Endress+Hauser Liquistation CSF34 - Page 138

Operation Liquistation CSF34
138 Endress+Hauser
Menu/Setup/Additional functions/Mathematical functions/MF1 to 8/Mode = Redundancy
Function Options Info
Deviation control Selection
• Off
• On
Factory setting
Off
You can monitor the redundancy. Specify an
absolute limit value that must not be exceeded.
Deviation limit Depends on the selected
measured value
Redundancy Read only View this value in a user-defined measuring
screen or output the value via the current output.
Mathematical function
assignment view
Overview of the configured functions
rH value
To calculate the rH value, a pH sensor and an ORP sensor must be connected. It is
irrelevant whether you are using a pH glass sensor, an ISFET sensor or the pH electrode of
an ISE sensor.
Instead of the mathematical functions, you can also connect a combined pH/ORP sensor.
‣
Set the main measured value simply to rH.
Menu/Setup/Additional functions/Mathematical functions/MF1 to 8/Mode = rH calculation
Function Options Info
Calculation Selection
• Off
• On
Factory setting
Off
On/off switch for the function
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 Measured value interrogation is
obsolete as you must select pH or ORP mV.
ORP 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.
Mathematical function
assignment view
Overview of the configured functions
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.
Advantages of using degassed conductivity taking the example of a power station:
• The conductivity caused by corrosion products or contamination in the feed water is
determined as soon as 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.