Electromagnetic Flowmeter Structure（1）

The structure of the Electromagnetic Flowmeter is mainly composed of a magnetic circuit system, a measuring conduit, an electrode, a casing, a lining and a converter.

1. Magnetic circuit system: its function is to produce a uniform DC or AC magnetic field. The DC magnetic circuit is realized with a permanent magnet. The structure is simple, the interference by the alternating magnetic field is small, and the electrolyte liquid is easily polarized, so that the positive electrode is surrounded by negative ions, the negative electrode is surrounded by positive ions, and the internal resistance between the two electrodes is increased, thereby seriously affecting the normal operation of the instrument.

2. Measuring catheter: its function is to let the conductive liquid to be tested pass. In order for the magnetic lines to be shunted or short-circuited, the measuring tube must be made of a material that is non-magnetic, low in electrical conductivity, low in thermal conductivity, and mechanically strong. Non-magnetic stainless steel, FRP, high-strength plastic, aluminum, etc. are available.

3. Electrode: Its function is to induce and measure the induced potential signal proportional to it. The electrodes are typically made of non-magnetically conductive stainless steel and are required to be flush with the liner so that the fluid passes unobstructed. It should be installed in the vertical direction of the pipe to prevent deposits from accumulating on it and affect the measurement accuracy.

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