Electromagnetic flow meter is a kind of induction instrument designed by Faraday’s law of electromagnetic induction to measure flow of conductive media in the tube. It adopts the technology of insertion of single chip to realize digital excitation and employs CAN local fieldbus. Electromagnetic flow meter can realize local indication and output electrical current signal of 4-20mA which can be used to record, adjust and control. Electromagnetic flow meters are widely used in industrial sectors such as chemical industry, environmental protection, metallurgy, pharmaceutical, paper making, water supply and removal etc. Besides measuring flow of general conductive liquid electromagnetic flow meter can measure flow of liquidsolid mixed fluid, high-viscosity fluid and salt, strong acid and strong alkali.