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Analysis of the problem of electromagnetic flowmeter in operation

The analysis of the problem can be divided into several aspects, as is the electromagnetic flowmeter. The analysis of the problems caused by the operation of the electromagnetic flowmeter can be divided into: the problem of commissioning period, the problem of operation period, the piping system and the device, etc. , caused by the flow of water, and so on.

Common debugging problems are mainly caused by improper installation, environmental interference, and fluid characteristics:

Environmental aspects

Mainly due to pipeline stray current interference, space electromagnetic wave interference, large motor magnetic field interference. Pipe stray current interference usually adopts good separate grounding maintenance to obtain the centroid measurement. However, if there is strong stray current in the pipeline (such as the electrolysis workshop pipeline), it may not be restrained, and the flow sensor and the pipeline must be taken. Space electromagnetic wave interference - usually introduced by signal cable, usually maintained by single or multi-layer shielding, but it has also been prevented from being shielded and maintained.

Piping systems and installations

Usually it is caused by incorrect position of the electromagnetic flow sensor device. For example, the flow sensor is installed at the high point of the pipe network which is easy to accumulate the retained gas; after the flow sensor, there is no back pressure, and the liquid is discharged into the atmosphere, forming the inner tube of the measuring tube. Full pipe; installed on vertical pipes flowing from top to bottom, may appear empty.

Fluid aspect

The liquid contains finely dispersed fine bubbles usually does not affect the normal measurement, but the measured volume flow is the sum of the liquid and the gas; the increase of the bubble will shake the output signal, if the bubble is large enough to flow through the electrode to cover the entire surface of the electrode, so that the electrode signal When the loop is momentarily disconnected, the output signal will produce more shaking.

Inner wall adhesion layer

Since the electromagnetic flowmeter measures the time of containing the suspended solid phase or the dirty body much more than other flow meters, the probability of occurrence of the inner wall adhesion layer is relatively high. Therefore, the application unit must recognize the importance of setting up the lightning protection equipment for the power supply line of the control room. There are already a number of design units that have teamed up and explored this issue.

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