Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction.Flowmeter measurement tube is a lining insulation of permeability alloys short tube.Two electrodes along diameter direction through the wall on the measuring tube.The electrode head and basic flush lining the inner surface.The bi-directional square wave pulse excitation coil excitation, will be in a direction perpendicular to the axis measuring tube to produce a magnetic field of magnetic flux density of B work.At this point, if a certain electrical conductivity of the fluid flowing through the measuring tube, will cut magnetic induction electromotive force E.Electromotive force E is proportional to the magnetic flux density B, sounding pipe diameter d, and v is the product of the average flow.Electromotive force E (traffic signal) by the detection electrode and through the cable to the converter.Converter will flow signal amplification processing, can display the fluid flow, and can output pulse, analog signals, such as current used for flow control and regulation.
Chemical Flow Meter :http://www.kunlunsensors.com/newspage.php?nid=166
chemical flow meters liquid :https://www.youtube.com/watch?v=qa5QgeKSDok
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