Advantages of electromagnetic flowmeters in measuring sediment-containing wastewater

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1. Electromagnetic flowmeters have no mechanical inertia, are highly responsive, and can measure instantaneous pulsating flow rates, as well as flow in both forward and reverse directions. 　 2. The output of an electromagnetic flowmeter is proportional only to the average flow velocity of the medium being measured, and it is independent of the flow regime under symmetric conditions (laminar or turbulent). Therefore, electromagnetic flowmeters have an extremely wide measurement range; their ratio can reach 100:1, and in some cases even 1000:1 for the operational flow range. 3. The sensor of the electromagnetic flowmeter has a simple structure; there are no moving parts inside the measurement tube, nor any throttling elements that could impede fluid flow. Therefore, when fluid passes through the flow meter, it does not cause any additional pressure loss, making it one of the flow meters with the lowest operating energy consumption. 4. Industrial electromagnetic flowmeters come in a very wide range of diameters, from a few millimeters to several meters. In China, there are already flow calibration devices with a diameter of 3 meters, which lays the foundation for the application and development of electromagnetic flowmeters. 5. An electromagnetic flowmeter is a device for measuring volumetric flow rate; during measurement, it is not affected by the temperature, viscosity, density, or conductivity of the fluid being measured (within certain limits). Therefore, after being calibrated with water, an electromagnetic flowmeter can be used to measure the flow rate of other conductive liquids. 6. It can measure the flow rate of contaminated media, corrosive media, and suspension-type liquid-solid two-phase flows. This is because there are no components that impede flow inside the instrument’s measuring tube; only the lining of the measuring tube and the electrodes come into contact with the fluid being measured, and their materials can be selected based on the properties of that fluid. For example, using polytrifluoroethylene or polytetrafluoroethylene as a lining allows for the measurement of various corrosive substances such as acids, bases, and salts ； With a wear-resistant rubber lining, it is particularly suitable for measuring slurry and cement slurry alike, which are two-phase flow systems containing solid particles and subject to significant wear, as well as various suspended liquids such as those containing fibers and pulp.