Aalborg Xfm17S-Van6-A9-3Hd-02-Ss, Xfm Digital Mass Flow Meter Steel

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Aalborg, XFM17S-VAN6-A9-3HD-02-SS, XFM Digital Mass Flow Meter Stainless Steel, Viton-A Seals, 1/4" Compression, No Display, Universal 11 to 26 VDC, 0-5 VDC, Profibus, Hydrogen H2 0-20, mL/Min, 14.7 psia Metering Pressure, 21.1 Deg C / 70 Deg F Temperature Principle of Operation The stream of gas entering the Mass Flow transducer is split by shunting a small portion of the flow through a capillary stainless steel sensor tube

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According to principles of fluid dynamics, the flow rates of a gas in the two laminar flow conduits are proportional to one another

An output signal is generated that is a function of the amount of heat carried by the gases to indicate mass molecular based flow rates.

As gas flow takes place, heat is carried by the gas stream from the upstream coil to the downstream coil windings

Heat is transferred through the thin wall of the sensor tube to the gas flowing inside

In order to sense the flow in the sensor tube, heat flux is introduced at two sections of the sensor tube by means of precision-wound heater sensor coils

The geometry of the primary conduit and the sensor tube are designed to ensure laminar flow in each branch

The measured temperature gradient at the sensor windings is linearly proportional to the instantaneous rate of flow taking place

The remainder of the gas flows through the primary flow conduit

The resultant temperature dependent resistance differential is detected by the electronic control circuit

Therefore, the flow rates measured in the sensor tube are directly proportional to the total flow through the transducer