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There is a linear relationship between the output current of an electromagnetic flowmeter and the flow rate

2020-03-09View Original

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  There is a linear relationship between the output current of an electromagnetic flowmeter and the flow rate. And it is not affected by the physical properties of the liquid ; Therefore, after calibration with water, it can be used to measure the flow rate of other conductive liquids or solid-liquid two-phase media without any need for adjustments. As long as the lining and electrodes are in contact with the medium, and as long as the appropriate materials for these two components are selected, the vortex flow meter can achieve corrosion protection ; As long as the electrodes remain uncontaminated, the accuracy of the instrument will not decline over time. The SMART converter features a novel excitation method, offering low power consumption, stable performance, and high precision. Its flow rate range is as high as 100:1. It features convenient parameter setting, reliable programming, as well as self-check and self-diagnosis functions. It has no mechanical inertia, responds swiftly, and can measure dynamic flow rates. Calibration of electromagnetic flowmeters Electromagnetic flowmeters operate on the principle of Faraday’s law of electromagnetic induction. They consist of a sensor and a converter; in the case of steam flowmeters, the sensor is made up of a measurement tube lined with insulating material, counter electrodes installed through the walls of the measurement tube, as well as coils and an iron core used to generate the operating magnetic field. When a conductive medium flows through the sensor’s measurement tube, a stable magnetic field with a magnetic induction intensity of is generated by the transmitter in a region perpendicular to the flow direction of the medium. The conductive fluid, with an average flow velocity of, moves through this magnetic field area while cutting across the magnetic field lines. Thus, an induced electromotive force is generated on the two detection electrodes that are parallel to the cross-section of the pipe and perpendicular to the direction of the magnetic field lines. According to the law of electromagnetic induction, the instrument constant is a constant value once the pipe diameter D has been determined and the magnetic flux density remains unchanged. At this point, the induced electromotive force is linearly related to the volumetric flow rate; that is, by measuring the induced electromotive force E, the volumetric flow rate q of the medium can be determined.   Based on the characteristics of the medium being measured and the advantages of electromagnetic flowmeters, it can be seen that they are highly suitable for chlorine-alkali metering. Although electromagnetic flowmeters are relatively expensive, they offer high precision, require little maintenance, have a long service life, and thus provide good cost-performance. Differential pressure flowmeters, turbine flowmeters, gear flowmeters, etc., all experience increased measurement errors due to the operating conditions of the fluid as well as parameters such as fluid density and viscosity. The service life of the measuring elements is reduced due to wear caused by solid particles, and they may even become clogged and unusable; moreover, the issue of corrosion cannot be resolved. Our factory once used elliptical gear flow meters to measure diaphragm electrolyte, but they had to be discontinued due to blockages caused by the precipitation of salts in the electrolyte; eventually, electromagnetic flow meters were used instead. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content!

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