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1. The electromagnetic flowmeter sensor is not installed according to the flow direction identifier, resulting in reverse flow measurement. At this time, the instantaneous flow rate is negative.
Solution: Reinstall the electromagnetic flowmeter and label it according to the flow direction of the sensor.
2. The signal line of the flow sensor is reversed. The electromagnetic flowmeter has the function of forward and reverse measurement, so the reverse flow will be displayed.
Solution: The sensor signal line can be exchanged correctly.
3. The empty pipe or liquid of the measuring pipe is not full of pipes, and gas and air bubbles exist. At this time, negative or flow values ​​will show up and down.
Solution: It is possible to adopt a shrunk or inclined installation so that the pipeline is filled with the measured medium and the flowmeter can be provided with measurement conditions.
Research by Ou Wei instrument, there is a case of negative flow of electromagnetic flowmeter. When the valve is opened, the instantaneous flow will cause the liquid in the pipeline to flow back, resulting in a negative value.
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Electromagnetic flowmeter shows negative causes and solutions
The malfunction of the electromagnetic flowmeter in operation is often caused by factors such as the adhesion layer of the inner wall of the flow sensor, lightning shock, and changes in environmental conditions. If there is a negative flow rate in the use of electromagnetic flowmeters, there are several possible reasons for the following analysis: