About MFC "Pressure"

1. Operating differential pressure 、 Pressure resistance and maximum operating pressure What is the difference?

Operating differential pressure Refers to the pressure difference between the inlet and outlet ports

Pressure resistance Is the safe pressure of the product, which can be understood as burst pressure

Maximum operating pressure Is the maximum pressure that the inlet end of a flow controller can withstand during operation

2 Pressure loss of a mass flow controller What is it?

Pressure loss refers to the pressure reduction caused by friction when gas passes through pipes or equipment. The pressure loss varies among different models of flow controllers, and even within the same model, it differs across various flow ranges. The pressure loss of a flow controller is generally its minimum operating differential pressure, while the pressure loss specifications for flow meters can be found in the user manual

3. Should pressure loss be considered for flow controllers installed in a gas path?

Yes, because every component in a gas path experiences varying degrees of pressure loss. Therefore, to ensure normal operation of the gas path, it is essential to meet the pressure requirements of each component within the gas path by considering the pressure loss of each component to determine the inlet pressure of the pipeline. Specific pipeline designs involve detailed calculation formulas, such as flow capacity or each gas path component's CV value calculation formulas, etc. If flow capacity and other factors are not considered in the pipeline design, it could lead to pipeline failures that manifest as issues with the MFC, such as uncontrollability, inability to reach the set flow rate, or uncontrollability outside a certain flow range

4. In front of the flow controller end What should the pressure be? What range should the differential pressure be within?

The maximum operating pressure varies for different models of flow controllers and the differential pressure range also differs for the same model with different flow ranges. Specific parameters for different models should be referred to in their corresponding user manuals