Faraday's law of induction states that a metal rod moving in a magnetic field produces an electric voltage. This dynamo principle also governs how the electromagnetic flowmeter works.
As soon as the electrically charged particles of a fluid pass through the artificial magnetic field produced by the two field coils, an electric voltage is induced. This voltage, measured by two electrodes, is directly proportional to the flow rate and in the same way to the flow volume. The magnetic field is produced by a pulsed direct current with alternating polarity. This ensures a stable zero point and makes the flow measurement sensitive to multiphase or inhomogeneous fluids as well as low conductivity.
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