Electromagnetic flowmeter in the wear-resistant use and selection of type

　　The ratio of large flow rate and small flow rate is generally more than 100:1, applicable to a wide range of industrial pipe diameter, large calibre up to 3m, the output signal and the measured flow rate into a linear, high degree of measurement of conductivity ≥ 1μs/cm of acid, alkali, salt solutions, water, sewage, corrosive liquids and mud, slurry conductive fluid flow. The current coal chemical industry Texaco gasifier in the coal slurry flowmeter in most of the design and selection of electromagnetic flowmeter, but the actual use of the effect of the difference is very large, this issue has been the coal chemical industry professionals to discuss the problem.

　　Electromagnetic flowmeter reasonable selection and correct installation to improve the measurement accuracy of the flowmeter and extend the life of the instrument, are extremely important. The selection of the following four principles: the measured fluid must be a conductive liquid, it can not measure gas, steam, petroleum products, glycerol, alcohol and other substances, the sensor lining is very important, must be stable, pressure-resistant, wear-resistant. Calibre and range selection. Flowmeter range according to the principle of not less than the expected value of the large flow rate to select the full-scale scale, commonly used flow rate more than 50% of the full scale, so that a higher measurement accuracy can be obtained. The commonly used flow rate is 2~4m/s suitable. The electrode should have a low noise electrode with noise reduction function.

　　Pressure selection: the use of pressure must be lower than the rated working pressure of the electromagnetic flowmeter, generally not more than 16 × 105Pa, the pressure resistance of the liner is also very critical, the liner can not make the electrode higher than the surface of the liner after extrusion. Temperature selection: the measured medium temperature can not exceed the allowable temperature of the lining material, in the high-pressure state, generally ≤ 120 ℃.