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Composition of electromagnetic flowmeter

  • September 1,2020.

The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring catheter, electrode, shell, lining and converter.

Magnetic circuit system: Its function is to produce a uniform DC or AC magnetic field.Dc magnetic circuit to realize with magnet, its advantage is simple structure, small influence of the ac magnetic field, but it is easy to make by measuring the electrolyte liquid polarization in the ducts, the positive electrode is surrounded by negative ion, negative electrode is surrounded by positive ions, the electrode polarization, and leading to the production of two electrodes in locust internal resistance increases, thus seriously affect the normal work of the instrument.When the diameter of the pipeline is large, the magnet is correspondingly large, bulky and uneconomical. Therefore, the electromagnetic flowmeter generally adopts alternating magnetic field and is stimulated by 50HZ power supply with power frequency.

Measuring conduit: Its function is to allow the conductance liquid to pass through.In order to shunt or short circuit the magnetic flux when the magnetic field line passes through the measuring conduit, the measuring conduit must be made of non-magnetic, low conductivity, low thermal conductivity and materials with certain mechanical strength, non-magnetic stainless steel, glass fiber reinforced plastics, high-strength plastics, aluminum, etc.

Electrode: Its function is to induce the electric potential signal which is proportional to the measured.The electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that fluid flow is unimpeded.It should be installed in the vertical direction of the pipeline, in order to prevent sediment accumulation on it and affect the measurement accuracy.

Enclosure: made of ferromagnetic material, it is the enclosure of the excitation coil of the distribution system and isolates the interference of the external magnetic field.

Lining: There is a complete electrical insulation lining on the inner side of the measuring conduit and the flange sealing surface.It is directly in contact with the measured liquid and its function is to increase the corrosion resistance of the measuring conduit and prevent the induced potential from being short-circuited by the metal measuring conduit wall.Lining materials for corrosion resistance, high temperature resistance, wear - resistant polytetrafluoroethylene plastics, ceramics, etc.

Converter: The induction potential signal generated by liquid flow is very weak, and is greatly affected by various interference factors. The function of the converter is to amplify the induction potential signal and convert it 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 and convert it into a unified standard DC signal.

Related products: electromagnetic water meter, ultrasonic flow meter

NONCON electromagnetic flow meter

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