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Hi, it’s still the industrial control expert from Aixue* today. The little piece of knowledge we’re sharing in this episode is about dealing with common problems associated with electromagnetic flowmeters. Why isn’t the electromagnetic flowmeter that was just purchased working? Why does the reading of the electromagnetic flowmeter keep fluctuating? Let’s take a look together! First, when the electromagnetic flowmeter is not functioning, review the flowmeter’s manual and operating procedures once again. In many cases, a major reason for the flowmeter’s failure to operate is that the manual has not been read thoroughly. You might as well take a look to see if there are any things you missed during your previous readings. Secondly, if the above reasons are ruled out, you can consider the following factors: 1) The pipe is not fully filled with liquid or there is foam in the liquid. This situation may cause the electromagnetic flowmeter to mistakenly believe that no liquid is flowing in the pipeline, thus incorrectly identifying it as in a non-operational state. 2) Factors such as liquids containing solid particles, electrodes being contaminated by oil deposits, and dirt on the inner walls of the flowmeter pipes can also affect electromagnetic flowmeters. 3) Is there a possibility of current leakage near the installation location of the electromagnetic flowmeter? Leakage or unstable current can also affect the proper operation of electromagnetic flowmeters to a certain extent. 4) Problems with circuit connections, as well as factors such as short circuits, can also cause instability in electromagnetic flowmeters. When the electromagnetic flowmeter shows fluctuations, the cause is not merely unstable instantaneous flow rates. During calibration, since the environmental conditions are favorable and the flowmeter operates properly, it is easy to overlook the installation conditions at that time. In such cases, once the environmental conditions change and new interference sources arise during operation, they will disrupt the normal functioning of the instrument, causing fluctuations in the output signal of the flow meter. The above are only some of the reasons for unstable readings on electromagnetic flowmeters; other possible causes include: 1. Incorrect installation location, insufficient filling of the pipe, gas remaining in the piping system, or absorption of bubbles. 2. The regular pulsating flow generated in the piping system by reciprocating pumps and similar devices. 3. The liquid contains gas or bubbles. 4. There are strong magnetic fields such as those from motors in the vicinity, and stray currents exist on the pipes. 5. The electrodes of the electromagnetic flowmeter are contaminated. 6. Poor grounding. That’s all for the little tips in this issue. Isn’t it simple and useful? The little assistant will continue to guide you through various tips related to industrial control; be sure to follow me.