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technical article
Advantages of electromagnetic flowmeter for sewage measurement
2011-3-9 9:46:42

1) The electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity, and density of the measured medium and its conductivity (within a certain range). Therefore, the electromagnetic flowmeter can be used to measure the flow of other conductive liquids only after it has been calibrated with water.

2) The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar or turbulent) in a symmetrical distribution. Therefore, the range of the electromagnetic flowmeter is extremely wide, and its measurement range can reach 100: 1, and some even reach the operational flow range of 1000: 1.

3) The structure of the sensor of the electromagnetic flowmeter is simple, there are no moving parts in the measuring tube, and there are no throttling parts that hinder fluid flow. Therefore, it will not cause any additional pressure loss when the fluid passes through the flow meter, and it is one of the flow meters with the lowest energy consumption in the flow meter.

4) It can measure the flow of dirty media, corrosive media and suspended liquid-solid two-phase flow. This is because there are no obstructing flow parts inside the measuring tube of the instrument, and only the lining and electrodes of the measuring tube are in contact with the measured fluid, and the material can be selected according to the properties of the measured fluid. For example, using polytrifluoroethylene or polytetrafluoroethylene as the inner lining can measure various corrosive media such as acids, alkalis, and salts; the use of wear-resistant rubber as the inner lining is particularly suitable for measuring the wear of solid particles. Large liquid-solid two-phase flows such as mineral slurry and cement slurry, and various suspended liquids such as fiber-containing liquids and pulp.

5) The caliber range of industrial electromagnetic flowmeters is extremely wide, from a few millimeters to several meters, and there are already actual flow calibration equipment with a caliber of 3m in China, which has laid the foundation for the application and development of electromagnetic flowmeters.

6) The electromagnetic flowmeter has no mechanical inertia and is sensitive in response. It can measure instantaneous pulsating flow, and it can also measure flow in both directions.