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Advantages and precautions of electromagnetic flowmeters

2019-11-20 View Original

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  With the advancement of technology, electromagnetic flowmeters are being used more and more in industrial production. As is well known, in oil refining or chemical manufacturing, some liquids possess electrical conductivity; therefore, using electromagnetic flowmeters is the most effective method for measuring flow rates.   The main advantage of electromagnetic flowmeters is their ability to measure the flow rate of acids, alkalis, as well as liquids containing solid particles or fibers. They are used in a wide range of applications, including industries such as drinking water treatment, chemical manufacturing, beverage production, and sewage treatment. Electromagnetic flowmeters have many advantages. Firstly, the structure of their sensors is quite simple; there are no moving parts inside the measuring mechanism, nor are there any throttling elements that could impede the flow of fluid. As a result, when fluid flows through an electromagnetic flowmeter, no losses occur. Currently, electromagnetic flowmeters are among the flow meters with the lowest energy consumption available on the market.   It can measure the flow rate of dirty media as well as corrosive liquid-solid mixtures, and since there are no components inside the electromagnetic flowmeter that could impede flow, the only parts that come into contact are those on the inner surface of the measurement tube and the electrodes. Of course, the material depends on the properties of the fluid to be measured.   If polytetrafluoroethylene is used, it can be employed to measure substances such as acids, bases, and salts. Of course, when measuring solid particles or slurries with high wear levels, a wear-resistant rubber lining is required.   An electromagnetic flowmeter is a device for measuring volume. Throughout the measurement process, it is not affected by factors such as the temperature, viscosity, or conductivity of the medium; therefore, after calibration using water, it can be used to accurately measure the flow rate of conductive liquids.   The output of an electromagnetic flowmeter is generally proportional to the average flow velocity. It has a very wide measurement range, which can be as high as 100:1 or even 1000:1.   Of course, electromagnetic flowmeters can also measure flow in both forward and reverse directions, and they are capable of detecting instantaneous pulsating impulses, with a rapid response throughout the process. There is no need to worry about the diameter of electromagnetic flowmeters; their diameter can range from a few millimeters to several meters. In China, devices with a diameter of around 3 meters have already been developed, which represents a significant advancement for electromagnetic flowmeters.   The only limitation of electromagnetic flowmeters is their inability to operate in high- or low-temperature conditions. Due to the properties of the lining materials, they cannot be used to measure media at high temperatures, nor can they accurately measure media at low temperatures, as the extremely low temperatures may damage the insulation properties. To ensure economic efficiency, it is first necessary to establish requirements for measurements as well as for the use of instruments in specific situations; for example, in trade settlements or energy measurement, instruments with higher precision are required.   However, in cases where control is required, electromagnetic flowmeters with different precision levels can be selected. Even if it is only necessary to measure the flow rate, then precise control is not required; it is acceptable to use a meter with slightly lower accuracy, and such electromagnetic flowmeters are relatively cheaper as well.   The full-scale flow rate for typical electromagnetic flowmeters ranges from 0.5 to 12 m/s, which is a fairly wide range; therefore, the choice of pipe diameter for such instruments also varies. The first thing to determine is whether the desired flow rate falls within this range, and then the appropriate diameter of electromagnetic flowmeter should be selected based on specific requirements. For more information, please visit the company’s official website at http://www.yb1518.com/. Please keep this link when reproducing the content! http://www.yb1518.com/UploadFiles/2012717174126829.jpg

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