Endress+Hauser Liquistation CSF48 - Page 151

Liquistation CSF48 Inputs: Chlorine
151
Electrolyte counter
The electrolyte consumption is calculated on the basis of the amount of charge that penetrates
the sensor diaphragm.
The following applies for the sensor CCS142D:
Half the chloride would be consumed and the entire dihydrogen phosphate would be converted
to monohydrogen phosphate in an electrolyte filling (4 ml) at 20 000 000 μAs (=20 As). This
would render the electrolyte and the sensor unusable.
With a view to predictive maintenance, you should replace the electrolyte at 10 000 000 μAs,
and preferably at 5 000 000 μAs. 25%-50% of the dihydrogen phosphate is then consumed.
The calculation presumes that the buffer of the electrolyte is only changed by the
electrochemical conversion of hypochlorous acid. It does not take into account the penetration
of acids or bases into the sensor.
Depending on the application it can be necessary to change the electrolyte before a charge of
5 As is reached.
Diagnostic behavior
--> "Inputs: General/Frequently occurring functions" section  ä 108
13.2.6 Tag control
--> "Inputs: General/Frequently occurring functions" section  ä 108
13.2.7 Sensor replacement
--> "Inputs: General/Frequently occurring functions" section  ä 108
13.2.8 Data processing factory setting
--> "Inputs: General/Frequently occurring functions" section  ä 108
Path: Menu/Setup/Inputs/Chlorine/Extended setup/Diagnostics settings
Function Options Info
Electrolyte counter 0 to 2000000 μAs
Function Options
•On
•Off
Factory setting
On
Warning limit Factory setting
1000000 μAs
Diagnostics code and associated message text:
534 "Sensor calib."