Case analysis of electromagnetic flowmeter error causes (3) - Database & Sql Blog Articles

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When dealing with liquids that have a tendency to crystallize, electromagnetic flowmeters require careful handling. While some chemical substances can be measured accurately under normal temperature conditions, the risk of crystallization increases when the fluid passes through the measuring tube of the flow sensor. Unlike the piping system, which often has good thermal insulation, the measuring tube itself is difficult to insulate effectively. As a result, when the fluid cools down inside the tube, it may form a solid layer on the inner walls, leading to measurement inaccuracies.

This issue isn't unique to electromagnetic flowmeters. Other types of flow meters also face similar challenges with crystallization. In such cases, a compact "ring" type electromagnetic flowmeter with a short measuring tube can be an effective solution. This design allows for easier maintenance and cleaning. Additionally, by ensuring proper heat insulation in the upstream pipeline, the risk of crystal formation can be significantly reduced.

It’s important to choose a flow meter that allows for easy disassembly and maintenance. If crystallization occurs, the ability to quickly remove and clean the sensor is crucial. In many industrial settings, this feature can save time and reduce operational downtime.

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3. It's not uncommon to encounter electromagnetic flowmeters that fail due to liquid crystallization. For instance, a smelting plant in Hunan installed several electromagnetic flowmeters to measure the flow of a solution. However, because the measuring tube couldn’t be effectively 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. Due to the large size of the flowmeters, frequent cleaning and removal became impractical, ultimately forcing the company to switch to open-channel flowmeters.

Shanghai Beverly Automation Technology Co., Ltd.