March 08, 2017

PID in an MFC

PID in an MFC

A mass flow controller (MFC) is a compact instrument that does the jobs of three devices: it measures the flow, it provides a control output signal from a PID control algorithm, and it also has the final control element (the control valve).

Because the needs of each application is different and could vary with factors like fluid, inlet and outlet pressures, and control volume the user has the ability to change the control response of the MFC. Through a local (optional) display or through our (free) software on a PC the user can adjust the PID values that are used in the control algorithm and thereby tune his control loop to best fit the application conditions.

  • P: stands for proportional. The larger the proportional value the more quickly the controller will try to bring the process value back to the setpoint.
  • I: stands for integral. This component is a sum of errors and will help correct the process value back to setpoint.
  • D: stand for Derivative. This component looks at the change in flow over time. The effect of Derivative is a slowing of the movement of the process value toward the setpoint.

An MFC is a powerful and complete control device which can be adjusted (or tuned) to exactly fit the needs of your application. Feel free to call on Bronkhorst to assist in customizing the performance of your MFC.

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