Xylem DIQ/S 281 Operating Manual page 122

Outputs
Characteristic
curve of the
proportional
controller
Application
example
122
td
Regulator type
0
PI controller
1 to 9999
PD controller
1 to 9999
PID controller
For a pure P controller the correlation between the measured value and current
I on the controller output results in the following characteristic curve:
figure 6-17 Proportional controller (negative characteristic curve)
The proportional range
sensor. If a value is entered for the parameter
controller has a positive characteristic curve (example figure 6-17). To obtain a
positive characteristic curve, a negative value must be entered for
 Regulation of the oxygen concentration
 Sensor: TriOxmatic 700 IQ (measuring range: 0 to 60 mg/l)
Control parameter
Nominal value
Xp
Imin
Imax
Io
ti
[s] [s]
1 to 9999
0
1 to 9999
Xp
is limited by the measurement range of the linked
Value
4 mg/l
10 % of the measuring range
or 6 mg/l
8 mA
14 mA
12 mA
Xp
that is greater than zero, the
Xp
ba76226e02
DIQ/S 281
.
03/2023