The composition of bubble-like gases in various liquids There are two ways of inhaling from the outside and converting gas (air) dissolved in the liquid into free bubbles.
Causes and solutions to the problem of bubbles in liquids when measuring with electromagnetic flowmeters:
Causes of bubbles in measuring pipes:
The composition of bubble-like gases in various liquids There are two ways of inhaling from the outside and converting gas (air) dissolved in the liquid into free bubbles. If the liquid contains large bubbles, the entire circuit will be covered when it rubs the electromagnetic flowmeter current, causing the flow signal input circuit to instantly open, causing the output signal to shake. Judgment method: The simplest judgment method is to cut off the excitation circuit current of the magnetic field when encountering shaking. If the instrument still displays and is unstable at this time, it means that it is mostly caused by bubble influence. If the resistance is measured with a pointer multimeter at this time, it can be measured that the circuit resistance of the electromagnetic flowmeter is higher than normal.
However, this test requires the long-term accumulated test experience and data of professionals. Solution: If the measured medium contains air, if it is determined to be caused by the installation position, such as the electromagnetic flowmeter is installed at a high point in the piping system and gas is trapped or the outside air is sucked in, causing the flowmeter to shake, the installation position is to be changed. The best solution is to install it at the lowest point of the pipeline or use a U-shaped pipe. However, in many applications where the diameter is large or the installation location is difficult to change, it is recommended to install a gas collecting bag and an exhaust valve upstream of the electromagnetic flowmeter.
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