Endress+Hauser CCS50D, Operating Instructions Manual

Page: 31 / 52

CCS50D Maintenance
Hauser 31
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
→  33
If dirt is visible on the surface of the electrode body Clean electrode body of
sensor →  33
• Slope depending on application:
– At least every 12 months under constant conditions in the permitted range of
0 to 55 °C (32 to 131 °F)
– In the case of severe temperature fluctuations, e.g. from 10 °C (50 °F) to 25°C (77 °F)
and back 100 times
• Zero point calibration:
– If operated in concentration range below 0.5 mg/l (ppm)
– If negative measured value is displayed with factory calibration.
Sensor calibration
• If electrolyte counter warning is active
• If cap is replaced
• For determining the zero point
• 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
→  34
• 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
→  34
If changes are visible on the cathode or anode (brown coating no longer present) Regenerate sensor
→  37