Analysis of electromagnetic flowmeter common faults and processing there are two major factors:
Electromagnetic flowmeter fault treatment mainly has two major factors: 1. Fault during debugging 2. Failure during operation. In terms of sub-installation for debugging faults, the three aspects of the environment, the fluids, and the operation-time faults were divided into three categories: dirty, thunder strike, and environmental conditions.
It is usually a fault caused by incorrect installation position of the electromagnetic flow sensor. Commonly, such as installing the sensor at the highest point of the pipe system for accumulating gas; or installing it on a vertical pipe from top to bottom, the emptying may occur; or after the sensor Back pressure, the fluid is directly discharged into the atmosphere to form a non-full tube in the measuring tube.
It is usually caused by stray currents in the pipeline, strong electromagnetic interference in the space, and magnetic interference in large electrical machines. Pipeline stray current interference usually achieves satisfactory results with good individual ground protection, but in the case of strong stray currents (such as the electrolytic shop pipe, sometimes the peak potential of the AC potential induced at the two electrodes can be as high as 1V), Additional measures must be taken to insulate the flow sensor from the pipeline. Space electromagnetic interference is generally introduced via signal cables and is usually protected by single or multiple layers of shielding.
The even distribution of microbubbles in the liquid to be measured usually does not affect the normal operation of the electromagnetic flowmeter , but as the air bubbles increase, the output signal of the instrument will fluctuate. If the air bubbles are large enough to cover the entire surface of the electrode, the flow of air bubbles Passing the electrode will momentarily disconnect the electrode loop and cause the output signal to fluctuate more.
The adhesive layer on the inner wall of the sensor measures the dirty fluid commonly used by electromagnetic flowmeters. After running for a period of time, it often accumulates an adhesive layer on the inner wall of the sensor and causes a failure.
Lightning strikes easily induces high voltage and inrush currents in the instrument line, causing damage to the meter. It is mainly introduced through the power line or the excitation coil or the flow signal line between the sensor and the converter, and is particularly introduced from the power cable of the control room.
During commissioning, the meter is working properly due to good environmental conditions (eg, no interference source), and it is often easy to neglect installation conditions (eg, grounding is not good). In this case, once the environmental conditions change, new sources of interference occur during operation (such as welding on pipelines near the flowmeter, large transformers installed nearby, etc.), which will interfere with the normal operation of the meter, and the output of the flowmeter. The signal will fluctuate.
The above are common problems in the electromagnetic flowmeter fault handling. It is hoped that the user can deal with the above-mentioned information as quickly as possible and maintain the working state of the electromagnetic flowmeter.
Extended reading: Ming Yu automatic electromagnetic flowmeter
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