The operating principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. In an electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in Faraday's test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field.
When an electrically conductive medium flows through, an induced voltage is generated. Two electrodes inside the pipe measure the induced voltage generated. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrodes by means of a non-conductive lining (rubber, Teflon, etc.).
Electromagnetic flowmeter has the advantage of very small pressure loss, measurable flow range. The ratio of maximum flow rate and minimum flow rate is generally 20:1 or more, applicable to a wide range of industrial pipe diameter, up to 3m, the output signal and the measured flow rate into a linear, high accuracy, can measure the conductivity ≥ 5μs/cm of acid, alkali, salt solutions, water, sewage, corrosive liquids and mud, slurries, pulp and other fluid flow. But it can not measure the flow of gas, steam and pure water.
Hangzhou Economic Development Area，Hangzhou 310018，China
