Electromagnetic flowmeter manufacturers check the sensor
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Test equipment: 500MΩ insulation resistance tester, a multimeter.
Test steps:
1: When the pipeline is full of media, use a multimeter to measure the resistance between terminals A, B and C. The resistance between AC and BC should be equal to large. If the difference is more than 1 time, it may be the leakage of the electrode, the measurement of the outer wall of the tube or the adsorption of condensed water in the junction box.
2: In case of lining drying, use MΩ meter to measure the insulation resistance between AC and BC (should be greater than 200MΩ). Then use a multimeter to measure the resistance of the two terminals in the terminals A, B and the measuring tube (should be short-circuit connected). If the insulation resistance is very small, indicating electrode leakage, the entire flowmeter should be returned to the factory for repair. If the insulation is reduced but there is still more than 50 MΩ and the inspection result of step (1) is normal, the outer wall of the measuring tube may be damp, and the interior of the housing may be dried by a hot air blower.
3: Use a multimeter to measure the resistance between X and Y. If the resistance exceeds 200Ω, the excitation coil and its lead wire may be open or have poor contact. Remove the terminal board check.
4: Check the insulation resistance between X, Y and C, should be more than 200MΩ. If there is a drop, use hot air to dry the inside of the shell. In actual operation, a decrease in coil insulation will lead to an increase in measurement error and an unstable output signal of the instrument.
5: If it is determined that the sensor is faulty, please contact the manufacturer of the electromagnetic flowmeter. Usually, the scene cannot be solved and it is necessary to repair the sensor.