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VPFlowMate User Manual UK / Europe Office Tel: +44 (0)845 9000 601 Fax: +44 (0)845 9000 602 [email protected] www.omniinstruments.co.uk Australia / Asia Pacific Office Tel +61 (0)282 442 363 Fax +61 (0)294 751 278 [email protected] www.omniinstruments.com.au USA / Canada Office Tel +1-866-849-3441 Fax +1-866-628-8055 [email protected] www.omniinstruments.net

Flowmeter Manual

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UK / Europe Office Tel: +44 (0)845 9000 601 Fax: +44 (0)845 9000 602 [email protected] www.omniinstruments.co.uk

Australia / Asia Pacific Office Tel +61 (0)282 442 363 Fax +61 (0)294 751 278 [email protected] www.omniinstruments.com.au

USA / Canada Office Tel +1-866-849-3441 Fax +1-866-628-8055 [email protected] www.omniinstruments.net

VPFlowMate User Manual

Contents1 Getting Started 1.1 Principle of operation . . . . . . . . . . . . . . . . . . . . . . 2 Mechanical Installation 2.1 Introduction . . . . . . . . . . . . . . . . . 2.2 Applications . . . . . . . . . . . . . . . . . 2.3 Installation guidelines . . . . . . . . . . . . 2.4 Leak testing . . . . . . . . . . . . . . . . . 2.5 Installation of In-line type ow meters . . . . 2.5.1 In-line ow conditioner . . . . . . . . 2.5.2 Quick couplings . . . . . . . . . . . 2.5.3 Compression ttings . . . . . . . . . 2.5.4 Flanges . . . . . . . . . . . . . . . . 2.6 Installing the VPP insertion probe . . . . . . 2.6.1 Selecting the installation point . . . 2.6.2 Piping guidelines . . . . . . . . . . . 2.6.3 Other sensors and transducers . . . . 2.6.4 Determination of the insertion depth 2.6.5 Prepare the installation . . . . . . . 2.6.6 Sensor xation . . . . . . . . . . . . 2.6.7 Sensor alignment . . . . . . . . . . . 2.6.8 Insertion depth . . . . . . . . . . . . 2.6.9 Software conguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 5 5 6 6 6 6 6 7 7 7 8 9 9 9 11 11 11 11 11 11 13 13 14 14 16 16 16

3 Electrical installation 3.1 Electrical connection guidelines- UL 508 Listing for USA & Canada 3.2 Electrical connection guidelines: general remarks . . . . . . . . 3.3 IO description . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Connecting the VPFlowMate to your PC . . . . . . . . . . . . 3.4.1 Connecting the power supply . . . . . . . . . . . . . . 3.4.2 Connecting the RS232 . . . . . . . . . . . . . . . . . .

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iv

CONTENTS

4 Measurement & Data readout 4.1 Power and Warm up time . . . . . . . . . . . . . 4.2 Zero check . . . . . . . . . . . . . . . . . . . . . 4.3 Reading the ow value (analog and digital signals) 4.4 Reading the ow value (display) . . . . . . . . . . 4.5 Time constants . . . . . . . . . . . . . . . . . . .

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17 17 17 17 17 18 19 19 19 21 21 21 21 21 23 25

5 Software 5.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . 5.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Maintenance 6.1 General maintenance . . . . . . 6.2 Cleaning the VPFlowMate . . . 6.3 Calibration . . . . . . . . . . . 6.4 Symptoms & causes & solutions A Nomenclature B Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WarningsIn this manual, we have used the following signs:

Do not continue without reading and understanding of this message. Not following the instructions may lead to damage of equipment, personal injury of death.

Important warning message.

Application hint.

v

vi

CONTENTS

GENERAL WARNINGS BY OPERATING THE VPFLOWMATE YOU CONFIRM THAT YOU HAVE READ AND FULLY UNDERSTOOD THIS USER MANUAL AND YOU HAVE AGREED WITH OUR WARRANTY STATEMENT. FOLLOW ALL SAFETY PRECAUTIONS AND WARNINGS! NOT FOLLOWING THE GUIDELINES COULD RESULT IN PERSONAL INJURY, DEATH AND / OR DAMAGE TO THE EQUIPMENT AND ITS SURROUNDINGS. NEVER USE THE VPFLOWMATE OUTSIDE THE SPECIFICATIONS AS IT MIGHT DAMAGE THE INSTRUMENT OR GIVE MISREADINGS. ALWAYS REFER TO THE SPECIFICATIONS OF YOUR FLOWMETER BEFORE USE! TOLERANCES: UNLESS SPECIFIED OTHERWISE, ALL INDICATED DIMENSIONS ARE NOMINAL. VPINSTRUMENTS TAKES NO LIABILITY FOR ANY DAMAGES OR MALFUNCTIONING OF THE FLOWMETER CAUSED BY MISUSE. IN ANY CASE, WARRANTY IS LIMITED TO REPAIR OR REPLACEMENT OF THE DEFECTIVE PRODUCT. THE VPFLOWMATE IS NOT APPROVED FOR ANY FISCAL METERING APPLICATION. CONSULT YOUR NATIONAL OFFICE FOR APPLICABLE LAWS AND DIRECTIVES. THE INFORMATION IN THIS MANUAL HAS BEEN REVIEWED AND IS BELIEVED TO BE CORRECT. NO RESPONSIBILITY IS ASSUMED FOR ANY INACCURACIES. THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY AND SUBJECT TO CHANGE WITHOUT NOTICE

viii

CONTENTS

CE Declaration

DECLARATION OF CONFORMITY Product type Brand name(s) Model numbers Manufacturer : : : : Thermal mass flow meter VPInstruments, VPFlowMate VPF-R..-M..-D..-S...-E.. VPP-R..-M..-D..-S...-E.. Van Putten Instruments B.V. Buitenwatersloot 335 2614 GS Delft The Netherlands 2001 November 21, 2001

Year of first making Date of issue

: :

The complete product family has been tested and found to be compliant with the requirements of the following European directives: EN 61326-1 EN 50082-1 Van Putten Instruments BV Pascal F.A.M. van Putten Director No signature has been printed for security reasons; contact us if a hardcopy is required

UL/ C-UL Listing markThe VPFlowMate is UL/cUL Listed in accordance with UL 508 (Industrial Control Equipment) and CAN/CSA 14-95 (Industrial Control Equipment), UL File E231429. Details can be found on the UL website www.ul.com

Please refer to chapter 3, section 3.2 for UL compliant use of the product.

1

Chapter 1

Getting StartedThank you for choosing the VPFlowMate digital mass ow meter. The VPFlowMate and the VPFlowMate insertion probe are easy to use mass ow meters for Compressed Air. Check the packaging box for any inconsistencies. Should there be any shipping damage, notify the local carrier. At the same time a report should be submitted to Van Putten Instruments BV, PO BOX 151, 2600 AD DELFT, The Netherlands.

1.1

Principle of operation

The VPFlowMate uses the Thermal Mass Flow principle. The sensor is made of silicon, just like a computer chip. Flow induces a temperature gradient in the silicon sensor. This gradient can be measured with on-chip sensing elements. A heating element keeps the sensor at a constant temperature. Our silicon ow sensors have the following unique features: High dynamic range; High sensitivity and resolution; High reproducibility and stability over time.

3

Chapter 2

Mechanical Installation

WARNING VPInstruments TAKES NO LIABILITY FOR ANY DAMAGES OR MALFUNCTIONING OF THE FLOWMETER CAUSED BY POLLUTION, DIRT, DUST, WATER, OIL OR ANY OTHER CONTAMINATION OF THE MEDIUM IN WHICH YOU ARE USING THE FLOWMETER. DIRT, RUST PARTICLES, SAND, OIL DROPLETS OR DUST MIGHT DAMAGE THE SENSOR, SO MAKE SURE THAT ALL PIPING AND THE AIR IS CLEAN!

2.1

Introduction

The VPFlowMate is designed in such a way that it should be very easy for you to install. However, it is important to read all installation instructions, especially when the product is new to you. The VPFlowMate intended for use with clean air in light industrial environments (non hazardous). Experience with process control equipment, sensors and other transducers is required.

5

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CHAPTER 2. MECHANICAL INSTALLATION

2.2

ApplicationsWARNING

These devices are only for use with air, nitrogen and other non hazardous fluids or non combustible gases. The maximum working pressure is 16 bar g.

Main applications of the VPFlowMate are: Compressed air ow measurement, air ow monitoring, metering, energy monitoring, testing of pneumatic systems. Take a look at our Website www.vpinstruments.com for application examples.

2.3

Installation guidelines

Refer to the installation drawing or technical drawing for up- and downstream length guidelines. Refer to the user manual and instructions of the Swagelok process connectors for instructions. Check the PIPING TABLE before installation of the owmeter! Make sure that no Teon tape is trapped within the tubing!

2.4

Leak testing

Perform a leak test at all times! Leakage can lead to dangerous situations or bad measurements. Check the system on leaks using leak testing liquid or leak testing equipment.

2.5

Installation of In-line type ow meters

Depending on the in-line model you have, the VPFlowMate requires at least 20D straight piping at the inlet and 5D at the outlet. 2.5.1 In-line ow conditioner

Your VPFlowMate can be equipped with built-in ow conditioners. These conditioners will reduce the required upstream and downstream length.

2.5. INSTALLATION OF IN-LINE TYPE FLOW METERS

7

2.5.2

Quick couplings

Your VPFlowMate can be equipped with quick couplings for compressed air applications. Follow the instructions of the quick coupling manufacturer. 2.5.3 Compression ttings

Follow the instructions of the tting manufacturer. 2.5.4 Flanges

Flanges may be screwed into the threaded openings of the in-line VPFlowMate. Use Teon tape or use O-ring sealed anges. NEVER use liquid sealant, because they might permanently damage the screw thread!!!!

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CHAPTER 2. MECHANICAL INSTALLATION

2.6

Installing the VPP insertion probe

The VPFlowMate insertion mass ow meter is designed to operate under a wide variety of conditions. To ensure its longevity of operation, precautions should be taken before and during its installation.

WARNING INSERTION SENSORS CAN BECOME DANGEROUS PROJECTILES! THE IMPROPER USE OF INSERTION PROBES UNDER HIGH PRESSURES (ANYTHING ABOVE AMBIENT PRESSURE) IS VERY DANGEROUS. USE A SAFETY CHAIN UNDER OPERATING CONDITIONS. PLEASE KEEP CLEAR OF THE METER WHEN THE LINE IS BEING PRESSURIZED. THIS IS A GOOD SAFETY PROCEDURE FOR THE INSTALLATION OF ANY EQUIPMENT IN A PRESSURIZED LINE. DO NOT LOOSEN THE NUT UNLESS THE LINE IS DEPRESSURIZED OR A HOT-TAP MECHANISM HAS BEEN INSTALLED PROPERLY ON THE METER SHAFT. USE HOT TAPPING EQUIPMENT WHICH IS RATED FOR THE OPERATING PRESSURE OF YOUR COMPRESSED AIR LINE. REFER TO THE MANUAL OF THE HOT TAPPING EQUIPMENT BEFORE USE. REFER TO YOUR PLANT SAFETY MANUAL FOR ADDITIONAL SAFETY MEASURES.

Installation is a four step process. This four step approach can be regarded as a checklist for mobile measurements and air audits. 1. Select the proper installation site; follow all piping guidelines; 2. Prepare the installation (mount an insertion point for the Swagelock coupling, prepare electrical connections and power supply); 3. Insert and x VPFlowMate;

2.6. INSTALLING THE VPP INSERTION PROBE

9

4. Congure the VPFlowMate (this step may be done before step 2 if the installation site is completely known). 2.6.1 Selecting the installation point

A) The VPFlowMate insertion ow meter requires minimum upstream and downstream piping. Refer to the piping table for details! B) Choose a site with minimal mechanical vibrations. C) Avoid areas of high humidity or corrosive atmosphere where possible. D) When installing the meter choose a site which is accessible, and allows ease of wiring and maintenance. 2.6.2 Piping guidelines

To ensure the high accuracy of ow measurement specied on the identication sheet, piping and installation instructions must be followed carefully. A) The pipe immediately up and down stream of the ow meter must be of sucient length, straight and free of obstructions. Refer to the former paragraph and to the piping table (gure 2.1); B) Weld beads on the internal wall of the pipe before or after the ow meter should be ground ush with the pipe wall before the meter is installed; C) Proper style and proper size gaskets should always be used when installing the ow meter; D) The meter can be placed horizontally. When placed in a vertical line with low air velocities, thermal convection which is caused by the ow sensor may give wrong readings. Refer also to the ISO 14511:2001 (Measurement of uid ow in closed conduits- Thermal mass ow meters) International standard. 2.6.3 Other sensors and transducers

Any other transducer should be installed 5 times D downstream the VPFlowMate insertion ow meter, because they might cause distortion of the ow prole.

10

CHAPTER 2. MECHANICAL INSTALLATION

Fig. 2.1. In the piping table, you can nd the requirements for the minimum piping length up- and downstream of the ow meter. Note that regulator valves should always be installed downstream the ow sensor!

2.6. INSTALLING THE VPP INSERTION PROBE

11

2.6.4

Determination of the insertion depth

Refer to the technical drawing provided with your VPFlowMate to determine the insertion depth. The bottom of the measurement head should be in the middle of the tube. In de-pressurized lines, the internal diameter depth can be measured using a caliper. A piece of tubing or a pencil can be used to mark the insertion depth on the probe. 2.6.5 Prepare the installation

Make sure the installation point is made according the technical drawings pro3 vided on the VPInstruments Web site! If possible, place a 4 inch ball valve, so that the VPFlowMate insertion probe can be retracted and inserted under pressurized conditions. 2.6.6 Sensor xation

SAFETY FIRST: START WITH MOUNTING THE SAFETY LINE! The VPFlowMate inserts through a 1/2 inch compression tting. Watch out with steel compression ttings as they might damage the sensor tube. If you are planning to use the owmeter at dierent places, use a Teon ferrule instead of the stainless steel ferrule. NEVER over-tight the tting, because it may damage the sensor tube. 2.6.7 Sensor alignment

After installing the meter, check for alignment. The owmeter is shaped in a way that alignment is very easy. Alignment by the eye is sucient. 2.6.8 Insertion depth

Check the insertion depth and make sure the sensor is inserted properly. The bottom of the probe should be aligned with the middle of the tube. NOTE that in small tubes, wrong insertion depth can result in large measurement errors, because of the blockage eect. 2.6.9 Software conguration

The VPSuite software can be used to set the pipe diameter and the output units. Refer to the VPSuite manual.

Chapter 3

Electrical installationThe VPFlowMate complies with the CE requirements as stated in the ce declaration. CE compliance can only be achieved when grounding and shielding directions are followed and proper cables and connector assemblies are used.

3.1

Electrical connection guidelines- UL 508 Listing for USA & Canada

The VPFlowMate is intended to be used with a Class 2 power source or Class 2 transformer in accordance with UL1310 or UL1585. As an alternative a LVLC (Low Voltage Limited Current) power source, with the following properties shall be used: The device shall be used with an suitable isolating source such that the maximum open circuit voltage potential available to the product is not more than 24 Vdc and the current is limited to a value not exceeding 8 amperes measured after 1 minute of operation; A fuse in accordance with the UL248 series and rated max 4A shall be Installed in the 24Vdc power supply to the device in order to limit the available current.

WARNING Wrong connections will damage or DESTROY the instrument. Check ALL wiring diagrams!

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CHAPTER 3. ELECTRICAL INSTALLATION

3.2

Electrical connection guidelines: general remarks

Make sure that the following conditions are met:

USE GALVANIC INSULATED POWER SUPPLIES: Switched mode power supplies might generate a high voltage, high-frequency noise. They also might cause ground loops, which could aect the current loop output of the owmeter.

For portable, non-critical applications, a switched mode 12 V DC, 1A power adapter may be used.Low cost or poor quality switched mode power supplies might aect the accuracy!

PAY EXTRA ATTENTION TOP RS232 PORTS. These are often sources of noise and other pollution, since some PC manufacturers do not take EMC requirements seriously.

ALWAYS GROUND THE INSTRUMENT HOUSING. GROUND the instrument, as switched mode power supplies sometimes inject a high voltage on the metal parts of the owmeter.

BEWARE OF GROUND LOOPS. User either one of the proposed ground points. Using both ground points might cause ground loop eects.

3.3

IO description

The VPowMate features the following IO. Please note that the some outputs are optional; refer to the product type number to determine which IO your VPFlowMate oers.

3.3. IO DESCRIPTION

15

Power supply Serial interface

: :

12 to 24 VDC (24V 10%) Class 2. See also appendix B.1. This is a standard RS232 interface, using three wires. Refer to gure ?? for wiring details This is a passive, optical isolated linear output 4 mA corresponds with zero ow, 20 mA corresponds with the maximum ow. See the owmeter calibration report for the maximum ow value. See also appendix ?? and ??. This is a passive, optical isolated low frequency pulse output. 0 mA = low and 20 mA is high. It can be directly connected to pulse based energy counters with active (12..24 volt powered) inputs which work according to the DIN43864 (S0) standard. Depending on the conguration of the owmeter (see vpfcong software) one pulse is equal to a xed volume, for example 1 normal cubic meter.

4..20 mA output

:

Pulse output

:

Depending on the model, the following electrical outputs are available. Please note that the connections are based upon colors of the individual leads. The numbering of connectors may dier.

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CHAPTER 3. ELECTRICAL INSTALLATION

A separate leaet indicating dierent or special wiring may be issued with the product!

3.4

Connecting the VPFlowMate to your PC

WARNING: Wrong connection of the power supply may destroy the RS232 input of your laptop! Never apply +12..24 Volt to any of the pins of the SUB D connector!

In order to connect your VPFlowMate to a personal computer, you will need the VPK02 interface kit, or you can use the RS232 connection on the VPFlowTerminal. From here, a standard RS232 connection cable is used to make the connection. 3.4.1 Connecting the power supply

Always use a proper power supply. Refer to the specications to make sure your power supply is +12..24 Volt Class 2. Connect the black wire to the 0 Volt side of your DC power supply. Connect the red wire to +12..24 Volt side of your power supply. 3.4.2 Connecting the RS232

In order to connect your VPFlowMate to a personal computer, you will need the VPK02 interface kit, which splits the cable into RS232 and power supply. Alternativelu, you will use the RS232 connection on the VPFlowTerminal. A standard RS232 connection cable is used to make the connection.

Chapter 4

Measurement & Data readout4.1 Power and Warm up time

Before switching on the power check if all connections have been made according to gures in chapter 3. Check gas connections again and make sure there is no leakage. Turn on the power. The instrument will start up and performs a selfcalibration. Then it initializes. After this sequence, the instrument is partially warmed up. Complete warm-up time depends on the temperature of the surroundings and the owmeter temperature. It may take up to one hour for complete warm-up.

4.2

Zero check

The VPFlowMate needs no zeroing as long as you keep the instrument clean.

4.3

Reading the ow value (analog and digital signals)

After warming up the instrument is ready to use. Generally, you can immediately read out the ow value. In some circumstances you might want to wait for a few seconds until the ow is stabilized. For instance, when the gas temperature is changing.

4.4

Reading the ow value (display)

On the built-on display, you can see the ow on the rst row. Total gas consumption is shown on the second row. The small underscore or minus sign on the right indicates whether the ow is in ln/minute or m3n/hour. If an asterisk

17

18

CHAPTER 4. MEASUREMENT & DATA READOUT

(*) is shown instead, the output is in m/sec, and the total count (second row on the display) WILL NOT BE UPDATED. Generally, you can immediately read out the ow value. In some circumstances you might want to wait for a few seconds until the ow is stabilized. For instance, when the gas temperature is changing.

4.5

Time constants

Your VPFlowMate has a time constant, which depends on the ow rate. When going from zero ow to a certain ow value, the sensors response is a few seconds, since it is cooled down by the ow. When you abruptly shut o the ow, it generally takes longer to stabilize, since the sensor has to cool down using thermal conduction to the non-moving air, which is a slower process.

Chapter 5

SoftwareVPSuite is provided with your owmeter. A SEPARATE MANUAL is issued with the software.

5.1

System requirements

System requirements are: PC or Laptop with at least Windows 95; Pentium or faster model; True color VGA screen, at least 1024x768; One free COM port; No PDA, modem, cellular phone software or other serial software active during measurements, as these might interfere with the COM port. Install the software according to the instruction manual which can be found on the CD.

5.2

Purpose

The VPFlowMate software package is designed to ease the installation of insertion probes in dierent tube diameters. It also enables you to change the owmeter conguration. You can change sample frequency, zero cuto value, span and so on. The software also contains a data logger feature, for direct on site measurements with your laptop.

19

Chapter 6

Maintenance6.1 General maintenance

The VPFlowMate is a LOW MAINTENANCE product, as long as it is used in the right way, with clean gases.

6.2

Cleaning the VPFlowMate

In case of extreme pollution you can clean the owmeter by gently purging with nitrogen or clean air.

6.3

Calibration

Calibration is performed at VPInstruments.

6.4

Symptoms & causes & solutions

Use the table below to check on basic failures. Contact us if you have any other problem not stated in this table.

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22

CHAPTER 6. MAINTENANCE

Table 6.1. Possible Solutions to common Basic Failures. Symptom No output signals Possible causes No power supply Bad cable Wrong connections General failure Wrong installation Action Check power Check cable Check wiring diagram Consult factory The ow is too low to be detected or the owmeter is mounted in a wrong way Consult factory Consult factory Check alignment of probe Check up- and downstream lengths Check for obstructions in ow pipe 1. Wipe sensor clean 2. Remove any particles 3. Gently dry with clean compressed air or Nitrogen, or let product dry to Air. Check wiring Connect RX line (white) to ground

Wrong output signal

Out of calibration Extreme pollution Wrong installation

Oset signal at zero ow

Extreme pollution

No display or wrong display Display shows O&@*&-

TX and RX wire swapped RX Line open

Appendix A

NomenclatureTable A.1. Nomenclature; x can be any letter/number VPF I -Rxxx II -Pxxx III -Dx IV -Sxxx V -Exxx VI

Table A.2. Explanation of Nomenclature

I. II. III. IV.

Basic Type Designation Range Probe length: or in-line meter diameter: Display options

V. VI.

Output options Connector options

VPP Insertion probe VPF In-line meter Rxxx Pxxx Mxxx Dx 0= 1= Sxxx Exxx

0..xxx (mn/sec) 0..xxx (Length in mm) 0..x.xx inch diameter tube 0 or 1 without Display with Display 0..xxx (manufacturer identication) 0..xxx (manufacturer identication)

23

Appendix B

Electrical connectionsThis appendix describes the electrical connection schemes for the VPFlowMate.

25

26

APPENDIX B. ELECTRICAL CONNECTIONS

Fig. B.1. Power connection only. For models with built-on display

Fig. B.2. Serial connection via RS232

28

APPENDIX B. ELECTRICAL CONNECTIONS

Fig. B.3. Active current loop readout, where the readout unit also generates the power for the 4..20 mA loop (loop-powered).

Fig. B.4. Current loop readout example using a separate power supply and a passive readout device.

30

APPENDIX B. ELECTRICAL CONNECTIONS

Fig. B.5. Pulse output. The pulse output is a potential free, opto isolated output, and can be used as described in DIN43864.

Fig. B.6. Pulse output, converted to Voltage.

IndexCE-Declaration, viii cleaning, 23 compression ttings, 7 conguration, 11 connection electrical, 13 power supply, 16 RS232, 16 to PC, 16 connections electrical, 27 couplings, 7 current loop readout, 28 Data readout, 19 display, 19 electrical outputs, 15 EMC, 13 Failures, 23 xation sensor, 11 anges, 7 ow conditioner, 6 in-line, 6 gradient, 3 insertion depth, 11 insertion probe, 8 Installation in-line meters, 6 installation electrical, 13 guidelines, 6 insertion depth, 11 mechanical, 5 sensor, 11 sensor xation, 11 IO, 14 leak testing, 6 maintenance, 23 operation principle, 3 outputs electrical, 15 piping guidelines, 9 readout current loop, 28 RS232, 16 sensor, 3 silicon, 3 sensor alignment, 11 silicon sensor, 3 software, 11, 21 installation, 21 system requirements, 21 time constants, 20 UL-listing, ix website, ix VPCong, 21

32

INDEX

33

VPFlowDAQ, 21 VPFlowmate applications, 6 software, 21 VPSuite, 11, 21 warm-up time, 19 warnings, v zero check, 19

UK / Europe Office Tel: +44 (0)845 9000 601 Fax: +44 (0)845 9000 602 [email protected] www.omniinstruments.co.uk

Australia / Asia Pacific Office Tel +61 (0)282 442 363 Fax +61 (0)294 751 278 [email protected] www.omniinstruments.com.au

USA / Canada Office Tel +1-866-849-3441 Fax +1-866-628-8055 [email protected] www.omniinstruments.net