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What is the fault description of the electromagnetic flowmeter during the commissioning period?

What is the fault of the plug-in electromagnetic flowmeter during the commissioning period, the fault of the split type electromagnetic flowmeter and the initial commissioning, but once the fault is improved, it will not appear again under the same conditions. Common faults and installation and commissioning period are the main reasons, environmental interference, fluid characteristics, three reasons.

Pipeline system installation, etc., usually the electromagnetic flow sensor is installed in an incorrect position. Commonly, for example, the flow sensor is installed in a natural gas pipeline network that facilitates the accumulation of high reserves. The flow sensor does not have any pressure, and the liquid is directly discharged into the atmosphere to form a complete measurement. The tube; installed in the air due to the vertical line dirty, may appear to be special, because the potential is underwater, to ensure that there is no floating.

Environment, main pipeline stray current interference, space electromagnetic wave interference, large motor magnetic field interference, etc. Pipe stray current interference usually adopts good grounding protection to obtain satisfactory separate measurement, but in the case tube has strong stray current (such as The electrolysis workshop line can not be overcome, and the unique measures of the flow sensor and the pipeline should be adopted. Electromagnetic wave-space signal cable introduction, usually single or multiple shield protection, but also encountered shield protection can not be overcome.

The fluid liquid contains tiny bubbles which are usually evenly distributed and do not affect the normal measurement. Only the volume flow liquid and the gas are combined; the air bubbles increase the fluctuation of the output signal, and if the large bubble covers the entire flow through the electrode surface of the electrode, the signal of the electrode is instantaneously disconnected. In the circuit, the output signal will produce large fluctuations.

Low-frequency (50 / 16 hz-50 / 6 Hz) rectangular wave excitation split electromagnetic flowmeter measures the liquid containing solids over a certain amount of slurry will produce noise, the output signal will also have a certain degree of fluctuation.

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