The mass flowmeter will interrupt the measurement during use

In the use of mass flowmeter, the amplitude movement is the fundamental way of flowmeter measurement. How to maintain the correct amplitude movement also needs to be analyzed from the aspects of installation, use environment and measured medium. The mass flowmeter will interrupt the measurement during use. So what is the reason for the mass flowmeter to interrupt the measurement? 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 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. When the pressure of liquid liquefied gas is lower than its vapor pressure, vaporization will occur. Due to the geometry of the measuring tube and the pressure drop across the sensor caused by the flow of the liquid, the effective pressure of the liquid liquefied gas can be reduced below its vapor pressure. Bubbles have the same effect. Therefore, once the size of the sensor is determined, the back pressure required to maintain the liquid state can be calculated. Only when the back pressure required by the sensor is met during the operation of the flow meter can the flow meter interrupt the measurement phenomenon be effectively avoided.

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