Hach-Lange SI794 P User Manual - Manual (Page 84)

84
P Controller
Application in integrating systems
(e.g. closed tank, batch processes).
PI controller
Application in non-integrating systems
(e.g. drains).
PID controller
The additional derivative action compensates for measurement
peaks.
Controller characteristic
Controller functions
PID controller
Setpoint
Proportional
action Y
P
[%]
+100 %
-100 %
pH
Neutral zone Y
p
=0
Relay 1
Relay 2