Operation of Electromagnetic Flowmeters
What is Instrumentation
June 24, 2017Pitot Flowmeter
July 3, 2017
Operation of Electromagnetic Flowmeters
Electromagnetic flowmeters operate based on Faraday's law of electromagnetic induction.
Naturally, in this case, the fluid must have a minimum required conductivity to carry the electric current and generate the magnetic flux (around 10 µS/cm). Electromagnetic flowmeters typically operate at temperatures up to 260°C. The liner inside the flowmeter, depending on the application, is made of materials such as PTFE or hard rubber.
In the figure above, U is the induced voltage resulting from the fluid moving in the magnetic field B. It is proportional to the distance between the two electrodes D, the fluid velocity V, and the constant K.
