The solution of electromagnetic flowmeter manufacturers to measure bubbles in liquid

The solution of electromagnetic flowmeter manufacturers to measure bubbles in liquidThe causes of electromagnetic flowmeter to measure the treatment method of bubbles in liquid: the formation of bubble-like gas in liquid is inhaled from the outside and dissolved gas (air) in the liquid is transformed into free form Bubble in two ways. If the liquid contains large air bubbles, the entire electrode can be covered when the electrode is wiped, and the input circuit of the flow signal is instantaneously opened, causing the output signal to shake. Solution: For the case where the measured medium contains air, if the judgment is caused by the installation position, such as the electromagnetic flowmeter is installed at the high point of the pipe system and the gas is trapped or the flowmeter shakes due to the inhalation of air from the outside, the replacement installation position is The solution, as shown in Figure 1, is to install at the lowest point of the pipeline or use a U-shaped pipe. However, in many applications, the diameter is large or the installation position is not easy to change. It is recommended to install a gas collecting bag and an exhaust valve upstream of the flowmeter, as shown in Figure 2. An electromagnetic flowmeter with a diameter of DN2200, the shaking of the display caused by air bubbles can reach 20-50%. After the exhaust device is installed, the measurement returns to normal. Judgment method: The simple judgment method is to cut off the excitation circuit current of the magnetic field when it encounters shaking. If the instrument still displays and is unstable at this time, it means that it is mostly caused by the influence of bubbles. If the electrode resistance is measured with a pointer-type multimeter at this time, the loop resistance of the electrode can be measured to be higher than normal, but this test requires the long-term accumulated test experience and data of the technicians.

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