combination electrode for surface waters and slightly polluted waters 109 116

SensoLyt® PtA ORP combination electrode 109 125

Ordering Information


Thinkinnovative

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Seeinnovative

Feed and on/off keyskeys for control-ling the built-inprinter


pH MetersLaboratory pH MetersinoLab® pH Level 1

inoLab® pH Level 2

inoLab® pH Level 3

Performance-orientedinstrument range

Simplified operator convenience

Mains-independent

Suitable as bench andwall-mounted models

Country-specificunits

ISO-conform documentation

Application-oriented displays

Features

inoLab® pH Level 1: simple and reliable

Routine laboratory pH/mV meter withlarge multifunctional display for pH andtemperature, automatic temperaturecompensation, MultiCal® calibrationsystem; for battery or mains operation.

inoLab® pH Level 2: compact and communicative

Precision pH/mV meter with largemultifunctional display for pH andtemperature, automatic temperaturecompensation, MultiCal® calibrationsystem, built-in measurement storagewith GLP-conform documentation anddigital interface. Option: with built-inprinter (paper width 112 mm) andthermal paper accepted for use inofficial documents.

YearWarrantyIP 43 3

inoLab® Level 2

inoLab® Level 1

MultiCal®

automatic calibration

AutoReadautomatic driftcontrol for stableand reproduciblemeasurements

General Information

about laboratory pH meters can be found on pages 20 - 25.

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Touchinnovative

Laboratory pH Meters


inoLab® pH Level 3 with Terminal Level 3:flexible and powerful

High-performance pH/mV/ion meter with graphics display and digital recorderfunction for pH, temperature and ion-selective measurement, automatic temperaturecompensation, high resolution (0.001 pH), MultiCal® calibration system, built-inmeasurement storage with GLP-conform documentation and digital interface. PCkeyboard interface for connecting an external keyboard or a barcode reader. Includessoftware for direct control by PC. Option: with built-in printer (paper width 112 mm)and thermal paper accepted for use in official documents.

YearWarrantyIP 43 3

Features

5-point calibration by linear regression

Freely selectable buffer sets

Graphic evaluation possible

Built-in digital plotter

Connection for bar-codereader or PC keyboard

Selectable instrument language

Extended GLP functions

Free-of-charge downloadsfor inoLab® pilot or terminal

inoLab® Level 3

menu-guided graphics display

Terminal Level3

AutoReadautomatic drift control forstable and reproduciblemeasurements

RUN/ENTERtriggers the measuringprocess

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pHpHpHpHpHpH


Model pH Level 1 pH Level 2 pH Level 3Range/ pH -2.000 ... +19.999 pHResolution -2.00 ... +19.99 pH

mV -999.9 ... +999.9 mV-1999 ... +1999 mV

Temp. -5.0 ... +105.0 °C

Accuracy pH ±0.005 pH from -2 ...105 °C ±0.005 pH from -2 ...105 °C ±0.003 pH from -2 ...105 °C(±1 digit) ±0.01 pH ±0.01 pH ±0.01 pH

mV ±0.3 mV ±0.3 mV ±0.2 mV ±1 mV ±1 mV

Temp. ±0.1 K ±0.1 K ±0.1 K

Temperature 0... +99 °C automatically with TFK 150, TFK 325 or Pt-1000, orcompensation pH -20... +130 °C if sample temperature entered manually

AutoRead For reproducibility better than 0.02 pH

Real-time clock – yes

Calibration MultiCal® automatic calibration MultiCal® automatic calibrationAutoCal: automatic 2-/3-point calibration with DIN buffers AutoCal: automatic 2-/3-/5-point

calibration with DIN buffersAutoCal-TEC: automatic 2-/3-point calibration AutoCal-TEC: automatic with WTW technical buffers 2-3-point calibration with WTW

technical buffersConCal®: conventional 1-/2-point calibration with any buffers ConCal®: conventional 1-/2-point

calibration with any buffersISECal: 2 and 3 point calibration with standard solutions

Calibration – GLP-conform protocol of calibration; protocol last calibration stored in memory

Calibration timer – adjustable, 1... 999 days

Sensor evaluation Depends on the calibration results, shown in display

Limit values – manual limit input with acoustic alarm

Data memory – 200 records (measurement, temperature) 2000 records (measurement, temperature)

Data output Display only Display or interface Display, interface or PC

Analog interface – Corresponds to electrode potential, Analog output corresponding to display in i.e. 50... 62 mV/pH unit combination with terminal Level 3

Digital interface – Bidirectional RS 232 Bidirectional RS 232

Operating period/ 3000 h with commercially available 4 x 1.5 V batteries With terminal: universal plug-in power Energy supply or mains power supply supply 230 VAC or 120 VAC

Without terminal: via PC keyboard interface

Protection type IEC 529 / IP 43 without built-in printer

Dimensions 230 x 210 x 70 mm (B x D x H) 250 x 300 x 70 mm (B x D x H)

Weight 1.3 kg 1.6 kg

Certified to CE, TÜV/GS, UL, CUL

Warranty 3 years on the instrument

Technical Data

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1

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4

H

3

Laboratory pH Meters


inoLab® laboratory pH meters Order No.

inoLab® pH Level 1 Simple and reliable pH meter for routine work 1A10-110

inoLab® pH Level 2 Compact precision pH meter with serial interface 1A20-110

inoLab® pH Level 2 Compact precision pH meter, additionally equipped with built- in 1A21-110printer for GLP-conform documentation

inoLab® pH Level 3 Flexible and powerful – the intelligent pH measuring place consisting 1A30-110of multifunction box and universal terminal, with PC software/connection cable

inoLab® pH Level 3 The intelligent pH measuring place, additionally equipped with built-in printer 1A31-110

inoLab® pH Level 3 The integrated pH measuring place, with PC software/connection cable, without printer/terminal 1A32-100

Ordering Information for inoLab® pH meters

inoLab® pH SETs Order No.

inoLab® pH Level 1 Including electrode, passive multifunction box and accessories 1A10-111

inoLab® pH Level 2 Including electrode, passive multifunction box and accessories 1A20-111

inoLab® pH Level 2 Including built-in printer, electrode, passive multifunction box and accessories 1A21-111

inoLab® pH Level 3 Including terminal, electrode and accessories 1A30-111

inoLab® pH Level 3 With built-in printer, including terminal, electrode and accessories 1A31-111

inoLab® pH Level 3 Without printer/terminal, with PC software/connection cable, electrode and accessories 1A32-101

SenTix® electrodes – please select oneSenTix® 21 pH combination electrode, gel electrolyteSenTix® 41 pH combination electrode with built-in temperature sensor, gel electrolyteSenTix® 61 pH combination electrode, liquid electrolyteSenTix® 81 pH combination electrode with built-in temperature sensor, liquid electrolyteSenTix® HW Precision electrode with ground diaphragm

SET ordering example inoLab® pH Level 1 + SenTix® 61 electrodes 1A10-111

Note: other electrodes in SET, instrument versions for 120 VAC/60 Hz or BNC versions are available on request

Ordering Information for inoLab® pH meters SETs – “ready to go”

1

2

3

4

H

3


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pHpHpHpHpHpH


SenTix®SenTix® electrodesSenTix® – the new electrode system from WTW offers more comfort, qualityand precision

The low-impedance membrane glass ensures that stable measurements arerapidly achieved even at low sample temperatures

The reference electrolyte with its low silver ion content together with thetemperature-insensitive platinum diaphragm prevent interference byprecipitated silver.

SenTix® electrodes are robust and shockproof. A special membrane glass andthe plastic shaft ensure mechanical stability.

SenTix® with liquid electrolyte – the optimized outflow speed rinses the platinumdiaphragm free and prevents contamination by precipitates or dirt even duringchanges in temperature; with new membrane glass for even quicker response.

SenTix® H and HW ground diaphragm electrodes allow the electrolyte outflowspeed at the diaphragm to be altered.

The clever sliding closure prevents the electrolyte from escaping during storage. Waterproof DIN or BNC plugs, either plug head system or with fixed cables,

can be selected.

The clever idea forfilling SenTix®

electrodesAnyone who has to frequently work with pHelectrodes knows about the awkwardproperties of KCl solution:• it climbs up beaker walls,• it penetrates even the finest pores and cracks

and • it crystallizes out leaving an unpleasant-

looking residue.

Topping up the electrolyte solutionof combination electrodes andreference electrodes seldom happens without some dropsescaping and forming harmlessbut nasty-looking crystalline stains

in a very short time.This is why this

should always becarried out on aworking surface.This can evenhappen with the

new range ofSenTix® electrodes,

but far less oftenwhen it is carried out

correctly. But how?

Take the enclosed plastic dropping bottle and:• remove the red cap• cut off tip – if still sealed – as

near the end as possible so thatthe tip can be inserted in therefilling hole of the SenTix®

electrode to seal it off• in order to prevent overpressure

in the electrode squeeze thedropping bottle gently and theninsert the tip into the refillinghole so that the dropped bottleis seated firmly in the refillinghole.

• by releasing and squeezing thebottle several times in succession(pumping) the topping-upprocess can be carried outperfectly without any mess

pH electrodes with gel electrolytefor routine measurements on-site orin the laboratory: SenTix® 20, SenTix® 21, SenTix® 21-3,SenTix® 22, SenTix® 41, SenTix® 41-3,SenTix® 42

Precision pH electrode SenTix® H and SenTix® HW

Penetration pH electrode SenTix® Sp

Surface pH electrode SenTix® Sur

pH micro electrode SenTix® Mic

High-quality pH electrodes withliquid electrolyte for demandingwork: SenTix® 60, SenTix® 61, SenTix® 62SenTix® 81, SenTix® 82

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39Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0)881-183-0 · Fax: +49 (0)881-62539

Technical DataSenTix® 20 SenTix® 41 SenTix® 60 SenTix® 81

Order No. 103 630 103 635 103 639 103 642Measuring range pH 0 ...14 pH 0 ...14 pH 0 ...14 pH 0 ...14 pHOperating range °C 0 … 80 °C 0 … 80 °C 0 ...100 °C 0 ...100 °CReference electrolyt gel gel KCl 3 mol/l, Ag+-free KCl 3 mol/l, Ag+-freeInternal buffer pH = 7.0 ±0.25 pH = 7.0 ±0.25 pH = 7.0 ±0.25 pH = 7.0 ±0.25Membrane shape cylindrical cylindrical conical conicalMembrane resistance <1 GOhm at 25 °C <1 GOhm at 25 °C <600 MOhm at 25 °C <600 MOhm at 25 °CDiaphragm Fiber Fiber Platinum PlatinumShaft material Noryl Noryl Glass GlassShaft length 120 mm ±1 120 mm ±1 120 mm ±1 120 mm ±1Shaft diameter 12 mm ±0.5 12 mm ±0.3 12 mm ±0.5 12 mm ±0.5Connection Plug head Fixed cable Plug head Fixed cableElectrode cable AS/DIN, AS/DIN-3, Length 1 m AS/DIN, AS/DIN-3, Length 1 m

or AS/BNC or AS/BNCElectrode plug DIN plug or BNC, DIN plug and DIN plug or BNC, DIN plug and

as selected banana plug as selected banana plugTemperature sensor – built-in NTC (30 KΩ) – built-in NTC (30 KΩ)

SenTix® 21 SenTix® 61Order No. 103 631 103 640

as SenTix® 20, as SenTix® 60,but with: but with:

Connection Fixed cable Fixed cableElectrode cable Length 1 m Length 1 mElectrode plug DIN plug DIN plug

SenTix® 21-3 SenTix® 41-3Order No. 103 632 103 636

as SenTix® 20, as SenTix® 41, but with: but with:

Connection Fixed cable Fixed cableElectrode cable Length 3 m Length 3 mElectrode plug DIN plug DIN plug

banana plug

SenTix® 22 SenTix® 42 SenTix® 62 SenTix® 82Order No. 103 633 103 637 103 641 103 643

as SenTix® 20, as SenTix® 41, as SenTix® 60, as SenTix® 81, but with: but with: but with: but with:

Connection Fixed cable Fixed cable Fixed cable Fixed cableElectrode cable Length 1 m Length 1 m Length 1 m Length 1 mElectrode plug BNC plug BNC plug BNC plug BNC plug

SenTix® H SenTix® HW SenTix® SP SenTix® Sur SenTix® MicOrder No. 103 644 103 650 103 645 103 646 103 647Measuring range pH 0 ...14 pH 0 ...13 pH 0 ...13 pH 0 ...13 pH 0 ...14 pHOperating range °C 0 ... 80 °C 0 ... 60 °C 0 ... 80 °C 0 ...50 °C 0 ... 100 °CReference electrolyt KCl 3 mol/l, Ag+-free KCl 3 mol/l, Ag+-free Referid® Referid® KCl 3 mol/l, Ag+-freeInternal buffer pH = 7.0 ±0.25 pH = 7.0 ±0.25 pH = 7.0 ±0.25 pH = 7.0 ±0.25 pH = 7.0 ±0.25Membrane shape Cylindrical Cylindrical Spear Flat CylindricalMembrane resistance <2 GOhm at 25 °C <800 MOhm at 25 °C <400 MOhm at 25 °C <1 GOhm at 25 °C <700 MOhm at 25 °CDiaphragm Cylinder Cylinder Hole Split ring CeramicShaft material Glass Glass Glass Glass GlassShaft length 170 mm ±1 170 mm ±1 65/25 mm ±2 120 mm ±2 40/80 mm ±2Shaft diameter 12 mm ±0.5 12 mm ±0.3 15/5 mm ±0.5 12 mm ±0.5 12/5 mm ±0.5Connection Plug head Plug head Plug head Plug head Plug headElectrode cable AS/DIN, AS/DIN-3, AS/DIN, AS/DIN-3, AS/DIN, AS/DIN-3, AS/DIN, AS/DIN-3, AS/DIN, AS/DIN-3,

or AS/BNC or AS/BNC or AS/BNC or AS/BNC or AS/BNCElectrode plug DIN plug or BNC, DIN plug or BNC, DIN plug or BNC, DIN plug or BNC, DIN plug or BNC,

as selected as selected as selected as selected as selectedTemperature sensor – – – – –

Electrodes for pH Meters

Technical Data

40

pHpHpH


Basic pH electrodes with gel electrolyte Order No.

SenTix® 20 pH combination electrode, gel electrolyte, plug head 103 630

SenTix® 21 pH combination electrode, gel electrolyte, with waterproof DIN plug, 1 m cable 103 631

SenTix® 21-3 pH combination electrode, gel electrolyte, with waterproof DIN plug, 3 m cable 103 632

SenTix® 22 pH combination electrode, gel electrolyte, with BNC plug, 1 m cable 103 633

SenTix® 41 pH combination electrode with built-in temperature sensor, gel electrolyte, 103 635with waterproof DIN plug, 1 m cable

SenTix® 41-3 pH combination electrode with built-in temperature sensor, gel electrolyte, 103 636with waterproof DIN plug, 3 m cable

SenTix® 42 pH combination electrode with built-in temperature sensor, gel electrolyte, 103 637with BNC plug, 1 m cable

Standard pH electrodesSenTix® 60 pH combination electrode, liquid electrolyte, immersion depth 120 mm, with plug head 103 639

SenTix® 61 pH combination electrode, liquid electrolyte, immersion depth 120 mm, with 103 640waterproof DIN plug, 1 m cable

SenTix® 62 pH combination electrode, liquid electrolyte, immersion depth 120 mm, with 103 641BNC plug, 1 m cable

SenTix® 81 pH combination electrode with built-in temperature sensor, liquid electrolyte, 103 642immersion depth 120 mm, with waterproof DIN plug, 1 m cable

SenTix® 82 pH combination electrode with built-in temperature sensor, liquid electrolyte, 103 643immersion depth 120 mm, with BNC plug, 1 m cable

Precision pH electrodesSenTix® H Precision pH combination electrode with ground diaphragm for high alkali ranges, 103 644

use in low ionic media, immersion depth 165 mm, with plug head

SenTix® HW Precision pH combination electrode with ground diaphragm for low-ionic media, 103 650immersion depth 165 mm, with plug head (available from 1.10.1999)

pH electrodes for special applicationsSenTix® Sp Spear-type pH combination electrode for penetration measurements in meat, fruit and cheese, 103 645

with plug head

SenTix® Sur Surface pH combination electrode for measurements on smooth surfaces, 103 646e.g. paper, film material, etc., with plug head

SenTix® Mic Micro pH combination electrode for measurements of small volumes and in small vessels, 103 647shaft diameter 5 mm, with plug head

Reference electrodeR 502 Reference electrode with electrolyte bridge and fixed cable 106 975

R 503/D Reference electrode with electrolyte bridge and fixed cable, banana plug 4 mm dia. 106 571

R 503/P As R503/D, but with US plug 2 mm dia. 106 570

Double platinum electrodeLTI/NS Double platinum electrode (unplatinized) with NS 14.5 and 1 m connection cable 502 000

(for pH meters with dead-stop connection)

Connection cables for plug-head pH electrodesAS/DIN Connection cable with DIN plug, 1 m cable 108 110

AS/DIN-3 Connection cable with DIN plug, 3 m cable 108 112

AS/BNC Connection cable with BNC plug, 1 m cable 108 114

Ordering Information for electrodes

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Electrodes for pH Meters


ApplicationsSenTix® SenTix® SenTix® SenTix® SenTix® SenTix® SenTix® SenTix® SenTix® SenTix®

20, 41, 41-3, 60, 61, 81, 82 H HW Sp Sur Mic ORP*21-..., 22 42 62

Acids

Ammonia

Aquarium water

Beer

Beverages

Bleach solution

Boiler feedwater

Bread

Cheese

Coffee extract

Condensate

Cosmetics

Demineralized water

Developer

Dispersion colors

Distilled water

Drinking water

Electroplating baths

Electroplating wastewater

Extracts

Fat

Fixing baths

Fruit juice

Fruit

Groundwater

Household cleansers

Juice

Leather

Lemonade

Lyes

Margarine

Meat

Milk

Mineral water

Non-aqueous liquids

Oil/water emulsions

Paint, water-soluble

Paper extract

Paper

Protein-containing liquids

Rainwater

Saliva

Salt solutions

Sausage

Seawater

Shampoo

Skin

Soil extract

Solids (penetration)

Solids (surface)

Sulfide-containing liquids

Surface water

Suspensions

Swimming pool water

Tapwater

Tris buffer solutions

Vegetable juice

Vegetables

Wastewater

Wine

Yogurt

recommended by WTW suitable for this application * for ORP Measurements see page 47

42

pHpHpH

In practice working reference buffer solutions are used; theseare obtained by comparing them with primary or secondarymaterials. Normal WTW pH buffers meet these requirements.The uncertainty factor of pH of the particular buffer solution isdocumented by a certificate(see page 184, Services).

TEP 10 Trace: only suitable for3xxi series handheld meters


pH MeterspH Meter AccessoriesWith the right accessories to perfect results

Assemble your own individual accessories.

You will find suitable accessories here for all

applications from simple pH measurements

right up to special applications.

Page Calibration and maintenance supplies 42

for pH measurements

Temperature sensors 44

Recommended accessories 45- stands and electrode holders- stirrers- measuring and storage vessels

Accessories for ORP measurements 47

The traceable technical buffer 10 forthe new 3xxi series of handheld pHmeters with a pH uncertainty ±0.03

for pH measurement

Standard buffer solutions and technicalbuffer solutions traceable back toNIST/PTB

The new buffer bottles from WTW

• easy to dispense

• easy to use

• reliable calibration

Calibration and maintenance supplies

NEW

Software and printers

Information is given onpages 180 - 183.

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43Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0)881-183-0 · Fax: +49 (0)881-62539

pH Meter Accessories

Technical buffer solutions (1 liter) Order No.

TEP 4 1 x 1 l bottle: pH 4.01* 108 700

TEP 7 1 x 1 l bottle: pH 7.0* 108 702

TEP 10** 1 x 1 l bottle: pH 10.0 (note: not suitable for 3xxi series handheld meters) 108 704

TEP 10 Trace 1 x 1 l bottle: pH 10.01 (note: only suitable for 3xxi series handheld meters)* 108 703

Calibration and maintenance set with technical buffer solutionsSORT/TEP Set of technical buffer solutions (1 x TEP 4, 1 x TEP 7, 1 x TEP 10**) 108 980

plus 1 bottle pepsin cleaning solution (250 ml)plus 1 bottle KCl solution 3 mol/l (250 ml)

Calibration and maintenance set with technical buffer solutions for gel electrolytesSORT/TEP/G Set of technical buffer solutions (1 x TEP 4, 1 x TEP 7, 1 x TEP 10**) 108 822

plus 2 x 250 ml bottles KCl solution 3 mol/l

Technical buffer solutions (250 ml) Order No.

TPL 4 1 x 250 ml bottle: pH 4.01* 108 800

TPL 7 1 x 250 ml bottle: pH 7.0* 108 802

TPL 10** 1 x 250 ml bottle: pH 10.0 (note: not suitable for 3xxi series handheld meters) 108 804

TPL 10 Trace 1 x 250 ml bottle: pH 10.01 (note: only suitable for 3xxi series handheld meters)* 108 805

Calibration and maintenance set with technical buffer solutionsSORT/TPL Set of standard buffer solutions (1 x TPL 4, 1 x TPL 7, 1 x TPL 10**) 108 820


Calibration and maintenance set with technical buffer solutions for gel electrolytesSORT/TPL/G Set of standard buffer solutions (1 x TPL 4, 1 x TPL 7, 1 x TPL 10**) 108 823


Technical buffer solutions (50 ml) Order No.

STP 4 1 x 50 ml bottle: pH 4.01* 108 706

STP 7 1 x 50 ml bottle: pH 7.0* 108 708

STP 10** 1 x 50 ml bottle: pH 10.0 (note: not suitable for 3xxi series handheld meters) 108 710

Calibration and maintenance set with technical buffer solutions for gel electrolytesSORT/STP/G Set of technical buffer solutions (1 x STP 4, 1 x STP 7, 1 x STP 10**) 109 721


* traceable back to NIST/PTB **note: not suitable for 3xxi series handheld meters

Ordering Information for buffer solutions

Standard buffer solutions (250 ml), reference material (DIN) Order No.

PL 4 1 x 250 ml bottle: pH 4.006/4.01* 109 110

PL 7 1 x 250 ml bottle: pH 6.865/6.87* 109 120

PL 9 1 x 250 ml bottle: pH 9.180/9.18* 109 130

Calibration and maintenance set with standard buffer solutionsSORT/K Set of standard buffer solutions (1 x PL 4, 1 x PL 7, 1 x PL 9) 109 415


* traceable to NIST/PTB

Ordering Information for buffer solutions

44

pHpHpH


Technical buffer solutions for special applications Order No.

TEP 2 1 x 1 l bottle: pH 2.00 108 698

Standard buffer solutions for special applications Order No.

PL 2 1 x 250 ml bottle: pH 1.679/1.68 109 000

PL 12 1 x 250 ml bottle: pH 12.454/12.45 109 400

NBS K/5 Large set of standard buffer solutions 109 410(1 x PL 2, 1 x PL 4, 1 x PL 7, 1 x PL 9, 1 x PL 12)

Maintenance and cleaning solutions Order No.

KCl-AgCl-250 1 x 250 ml bottle KCl solution 3 mol/l saturated with AgCl 109 702

KCl-250 1 x 250 ml bottle KCl solution 3 mol/l 109 705

PEP/pH 3 x 250 ml bottles pepsin cleaning solution 109 648only for electrodes with liquid electrolytes

Ordering Information for special applications


Temperature sensors

The electrode potential depends not only on the pH but also on the temperatureof the sample. All WTW pH meters therefore have a temperature compensationfunction and automatically correct the influence of the temperature on the slopeof the pH electrode with the help of a connected temperature sensor.

Temperature sensors

Temperature sensors Order No.

TFK 325 Sensor for temperature measurement and automatic temperature compensation 102 280for aqueous solutions, with waterproof plug

TFK 325/HC As TFK 325, but with additional built-in holding clip 109 818

TFK 325/HC-3 As TFK 325, but additionally with built-in holding clip, cable length 3 m 109 823

TFK 150 Sensor for temperature measurement and automatic temperature compensation 102 274for aggressive media

TFK 150-1,5 As TFK 150, but additionally with 1.5 m cable and waterproof plug 102 270

TFK 150/E Spear-type temperature sensor for temperature measurement and automatic temperature 102 269compensation with 1 m cable and waterproof plug


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pH Meter Accessories


Stand and electrode holder Order No.

STH 650 Benchtop stand with flexible electrode holder for pH electrodes, ion-selective 109 809electrodes, reference electrodes, temperature sensors, oxygen sensors and TetraCon® 325 conductivity cells

HC 325 Holding clip for SenTix® pH combination electrode and temperature sensor TFK 325 109 821

Stirrers Order No.

MR 3000 Magnetic stirrer with mains cable 102 250

pH-Mix 540 Immersion stirrer for attaching to stand STH 650, 102 246for use with pH 540 GLP and MultiLab® 540

Measuring and storage vessels Order No.

MG/pH Measuring vessel for determining the pH of drinking water, 108 062suitable for pH combination electrodes SenTix® 81. Also suitable for use as storage vessel for gel electrodes

D 530 Flow-thru vessel made of transparent PVC, suitable for all pH combination electrodes 108 060with a shaft diameter of 12 mm and temperature sensor TFK 150 or TFK 530

Recommended accessories

Recommended accessories

Protective armoring

for safe on-site use

1 SM 325 Shock-absorbing, rubber protective armoring with folding support and electrodecable clamping device

2 TG/pH Sleeve set, suitable for SM 325 protective armoring, consisting of electrode sleeve,holding device and additional carrying strap for field use. Can also be used forstoring the electrode

3 FM 325/pH Field armoring, specially designed for rough use on-site and in industry, extremelyrobust and shock-resistant thanks to protective armoring with integrated electrodesleeve, carrying handle and additional carrying strap with holding device,electrode cable clamping device and folding support for laboratory measurements

Ordering InformationOrder No.

SM 325 Shock-absorbing, rubber protective armoring 902 818

TG/pH Sleeve set, suitable for protective armoring SM 325 902 830

FM 325/pH Field armoring, specially for rough conditions 902 832

Stand STH 650

Benchtop stand with flexible electrode holder, suitable for pH combination electrodes and temperature sensors, also for attaching to instrument

Magnetic stirrer MR 3000

Uniform sample stirring with the magnetic stirrer produces a constant diffusion potential at the reference electrode diaphragm and a more rapid sample exchange at the electrode membrane.

Documents

pH Meters - Wenk LabTec - Laboratory equipment, · PDF file · 2009-03-24Sample Preparation Laboratory & Field ... - for pH measurement - for maintenance and cleaning ... Handheld