VIASENSOR HS-1000
Contents
1. 11 7 APPENDIX B SAMPLE LOG FILE WITH DIAGNOSTIC INFO 11 8 APPENDIX C SAMPLE DIAGNOSTIC DATA DOWNLOAD 12 9 APPENDIX D SAMPLE SERIAL OUTPUT 13 10 APPENDIX E ERROR CODES 2 0 cccceccescceeceeceeeceeceecceeceeccnsceeceeseneceeceeseneeeeseneeeesees 13 11 APPENDIX SAMPLE MAIN SCREEN DISPLAY PARTIAL PRESSURE 14 Page iii VIASENSOR HS 1000 User Manual 1 Introduction Critical to the proper design and performance characterization of polymer electrolyte membrane fuel cells PEMFCs is the accurate measurement of its operating conditions including temperature pressure and moisture content of the hydrogen and air inlet gases Proper reactant gas humidification ensures good fuel cell membrane hydration which is instrumental in maintaining high ionic conductivity Low ionic conductivity leads to decreased fuel cell performance and potentially physical damage as well LANDTEC VIASENSOR HS 1000 Real Time Humidity Sensor uses patented miniature laser technology to enable real time accurate and reliable measurement of the humidity of the inlet gases in PEMFC testing and operation The VIASENSOR provides researchers and fuel cell developers with a solution for in situ real time humidity measuremen2. tab allows selection of VIASENSOR HS 1000 internal parameters Spectrum Average Moving Average and Analog Output The factory default is Spectrum Average 4 Moving Average 2 these are typically the largest values used per each The minimum value for each is 1 and they must be integers Click Get Current Settings to read the values of all three that are currently set within the VIASENSOR HS 1000 The response time of the VIASENSOR HS 1000 depends on two factors the measurement rate and the gas flow rate The slowest of those rates will determine the response time The measurement rate in seconds is calculated from the spectrum average and moving average values as follows tresp 0 26 53 spectrum averages moving averages The internal volume of the sample chamber is 4 cm The response time due to purging the chamber volume is tresp 4 cm flow rate The time in seconds between each data point is calculated as follows laa 0 26 53 spectrum averages For Spectrum Average of 8 the time between data points is approximately 4 5 seconds for Spectrum Average of 1 the time is 0 79 seconds The trade off is that a smaller Spectrum Average will provide less smoothing and slightly more noise in the signal than a larger Spectrum Average will The Get Current Settings button retrieves and displays the current values of the Spectrum Average and Moving Average parameters The Set buttons are used to save
3. a strip chart The Y Axis pull down menu allows the data to be displayed on the main screen as dew point partial pressure in millibars or partial pressure in kPa Note that this selection does not affect the data that is saved in any log file it only changes the display on the PC Click on the white red X in the upper right corner of this screen to save and close this screen SE Setup max Com Port Graph Options Log Data System info test txt Data saved C HS 1000_Data Save diagnostic info to log file Log Data Switch Start Stop The Log Data tab allows the data to be logged Enter a file name in the text box and include the txt Page 6 VIASENSOR HS 1000 User Manual extension with the file name Click on the Log Data Switch to start or stop logging of the data The saved file is in text format and may be imported readily into any analysis program such as Microsoft Excel Sample data is shown in Appendix A Check the box next to Save diagnostic info to log file to save columns of diagnostic data along with the standard data being saved Sample data with diagnostic info is shown in Appendix B Click on the white red in the upper right corner of this screen to save and close this screen ka Setup Com Port Graph Options Log Data System Info Spectrum Average 3 8 Set Moving Average 4 2 Set Degree C Analog Ouput mB The System Info
4. measured with the sensor The sensor reading is not flow rate dependent The flow can be in either direction At low flow rates less than 0 4 L min there will be some increase in the response time of the sensor because of the time required to move the gas mixture through the sample chamber At high flow rates above 15 L min the pressure drop across the sensor may become significant How do you measure very high flow rate gas streams For very high flow rates it is best to divert only a portion of the gas stream through the sensor Very little pressure drop is required to flow gas through the sensor Therefore a Pitot tube or slight restriction in the main gas flow tube is all that is required Contact your sales representative for advice in specific applications How is data output from the sensor The sensor outputs a line of RS 232 serial tab delimited text after each measurement The measurement interval can be chosen by the customer from 0 79 seconds per point with no averaging to 4 5 seconds per point when averaging 8 scans for each measurement Any software that can read this serial data can interface with the sensor Can I get an analog 4 20mA current loop output from the analyzer An analog output 0 is now available What is the maximum dew point range for the sensor The standard measurement range is dew point between 30 C and 100 C Dew point ranges up to 120 C and beyond are also available Contact your sales rep
5. patented tunable diode laser absorption spectroscopy technology to provide direct real time fast response measurements of the water vapor content in fuel cell gas streams The laser beam tuned to a specific absorption wavelength of water vapor is aimed across the inlet gas stream and the sensor essentially counts the number of water vapor molecules passing the laser The tunable diode laser absorption technology is a proven technique as it has been widely used for over 40 years in many other applications The current approach was originally developed at the NASA Caltech Jet Propulsion Laboratory As the humidified gas passes in front of the laser located in a small heated chamber to prevent condensation some of the laser light is absorbed by the water vapor in the gas stream A detector then measures how much laser light was absorbed by the water vapor which corresponds directly to how many water vapor molecules are in the lasers path For a given temperature the area under the spectral line of H2O provides a direct and quantitative measure of the amount of water vapor in the gas stream This water vapor number density molecules per cm value can be converted to any other desired unit such as dew point absolute humidity and relative humidity with knowledge of pressure and temperature at the measurement point Since the laser wavelength is tuned rapidly and continuously this measurement approach is both simple to implement and robust There i
6. 1 0 DewPoint C is the dew point in C of the gas passing through the sample chamber the VIASENSOR It has been calculated from the Vapor Pressure Vapor Pressure mbar is the vapor pressure partial pressure in millibar of the water vapor in the gas stream passing through the sample chamber in the VIASENSOR Temperature C is the temperature in C of the gas as it passes through the sample chamber in the VIASENSOR ErrorCode is defined in Appendix E A value of 0 is the normal output when there is no error condition Note This data is saved as a text file and is readily imported into most programs that you may use for data analysis such as Microsoft Excel 7 APPENDIX B Sample Log File with Diagnostic Info A sample log file from the VIASENSOR Monitoring Software on the PC DewPoint C Vapor Pressure mbar Temperature C ErrorCode Index Transmission Area HalfWidth L Interp R Interp 66 4 267 7 102 1 0 262 0 911 17 90 61 44 0 48 0 37 66 4 267 7 103 9 0 265 0 912 17 79 61 82 0 01 0 35 66 2 264 9 105 1 0 262 0 913 17 53 60 95 0 21 0 31 66 1 264 0 105 9 0 263 0 912 17 67 61 04 0 02 0 11 66 1 264 1 106 6 0 261 0 913 17 54 61 26 0 37 0 16 65 9 261 9 106 7 0 262 0 914 17 37 61 41 0 45 0 37 65 9 262 2 106 7 0 261 0 913 17 58 61 79 0 45 0 13 The information in the columns Index Transmission Area HalfWidth L Interp and R Interp are characteristics of the laser absorption peak This information
7. 1000 monitoring software double click on the program icon on your computer s desktop The following screen shot is the main screen of the program fed VIASPACE HS 1000 E 18 x File Dew Point Deg C M e 68 0 5 0 16807 9 16826 8 Time seconds Dew Point 69 6 Deg Sensor 2 Ready Status OK Gas Temp 95 2 deg C The horizontal axis is time in seconds and the vertical axis is user selectable for dew point in degrees Celsius partial pressure of water vapor in millibars mB or partial pressure in kilopascals kPa The data progresses across the screen much like a strip chart The latest dew point or partial pressure data point is displayed at the bottom of the screen in blue numerals Page 4 VIASENSOR HS 1000 User Manual Sensor Ready indicator is green when the gas temperature in the VIASENSOR HS 1000 sample chamber is at least 5 C greater than the measured dew point of the gas in the chamber At initial power up of the unit and while it warms up the Sensor light typically is red and states Not Ready This is to reduce the risk of condensation in a cold sample chamber if high humidity is run through prior to sufficient warm up Gas Temp is the measured gas temperature within the heated sample chamber in the VIASENSOR HS 1000 Status will display any system error Typically errors will display during the initial 15 seconds after power up while the internal self te
8. Release Date June 5 2009 Version 1 6 Page ii VIASENSOR HS 1000 User Manual Table of Contents t INTRODUGTIOJB 5 is E E Sees a eaa o ga de secacedu codecs A E 1 2 GENERAL OPERATIONAL 2 2 1 HOW DOES THE VIASENSOR HS 1000 2 2 2 WHAT THE VIASENSOR HS 1000 5 5 2 2 9 STORAGE Ae te los a a She alg ce tae A 2 2 4 SAFETY INFORMA TON ot ee i i 3 2 5 SENSOR HARDWARE SETUP ee a ee a a 3 3 THE VIASENSOR HS 1000 SOFTWARE 4 3 1 SOFTWARE 4 9 27 lt Hie E 4 3 3 SERIAL COMMUNICATIONS 00 0 nne Eee hier pner 8 Qu ANALOG OUT RUT aede ee toe re hese o eter oe eee Dep e ede epe eC tee ands 8 4 FREQUENTLY ASKED QUESTIONS FAQ ceeeeeeeeee er rennen nnn n nnn 8 5 TECHNICAL 10 6 APPENDIX
9. VIASENSOR HS 1000 REAL TIME FUEL CELL HUMIDITY SENSOR 7 UNITEL VIASENSOR HS 1000 i gt VIASENSOR HS 1000 LANDTEC North America Inc 850 S Via Suite 112 Colton 92324 USA www VIASENSOR com Class Laser Product Complies with 21CFR1040 10 Model HS 1000 S N 1112 Manufactured July 2007 DANGER Invisible Laser Radiation When Open AVOID DIRECT EXPOSURE TO BEAM USER MANUAL VIASENSOR HS 1000 User Manual Copyright 2007 by LANDTEC All rights reserved No part of this book may be used or reproduced in any form or by any means or stored in a database or retrieval system without consent of the publisher Making copies of any part of this book for any purpose other than your own personal use is a violation of United States copyright laws LANDTEC and VIASENSOR HS 1000 are registered with the U S Patent and Trademark Office For further information contact LANDTEC North America 850 S Via Lata Suite 112 Colton CA 92324 USA Tel 800 821 0496 or 1 909 783 3636 Web www VIASENSOR com LANDTEC Europe Formerly Geotechnical Instruments Sovereign House Queensway Leamington Spa Warwickshire CV31 3JR England Tel 44 0 1926 338111 Web www geotech co uk LANDTEC South America LANDTEC Produtos e Servicos Ambientais Ltda Rua Pedroso de Carmargo 237 Chacara Santo Antonio SP SP CEP 0417 010 Brazil Phone 55 11 5181 6591 Web www landtecbrazil com br LANDTEC
10. any changes of these values These Page 7 VIASENSOR HS 1000 User Manual parameters are saved in the VIASENSOR HS 1000 unit and do not need to be reset each time the PC software is run Diagnostic Data may be saved Enter a file name in the text box and include the txt extension with the file name Click on the Diag Data button to save Note that it may take up to 10 seconds to download and save this data See Appendix C for a sample file and descriptions The saved file is in text format and may be imported readily into any analysis program such as Microsoft Excel Analog Output switch for a VIASENSOR HS 1000 that is equipped with an Analog Output this switch will toggle between an output of partial pressure of water vapor in millibars or an output of dew point in degrees C 3 3 Serial Communications See Appendix D for communication parameters and sample data 3 4 Analog Output An optional feature that may be included with the VIASENSOR HS 1000 in addition to the serial output is an analog output Two standard banana jacks spaced for a dual connector would be located on the front panel of the Control Box The red jack has the positive leg of the signal The analog signal is floating and should not be tied to ground The analog output signal is 0 to 5VDC It is linear between 0 5 and 4 5VDC 0 5VDC 0 millibars partial pressure of water vapor or 0 C dew point 4 5VDC 1000 millibars partial pressure of water vap
11. fset 0 Moving Average 2 The laser scan is divided among 512 channels Plotting DC1 and DC2 as functions of Idx Index will display the sample spectrum and reference spectrum InT is the negative natural logarithm of the laser transmission at each channel Only Spectrum Average and Moving Average may be user set within the software program running on the PC The balance of these parameters is settable only at the factory or by an authorized service representative This information may assist in troubleshooting the VIASENSOR with LANDTEC technical support personnel Note This data is saved as a text file and is readily imported into most programs that you may use for data analysis such as Microsoft Excel 9 APPENDIX D Sample Serial Output Data Sample serial output data direct from the RS 232 Serial Port on the VIASENSOR Control Box Vapor Chamber Peak Dew Pressure Gas Temp Error Peak Trans Peak Half L R Point millibar C Code Index mission Area Width Interp Interp C 688 24 89 1 0 252 0 721 89 07 86 64 0 03 0 32 89 4 677 25 89 0 0 251 0 721 88 77 86 26 0 26 0 23 89 0 676 76 888 0 252 0 721 88 42 86 03 0 11 0 05 89 0 598 92 88 5 0 251 0 735 74 04 76 64 0 39 0 32 85 8 271 19 88 3 0 252 0 914 10 99 38 76 0 49 0 03 66 7 56 57 88 3 0 252 0 954 4 74 3177 0 10 0 37 35 0 Your communications software should be set for 9600 baud 8 N 1 Note The column headings are added for clarification in this appe
12. may assist in troubleshooting the VIASENSOR with LANDTEC technical support personnel Note This data is saved as a text file and is readily imported into most programs that you may use for data analysis such as Microsoft Excel Page 11 VIASENSOR HS 1000 User Manual 8 APPENDIX C Sample Diagnostic Data download file A sample diagnostic data download file from the VIASENSOR Monitoring Software Hygrometer Diagnostics 080523 Idx ROMO DC1 36821 21014 26803 38407 38437 38476 DC2 32495 17931 29342 38758 38779 38805 T 0 000000 0 000000 0 000000 0 000000 0 000000 0 916244 0 916529 0 916984 0 917507 0 000000 0 000000 0 000000 Computational Statistics dc counts Line center found at Minimum Transmission 0 915 Maximum of In T Sample cell zero level 263 0 089 53 Reference leg zero level 137 Calculated values H20 vapor pressure 260 59 mbar Temperature Temperature 107 4 C 107 4 C EEPROM Settings Phase 315 Midpoint 60 Ramp amplitude 30 Imod Analog Output 0 mb 1 DegC 1 0 Spectrum Average 8 Realb 1500 Xleftvmr 180 Xrightvmr 385 SpanFct x 1000 1000 PA 1 0 000E 00 pri 0 000 pr2 1 000 1 000E 00 0 000E 00 0 000E 00 1 000E 00 0 000E 00 0 000E 00 0 000E 00 Thermistor A 9 4630E 04 Thermistor B 2 6650E 04 Thermistor C 5 0700E 08 Page 12 VIASENSOR HS 1000 User Manual Span x 100 2000 Zero Of
13. ndix and do not appear in the serial output of the VIASENSOR The Error Codes are defined in Appendix E A value of 0 is the normal output when there is no error condition The information in the columns Index Transmission Area HalfWidth L Interp and R Interp are characteristics of the laser absorption peak This information may assist in troubleshooting the VIASENSOR with LANDTEC technical support personnel 10 APPENDIX E Error Codes 00 Status Okay 01 Sample power fail 02 Reference power fail 04 08 Spectrum fail Null fail Page 13 VIASENSOR HS 1000 User Manual These errors may appear on the computer display during the first 15 seconds after the VIASENSOR is powered up Once the VIASENSOR completes its internal self test the errors should clear Should any of these errors appear during normal use of the VIASENSOR power the unit off wait 5 seconds and power the unit back on If this does not clear the error condition please contact the factory or your authorized service representative 11 APPENDIX F Sample Main Screen Display Partial Pressure fea YIASPACE 5 1000 E 8 x File Partial Pressure mBar 47 23 5 Time seconds Partial Pressure 306 1 mBar Sensor Ready Status OK Gas Temp 96 5 deg C Page 14
14. nnect the serial cable to the Control Box and to your computer Note there are no user serviceable parts inside the sensor head Should the VIASENSOR HS 1000 appear to malfunction i e give no measurement readings on the computer contact the factory for a Return Material Authorization number and return the unit to the factory for service Page 3 VIASENSOR HS 1000 User Manual 3 The VIASENSOR HS 1000 Software 3 1 Software Setup To install the VIASENSOR HS 1000 monitoring software onto a computer insert the CDROM in the computers CDROM drive The installation utility should run automatically Follow the prompts until completion 3 2 Software Description The VIASENSOR HS 1000 control box has a serial port for communication with a computer Connect the serial cable between this serial port and a serial port on your computer In case your computer has no available serial port a serial to USB adapter will work Please note that the Com Port that your computer assigns to the USB adapter may change each time you unplug and reconnect the USB adapter to the computer If the VIASENSOR HS 1000 has the optional Analog Output in addition to the serial port then the serial port may not need to be used except for diagnostic functions The monitoring software would only be needed for changing internal parameters for data smoothing and for selection of Analog Output units of dew point or of partial pressure of water vapor To run the VIASENSOR HS
15. or or 100 C dew point 4 6VDC or greater indicates an error condition in the VIASENSOR HS 1000 Note that the output selection of partial pressure or dew point can be made in the System Info tab of the VIASENSOR HS 1000 monitoring software Once it is changed the VIASENSOR HS 1000 will store the selection until the user changes it again 4 Frequently Asked Questions FAQ What is the expected lifetime of the laser diode The laser used in the sensor is a telecommunications type laser diode that has an expected lifetime of greater than 20 years Does the sensor drift over time The sensor is designed to be insensitive to variations in most of its components The laser wavelength is scanned continuously across the water absorption line Drift in the laser detectors or sample chamber are balanced out during each scan In addition since none of the sensitive components are in contact with the gas stream they will not become damaged by contaminants in the gas Therefore the sensor calibration should be stable for at least several years How often does the sensor need to be calibrated Even though the sensor calibration should be stable for several years we recommend for critical applications that the calibration be verified each year What is the accuracy of the sensor The uncertainty of the sensor reading is 2 of the reading 1 mB of partial pressure Page 8 VIASENSOR HS 1000 User Manual What range of gas flow rate can be
16. r the technology can be applied to measure very low levels of moisture Please consult your sales representative with your requirements 5 Technical Specifications Measurement Range 40 mB to 1000 mB water vapor partial pressure 30 C to 100 C dew point Response time As quickly as 0 8 seconds for gas flows greater than 0 4 L min Accuracy 2 of the reading in millibars 1 millibar or 0 5 C dew point Max pressure 30 psig 200 kPa Flow rate range flow rate independent Note response time increases below 0 4 L min o High flow rates above 15 L min may be accommodated using a slipstream bypass flow line Ambient temperature range 10 C to 30 C Max sample cell temperature 105 C Wetted materials Nickel plated aluminum sapphire epoxy AC power 90 to 240 VAC 1 4 A 50 to 60 Hz Dimensions and weight o Sample cell 6 x 6 x 2 15 cm x 15 cm x 5 1 7 Ib 0 8 kg o Electronics 8 75 x10 x3 5 22 2cm x 25 4cm x 8 9cm 3 75 Ib 1 7 kg Cable length 40 1 Analog output 0 5VDC 20 mA maximum Data logging software requirements for computer o Minimum display resolution 1024 x 768 o Serial input or Serial USB adapter Page 10 VIASENSOR HS 1000 User Manual 6 APPENDIX A Sample Log File A sample log file from the VIASENSOR HS 1000 Monitoring Software on the PC DewPoint C Vapor Pressure mbar Temperature C ErrorCode 67 4 279 1 107 9 0 67 2 277 1 107 8 0 66 9 273 4 108 0 0 66 8 272 6 108 2 0 67 5 281 1 105
17. resentative for specific applications Can this sensor be used for applications other than fuel cells Yes almost any application that requires a humidity measurement with dew point in the range of 30 C to 100 C can use this sensor What is the response time of the sensor The response time depends on two factors the measurement rate and the gas flow rate The slowest of those rates will determine the response time The measurement rate is calculated from the spectrum average and moving average values as follows Tresp 0 26 53 spectrum averages moving averages The internal volume of the sample chamber is 4 cm The response time due to purging the chamber volume is T esp 4 flow rate How is operating status indicated with analog output The analog output can be configured to go to full scale or zero in the event of a status not OK condition Or as another option a status relay contact can be provided Can the instrument measure below 30C dew point A special range instrument would have to be configured Please consult your sales rep with a complete set of requirements How is the gas temperature measured An epoxy coated thermistor bead measures the temperature Is there a specific orientation for the sensor No The sensor can be placed in any orientation without affecting the accuracy of the reading Page 9 VIASENSOR HS 1000 User Manual Why is the sample chamber heated The sample chamber must be hot
18. s virtually zero drift over time and no calibration needed The VIASENSOR HS 1000 is an excellent and unmatched long term humidity measurement solution for fuel cell testing 2 2 What the VIASENSOR HS 1000 Measures The VIASENSOR HS 1000 will measure and display humidity as Dew Point in degrees Celsius or as Partial Pressure in millibar for all typical gasses used with PEM fuel cells These include e Hydrogen e Air e Oxygen Nitrogen mixes The range of Dew Point that is measurable is between 30 C and 100 C Pressure range for the VIASENSOR HS 1000 is from zero gauge pressure up to 2 atmospheres of back pressure The sensor reading is not flow rate dependent The flow can be in either direction At low flow rates less than 0 4 L min there will be some increase in the response time of the sensor because of the time required to move the gas mixture through the sample chamber At high flow rates above 15 L min the pressure drop across the sensor may become significant For very high flow rates it is best to divert only a portion of the gas stream through the sensor 2 3 Storage The instrument should be kept in a clean dry and warm environment such as an office Page 2 VIASENSOR HS 1000 User Manual 2 4 Safety Information The VIASENSOR HS 1000 is a class 1 laser product that complies with 21CFR1040 10 It is intended for use a general purpose area It is the responsibility of the operator to determine the protection concep
19. st is under way and then clear Descriptions of the error codes are in Appendix E Several options may be set by going to the pull down menu under File at the top left of the main screen Setup Com Port Graph Options Log Data System Info The Com Port tab allows selection of the com port in use by your computer to communicate with the VIASENSOR HS 1000 The default value is 1 Make your selection and click the Com Port switch to Open If an incorrect com port is selected an error message will appear alerting you to that fact Check which com ports are available on your computer by viewing the Hardware Device Manager under System Properties Click on the white red X in the upper right corner of this screen to save and close this screen Page 5 VIASENSOR HS 1000 User Manual SE Setup Wiles Com Port Graph Options Log Data System Info 230 00 3 100 00 X Points 4 300 seconds Dew Point Dew Point Partial Pressure mBar Partial Pressure kPa The Graph Options tab allows selection of the minimum and maximum values on the Y axis vertical axis of the display X Points selects the scale of the horizontal axis It selects the quantity of data points that will be shown across the full width of the display in seconds Additional data will cause the existing data to scroll to the left off of the screen with the visual effect of
20. t and classification required for particular application or the equipment DANGER Invisible Laser Radiation When Open AVOID DIRECT EXPOSURE TO BEAM LANDTEC North America Inc 850 S Via Lata Suite 112 Colton CA 92324 USA Class Laser Product Complies with 21CFR1040 10 Model HS 1000 S N xxxx Manufactured February 2007 2 5 Sensor Hardware Setup The VIASENSOR HS 1000 Sensor Head has 14 compression fittings on 1 4 tubing at the two gas ports Either port may used for the inlet Typically the humidified gas stream from the user s fuel cell test station connects directly to an inlet of the Sensor Head Subsequently the outlet of the Sensor Head connects to the user s fuel cell stack Note the VIASENSOR HS 1000 has a heated sample chamber within the main sensor box that is heated to 105 C to prevent condensation All lines from the user s humidification source to the fuel cell stack should be heated above the dew point temperature to avoid condensation in the line Connect the Sensor Control Cable supplied with the VIASENSOR HS 1000 to the Control Box port 1 Connect the cable ends labeled 2 3 and 4 to the Sensor Head at the connectors labeled the same NEVER connect or disconnect this cable at either end when power is on Connect the power cord to the Control Box The ON OFF switch is right above the power cord inlet on the Control Box The red LED will light up on the front of the Control Box when power is on Co
21. ter than the dew point of the incoming gas or the moisture will condense into water in the sample chamber An indicator on the software display will show when the chamber is less than five degrees above the dew point temperature In what units does the sensor read The serial output data from the sensor is in partial pressure of water in millibars However the display software will also convert the partial pressure reading into kPa or into dew point in C Is the sensor reading dependent gas pressure No The partial pressure reading for water vapor is not dependent on gas pressure However if the partial pressure of water is higher than the gas pressure then condensation will take place Will the sensor respond to entrained water droplets No the sensor can only measure the absorption of individual water molecules not liquid droplets In what background gases can the sensor measure water vapor The sensor reading will be accurate in backgrounds of mono or di atomic molecules H2 N2 O2 He Ar It will also work in typical products of combustion backgrounds CO CO2 NOx SOx Please consult your sales representative for specific backgrounds What are the advantages of the TDLAS sensor over a chilled mirror e Fast response e No need for regular cleaning or maintenance e sensor problem is detected by the software and indicated in the output Can the sensor measure lower levels of moisture Not at this time Howeve
22. ts The VIASENSOR solves the key challenges of accurately measuring the fuel cell humidity levels in high temperature and high humidity environments Specifically the VIASENSOR solution has the following features Continuous fast response real time operation data taken as quickly as every 0 8 seconds Able to detect transients in humidification Non invasive humidity measurement of the inlet gas stream Designed for high humidity and high temperature environments Does not condense the water vapor no long cycle times between measurements Sensor does not get flooded and have to dry out Low cost of operation Modest package size and weight Output interfaces to any PC Carefully unpack the VIASENSOR HS 1000 inspect and inventory the items included The following items should be contained in your package gt Sensor Head Control Box Sensor Control Cable Power Cord Serial Cable User Manual CD ROM with monitoring software for a PC VVVVV ON Immediately notify shipping company if the VIASENSOR HS 1000 unit or accessories are damaged due to shipping Contact LANDTEC immediately if any items are missing For questions regarding operation and performance please contact LANDTEC at Customer Service Technical Support or Factory 800 821 0496 In the US Service 1 909 783 3636 International Page 1 VIASENSOR HS 1000 User Manual 2 General Operational Features 2 1 How does the VIASENSOR HS 1000 work The VIASENSOR uses
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