Electromagnetic Flow meters are based on Faraday's Law of Electromagnetic Induction. In an Electromagnetic Flow meter, the magnetic field is generated by a set of coils. As the conduc tive liquid passes through the electromagnetic field, an electric voltage is induced in the liquid, which is directly proportional to its velocity. Electromagnetic Flow Meter Size:- inch or mm PTFELining Power230VAC/24VDC Working on telemetric.