Magnetic circuit system: its role is to produce a uniform DC or AC magnetic field. DC magnetic circuit with a permanent magnet to achieve the advantage of the structure is relatively simple, subject to the interference of the AC magnetic field is small, but it is easy to make the measurement of the electrolyte within the catheter polarization, the positive electrode surrounded by negative ions, negative electrode positive ions Surrounded by the polarization of the electrode, and lead to increased resistance between the two electrodes, thus seriously affecting the normal work of the instrument. When the pipe diameter is larger, the corresponding permanent magnets are also large, cumbersome and uneconomical, so the electromagnetic flowmeter generally use alternating magnetic field, and is 50HZ frequency power excitation generated.
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