Whether air bubbles affect magnetic inductive flowmeter error

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The presence of these uneven bubbles often leads to errors in the measurement of the ammeter and affects its use. Generally, the fluid measured by an ammeter will contain some air bubbles, but if these are evenly distributed, they will not affect the measurement. However, once the bubbles become larger, when the electrode is rubbed, the entire electrode can be covered, which allows the flow signal input to turn on momentarily, resulting in vibration of the output signal.

How to determine that the magnetic inductive flowmeter is caused by air bubbles in the measured liquid? How to deal with this situation? Let us briefly introduce.

• 1、When the measurement appears to be wobbly, immediately cut off the excitation circuit of the magnetic field. If the instrument still displays and is unstable at this point, this means that it is mainly caused by the influence of air bubbles.
• 2、After it has been determined that a large number of air bubbles are affecting the measurement results of the electromagnetic flowmeter, a solution should be found accordingly. If it is determined that the installation position is causing a large number of bubbles to merge into the liquid, for example, if the electromagnetic flowmeter is installed at a high point in the pipeline and stored gas or air drawn in from the outside is causing the flowmeter to vibrate, a change in the installation position is a more effective solution.
• 3、In many applications where the diameter is large or the installation position is difficult to change, it is recommended that a gas collection bag and exhaust valve be installed upstream of the solenoid flowmeter to eliminate excess gas, reduce the influencing factors on the measurement results, and ensure measurement accuracy.