What affects mass flow controllers

What will the mass flow controller be affected? The mass flow controller is a kind of instrument for measuring gas flow. Its measured value is not inaccurate due to fluctuations in temperature or water pressure. It does not need temperature and water pressure compensation, and the flow rate can be set according to needs. , automatically keep the flow constant at the preset value, even if the system water pressure fluctuates or the ambient temperature changes, it will not make it deviate from the preset value. It can accurately control the given amount of gas, which is used for the proportional control of different gases for the flow control of many processes. Directly measure the mass flow of gas and output the mass flow signal without other facilities. It can accurately measure the small flow rate, choose the shunt device, and can measure the large flow rate, and the range of temperature and water pressure is very large. At this stage, the temperature measurement error of similar domestic products is±Above 0.5°C, our mass flow controllers use high-quality temperature sensors and precision measurement circuits, and the temperature accuracy far exceeds that of similar domestic products. With a professional temperature compensation algorithm, it provides a reliable guarantee for the measurement of flow and density. What are the factors that interfere with the mass flow controller today? Next, the editor will give you a brief analysis; 1. Water pressure The water pressure of the gas measured by the mass flow controller used in the gas dispenser is not lower than 20MPa , the water pressure is much higher 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 support is different, which also affects the phase difference. 2. Temperature interference The working temperature of the CMF used as a dispenser is much lower than room temperature, so temperature interference must be considered; changes in material temperature or ambient temperature will change the Young's modulus of the measuring vibration tube and interfere with the zero drift structure and other factors. 3. Flow rate problem Compressed gas has low density and fast flow rate, and its interference cannot be ignored. Under desired conditions, the vibration frequency of the shock tube decreases as the flow rate increases. Generally, the change in fluid density is small, and it can be considered that the flow rate is proportional to the mass flow rate of the fluid, so the compensation of the flow rate can be converted into a nonlinear factor of the flow rate change for compensation.

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