When dealing with liquids that have a tendency to crystallize, electromagnetic flowmeters require careful consideration. Some chemical solutions may behave normally under standard temperature conditions. However, even with good thermal insulation on the piping, the measuring tube of an electromagnetic flow sensor often struggles with heat tracing. As a result, when the fluid passes through the measuring tube, it can lead to the formation of a solid layer on the inner walls due to temperature drop.
Crystallization is not unique to electromagnetic flowmeters; other types of flow measurement devices also face similar issues. In the absence of more effective alternatives, a short-length "ring" electromagnetic flow sensor could be a suitable option. This design allows for easier maintenance and cleaning. Additionally, insulating the upstream pipeline can help prevent crystallization, making the system more reliable in the long run.
It's quite common to encounter electromagnetic flowmeters that fail due to crystallization. For instance, a smelting plant in Hunan installed several electromagnetic flowmeters to monitor the flow of a solution. However, because the measuring tube couldn't be properly insulated, crystals began to form on the inner wall and electrodes after a few weeks. This led to a significant increase in internal resistance, causing the instrument to display incorrect readings.
Given the large size of these flowmeters, frequent cleaning and disassembly became impractical. As a result, the plant eventually switched to using an open channel flowmeter instead. This example highlights the importance of selecting the right type of flowmeter based on the properties of the fluid being measured.
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