Outputs
DIQ/S 281
110
ba77244d01
08/2020
The controller works with the following amplification:
Settings
Within the proportional range an increase of the concentration by 1 mg/l
causes a reduction of the output current by 1 mA. If the measured con-
centration is 5 mg/l, for example, 11 mA is output:
The highest concentration at which the controller still works in the propor-
tional range is 8 mg/l (corresponding to
Imin =
8 mA) and the lowest is
2 mg/l (corresponding to
Imax =
14 mA).
mg/l
mA
1
mg/l
6
mA
6
K
=
=
(
)
mg/l
mg/l
mg/l
mA
1
mA
12
I
Regler
5
4
−
⋅
+
=
(
)
mA
11
mg/l
1
mg/l
mA
1
mA
12
I
Regler
=
−
⋅
+
=
Setting
Selection/Values
Explanation
Measured variable
Main variable
Adjoining variable
Main variable
designates the
actual measured parameter of
the sensor (e.g. pH, oxygen,
etc.).
Adjoining variable
designates
an additional measured
parameter (e.g. temperature).
Nominal value
within the measuring
range (sensor-
dependent)
Nominal value the measured
value is regulated to
Xp
5 ... 100 %
-5 ... -100 %
% of the measuring
range
Proportional range of the
controller.
Negative values result in a
positive characteristic curve.
Imin
0 ... 20 mA
Lower current limitation *
Imax
0 ... 20 mA
Upper current limitation *
* Note:
Spacing between
Imin
and
Imax
:
at least 5 mA
