Electromagnetic Flowmeter

 Electromagnetic Flowmeter
The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. 
The measuring tube of the flowmeter is a short tube of non-magnetic conductive alloy lined with insulating material.
Two electrodes are fixed on the measuring tube through the tube wall along the diameter of the tube. Its electrode tip 
is substantially flush with the inner surface of the liner. When the excitation coil is excited by the double-wave pulse,
A working magnetic field with flux density B will be generated in the direction perpendicular to the axis of the measuring tube. 
At this time, if a fluid with a certain conductivity flows through the measuring tube. The electromotive force E is induced by the 
cutting magnetic field lines. The electromotive force E is proportional to the magnetic flux density B, and the product of the 
inner diameter d of the measuring tube and the average flow velocity v is measured. The electromotive force E (flow signal) is 
detected by the electrodes and sent to the converter through the cable. After the converter amplifies the flow signal,
 it can display the fluid flow and output pulses.Signals such as analog current are used for flow control and regulation.


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