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How do we maintain the electromagnetic flowmeter when it is not in use
2012-3-22 9:13:54


How to maintain the electromagnetic flowmeter in the shutdown state

在停机即不使用的时候,我们要对电磁流量计采取科学合理的维护和保养方法。 When the electromagnetic flowmeter is not used when it is stopped, we must adopt scientific and reasonable maintenance and maintenance methods for the electromagnetic flowmeter. In providing electromagnetic flowmeter technical services to users, users often encounter inaccurate measurement data after purchasing the electromagnetic flowmeter for a period of use. In fact, this is not a quality problem of the electromagnetic flow meter itself. Because the user does not follow the post-use care and maintenance methods in the manual.

I. Zero check and adjustment of electromagnetic flowmeter maintenance:

投入运行前,通电后必须在电磁流量传感器充满液体静止状态下调整零点。 Before the electromagnetic flowmeter is put into operation, the zero point must be adjusted after the electromagnetic flow sensor is full of liquid after the power is turned on. After being put into operation, it is necessary to periodically check the zero point according to the conditions of use. Especially for precipitates and easily polluted electrodes, non-cleaning liquids containing solid phases should be checked at the beginning of operation to obtain experience to determine the normal inspection cycle. The AC magnetic field flowmeter and rectangular wave excitation ratio are more likely to produce zero drift, so more attention should be paid to inspection and adjustment. Take two examples of application errors where the deposits have failed. One is that in the oil drilling and cementing project, the total flow of cement slurry is an important process parameter, and high pressure electromagnetic flow meters are often used. Use the meter intermittently. Rinse the sensor measuring tube with clean water after use. The remaining time is empty. Due to incomplete cleaning, the residual cement slurry on the inner wall of the measuring tube has solidified into a thin layer, which has accumulated in the past two months to form an insulating layer, covering the entire electrode surface, resulting in abnormal operation and eventually failure to work. The other is an electrolytic cutting process inspection device, which uses an electromagnetic flowmeter to control the flow of saturated saline solution. After a period of use, the flow signal is gradually weakened, and the signal is zero after 2 months. The reason is that iron oxide deposits on the tube wall during electrolytic cutting, resulting in a short circuit. Clearing the stratum immediately returned to normal.

维护之定期检查传感器电性能: Second, the periodic inspection of the electrical performance of the electromagnetic flowmeter maintenance sensor:

First, roughly measure the resistance between electrodes. Disconnect the signal connection between the sensor and the converter, the sensor is filled with liquid, and use a multimeter to measure the resistance value of the two electrodes and the ground terminal, whether it is within the range specified by the manufacturer, and the measured two values are substantially the same. Record the resistance value measured for the first time. This value is useful for later determining the cause of the sensor failure (such as whether the deposited layer is conductive or insulating). Secondly, drain the sensor from the liquid and wipe the inner wall. After it is completely dry, use a megohmmeter to measure the resistance between the two electrodes and the ground terminal. Finally, check the insulation resistance of the exciting coil, remove the sensor exciting coil, wire the terminal indirectly to the converter, and measure the insulation resistance of the coil with a megohmmeter.