Electromagnetic flowmeter is composed of sensor and converter. It works on Faraday' s electromagnetic induction principle, used for the measuring of volumetric flow rate of liquids whose conductance is 5 ¼ S/ cm or bigger. It also can measure the corrosive liquids as strong acid, alkali etc. and two phase( liquid-solid) suspensions as mud, ore pulp, paper pulp, etc. It is widely applied in the field of petroleum, chemical industry, metallurgy, textile, papermaking, environmental protection, food and municipal administration, irrigation project, river dredge