Analysis of common faults in the use of electromagnetic flowmeters
Jinhu Kate Instrument Co., Ltd. specializes in producing electromagnetic flowmeters and flowmeters. Our technical staff has summarized the reasons why electromagnetic flowmeters will applause during the ongoing research and customer communication, mainly because of the attachment of the inner wall of the flow sensor. Layers, lightning strikes, changes in environmental conditions and other factors, the following description of the reference to provide our customers. 1 : sensor inner wall adhesion layer 2 : Lightning Strike 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. 3 : Changes in environmental conditions 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, and large transformers are installed nearby), which will interfere with the normal operation of the meter, and the output of the flowmeter. The signal will fluctuate to sum up:
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Since electromagnetic flowmeters are commonly used to measure dirty fluids, after a certain period of operation, an adhesion layer accumulates on the inner wall of the sensor and often causes failure. These failures are often caused by too much or too little conductivity of the adhesion layer. If the attachment is an insulating layer, the electrode circuit will be open circuit, the meter can not work properly; if the adhesion layer conductivity is significantly higher than the fluid conductivity, the electrode circuit will appear short circuit, the instrument can not work properly. Therefore, the adhered scale layer in the measuring tube of the electromagnetic flowmeter should be promptly removed.
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