Burkert Type 8620 - Manual (Page 125)

mxCONTROL Type 8620
Page 125
14.7 Chlorine / Redox Control (CL_ORP)
The chlorine/redox control function is designed for P and PI control.
The chlorine/redox output is designed to provide a series of output pulses (for the control of
electronic solenoid operated chemical dosing pumps).
These modules are explained
below.
Figure 63: CL_ORP
PI Controller
The description of the Proportional Integral (PI)-Controller is consistent to the PI-part of the PID
Controller in section “PID Controller” in chapter 14.2. Specifics / differences are described below.
Proportional part / Module sense of action:
The normal module sense of action is defined:
Proportional part: Yp[%] ) ( PV SP Kp
− ∗ =
It can be illustrated as shown in the following figure:
Figure 64:
Sense of action of the
module (CL_ORP)
Deadband:
A deadband doesn’t exist for this module.