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What is the concept of the pressure differential range of the mass flow controller?

A mass flow control valve is provided in the mass flow controller (MFC). The valve can adjust the flow rate from the controller to the full scale of the measurement through the controller. During the process of work, a control valve inlet and outlet can generate a Pressure drop, that is pressure difference. The working pressure range of MFC is usually 0.1~0.3MPa. If the pressure difference is lower than the minimum value (0.1 MPa), it may be controlled to reach the full-scale value; if it is higher than the maximum value (0.3MPa), the flow rate may be closed. Cannot be less than 2% FS. When the user uses the MFC, regardless of whether the user's working chamber is vacuum or high pressure, the pressure difference between the inlet and outlet of the MFC should be kept within the required pressure difference, and the pressure must be relatively stable.

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