electromagnetic flow meter working principle
The working principle of electromagnetic flow meter is based on Faraday's law of electromagnetic induction. In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent
to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows through, the conductive
liquid moves in the magnetic field and cuts the magnetic field lines, and an induced electromotive force E perpendicular to the direction of movement and the direction of the magnetic field will be generated
at both ends of the conductor. This electromotive force is proportional to the flow rate V of the conductive liquid, that is, E = BLV (where B is the magnetic induction intensity, L is the length of the conductor,
and V is the speed of cutting the magnetic field lines).
Electromagnetic flowmeters determine the flow of conductive liquids by measuring the induced electric potential generated on electrodes on both sides of the pipe. Since the induced potential is proportional
to the flow rate, the flow rate of the fluid can be deduced by measuring the induced potential.
This measurement method has many advantages. For example, the measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. At the same time,
the electromagnetic flowmeter has no moving parts, no flow-blocking parts, no pressure loss, and no It will cause problems such as wear and clogging. Therefore, electromagnetic flowmeters have been
widely used in sewage treatment, chemical industry, metallurgy, papermaking, food and other industries.
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