Electromagnetic type flowmeters work on the principle of faraday’s law which states that the induced EMF in any closed circuit is equal to the rate of change of magnetic flux through the circuit.
E = dB/dt
EMF is the force exerted on charged particles
Change in magnetic flux can be done in many ways such as
Moving a magnet towards and away from a circuit
Rotating a circuit/coil inside a magnetic fiel
By a conductor cutting a magnetic flux. The conductor will experience a change in magnetic flux in the circuit hence creating the EMF
Similarly, in an electromagnetic type flowmeter,
The conductor is the liquid
Coils are used to generate a gradient magnetic field
As the liquid (conductor) flows, it will experience a change in magnetic flux, thus creating an EMF.
The EMF generated is proportional to flow rate since a higher flow will experience a higher change in magnetic flux
There will be an electrode which is used to pick up the voltage of the liquid with reference to ground
Picture of Electromagnetic type flowmeter
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