It is these factors that affect the gas mass flowmeter

With the development of modern science and technology, some measurement methods and devices for directly measuring mass flow have appeared one after another, thus promoting the progress of flow measurement technology. At present, most of the various types of gas flowmeters used in our lives are used to measure the volume flow of gas. Gas mass flowmeter has the characteristics of high precision, long life, good repeatability, wide flow range, stable and reliable, etc. The method of testing gas quality to measure gas flow is currently in the leading position in China. Then the editor will introduce to you the common factors that affect the gas mass flow meter and the factors that are related to the size of the gas flow. The gas mass flowmeter is designed and produced based on the principle of thermal diffusion. This product is widely used in steel mills, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection and other industries. The gas mass flowmeter is a real direct mass flowmeter, and the user does not need to compensate the pressure and temperature. The instrument has no moving parts, small pressure loss, wide range ratio, high precision, high reliability, simple installation and convenient operation. At the same time, there are many factors that affect the flowmeter. The common influencing factors are as follows: (1) Pressure The pressure of the gas measured by the CMF used in the gas dispenser is not lower than 20MPa, and the pressure is far greater than the atmospheric pressure. The high pressure changes the internal stress of the vibrating tube and increases the equivalent stiffness of the elastic tube, thereby increasing the vibration frequency of the vibrating tube and reducing the phase difference between the two tubes; when the gas flows through the vibrating tube, there is a pressure drop, which makes the vibrating tube The force is asymmetrical, which also affects the phase difference. (2) Temperature The working temperature of the CMF used in the dispenser is much lower than the room temperature, and the influence of temperature must be considered; changes in the medium temperature or ambient temperature will change the Young's modulus of the measuring vibrating tube and affect the structure of the zero drift and other factors. (3) Flow rate Compressed gas has low density and fast flow rate, and its influence cannot be ignored. Ideally, as the flow rate increases, the vibration frequency of the vibrating tube decreases. Generally, the change of fluid density is small, and it can be considered that the flow rate is proportional to the mass flow rate of the fluid. Therefore, the compensation of flow rate can be converted into a nonlinear factor of flow rate change for compensation.

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