Liquids that may crystallize, electromagnetic flowmeters should be used with caution. Some easily crystallized chemical materials can be measured normally under normal temperature conditions. Because the conduits for transporting fluids have good heat insulation, they will not crystallize during thermal insulation, but electromagnetic The measuring tube of the flow sensor is difficult to perform heat tracing. Therefore, when the fluid flows through the measuring tube, it is easy to cause a solid layer on the inner wall due to the temperature drop. Since the flow meter measurement using other principles also has crystallization problems, in the absence of other better methods, a "ring" electromagnetic flow sensor with a very short measuring tube length can be selected, and the upstream pipeline of the flow meter can be used. Heat insulation is used to strengthen it. In the pipe connection method, it is convenient to disassemble and disassemble the flow sensor, and it is convenient to remove the maintenance once it is crystallized.
Instance
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It is not uncommon to see an electromagnetic flowmeter that does not work properly due to liquid crystallization. For example, a smelter in Hunan installed a batch of electromagnetic flowmeters to measure the flow rate of the solution. Because the measuring tube of the electromagnetic flow sensor is difficult to carry out heat insulation, a layer of crystals is formed on the inner wall and the electrode after a few weeks, causing the internal resistance of the signal source to become Very large, the instrument indicates that the value is abnormal. Because of the large diameter of these electromagnetic flowmeters, frequent washing and unloading is unbearable, so the end is still to use the open channel flowmeter.
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