Stability of On-Line Periodic Inspection of Electromagnetic Flow Meters

Abstract: The stability information of the online periodic inspection of the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. To check the stability of the electromagnetic flowmeter, we must operate in a controlled state, so it must be checked regularly. The medium and small diameter flow instruments in the process industry are generally equipped with bypass pipes and corresponding stop valves, and once the instrument is commissioned and put into operation, it is generally normal. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the stability of the online periodic inspection of electromagnetic flowmeters. To check the stability of the electromagnetic flowmeter, we must operate in a controlled state, so it must be checked regularly. The medium and small diameter flow meters in the process industry are generally equipped with bypass pipes and corresponding stop valves, and once the meters are commissioned and put into operation, it is generally not allowed to stop water delivery, so it is unlikely to remove the flow sensor and send it to the laboratory offline. Verified on flow standard device. In order to make the measurement of the electromagnetic flowmeter correct and reliable within a period of time without affecting the water delivery of the pipe network, the water supply industry often adopts the method of online inspection and verification instead of regular offline periodic verification. 1. Check the electrode insulation resistance and lining condition. To check the electrode insulation resistance, lining integrity or adhesion layer condition, for small bore meters only remove from the pipeline for inspection. For large-diameter instruments, the measuring medium should be emptied and observed from the manhole into the pipeline. Dry the electrode and the inner surface of the liner without leaving any liquid stains. Use a 500V DC megger to measure the insulation resistance of the two electrodes to ground respectively. If the lining adhesion layer must be removed, determine the future cleaning interval according to the thickness of the laminate. A large part of the decrease in electrode insulation is caused by the external moisture or water immersion of the sensor, and sometimes it can be recovered by removing the moisture with a hot air blower. If the insulation is indeed damaged, such as electrode leakage, you can only replace the sensor and return it to the manufacturer for repair. 2. Check the insulation resistance of the excitation coil. After the excitation coil and its terminals are damp, the insulation of the excitation circuit to the ground will decrease, which will introduce common mode interference signals, make the zero point of the converter drift, and affect the measurement accuracy. In practice, due to negligence, the junction box is not well sealed, such as installing a sealing gasket at the lead-in end of the cable, introducing moisture, and reducing the insulation of the terminal is a frequent failure case. Dry the terminal with a hot hair dryer, usually the insulation can be improved or restored to the factory insulation level, and the fault can be eliminated. 3. Measure the copper resistance of the excitation coil. Measure the coil resistance with a high-precision digital multimeter or a Wheatstone bridge, and correct the temperature coefficient if necessary. Compare the measured value with the instrument file value to confirm that the coil is well connected and there is no short circuit between turns. In fact, the probability of short circuit between turns of the coil is very low. This check, together with the converter excitation current check, indirectly evaluates whether the magnetic field strength of the flow sensor has changed. 4. Check the insulation of the signal circuit and the insulation between the excitation circuit/signal. The purpose of this inspection is also to evaluate the interference introduced by the insulation degradation. When checking the signal circuit, the signal wire should be temporarily disconnected from the electrode. Insulation degradation can occur for many reasons, with unsealed junction boxes entering moisture being a common cause. 5. Check the electrode contact resistance. Measuring the contact resistance between the electrode and the liquid can indirectly evaluate the general condition of the electrode and the backing layer, such as whether the electrode surface and the backing layer are attached to the deposition layer, and whether the deposition layer is conductive or insulating. The electrode contact resistance of the flow sensor should be measured immediately after the newly installed instrument is debugged and recorded. After each measurement is performed during maintenance, analyzing and comparing these data will help to identify the cause of the instrument failure. The contact resistance between the electrode and the measured medium depends on the size of the contact surface (ie the size of the electrode end face) and the conductivity of the measured medium. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Stability of Online Periodic Inspection of Electromagnetic Flow Meters'
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