Information on Electromagnetic Flow Meter
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The most common flowmeter, apart from the mechanical flow meters, is the magnetic flow meter. A magnetic field is applied to the metering tube, which results in a potential difference proportional to the flow velocity perpendicular to the flux lines. The physical principle at work is electromagnetic induction. The magnetic flow meter requires a conducting fluid, for example, water that contains ions, and an electrical insulating pipe surface, for example. a rubber-lined steel tube.