ABSTRACT
One of the most common control problems in the process industry is control of a process with significant dead time. Control of such systems will usually involve a model-based approach. Dead time compensator algorithms are typically written at the supervisory level and output to the basic regulatory level. A dead time compensator is used in control of a process with dead time; the process input is controlled by a secondary control loop. The process is a distillation tower, the controlled variable is the concentration, and the control variable is the temperature. Dead time can raise example from analyser cycling time, holdup in the reflux drum, and so forth. An order plus dead time model is shown because most processes in the process industry can be adequately described by such a model. Processes with higher order model plus dead time are handled in a similar manner.
