Endress+Hauser CCS50D Operating Instructions Manual page 30

Diagnostics and troubleshooting
Error
Display value too low
Display fluctuates
considerably
30
Possible cause
Membrane cap not screwed on fully
Membrane soiled
Air bubble in front of membrane
Air bubble between cathode and
membrane
Input flow of medium too low
Foreign oxidants interfering with
DPD reference measurement
Use of organic disinfectants
Hole in membrane
Remedy
‣
Fill membrane cap with fresh electrolyte
→  34
‣
Screw membrane cap on fully
‣
Clean membrane →  32
‣
Release air bubble
‣
Remove membrane cap, top up electrolyte
‣
Remove air bubble by tapping on the
outside of the membrane cap
‣
Screw on membrane cap
‣
Establish correct flow
‣
Examine medium, check chemicals
‣
Use suitable agent (e.g. as per DIN 19643)
(water may need to be replaced first)
‣
Use suitable reference system
‣
Replace membrane cap
CCS50D
Endress+Hauser