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1. How to troubleshoot when encountering a situation where the electromagnetic flowmeter has a full range of 21.5?
When the electromagnetic flowmeter displays a full range of 21.5, it is necessary to first confirm whether the value is instantaneous flow or cumulative flow, and then gradually troubleshoot in the order of signal circuit, medium working condition, equipment body, and system configuration.
1. Verify the range configuration and display type.
Confirm whether the 21.5 displayed on the instrument is the instantaneous flow value or the cumulative flow value. Accumulated flow overflow at full range is mostly a numerical cycle reset, while instantaneous flow overflow at full range is an abnormal over limit display2. Check the range setting parameters of the flowmeter to confirm whether the current set measurement upper limit matches the actual working conditions. If the actual instantaneous flow exceeds the set upper limit, the instrument will trigger a full range protection display
3. Refer to the fault code manual that comes with the instrument to confirm whether there is an alarm code for the corresponding over range. Some brands of instruments will label the cause of the fault in E-xx format.
2. Troubleshooting signal circuits and external interference 1 Check the stability of the excitation power supply: The excitation power supply of the electromagnetic flowmeter needs to meet the tolerance range of ± 10% of the rated voltage. Power phase loss and excessive voltage fluctuations can cause abnormal signal acquisition, leading to full-scale false alarms. 2. Check the electrode wiring status: Loose electrode signal lines, oxidation short circuits, or poor contacts can caus
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III. Investigation of Medium and Pipeline Working Conditions 1 Confirm the full pipe status of the pipeline: The electromagnetic flowmeter must ensure that the measuring section is completely filled with the measured medium. If there is cavitation, pipeline intake, or local blockage causing the empty pipe, it will damage the electrode signal acquisition conditions and cause abnormal display. 2. Verify the actual flow value: Verify the actual flow value through the operating current of the upstream pump, valve opening, bypass flowmeter, etc. If it does exceed the upper limit of the range, adjust the flow meter range or install a flow limiting device. 3. Clean the foreign objects on the electrode surface: After long-term operation, dirt, rust, or scale in the medium will adhere to the electrode surface. The sensor should be disassembled after shutdown, and the electrode surface should be cleaned wi
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