Magnetic flow meters only have two non-moving parts that contact the measured fluid media – a liner which protects the flow body from the fluid and a pair of electrodes which detect the velocity of the flowing fluid. Compared to traditional mechanical flow measurement techniques such as turbine and positive displacement which measure flow by relying on rotating mechanical gears and bearings, the mag meter’s simple construction provides for longer life, less maintenance, lower pressure drop, and overall lower cost of ownership. This flow measurement design allows magnetic flow meters to be used with virtually any conductive liquid regardless.
Magnetic flow meters rely Faraday’s law of electromagnetic induction which states that an inductive voltage is generated when a conductor moves through a magnetic field. Inside of the mag meter’s flow tube, when a conductible fluid passes through the magnetic field generated by the meter’s electromagnetic coils at a right angle to the field, the voltage induced at the electrode is directly proportional to the density of the magnetic field, the distance between the sense electrodes, and the velocity of the fluid. Therefore, the voltage measured across the meter’s electrode, measured in mV, is directly proportional to the fluid velocity of the measured media. Since the area inside of the flow tube is a known quantity, the measured velocity can then very easily be used to accurately calculate the volumetric flow rate through the meter.
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