Analysis of the reasons for negative readings on electromagnetic flowmeters

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If the flow rate displayed by the electromagnetic flowmeter is negative during installation or operation, there may be several possible reasons: 1. The sensor was not installed in accordance with the direction indicators, resulting in the measurement being taken in the opposite direction. Solution: Reinstall. An electromagnetic flowmeter usually has an arrow on it, indicating the direction of flow of the medium. 　　2. The sensor signal wires are connected in reverse; since the electromagnetic flowmeter has the capability to measure flow in both directions, it displays the reverse flow rate. Solution: Swap the signal wires. 3. The pipeline is empty or not fully filled, with gas present. At this point, the flow meter will display a negative value or the flow rate will fluctuate greatly. Treatment method: Fill the pipeline with the medium to be measured to enable the flow meter to function for measurement.