SN52 series electromagnetic flowmeter is a main flow instrument, which consists of two parts: sensor and converter. It works based on Faraday's electromagnetic induction law and is used to measure conductive liquid or two-phase medium. Its conductivity is generally required to be greater than 5 μ S/cm (the original conductivity of tap water is about 100-500 μ S/cm) can be used to measure various acid, alkali, salt solutions, pulp, mineral pulp and other media, but the media should not contain more ferromagnetic substances and a large number of bubbles. It is widely used in the fluid measurement of industrial departments such as petroleum, chemical industry, metallurgy, light textile, paper making, environmental protection, food, municipal management, water conservancy construction and other fields.