Electromagnetic water flowmeter | Why is there no water in the pipeline of the electromagnetic flowmeter indicating flow

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When installing an electromagnetic flowmeter on a horizontal pipeline, the two measuring electrodes should not be directly above or directly above the pipeline When installing an electromagnetic flowmeter on a horizontal pipeline, the two measuring electrodes should not be located directly above or below the pipeline, otherwise it will affect the measurement accuracy and signal stability. The specific reasons are as follows:

1. Bubble aggregation problem When an electromagnetic flowmeter is installed on a horizontal pipeline, if the electrode is located directly above the pipeline, gases dissolved in the liquid or bubbles generated by pressure changes will naturally rise and accumulate here. Due to the need for direct contact between the electrode and the measured liquid to induce electrical potential signals, the presence of bubbles can cause poor local contact of the electrode, resulting in fluctuations or interruptions in the measurement signal. For example, in wastewater treatment or chemical production, liquids often contain trace amounts of gas. If the electrode is located directly above, bubbles covering the surface of the electrode will directly interfere with signal acquisition, causing measurement errors. 2. Sediment deposition problem. If the electrode is located directly below the pipeline, solid particles, impurities, or chemical precipitates in the liquid will gradually deposit in this area due to gravity. The accumulation of sediment can form an insulation layer, hindering the conductivity transfer between the electrode and the liquid, resulting in signal attenuation or distortion. For example, in the slurry conveying or food processing industries, liquids may contain high concentrations of suspe

nded solids. If the electrode is located directly below, sediment covering the electrode can significantly reduce measurement sensitivity and even cause instrument failure. Signal stability affects the uniformity of electrode contact with the medium, which is the key to the stable operation of electromagnetic flow meters. The local aggregation of bubbles or precipitates can damage the conductivity of the electrode surface, leading to periodic fluctuations or drift in the output signal. Under long-term operation, this uneven contact may accelerate electrode corrosion and shorten the service life of the instrument. Therefore, during installation, it is necessary to ensure that the electrode is located on the side of the horizontal pipeline (such as at a 45 ° diagonal angle) to avoid direct interference from bubbles and sediment. The electrode position of the electromagnetic flowmeter should be strictly avoided from being located directly above and below the horizontal pipeline, which is based on the engineering requirements of fluid physical properties and electrochemical principles. By optimizing the installation angle, the interference of bubbles and sediment on the electrode can be effectively reduced, ensuring the accuracy and long-term stability of measurement data.

2. How to steal water after installing an electromagnetic flowmeter

Some criminals attempt to steal water resources by turning off the power of the electromagnetic flowmeter or performing illegal operations on its front end.

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