Flowmeter FAQ’s

How does a Hoffer flow meter work?

Flow meter

Mounted within the body of a Hoffer liquid turbine flowmeter is a vaned rotor. The rotor is centered on a shaft and allowed to rotate by means of bearings. The shaft is supported in the housing by tube bundles that also provide a measure of flow conditioning for the fluid stream. The rotor is made from a ferromagnetic material or contains a magnet within the hub of the rotor.

Fluid flowing through the meter body engages the rotor forcing it to rotate. The rotational velocity of the rotor is proportional to the average linear velocity of the liquid flow stream. This rotational velocity is transformed into an electrical frequency signal by means of a non-intrusive sensor or coil threaded partially into the body of the meter aligned with the rotational circumference of the rotor. Being in close proximity to the ferromagnetic or magnetic rotor creates an electromagnetic coupling with the coil.

The output frequency of the coil then is directly proportional to the rotational velocity of the rotor. This frequency can then be converted to a flow rate indication or scaled signal by dividing the frequency by the meter’s scaling or K-factor (e.g. pulses per gallon or pulses/liter). The K-factor is established by factory calibration of the flowmeter at the time of manufacture.

For over forty-five years Hoffer Flow Controls has been designing and manufacturing quality turbine flowmeters and related process instrumentation. Hoffer Flow Controls specializes in cryogenic flowmeters, magnetic flowmeters, ultrasonic flowmeters and electronic flowmeters. We have expanded our product line to include but not limited to; Aerospace flowmeters, Oil and gas flowmeters, Industrial custody transfer flowmeters, Gas and liquid flowmeters (Power generation), WFI water flowmeters, Sanitary flowmeters, Military grade flowmeters and Subsea flowmeters.

Hoffer Flow Controls is committed to the quality system established by ISO 9001 that ensures our ultimate success by continually satisfying customer needs, improving performance, and making us competitive in the world market.


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  • Liquid Applications

    We provide best solutions that will meet the extreme conditions
    associated with your subsea and oil and gas applications.

    We provide best solutions that will meet the extreme conditions associated with your subsea and oil and gas applications.

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  • Gas Applications

    We offer complete flow measurement packages for the offshore drilling, production and well-servicing environments.

    We offer complete flow measurement packages for the offshore drilling, production and well-servicing environments.

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