Endress+Hauser Liquistation CSF48 - Page 120

Inputs: pH/ORP Incl. combi sensors Liquistation CSF48
120
Zero point (only pH glass or combi sensor) or Operating point (only pH ISFET)
pH glass sensors
The zero point characterizes the condition of the sensor reference. The bigger the deviation
from the ideal value (pH 7.00) the poorer the condition. This can be caused by KCl dissolving
away or reference contamination.
Sensor condition check (only pH glass or combi sensor)
Sensor condition check (SCC) monitors the electrode status and the degree of electrode aging.
The electrode status is updated after every calibration.
The main reasons for a deteriorating electrode status are:
• Glass membrane blocked or dry
• Diaphragm (reference) blocked
Remedial action
‣ Clean or regenerate the sensor.
‣ Replace the sensor if this does not have the desired effect.
Path: Menu/Setup/Inputs/pH or pH/Redox/Extended setup/Diagnostics settings
Function Options Info
Zero point(pH glass or combi
sensor)
Operating point (pH ISFET)
pH glass
-2.00 to 16.00
pH ISFET
-950 mV to 950 mV
Specify your limit values for zero point or operating
point monitoring.
Upper warning limit Factory setting
pH 8.00 / 300 mV
Associated diagnostics code and message text:
505 "Sensor calib." (pH glass)
515 "Sensor calib." (pH ISFET)
Lower warning limit Factory setting
pH 6.00 / -300 mV
Associated diagnostics code and message text:
507 "Sensor calib." (pH glass)
517 "Sensor calib." (pH ISFET)
Path: Menu/Setup/Inputs/pH or pH/Redox/Extended setup/Diagnostics settings
Function Options Info
Sensor Condition Check The function can only be switched on or off. It uses
internal limit values
Function Options
•On
•Off
Factory setting
On
Diagnostics code and associated message text:
127 "SCC sufficient"
126 "SCC bad"