The GFM design combines the convenience and accuracy of conventional mass flow devices with low costs previously unattainable.

Each of these meters incorporate an advanced straight tube sensor in conjunction with flow pas sage elements constructed of aluminum and brass for non-corrosive gases or 316 stainless steel for corrosive applications.

• Rigid metallic construction.
• Maximum pressure of 500 psig(34.5 bars).
• Leak integrity 1 x 10 sccs of helium.
• NIST traceable certification.
• NIST Build in tiltable LCD digital readout.
• 0-5 Vdc and 4-20 mA signals.

  Circuit protection.

• Can be used as a portable device.
• Engineering units or 0 to 100% displays.
• Totalizer option.
  Principles of Operation

  Metered gases are divided into two laminar flow paths, one through the primary flow conduit, and the other through a capillary sensor tube. Both flow conduits are designed to ensure laminar flows and therefore the ratio of their flow rates is constant.

  Two precision temperature sensing windings on the sensor tube are heated, and when flow takes place, gas carries heat from the upstream to the downstream windings. The resultant temperature differential is proportional to the change in resistance of the sensor windings.

  A Wheatstone bridge design is used to monitor the temperature dependent resistance gradient on the sensor windings which is linearly proportional to the instantaneous rate of flow.

  Output signals of 0 to 5Vdc or 4 to 2OmA are generated indicating mass molecular based flowrates of the metered gas.

  Flowrates are unaffected by temperature and pressure variations within stated limitations.

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