An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of a conductive fluid based on the electromotive force generated when the fluid passes through an external magnetic field.
The basic principle of an electromagnetic flowmeter is to install a pair of magnetic poles N and S outside a pipeline made of generally non-magnetic materials to generate a magnetic field. Its advantages are minimal pressure loss and a wide range of measurable flow rates. The ratio of flow rate to minimum flow rate is generally above 20:1, and the applicable industrial pipe diameter range can be as wide as 3m. The output signal is linear with the measured flow rate and has high accuracy.
