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APT4000PH
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
Controller output YP
[%]
+100 %
-100 %
[pH]
Neutral zone YP=0
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Controller equations
Controller output Y = YP + YPdt + TD
I action
D action
dYP
dt
1
TR
P-action
Proportional action YP
Setpoint - Meas. value
Constant
Y
P
=
*K
C
with:
YP
Proportional action
TR
Reset time [s]
TD
Rate time [s]
KC
Controller gain [%]
Constant 5 (for pH)
500 mV (for ORP)
100 %
50 %
Xw
(Process variables: pH / (mV))
Contr
oller
output Y
K
C
= 500
%
K
C
= 200
%
K
C
= 100
%
K
C
= 50
%
1 / (100)
2 / (200)
3 / (300)
4 / (400)
5 / (500)
Proportional action (Gradient K
C
[%])
Deviation
Neutral zone (Y=0)
Tolerated deviation from setpoint.
The setting “1pH”, for example, permits a deviation of ± 0.5 pH
from the desired value without activating the controller.