Sierra's Mass-Trak thermal MFC (mass flow controller) allows reliable and inexpensive measurement and control of gas mass flow. This quality instrument features a built-in display of measured mass flow and a set point potentiometer, by which the mass of gas that passes through the controller can be adjusted. This set point may also be controlled via an external signal source when using process controllers, PLCs, etc. Available in ranges from 0 to 10 sccm to 0 to 50 slpm, the MFC is suitable for any clean, noncorrosive gas flow control application.
How it works
The flow of gas enters the meter and splits into two paths - one through a sensor tube, the other through a bypass. This bypass creates the pressure drop that forces a small known fraction of the mass to flow through the sensor tube. Two temperature detectors, wrapped around the sensor tube, direct a constant amount of heat through the thin walls of the tube into the gas stream. In operation, the gas carries heat from the upstream coil to the downstream coil, making it hotter. The difference in coil temperatures is directly proportional to the mass flow rate of the gas. As the gas leaves the flow measurement element, it enters a built-in electromagnetic control valve, which maintains the desired flow rate.
Sierra's thermal mass flow controller is a reliable and surprisingly economical unit which measures flow to an accuracy of ±1,5% and controls the flow between 2 and 100% of full scale.
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