Electromagnetic flowmeter installation specification

Electromagnetic flowmeters are a lot of instruments that are often involved in the automation industry. In today’s issue, we won’t talk about how to install it. We will use the wrong case to learn from you. For on-site primary instruments, accurate selection is very important, but more importantly............................... .　　Installation!　　installation!　　installation!　　The wrong installation method of electromagnetic flowmeter shared with you today is only more funny, not the most funny! 　　Please be prepared mentally. Beating all the time, 　　 is the same as chewing Xuanmai...I can't stop at all.　　Case analysis: 　　There is a pump on site, and the pump is next to the flowmeter. When the fluid passes through the flow meter. The fluid is in a turbulent state (that is, the water is swirling). At this time, there is a large interference to the flowmeter measurement, so the field flowmeter value often fluctuates and cannot be stabilized at all.　　 Funny index: ☆☆☆　　Solution: 　　 install a straight pipe section away from the pump at least 5 times the diameter to ensure fluid stability.　　There are similar cases installed near the valve　　Case 2: The flow rate is always inaccurate 　　 A customer site, the flow measurement is always inaccurate, and sometimes there will be empty pipe alarms and lower limit alarms.　　Case analysis: 　　As you can see from the picture above, only half of our pipeline has no water, so that means that the electromagnetic flowmeter is not full at all. The flowmeter is not full, how can it be measured accurately? 　　 Funny index: ☆☆☆☆　　Solution: 　　The outlet of the flowmeter can be reduced in diameter, and a section of pipe extension can be installed to fill the entire pipe with liquid. Case 3: The electromagnetic flowmeter is often damaged. Wow, the flowmeter, can't we see it? 　　 We pumped the water and looked at it. It turned out that the electromagnetic flowmeter baby who has been flooded for a long time here in the well, the general electromagnetic flowmeter is IP65 protection Grade, rainproof is OK, soaking in water is GG Smecta. And this installation...　　The flowmeter comes out as a big pool! 　　Funny index: ☆☆☆☆☆　　Case analysis: 　　In occasions where there may be a long-term risk of water immersion, you must choose IP68 protection level, which can support water immersion. The electromagnetic flowmeter, otherwise the water immersion damages, the loss will be large.　　 Our business friends, when selling products to customers, be sure to communicate with customers more about installation matters, otherwise they will leave these funny pits.　　Solution: 　　It is recommended to use IP65 protection level. If the pipes on site do not support diameter reduction, the sewage can be collected, and then re-lay the pipes, and install the flowmeter after pumping it out. Or change to ultrasonic open channel flowmeter.　　Of course, there are more weird installation methods, causing the flowmeter to go further and further on the road to accurate measurement. Why is electromagnetic flowmeter measurement so strict for installation requirements? 　　一. The measurement principle of electromagnetic flowmeter is mainly based on the Faraday electromagnetic induction principle. The conductive medium cuts the magnetic induction line to generate induced electromotive force, and the signal is collected by two measuring electrodes installed on the central axis of the pipeline. .　　 In this way, everyone should be able to have some analysis of the first case. The measured water may not flow over the measuring electrode, and no signal can be sensed at all. The flowmeter naturally displays a lower limit alarm or even an empty pipe alarm. So everyone read to me: The electromagnetic flowmeter measures the water to have a full tube! To be full! To be full! 　　 The important thing is to say three times in which case the water can guarantee a full pipe? 　　 Vertical pipeline, water from bottom to top, sure It is full of pipes, of course, there are also installation methods for horizontal pipes. As long as the flow of such pipes is within the selected range, the flow must be accurate and stable.　　 2. The flow rate of the fluid passing through the flow meter in the pipeline must be uniform and stable. Why? When we measure flow, we actually measure the product of flow velocity and pipe cross-sectional area. The flow rate is unstable, and the flow rate will naturally jump.　　Analyzing the second case, the flowmeter is near the pump. First, eliminate the interference of the high-power instrument on the product signal. The flow rate must be unstable, so our conventional choice is to install the flowmeter as far as possible. Of course, the most important thing is a long enough straight pipe section!!! What is the role of the straight pipe section? Think about the Yangtze River and the Yellow River. The more straight the lower reaches, the smoother the water. Thinking about the Hukou Waterfall.............　　 So the function of the straight pipe section is to smooth the flow rate of the fluid so that it can pass through the flow meter evenly and stably. Then continue to read to me, straight up the paragraph, the first ten after five, the first ten after five. (It means that there should be 10 times the straight pipe section in the upstream direction of the flow meter, and 5 times the straight pipe section in the downstream direction) 　　 Finally, I will share with you some correct installation tips. Worry-saving, labor-saving and efficient flowmeter sharing, we will continue next time~
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