Instruction Manual - Sierra Instruments

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Sierra Instruments Instruction ManualSmartTrak ® 100 SeriesFigure 1-3. Sensor Temperature DistributionFigures 1-2 and 1-3 show the mass flow through the sensor tube as inverselyproportional to the temperature difference of the coils. The coils are legs of a bridgecircuit with an output voltage in direct proportion to the difference in the coils’resistance; the result is the temperature difference (∆T). Two other parameters, heatinput (H) and coefficient of specific heat (Cp) are both constant. Through carefuldesign and attention to these parameters, this output signal is made linear over thetransducer’s normal operating range (Figure 1-4). As a result, the measured flowthrough the sensor tube is directly proportional to the gas flow in the main body.Figure 1-4. Linear Range of the Transducer’s Output SignalIn the SmartTrak mass flow controllers, the gas which flows through themonitoring section is precisely regulated by the built-in electromagnetic valve. Thenormally closed valve is similar to an on/off solenoid valve, except that the currentto the valve coil, and hence the magnetic field, is modulated so that theferromagnetic valve armature, or valve plug, assumes the exact height above thevalve’s orifice required to maintain the valve’s command flow (set point). Theresult is excellent resolution.10
Sierra Instruments Instruction ManualSmartTrak ® 100 SeriesCHAPTER 2 INSTALLATIONWarning!Injury can result if linepressure exceeds themaximum rating of500 psig (34 barg).Before You Begin InstallationBefore installing the instrument, ensure that the installation site conforms to thespecific operating parameters recorded on the instrument’s Data Label. The DataLabel is mounted on the back of the instrument electronics enclosure (see sampleData Labels in Figure: 2-1). This is critical because each instrument is configuredfor a specific application range. Please review the gas or gases, the mountingorientation, the maximum flow range(s), the inlet and outlet pressure(s), and theoperating temperature(s). The line pressure should not exceed 500 psig (34 barg).The temperature should not exceed 122°F (50°C). The minimum operatingtemperature is 32°F (0°C) and ambient temperature is 0-50°C. If your applicationexceeds any of these parameters, contact your Sierra Sales Agent beforeinstallation. You may also contact one of Sierra’s Technical Support Centers.FACTORY USA: TOLL FREE: 800-866-0200 or PHONE: 831-373-0200 or FAX:831-373-4402 or EMAIL: service@sierrainstruments.comFigure 2-1: Examples of SmartTrak Data Labels11
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Instruction Manual - Sierra Instruments

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