Endress+Hauser CCS120D, Operating Instructions Manual

Page: 28 / 44

Maintenance CCS120D
28 Hauser
9 Maintenance
Please note the information on the safety data sheet to ensure safe use of the electrolyte.
Take all the necessary precautions in time to ensure the operational safety and reliability of
the entire measuring system.
NOTICE
Effects on process and process control!
‣
When carrying out any work on the system, bear in mind any potential impact this could
have on the process control system and the process itself.
‣
For your own safety, only use genuine accessories. With genuine parts, the function,
accuracy and reliability are also ensured after maintenance work.
9.1 Maintenance schedule
Interval Maintenance work
If deposits are visible on the membrane (biofilm, limescale) Clean sensor membrane
→  29
If dirt is visible on the surface of the electrode body Clean electrode body of
sensor
Recommended calibration intervals:
• Drinking water, industrial water, process water, cooling water: depending on the
special conditions (1 to 4 weeks)
• Swimming pools: weekly
• Whirlpools: daily
Sensor calibration
• If cap is replaced
• If the slope is too low or too high relative to the nominal slope and the membrane cap
is not visibly damaged or dirty
Fill membrane cap with
fresh electrolyte →  29
• If there are grease/oil deposits (dark or transparent spots on the membrane)
• If slope is too high or too low or sensor current is very noisy
• If it is obvious that the sensor current is significantly dependent on the temperature
(temperature compensation not working).
Replace membrane cap
→  29
In the event of visible silvery or white changes to the counter electrode (brown/gray or
yellow/green discoloration is not a problem) Regenerate sensor
→  32
9.2 Maintenance tasks
9.2.1 Cleaning the sensor
Removing the sensor from assembly CCA151
1. Remove the cable.
2. Unscrew the union nut from the assembly.

3. Pull sensor out through opening in assembly.