Endress+Hauser Liquistation CSF48 - Page 100

Additional functions Liquistation CSF48
100
6.3.4 Degassed conductivity
Carbon dioxide from the air can be a contributing factor to the conductivity of a medium. The
degassed conductivity is the conductivity of the medium excluding the conductivity caused by
carbon dioxide.
In the power station industry, for example, it is advantageous to use the degassed conductivity:
• The percentage of conductivity caused by corrosion products or fouling in the feed water can
be determined as early as when the turbines are started. The system excludes the initially high
conductivity values resulting from the ingress of air.
• If carbon dioxide is regarded as non-corrosive, the live steam can be directed to the turbine far
earlier during startup.
• If the conductivity value increases during normal operation, it is possible to immediately
determine an ingress of coolant or air by calculating the degassed conductivity.
pH source Connected pH sensor Set the input for the pH sensor and the input for the ORP
sensor. Measured value interrogation is obsolete as you
must select pH or ORP mV.
Redox source Connected ORP sensor
Calculated rH Read only View this value in a user-defined measuring screen or
output the value via the current output.
Path: Menu/Setup/Additional functions/Mathematical functions/MF 1 to 6/Mode/Degassed conductivity
Function Options Info
Calculation Options
•Off
•On
Factory setting
Off
On/off switch for the function
Cation conductivity Connected conductivity
sensor
"Cation conductivity" is the sensor downstream from the
cation exchanger and upstream from the "degassing
module", "Degassed conductivity" is the sensor at the
outlet of the degassing module.
Measured value interrogation is obsolete as you can only
choose conductivity.
Degassed conductivity Connected conductivity
sensor
CO2 concentration Read only View this value in a user-defined measuring screen or
output the value via the current output.
Path: Menu/Setup/Additional functions/Mathematical functions/MF 1 to 6/Mode/rH calculation
Function Options Info