Maintenance method of electromagnetic flow meter in shutdown state1

Abstract: The maintenance method information of electromagnetic flowmeter meter in shutdown state is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. When the electromagnetic flowmeter is not in use, we must take scientific and reasonable maintenance and maintenance methods for the electromagnetic flowmeter. Many people find that after purchasing the electromagnetic flowmeter and using it for a period of time, it is found that the measurement data is inaccurate when it is used again. Actually this. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the details of the maintenance method of the electromagnetic flowmeter meter in the shutdown state. When the electromagnetic flowmeter is not in use, we must take scientific and reasonable maintenance and maintenance methods for the electromagnetic flowmeter. Many people find that after purchasing the electromagnetic flowmeter and using it for a period of time, it is found that the measurement data is inaccurate when it is used again. In fact, this is not the quality problem of the electromagnetic flowmeter itself. It is because the user does not maintain and maintain it according to the method in the manual. 1. Zero point inspection and adjustment of electromagnetic flowmeter maintenance Before the electromagnetic flowmeter is put into operation, the zero point must be adjusted when the electromagnetic flow sensor is full of liquid and static after power-on. After being put into operation, it is also necessary to periodically stop the flow for zero-point inspection according to the conditions of use; especially for precipitation, easily polluted electrodes, and non-cleaning liquids containing solid phase, more inspections should be carried out in the early stage of operation to obtain experience to determine the normal inspection cycle. Compared with the rectangular wave shock, the electromagnetic flowmeter of the AC excitation method is more prone to zero drift, so more attention should be paid to inspection and adjustment. Give two examples of application errors where the deposited layers fail. One is that in oil drilling and cementing engineering, the total flow of cement slurry is an important process parameter, and high-pressure electromagnetic flowmeters are often used. The instrument is used intermittently. After use, rinse the sensor measuring tube with clean water, and the remaining time is empty. Due to the incomplete cleaning, the residual cement slurry on the inner wall of the measuring tube solidified into a thin layer, which accumulated to form an insulating layer in the past two months, covering the entire electrode surface, resulting in abnormal operation and eventually unable to work. The other is the electrolytic cutting process test device. The electromagnetic flowmeter is used to control the flow of saturated brine. After a period of intermittent use, it is found that the flow signal gradually weakens, and the signal is zero after 2 months. The reason is that iron oxide deposits on the tube wall during the electrolytic cutting process, resulting in a short circuit. Clear the stratification and return to normal immediately. 2. Regularly check the electrical performance of the sensor for the maintenance of the electromagnetic flowmeter First, roughly measure the resistance between the electrodes. Disconnect the signal connection between the sensor and the converter, fill the sensor with liquid, measure the resistance between the two electrodes and the ground terminal with a multimeter, whether it is within the range specified by the manufacturer, and the two measured values ​​are roughly the same. Record the resistance value of the first measurement, which is useful for later determining the cause of the sensor failure (such as whether the deposited layer is conductive or insulating). Next, empty the sensor of the liquid, wipe the inner wall, and measure the resistance between the two electrodes and the ground terminal with a megohmmeter after it is completely dry. Finally, check the insulation resistance of the excitation coil, remove the sensor excitation coil, wire the terminal to the converter, and measure the insulation resistance of the coil with a megohmmeter. This article is provided by Testo Instruments, please indicate the source for reprinting! ! The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Maintenance method of electromagnetic flow meter in shutdown state'

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