Electromagnetic flowmeter instantaneous flow rate display zero

Case introduction

1. The medium is not conductive: The measurement principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, which requires that the measured medium must be conductive. . If the medium is not conductive, such as petroleum oil products or organic solvents, the electromagnetic flowmeter will not work properly.

2. The flow in the pipeline is not full: full pipe measurement is conducive to the stability of the flow. If the flow in the pipeline is insufficient, it may cause the water surface to be unstable or water bubbles to appear, thus affecting the accuracy of the electromagnetic flowmeter. Measurement.

3. There is no flow in the electromagnetic flowmeter pipe: If there is indeed no flowing medium in the pipe, the electromagnetic flowmeter will naturally be unable to detect the instantaneous flow.

4. The electrode is covered and does not come into contact with the liquid: After long-term use, the electrode surface of the electromagnetic flowmeter may be covered with non-conductive dirt, causing the electrode to be unable to contact the liquid normally, thus affecting the measurement.

5. The flow rate is less than the flow cutoff lower limit set in the meter head: If the actual flow rate is lower than the flow cutoff lower limit set in the electromagnetic flowmeter meter head, the instantaneous flow rate may be displayed as zero.

6. Incorrect parameter settings in the meter header: Wrong parameter settings will also cause the electromagnetic flowmeter to be unable to correctly detect and display instantaneous flow.

7. Sensor damage: If the sensor of the electromagnetic flowmeter is damaged, it will also cause the instantaneous flow rate to be unable to be detected.

Measures to avoid problems include:

Ensure that the measured medium is conductive and meets the measurement requirements of the electromagnetic flowmeter.

Ensure that the flow in the pipeline is full to avoid unstable flow or the presence of bubbles that may affect the measurement.

Regularly inspect and maintain the electrodes of the electromagnetic flowmeter to prevent them from being covered by dirt.

Correctly set the parameters of the electromagnetic flowmeter, including the lower limit of flow cutoff, etc.

Regularly inspect and replace damaged sensors to ensure they are working properly.

Through the above measures, the problem of the electromagnetic flowmeter showing that the instantaneous flow rate is always zero can be effectively avoided.