Endress+Hauser Liquiline CM444 - Page 75

Liquiline CM442/CM444/CM448 Operation
Endress+Hauser 75
Outputting the controller manipulated variable via the current output
Assign "Unipolar+" to the output to which an actuator that can increase the measured value is
connected. Assign "Unipolar-" to the output to which an actuator that can decrease the measured
value is connected.
To output the manipulated variable of a two-sided controller, positive manipulated variables
and negative manipulated variables generally have to be output to different actuators, as most
actuators are able to influence the process in one direction only (not in both). For this purpose,
the instrument splits the bipolar manipulated variable y into two unipolar manipulated
variables, y+ and y-.
Only the two unipolar manipulated variable parts are available for selection for outputting to
modulated relays. If outputting the values via a current output, you also have the possibility of
outputting the bipolar manipulated variable y to one current output only (split range).
TU/TS Options
•Temperature
•Turbidity g/l
•Turbidity FNU
Nitrate Options
•Temperature
•NO3
•NO3-N
Ultrasonic interface(interface
measurement)
Options
•Interface
•Turbidity
SAC Options
•Temperature
•SAC
•Transm.
•Absorption
•COD
•BOD
Controller 1 Options
• Bipolar(only current outputs)
•Unipolar+
•Unipolar-
Controller 2
Mathematical functions All the mathematical functions can also be used as a data source and the
calculated value can be used as the measured value.
Measured valuedepending on theSource of data
Source of data Measured value