JUNE 2008 – IMPROVE CONTROL OF LIQUID LEVEL LOOPS
Because most processes are self-regulating, it can sometimes be challenging to tune a controller for an integrating process. The principal characteristic of a self-regulating process is that it naturally seeks a steady-state operating level if the controller output and disturbance variables are held constant for a sufficient period of time. Non-self-regulating or Integrating processes can be remarkably challenging to control. This article explores their distinctive behavior.