Electromagnetic flowmeter regular inspection test items

Abstract: The information of electromagnetic flowmeter regular inspection and test items is provided by excellent flowmeter and flowmeter production and quotation manufacturers. What is the routine maintenance of the electromagnetic flowmeter described by Xianghui Instruments? According to the first electromagnetic induction principle of the flange, a pair of detection electrodes are installed on the pipe wall perpendicular to the measuring pipe axis and the magnetic field line. When the conductive liquid moves along the axis of the measuring tube, the conductive liquid cuts. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the electromagnetic flowmeter regular inspection and test items. What are the routine maintenance, regular inspection and test items of the electromagnetic flowmeter introduced today? According to the principle of Fara's first electromagnetic induction, a pair of detection electrodes are installed on the pipe wall perpendicular to the measuring pipe axis and the magnetic field line. When the conductive liquid moves along the axis of the measuring tube, the conductive liquid cuts off the magnetic field lines to generate an induced potential, which is detected by two detection electrodes. This value is proportional to the flow rate, and its value is E=B*V*D*K, where E is the induced potential and B is the magnetic induction. d is the electrode spacing; k is a coefficient related to the axial length of the magnetic field distribution; the sensor takes the induced electromotive force as a flow signal and transmits it to the converter. After signal processing such as amplification, transformation and filtering, the instantaneous flow and accumulated flow are displayed by a dot matrix liquid crystal with backlight. The daily maintenance of the electromagnetic flowmeter only requires regular visual inspection of the instrument, check the environment around the instrument, remove dust and dirt, ensure that there is no water and other substances, check whether the wiring is good, and check whether there is a new device or instrument with strong electromagnetic fields near the instrument Check for new wires. If the measuring medium easily contaminates the electrode or deposits and scales on the measuring tube wall, it should be cleaned regularly. 1. Troubleshooting When the flowmeter is put into operation or put into normal operation for a period of time, it is found that the instrument is not working properly. First, check the external conditions of the flowmeter, such as whether the power supply is good, whether the pipeline is leaking, whether there are air bubbles in the pipeline, whether the signal cable is damaged, and whether the output signal of the converter (ie, the input circuit of the rear meter) is open. Remember to blindly disassemble and repair the flowmeter. Second, the sensor inspection and testing equipment: a 500MQ insulation resistance tester and a multimeter. Test steps: (1) When the pipe is full of medium, measure the resistance between terminals A, B and C with a multimeter, and the resistance between terminals A-C and B-C should be as large as possible. If the difference is more than 1 times, it is possible that the electrode is leaking, and the condensed water is adsorbed on the outer wall of the measuring tube or in the junction box. (2) When the lining is dry, measure the insulation resistance between alternating current and alternating current with a megohmmeter (should be greater than 200 megohms). Then measure the resistance between terminals A and B and the two electrodes in the measuring tube with a multimeter (should be in short-circuit communication). If the insulation resistance is very small, which means the electrodes are leaking, the entire flowmeter should be returned to the factory for maintenance. If the insulation is reduced but still higher than 50MQ, and the inspection in step (1) is normal, it is possible that the outer wall of the measuring tube is wet, and the inside of the housing can be dried with a hot blower. (3) Use a multimeter to measure the resistance between X and y. If the resistance exceeds 200 days, the field coil and its leads may be open or have poor contact. Remove the terminal board for inspection. (4) Check the insulation resistance between X, Y and C, it should be greater than 200 ohms. If it falls, dry the inside of the case with hot air. In practice, the reduction in coil insulation can lead to increased measurement errors and unstable instrument output signals. (5) If it is determined that the sensor is faulty, please contact the electromagnetic flowmeter manufacturer. In general, it cannot be fixed in the field, so it needs to be repaired by the manufacturer. 3. Converter inspection If it is judged that the converter is faulty, if there is no problem with external reasons after inspection, please contact the manufacturer of the electromagnetic flowmeter. The manufacturer usually replaces the circuit board to solve the problem. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Regular inspection and test items for electromagnetic flowmeters'
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