The harm of liquid crystal to the electromagnetic flow meter

The electromagnetic flow meter should be used carefully to measure the liquid medium of crystallization, as the pipeline conveying fluid has a good thermal insulation, in the heat preservation work will not crystallization, but the electromagnetic flow sensor measurement tube difficult to implement with thermal insulation, therefore, the flow through the measurement tube is easy because of cooling caused by the inner wall knot a layer of solid. Due to the use of other principles of flow meter measurement also has a crystallization problem, so in the absence of other better methods, the measurement tube length is very short of a "ring" (oring) electromagnetic flow sensor, and the flow meter upstream pipeline with thermal insulation to strengthen. In the pipeline connection method, consider the flow sensor disassembly and disassembling conveniently, once the crystallization can easily remove the maintenance. It is not uncommon to have an electromagnetic flow meter that is not working properly due to liquid crystallization. For example, a smelter in Shandong to install a batch of electromagnetic flow meter to measure solution flow, due to the electromagnetic flow sensor measurement tube difficult to implement with thermal insulation, a few weeks after the wall and the electrode on a layer of crystallization, resulting in the signal source internal resistance becomes very large, the instrument represents an abnormal value. Because of the large size of the electromagnetic flow meter, frequent wash and wash unbearable, so the final switch to open channel flow meter.

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