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The long-term development of electromagnetic flowmeter - focus on microfluidic control technology

Electromagnetic flowmeter is a new type of flow measurement appearance developed rapidly in the 50th and 60th centuries following the development of electronic technology. Electromagnetic flowmeters are based on Faraday's law of electromagnetic induction, and electromagnetic flowmeters are used to measure the volumetric flow of conductive liquids. Because of its common strength has been widely used in the flow measurement of various conductive liquids in industrial processes, such as various acids, alkalis, salts and other corrosive media; electromagnetic flowmeters of various slurry flow measurement, formed a common application field.
In the past, verification of electromagnetic flowmeters had to be sent to specialized calibration and calibration equipment for inspection. However, with the development of electromagnetic flow meter manufacturing technology and the expansion of the use of occupations, the use of electromagnetic flow meters has become more and more numerous, and their calibers have become larger and larger, and it has become increasingly difficult to check back on calibration devices. Especially in the water supply occupation, because of the large diameter and professional characteristics, it is difficult to operate the metering system, which is time-consuming and difficult, and even impossible to remove.
In the past, the comparison of flow appearance selection was single. In recent years, following the research and development of flowmeters, flow appearance selections have taken shape from a single appearance to diversified appearances. New types of flowmeters such as high and medium pressure, high flow line ultrasonic flowmeters have been developed. Will be widely used. Companies based on the requirements of the ISO9001 quality management system, as the appearance of the electromagnetic flow meter, the need for regular inspection. For this reason, the users and producers of electromagnetic flow meters have always been eager to seek an online electromagnetic flow meter inspection method instead of the traditional offline calibration method.
In recent years, the commonly used electromagnetic flow meter online inspection methods at home and abroad: online calibration method for large-calibre electromagnetic flow meter. In the 1990s, the Shanghai Water System began to explore and verify online. They used a special analog signal detector to detect the converter. To test the resistance of the electrode to the liquid, check the insulation resistance and copper resistance of the excitation coil including the excitation connection cable, as well as the direct method of checking the excitation current output by the converter and checking the magnetic field strength. In the pipeline with stopped flow conditions, enter the hole near the sensor from the preset, check the electrode and fabric contamination, accumulation and clean.
Scientific instruments, such as electromagnetic flowmeters, are the most important tools for expressing knowledge and innovation in technology. They are also one of the thematic topics of scientific and technological innovation and an important manifestation of the achievements. The external appearance of the instrument is an important occupation for the measurement, testing, regulation, and manipulation of technical equipment for the various departments of the national economy. It is mainly based on mechanical system development and production of general-purpose instruments, and its appearance is complete. Over the years, China’s magnetic flowmeters have been agile in their careers and will develop in the direction of “six highs and one long” with high performance, high precision, high enthusiasm, high stability, high reliability, high environmental protection and long life.

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