Electromagnetic flowmeters or magmeters are composed of a transmitter and sensor that together measure flow. The magnetic flowmeter’s sensor is placed inline and measures an induced voltage generated by the fluid as it flows through a pipe.
The principle of Electromagnetic Flowmeter (volumetric flowmeter) is based on Faraday’s law of electromagnetic induction. The coils of the flowmeter generate a magnetic field orthogonal to the flow direction. According to Faraday’s law of induction, a conductive liquid passing through the magnetic field induces a current between the two electrodes, which can be used to measure the voltage. The higher the flow velocity, the higher the induced voltage. This voltage signal is converted into a standard signal (eg, 4–20 mA or pulse) by the integrated electronics.
Electromagnetic flowmeters have basic applications for demanding flow and custody transfer (CT) measurements. They have designs and liner materials for various applications — from potable water to extremely adhesive, abrasive or aggressive fluids.
This electromagnetic flowmeter, being the non-intrusive type, can be used in general for any fluid that has a reasonable electrical conductivity greater than 5 μS/cm. Fluids like sand-water slurry, coal powder, slurry, sewage, wood pulp, chemicals, water other than distilled water in large pipelines, hot fluids, high viscous fluids specially in food processing industries, and cryogenic fluids can be metered by the electromagnetic flowmeter.
Modsen Electromagnetic Flowmeters with wafer and flanged versions have a large choice of nominal sizes from DN3 to DN3000.
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