Kaifeng large flow meter | Flow scoring direction | SILVER|compressed air flow meter

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1. Analysis of the reasons for the large fluctuations in flow rate of large-diameter intelligent electromagnetic flowmeter

The main reason for the large fluctuations in flow rate of large-diameter intelligent electromagnetic flowmeter is improper installation point selection, including insufficient length of straight pipe section and operation of pipeline under full capacity. The following is a detailed analysis: Insufficient length of straight pipe section: According to the installation rules of the flowmeter, it is necessary to ensure that the first 10 and last 5 straight pipe sections (the upstream straight pipe section is 10 times the diameter of the pipe, and the downstream is 5 times the diameter of the pipe), and there should be no interference sources such as water pumps and valves in the upstream and downstream. In the case, the flow meter was installed near the water pump, just over 2 meters away, far from meeting the requirements. The turbulence and pressure fluctuations generated by the water pump can directly interfere with the measurement of the flow meter, resulting in unstable data. Pipeline operation under full capacity: The installation position is at the highest point of the pipeline, causing the liquid in the pipeline to be unable to fill, resulting in a state of incomplete pipeline. The electromagnetic flowmeter operates based on Faradays law of electromagnetic induction, which requires the measured medium to fill the pipeline. When the tube is not filled, mixing of liquid and air can cause uneven distribution of conductivity, severe signal fluctuations, and subsequently trigger flow data jumps (such as sudden increases from tens of cubic meters to thousands of cubic meters). Solution and

suggestion: Adjust the installation position: Move the flowmeter to the lowest point of the pipeline to ensure that the pipeline is always in a full state. When reselecting the installation point, it is necessary to meet the requirements of the first 10 and last 5 straight pipe sections, and stay away from interference sources such as water pumps and valves. If space is limited, flow field distribution can be improved by installing rectifiers (such as honeycomb rectifiers), but the effect may not be as good as directly adjusting the position. Optimize straight pipe section conditions: If the flow meter cannot be moved, the existing pipeline needs to be modified. For example, extending the upstream straight pipe section to 10 times the pipe diameter (DN500 pipeline requires 5 meters or more), and downstream to 5 times the pipe diameter (2.5 meters or more), and removing or moving away from equipment such as pumps and valves. Check whether there are local resistance components such as reduced diameter and bends in the pipeline. If there are, further extension of the straight pipe section or other compensation measures should be taken. Other precautions: Ensure that the flowmeter is well grounded to avoid electromagnetic interference. Regularly inspect the inner wall of the pipeline for scaling or sediment accumulation, which may alter the cross-section of the flow channel and affect measurement accuracy. Verify whether the liquid conductivity meets the requirements of the flowmeter (usually ≥ 5 μ S/cm), as low conductivity can cause signal attenuation. Summary: The root cause of the flow fluctuation problem in the case is that the installation point selection violates the basic requirements of the length of the straight pi

Kaifeng large flow meter | Flow scoring direction

1. Analysis of the reasons for the large fluctuations in flow rate of large-diameter intelligent electromagnetic flowmeter

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