What is the difference between magnetic flow meters and magnetically coupled flow meters?
The measurement principle of magnetic or electromagnetic flow meters is based on Faradays Law of Electromagnetic Induction. These meters contain no moving parts.While as in magnetically coupled meters, measurement is not based on Faradays law, but is based on rotation of wheel with velocity of liquid. The rpm value of this rotating wheel is transferred to the outside measurement scheme by magnetic coupling. Turbine type and peddle wheel type meters usually use this scheme. These meters are having moving parts and s limitations on accuracy as well as durability and capacity to measure minimum velocity signal. Magnetically coupled meters are some times mistaken as magnetic or electromagnetic flow meters.
