Magnetic inductive flow meter (EMF for short) is a meter for measuring the volumetric flow rate of conductive liquid, which is made by using Faraday's electromagnetic induction law. In the early 1950s, the magnetic flow sensor (EMF) realized industrial application. In the late 1970s, the low-frequency rectangular wave excitation method was widely used to gradually replace the earlier-used power-frequency AC excitation method.
In recent years, magnetic inductive flow sensor has developed rapid, and global production of mag metre in 2005 is estimated to be more than 200,000 units. At present, large size full bore electromagnetic flow meters are mostly used in water supply and drainage projects, and small- and medium-size mag flow sensors are often used to measure liquids ,such as slurry, pulp, acid, corrosive which is difficult-to-measure. Difficult applications Such as measuring the pulp and black liquor of the paper industry, pulp of non-ferrous metallurgy industry, coal slurry of coal preparation plant, strong corrosive liquid of chemical industry, cooling water control and monitoring leakage of blast furnace tuyere of steel industry, long-distance pipeline coal hydraulic flow Measurement and control. Small size and micro size electro magnetic flowmeters are often used in places with hygienic and sanitary requirements such as the pharmaceutical industry, food industry, and biological engineering.
The magnetic flowmeter is a flowmeter that measures flow according to Faraday's law of electromagnetic induction. Inductive flow meter has wide range of measurable flow rate. The ratio of the maximum flow rate to the minimum flow rate is generally 20: 1 or more. It is suitable for a wide range of industrial pipe diameters, up to 2m. The output signal is linear with the measured flow rate, and has high accuracy normally with 0.5%. It can measure fluids with electrical conductivity ≥5μs / cm. Mag meter can be used to measure acid, alkali, salt solution, water, sewage, corrosive liquid and fluid flow of mud, pulp, slurry, etc. But magnetic inductive flow meter cannot measure the flow of gas, steam, oil and pure water.
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