How to reduce the error caused by air bubbles in the electromagnetic flowmeter

• There are many bubbles in the electromagnetic flowmeter during the measurement of liquids, which often leads to errors in the measurement of the flowmeter and affects the use.

Generally, the fluid measured by the electromagnetic flowmeter will contain some bubbles, and if the distribution of these bubbles is relatively uniform, it will not affect the measurement, but once the bubble becomes larger, the entire electrode can be covered by the electrode when the electrode is wiped, so that the flow signal is The input loop is momentarily open, causing the output signal to sway.

How to judge the measurement error of the electromagnetic flowmeter caused by bubbles in the liquid to be tested? How to deal with this situation? Let's briefly introduce it.

When the measurement result is shaken, the excitation loop current of the magnetic field is cut off immediately. If the meter still displays and is unstable at this time, it is mostly caused by the influence of the bubble.

After determining a large number of bubbles affecting the measurement results of the electromagnetic flowmeter, it is necessary to find a relevant solution. If it is judged that a large amount of air bubbles are mixed into the liquid caused by the installation position, such as the electromagnetic flowmeter is installed at a high point of the pipe system and the gas is stored or externally inhaled. If the air causes the flowmeter to slosh, replacing the installation position is the most effective solution. However, in many applications, the diameter is large or the installation position is not easy to change. It is recommended to install the air bag and the exhaust valve upstream of the electromagnetic flowmeter to eliminate excess gas. , to reduce the factors affecting the measurement results, to ensure the accuracy of the measurement.

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