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Electromagnetic Flow meter ​Working Principles

May 26, 2017

Electromagnetic Flow meter Working Principles

1.Measuring Principles

The measuring principle of electromagnetic flowmeter is based on the electromagnetic induction law of Farady. 

The sensor is mainly composed of measuring tube with isolate lining, a pair of electrodes installed by penetration

of the measuring tube wall, a pair of coils and iron core to produce working magnetic field. When the conductive 

fluid flows through the measuring tube of the sensor, the voltage signal in direct proportion to the average flow 

velocity of the fluid will be inducted on the electrodes. The signal is amplified and treated by the transmitter to 

realize various display functions.


  Electromagnetic flow meter1.jpg

 2.Converter Circuit Schematic

The converters supplies a stable exciting current to the coil in the sensor of electronetic flowmeters to get 

B constant and amplifies the electromotive force and convert it into standard signals of current or frequency 

so that the signals can be used for displaying, controlling and processing. The schematic of converter circuit is 

shown in Fig.1

 electromagnetic flow meter.jpg