Pneumatic PID controller

  • PID controller is actually the most common type produced, because it can be used to accomplish any of the previous modes by setting of restrictions.
  • It is basically combination of P, I & D operating modes.
  • By opening or closing restrictions, the three-mode controller can be used to implement the other composite modes.
  • Proportional gain, reset time, and rate are set by adjustment of bellows separation and restriction size.