The structure of the electromagnetic flowmeter is mainly composed of magnetic circuit systems, measuring conduits, electrodes, housings, linings, and converters.
Magnetic circuit system: Its role is to produce a uniform DC or AC magnetic field. The DC magnetic circuit is realized by a permanent magnet. The advantage is that the structure is relatively simple and less disturbed by the AC magnetic field, but it is easy to polarize the electrolyte liquid in the measurement conduit so that the positive electrode is surrounded by negative ions and the negative electrode is positive ions. Enclosing, that is, the polarization phenomenon of the electrode, and resulting in an increase in the internal resistance between the two electrodes, thus seriously affecting the normal operation of the instrument. When the pipe diameter is larger, the permanent magnet is also relatively large, heavy and uneconomical, so the electromagnetic flowmeter generally uses an alternating magnetic field, and is generated by 50HZ power frequency power supply excitation.
Measuring catheter: Its role is to allow the measured conductive liquid through. In order to make the magnetic flux to be diverted or short-circuited when passing through the measuring tube, the measuring tube must be made of non-magnetic material, low conductivity, low thermal conductivity, and a certain mechanical strength. Stainless steel, glass fiber reinforced plastic, high strength without magnetic permeability Plastic, aluminum and so on.
Electrode: Its role is to derive and be measured in proportion to the induced potential signal. The electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that the fluid passes unimpeded. Its installation position should be in the vertical direction of the pipeline to prevent deposits from accumulating on it and affect the measurement accuracy.
Enclosure: Made of ferromagnetic material, it is a housing that distributes the excitation coil and isolates the interference from external magnetic fields.
Lining: There is a complete, electrically insulating liner on the inside of the measuring tube and on the flange sealing surface. It is in direct contact with the liquid to be measured. Its role is to increase the corrosion resistance of the measuring tube and prevent the induced potential from being short-circuited by the metal measuring tube wall. Lining materials are mostly corrosion-resistant, high-temperature resistant, wear-resistant polytetrafluoroethylene plastics, ceramics and so on.
Converter: The induced potential signal generated by the liquid flow is very weak, and is greatly affected by various interference factors. The role of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main interference signal. Its task is to amplify the induced potential signal Ex detected by the electrode into a uniform standard DC signal.
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