DEBIMETRIE MASSIQUE POUR L'AIR ET LE GAZ

FICHES TECHNIQUES

	Mass Flowmeters for Gases
	Mass Flowmeters for Gases
	Mass Flowmeters for Gases - Débitmètres massiques pour gaz Spec Sheet
	Mass Flowmeters for Gases - Mass flödesmätare för gaser
	Mass Flowmeters for Gases - Massen-Durchflussmesser für Gase Spec Sheet
	Mass Flowmeters for Gases - Medidores de Flujo para Gases

INFORMATIONS SUR LE SERVICE

NOTES D'APPLICATION

	Correcting for Humidity Effects on TSI General Purpose Flow Meters
	FLOW-Cerfiticate of Calibration for 4000 and 4100 Series Flowmeters
	Measuring Volumes with Gas Mass Flow Sensors
	Reverse Flow Effects on TSI General Purpose Flowmeters
	Standard Flow Rate vs. Volumetric Flow Rate
	TSI Mass Flowmeters Theory of Operation
	Using HyperTerminal® to communicate with TSI Flowmeters

MANUELS

	Model 4040/4043/4045
	Model 4140/4143
	Model 4199 Battery Pack for Series 4000/4100
	Modell 4140/4143 Betriebs- und Wartungshandbuch
	Serie 4000/4100 RS232 Serielle Schnittstelle RS232 Serial Command Set
	Series 4000/4100 Design Guide
	Series 4000/4100 RS232 Serial Command Set

GUIDES RAPIDES

TSI Flow Operating Hints

LOGICIEL

	Flowmeter Set-up Program (Version 1.2)
	Real-time Demo Program (Version 1/19/00)
	Source Code for Real-time Demo Program (Version 8/29/00)

FOIRE AUX QUESTIONS

1. Are the flowmeters bi-directional?
   The flowmeters cannot detect the direction of the flow only the magnitude of the flow. Also the meters are calibrated in the direction indicated by the arrow on the bottom of the flowmeter. See the application note Reverse Flow Effects on TSI General Purpose Flowmeters for the correction for reverse flows.
2. Are there any special connection requirements for the analog output?
   Yes. The analog signal ground return is connected to the power ground inside the flowmeter. For this reason your equipment must use a voltmeter or analog input circuit with a differential input or floating ground. Failure to use this type of ground will result in measurement errors.
3. Are there correction factors for these different gasses?
   No. These flowmeters are separately calibrated for air and 100% O₂. Calibrations for the other gasses involves an internal algorithm in the meter. The desired gas is selected by an RS232 command. Once set, the LCD display indicates the gas calibration. The flow rate displayed on the LCD and the flowmeter’s outputs is then automatically corrected for the selected gas.
4. Are these flowmeters pressure compensated?
   Yes. The output readings are compensated for pressure changes as long as those pressures changes are within 0.5 to 2.0 atmospheres absolute pressure.
5. Are these flowmeters temperature compensated?
   Yes. The output readings are compensated for temperatures changes as long as those temperature changes are within the temperature-compensated range.
6. Can I change the scaling of the analog output signal?
   Yes. By using the "TSISetup.exe" untility program you can set 10 Volts to represent a flow 1 L/min to the full scale of the meter (interger values of L/min only). In addition, you can adjust the zero intercept of the analog output. Note that this is not a true zero adjust because the flowmeter’s analog output cannot go below zero Volts. These parameters can be changed by using the TSI Setup program that is supplied with the instrument or click here to download the program.
7. Can I clean the sensor in my flowmeter?
   No. The sensor element is not accessible without special factory tools. It is also fragile and would be damaged by attempts to clean it from the outside. NEVER attempt to clean the sensor by running liquids through it.
8. Can I operate my flowmeter in any orientation?
   Yes.
9. Can I slow down the response of the analog output signal?
   Yes. By using the "TSISetup.exe" utility program, the sample rate of the analog output can be set from 1 msec to 1 second.
10. Does humidity affect my readings?
    Yes. The flowmeters are calibrated with dry gas. Water vapor changes the gas properties. See the application note on humidity effects Correcting for Humidity Effects on TSI General Purpose Flow Meters.
11. How can I configure the flowmeter’s options?
    By using the RS232 interface, you can control a number of options on the flowmeter. These include:
    
    

    • Set the sample rate at which data is returned
    
    
    
    • Select the gas calibration to be used
    
    
    
    • Select either standard or volumetric units of flow
    
    
    
    • Set the beginning and end trigger levels for volume measurements
    
    
    
    • Set the analog output zero and span
    
    
    
    • Set the analog output sampling rate
    
    
    
    • Set the update rate for the LCD display
    
    
    
    • Set special display scroll options for the Model 4140
    
    
    
12. How do these flowmeters measure volume?
    They integrate flow rate over time to produce a volume measurement. The volume measurement is only available via the RS232 output.

    The START and STOP trigger criteria are controlled by RS232 settings. The start and stop triggers can be controlled by a flow or pressure. Also, the volume measurement can be set for a fixed amount of time. See the RS232 Command Set Manual for more information on volume measurements.

13. How often should I recalibrate my flowmeter?
    To maintain a high degree of accuracy in your measurements, TSI recommends that you return your instrument to the factory for an annual NIST traceable recalibration.
14. I need to develop custom software using LabView® to interface with the TSI flowmeter. What help is available?
    You can download a demonstration program called ”Real Time Demo Program” from our web site. This incorporates many common elements of control, data collection and display. The LabView® source code for this demo program can be downloaded from the web site as ”Source Code for Real Time Demo Program”.
15. Is there an RS-232 interface available on the flowmeter?
    Yes. The RS232 interface can be used to (1) select user options and settings, (2) obtain outputs of flow, volume, temperature, and pressure.
16. Please explain NIST traceability.
    NIST is the National Institute of Standards and Technology. All test and calibration data supplied by TSI has been obtained using standards whose accuracies are traceable to NIST or has been verified with respect to instrumentation whose accuracy is traceable to NIST.
17. What about other gasses and mixtures?
    Corrections for gasses not listed above are not available at this time. Correction algorithms for other gasses need to be developed and programmed into the flowmeter’s microcomputer by TSI. Additional gasses will be added in the future.
18. What are some applications for which these flowmeters are NOT designed?
    • Dirty or unfiltered gas
    
    
    
    • Liquids or condensing vapor
    
    
    
    • Pressure greater than 15 psig
    
    
    
    • Combustible mixtures
    
    
    
    • Gasses/mixtures that are not supported (see specs)
    
    
    
    • Hydrogen
    
    
    
    • Gasses outside the temperature range of 0-50°C
    
    
    
19. What are some typical applications for these flowmeters?
    • Production Testing
    
    
    
    • Quality Assurance
    
    
    
    • Product Development
    
    
    
    • Research
    
    
    
    • Field Service
    
    
    
    • Process Monitoring

    
    
20. What are the available outputs of volume data?
    The volume measurement is only available via the RS232 output. See the RS232 Command Set Manual for more information.
21. What data is available from the analog output?
    The analog output signal represents the flow rate. Temperature, pressure, and volume information are not available from the analog output.
22. What is the difference between Standard Flowrate and Volumetric Flowrate?
    Please download from our web site: Applications Note FLOW-Standard vs Volumetric.
23. What is the range and accuracy of the pressure measurement?
    The pressure range is 50-199 kPa (0.5 - 1.99 Bar, 7.3-28.9 psi) absolute.
    
    The pressure transducer will not be harmed by overpressure up to 620 kPa.

    The accuracy is ±1 kPa

24. What is the range of the analog output signal?
    0 to 10 Volts = 0 to full scale flow
25. What is the range of volume measurement?
    4040/4043/4045: 0.001 to 999.999 Liters
    
    4140/4143: 0.0001 to 99.999 Liters
26. What is the response of the pressure measurement?
    Less than 4 msec to 63% of the final value for a 30 kPa step change.
27. What is the response of the temperature measurement?
    Less than 75 msec to 63% of final value for a 20°C step change in temperature at full scale flow.
28. What is the response time of the flow measurement?
    Less than 4 milliseconds to 63% of final value at full scale flow.
29. Where is the pressure tap located?
    The pressure measurement is the absolute pressure inside the flow tube near the exit.