4 Functional description
Brief functional description
The controller for the measured variable
conductive conductivity provides the basic
functions for water treatment applications.
The controller has a fixed configuration
with the following features:
n Language-independent operation.
Use of abbreviations, such as:
–
[INPUT]
–
[OUTPUT]
–
[CONTROL]
–
[ERROR]
n Illuminated display
n 3 LEDs indicate the operating sta‐
tuses:
–
[f-REL]
, active
–
[P-REL]
, active
– Error
n Control characteristics:
– P, or
– PID
n Selectable control direction:
– Raise measured value, or
– Lower measured value
n Pulse frequency relay
[f-REL]
for con‐
trol of the metering pump
n Output relay
[P-REL]
, configurable as:
– Alarm
– Limit value
– Pulse width-modulated (PWM)
control output for metering pumps
n Analog output 0/4…20 mA, configu‐
rable:
– Measured value (conductivity
only), or
– Correction variable
n Suction function for all actuators
n
Digital input to switch off the controller
or to process a sample water limit
contact by remote control
n Temperature sensor input (Pt100 or
Pt 1000) for temperature compensa‐
tion
n Degree of protection
– IP67 (wall / pipe mounting)
– IP54 (control panel mounting)
Applications:
n Bleeding of for example air scrubbers
and chillers
n General water treatment, for instance
the monitoring of rinsing baths
Functional description
16
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