Why does the gas mass flowmeter stop the vibration of the measuring tube and interrupt the measurement?

Gas mass flowmeter is an instrument that uses the principle of thermal diffusion to measure gas flow. The sensor consists of two reference grade thermal resistors (RTDs). One is a speed sensor RH, and the other is a temperature sensor RMG that measures changes in gas temperature. When these two RTDs are placed in the measured gas, the sensor RH is heated, and the other sensor RMG is used to sense the measured gas temperature. As the gas flow rate increases, the airflow removes more heat and the temperature of the sensor RH decreases. Thermal gas mass flowmeters are divided into: insertion type and pipe section type according to the installation method. What is the reason for the gas mass flowmeter to interrupt the measurement due to the stop vibration of the measuring tube? 1. Vibration. The introduction of the U-shaped dual-pipe flowmeter design greatly reduces, but does not absolutely eliminate, the effect of common mode vibration on the mass flowmeter, as external vibration introduced by the piping system can cause the sensor to vibrate in an undesired manner. If the external vibration frequency is equal to or close to the frequency of the sensor drive system, it will interfere with the drive control system of the instrument, causing the flow tube to vibrate unstable or stop. The mass flow meter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measuring instrument, and has a wide range of application values ​​in gas and other fields. As long as the mass flowmeter is properly installed and used, it can effectively improve the measurement accuracy, reduce manpower input, and improve economic benefits. 2. Sediment and suspended matter. Mass flow meters can calculate the mass content of one component in a two-component solution or slurry. The situation that must be avoided for accurate density measurement is: the sediment is attached to the wall of the measuring tube or the solid particles are precipitated from the suspension, and the occurrence of the phenomenon that the flow rate is too low should be minimized. 3. Entrained air bubbles. When the gas mass flowmeter is used for liquid flow measurement, the mass flowmeter will stop working when the mist-like gas content reaches a certain volume content. These bubbles dampen the vibration of the measuring tube used to generate the Coriolis force and should eliminate the gas before the sensor. If this is difficult to achieve, minimize the gas content, i.e. increase the pressure in the sensor as much as possible, and keep the liquid flow rate high to ensure that the gas bubbles are evenly dispersed into smaller bubbles.

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