<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="iso-8859-1" %> Process Dynamics
Process Dynamics

Most flow, temperature, pressure and analyser loops can be characterised by three parameters:

Process Gain, Kp (not the same as Controller Gain, Kc)
Process Dead-time, DT
Process Lag-time, T lag

There practical way to obtain the dynamic values is by pefroming step testing and producing a step response. The controller is put into Manual mode, a step change is made to the controller output (typically control valve) and the process response is plotted on a graph. The dynamics are calculated from the graph. It is advisable to look for interactions as the methods used in this tool are not suitable for cases where there are interactions. Other means of obtaining the process dynamics information using autotuning packages is can be obtained by clicking here.