Alicat Mass Flow Controller: Feature - Pressure Control PID Loop

Описание: In this feature video, Alicat applications engineer Alyssa Jenkins explains why setting an Alicat mass flow controller to measure mass flow of gases while controlling the pressure of the gas in your process is useful.

-PRODUCT FEATURED--
MC-Series: Gas Mass Flow Controllers
https://www.alicat.com/models/mc-gas-...

-LINKS-
Alicat website: https://www.alicat.com/
Controlling pressure with an Alicat mass flow controller: https://www.alicat.com/choosing-an-in...
Control loop variable tutorial: https://www.alicat.com/using-your-ali...

Closed loop pressure refers to using a feedback loop based on pressure instead of mass flow. A mass flow controller (MFC) will typically measure the mass flow and adjust the valve to increase or decrease the mass flow to the setpoint. When controlling on pressure, the valve will instead adjust based on the pressure measurement. Imagine, for example, that you are controlling pressure downstream of the Alicat and want to reach 100 PSIA. If the pressure is at 80 PSIA, the MFC will open the valve further until the pressure reaches your setpoint. This is useful in applications where you want to simultaneously control pressure and measure flow rate. Some examples include leak testing and flow/quality checking, where you have to maintain a specific flow vs. pressure curve.