Pressure involved in mass flow meter (MFM) or mass flow controller (MFC)
Mass flow meters (MFM), especially mass flow controllers (MFC), involve pressure issues during use, generally including the following types of pressure:
1、 Pressure resistance This is the safety pressure of the product, which can be understood as the burst pressure.
2、 Maximum operating pressure This is the maximum pressure that the inlet of the flow meter/controller can withstand during operation.
3、 Operating pressure differential This refers to the pressure difference between the inlet and outlet ports. This operating pressure differential mainly involves mass flow controllers (MFC), because MFCs have flow control valves, and this pressure difference refers to the difference between the inlet pressure at the inlet of the flow controller and the resistance or back pressure at its outlet.
4、Pressure involved in mass flow meters (MFM): Mass flow meters (MFM), literally, generally only refer to flow measurement and do not need to control the flow. This type of flow meter has few control components (mainly control valves), so the pressure loss is very small. Generally, during selection communication, only the maximum operating pressure or pressure resistance of the gas inlet (inlet) needs to be known.
5、 Pressure loss of mass flow controller (MFC) (pressure drop, pressure difference):
Pressure loss refers to the pressure loss caused by the friction of the fluid passing through the pipeline or equipment.
For flow controllers installed in the gas path , because each component in the gas path has a different degree of pressure loss, to ensure the normal use of the gas path, the pressure requirements of each component in the gas path must be met, and the pressure loss of each component must be considered to determine the pressure of the pipeline inlet.
If the pipeline design does not consider issues such as flow capacity, it may cause the final pipeline failure to be reflected on the MFC, and the phenomenon may be uncontrollable, the flow cannot reach the set value, and it is uncontrollable outside a certain range.
Therefore, when purchasing a mass flow controller MFC, it is necessary to inform the pressure at the inlet of the flow controller and the pressure at the outlet (or the environment at the outlet), especially some special applications with very low or high pressure loss (pressure drop, pressure difference) requirements. We can adjust the factory before use according to the actual working conditions, so that the MFC can show good performance during use.
Currently, our company's mass flow meters/controllers, ordinary models have a pressure resistance of less than 3 MPa; high-pressure products are 10 MPa to 20 MPa, 40 MPa, 60 MPa, and the pressure of liquid media can be higher, but more than 3 MPa needs to be customized separately.
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