Knick Stratos Pro A401B CONDI, User Manual

Page: 92 / 160

92
Controller Functions
Proportional action Y
P
Setpoint - Meas. value
Measuring range
Y
P
=
*
with:
Y
P
Proportional action
T
N
Reset time [s]
T
D
Rate time [s]
K
C
Controller gain [%]
1
Controller equations
K
C
Neutral zone (Y=0)
Tolerated deviation from desired value.
With the setting “1 mS/cm”, for example, a deviation of ± 0.5 mS/cm
from the desired value does not activate the controller.
+100 %
50 %
X
w
Con
tr
oller
output Y
K
C
= 500 %
K
C
= 200 %
K
C
= 100 %
K
C
= 50 %
Proportional action (Gradient K
C
[%])
Deviation
Process variables: Cond, Conc, SAL
MR*0.2 MR*0.4 MR*0.6 MR*0.8 Measuring
range (MR)
Controller output Y =
I action D action
dY
P
dt
1
T
R
P action
Y
P
+ Y
P
dt + T
D