Endress+Hauser CCS120D, Operating Instructions Manual

Page: 27 / 44

CCS120D Diagnostics and troubleshooting
Hauser 27
Error Possible cause Remedy
Display value too low Membrane cap not screwed on fully
‣
Fill membrane cap with fresh electrolyte
→  29
‣
Screw membrane cap on fully
Membrane soiled
‣
Clean membrane →  28
Air bubble in front of membrane
‣
Release air bubble
Air bubble between working
electrode and membrane
‣
Remove membrane cap, top up electrolyte
‣
Remove air bubble by tapping on the outside
of the membrane cap
‣
Screw on membrane cap
Input flow of medium too low
‣
Establish correct flow
Foreign oxidants interfering with
DPD reference measurement
‣
Examine medium, check chemicals
Use of organic disinfectants
‣
Use suitable agent (e.g. as per DIN 19643)
(water may need to be replaced first)
‣
Use suitable reference system
Polarization time is too low
‣
Wait for polarization to be completed
pH value
‣
Stay within permitted pH range (pH
5.5 to 9.5.
There is no electrolyte in the
membrane cap
‣
Fill membrane cap with fresh electrolyte
→  29
Display fluctuates
considerably Hole in membrane
‣
Replace membrane cap
Fluid pressure variations
‣
Adjust the process