Process Unit 73 LF - Knick

Output 2 can be used to control valves. Here, the
current varies in accordance with the controller
output.
The currently valid controller output can be shown
on the secondary display (see Pg. 2–1).
Output 2
20 mA 0(4) mA 0(4) mA
20 mA
Straightway valve
0(4) mA 20 mA
Mixing valve
Controller output Y [%]
100
50
0
–50
–100
0
Y
X
Beginning of control
Output range
below X W
Corner
Output range
above X W
Limit contact 1
Setpoint X W
e.g. 50 mS/cm
Limit contact 2
Y Corner
X
50 100
Controlled variable X [mS/cm]
Neutral
zone
End of control
Fig. 9–10
Control Characteristic
Capabilities 9–35