Factors to consider when selecting an electromagnetic flowmeter

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Factors to consider when selecting an electromagnetic flowmeter [Copy link]

1. Conductivity The medium measured by the electromagnetic flowmeter needs to meet the conductivity requirements. The liquid conductivity needs to be greater than 5μs/cm. 2. Accuracy level The electromagnetic flowmeter has high accuracy because the liquid flowmeter has a large measurement range. The larger the measurement range, the smaller the accuracy must be. The larger the range, the greater the error, so the accuracy needs to be strictly controlled. The accuracy of the precision flowmeter is 0.5-1, while the accuracy of the conventional glass and gold transfer is 2.5. The difference is still a bit big. In terms of metering and billing, it is still necessary to choose a high-precision electromagnetic flowmeter. 3. Selection of flow rate and caliber The flow rate requirement of the electromagnetic flowmeter is between 0.5-15m/s, and the reasonable flow rate is generally between 1.5-3m/s. If the flow rate is too fast, if it contains particulate matter, it may scratch the lining of polytetrafluoroethylene. The flow rate and caliber need to be reasonably selected. 4. Problems in the selection of grounding rings and electrode materials. Defects are caused by the mismatch between the measured liquid and the electrode or grounding ring. In addition to corrosion problems, this mismatch also causes surface effects of the electrode, mainly including: chemical reactions, polarization phenomena, and catalytic effects. Grounding rings also have these problems, but the impact is smaller. 5. If the liquid contains particles, the following defects may occur: deposition layers on the surface of the electrode and the material, wear of the material, and reduction in the cross-sectional area of the pipe. Some liquids that are more prone to crystallization will cause a layer of solids to hang on the inner wall when the fluid flows through the flowmeter. Because the same problem also exists when using other types of flowmeters, a flowmeter with a very short measured pipeline and easy disassembly can be selected, which can be easily disassembled after crystallization to stop maintenance.

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If the liquid contains particles, the following defects may occur: accumulation of deposits on the surface of the electrode and the fabric, wear of the fabric, and reduction of the cross-sectional area of the pipe. Some liquids that are easy to crystallize will cause a layer of solids to hang on the inner wall when the fluid flows through the flowmeter. Since the same problem also exists when using other types of flowmeters, a flowmeter with a very short measured pipeline and easy disassembly can be selected, which can be easily disassembled for maintenance after crystallization.