How to maintain the electromagnetic flowmeter when it is shut down?

Case introduction

Electromagnetic flowmeters are particularly important for the daily maintenance and upkeep of instruments. Regarding the maintenance of flowmeter instrument equipment, special attention should be paid to methods.

Flowmeter maintenance and maintenance methods

When the intelligent electromagnetic flowmeter is shut down and not in use, we must adopt reasonable maintenance and maintenance methods for the flowmeter. When the flow meter is put into use, there will be a period of time when the measurement data is inaccurate. In fact, the problem is not caused by the quality of the flow meter. It is often caused by failure to maintain it according to the instructions in the manual.

Flow meter detection

1. Zero point detection and adjustment of flow meter maintenance. Before the flow meter is put into operation, the zero point must be adjusted when the electromagnetic flow sensor is filled with liquid and is in a stationary state after powering on. After being put into operation, it is also necessary to periodically stop the flow and conduct zero-point inspections according to the operating conditions; especially for non-cleaning fluids that are prone to contamination of electrodes due to sedimentation and contain solid phases, more inspections should be made in the early stages of operation to gain experience and determine the normal inspection cycle. The flowmeter with AC excitation method is more likely to produce zero point drift than the rectangular wave shock ratio, so more attention should be paid to detection and adjustment. 2. Flowmeter maintenance: Regularly check the electrical performance of the sensor. How to maintain the flowmeter when it is shut down? First, roughly measure the resistance between the electrodes. Disconnect the signal connection between the sensor and the converter. The sensor is filled with liquid. Use a multimeter to measure the resistance value of the two electrodes and the ground terminal to see if it is within the value range specified by the manufacturer, and the two measured values ​​are roughly the same. Record the measured resistance value. This value will be useful for later determining the cause of sensor failure (such as whether the deposited layer is conductive or insulating). Secondly, drain the liquid out of the sensor, wipe the inner wall, and after it is dry, use a megohmmeter to measure the resistance between the two electrodes and the ground terminal.

A summary of how to maintain the electromagnetic flowmeter when it is shut down

The shutdown maintenance of the electromagnetic flowmeter is to ensure or prove that the flowmeter is operating in a controlled state. There are generally two methods of inspection: online inspection and offline inspection. The main purpose is to verify whether the flow measurement value of the flow meter meets and maintains the expected measurement requirements. Remove the flow sensor from the pipeline, clean and inspect it, and then perform flow calibration. In order to reduce the damage to the lining when the flow sensor is removed from the pipeline, first measure the insulation resistance on the pipeline to infer whether there are any abnormalities, and then decide whether to remove the pipeline for inspection or real-flow flow calibration in the next step.