Electromagnetic flow meters have many advantages, such as stable measurement signals, high measurement accuracy, and reliable data; However, improper selection, installation, or use can also lead to measurement errors and even damage to the instrument.

　　The liquid inside the tube is not full. When there is a small amount of gas inside the tube, it will cause the measurement results to deviate from the actual value, resulting in small errors; When there is a lot of gas present, the measured value will be unstable and the output will shake, and the measured value cannot be considered as the correct result. The tested liquid contains solid components. It can lead to contamination of the electrode surface, covering the electrode or lining, resulting in a decrease in the cross-sectional area of flow and a gradual decrease in the flow rate value. If there is conductive material in the sedimentary layer, the flow signal is likely to be short circuited, causing the instrument to fail. Improper selection of electrodes or grounding rings. When the electrode comes into contact with the measured fluid medium, the electrochemical reaction of the measured medium will generate a polarization voltage.

　　The reliable detection of flow signals by electrodes is crucial to the performance of flow meters. The grounding ring serves as an electrical connection with the medium and is connected to zero potential through a grounding wire. When the process pipeline connected to the sensor is made of plastic or coated with insulation, a grounding ring must be installed to prevent the instrument from working properly. There are many types of materials for electrodes and grounding rings, and attention should be paid when choosing.

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