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Working principle and characteristics of electromagnetic flowmeters

2020-08-26View Original

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Working principle of electromagnetic flowmeters: 1. It consists of a sensor and a converter. It operates based on Faraday’s law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a high conductivity; it is an inductive instrument for measuring the volumetric flow rate of conductive media.   2. In addition to measuring the volumetric flow rate of ordinary conductive liquids, it can also be used to measure the volumetric flow rate of highly corrosive liquids such as strong acids and strong bases, as well as of homogeneous liquid-solid two-phase suspensions such as sludge, pulp, and paper pulp. It is widely used for flow measurement in various industrial sectors such as petroleum, chemicals, metallurgy, light textiles, papermaking, environmental protection, and food processing, as well as in areas like municipal management, water conservancy construction, and river dredging.   3. The electromagnetic flowmeter consists of a transmitter and a converter. The electromagnetic flow transmitter is made up of components such as a magnetic circuit system, a measurement tube, electrodes, a housing, and an interference signal adjustment device; it converts changes in flow rate into changes in induced electromotive force.   4. The converter is composed of electronic components; it amplifies the weak induced voltage and converts it into a standard signal for output, so as to enable remote indication, recording, accumulation, and regulation.   The above is an explanation of the product’s principle provided by the editor. So, what are the features of this product, as explained further by the editor? Features of electromagnetic flowmeters: 1. The measurement is not affected by changes in fluid density, viscosity, temperature, pressure, or conductivity.   2. The converter adopts a novel excitation method, featuring low power consumption, stable zero point, and high precision.   3. Select the sensor lining and electrode materials appropriately, that is, ones with good corrosion and wear resistance.   4. There are no components that impede flow inside the measuring tube, resulting in no pressure loss; the requirement for straight sections is low. It has a unique adaptability for slurry measurement.   5. The measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure, or conductivity. The voltage signal generated by the sensor is linearly related to the average flow velocity, thereby ensuring high measurement accuracy.   6. The converter can be integrated or separate from the sensor.   7. Since the induced voltage signal is generated throughout the space filled with magnetic field and represents an average value over the cross-section of the pipe, the straight pipe section required for the sensor is short, with a length of 5 times the pipe diameter.   8. There are no flow-blocking elements inside the pipeline, so there is no additional pressure loss ; There are no moving parts inside the measurement pipeline, so the sensor has an extremely long lifespan.   The above is all the information about electromagnetic flowmeters that the editor has shared with you; I hope it will be helpful to everyone.

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