
24
9.2 Maintenance kits
10 Possible errors
Designation
Part no.
Maintenance kit for ammonia-sensitive sensor
(standard version)
00449637
Maintenance kit for ammonia-sensitive sensor
(extra code 854, low-temperature applications)
00477746
PTFE washers for manual quick-change fitting
(standard, white, 3 washers)
00583477
PTFE washers for manual quick-change fitting
(increased flow rate, black, 3 washers)
00583479
Error
Possible cause
Action
The measured value
drifts
Pressure/
temperature
fluctuations in the
process medium
Keep values
constant
Coolant
concentration is too
high
Use an ammonia
sensor with extra
code 854 (low-
temperature
applications)
Widely fluctuating
measured values
Air bubble
downstream from the
membrane of the
ammonia-sensitive
sensor
Refill/replace
electrolyte
No process medium
escapes from the
overflow of the
manual quick-
change fitting
Porous PTFE washer
is dirty
Replace the PTFE
washer. Customer-
installed filter
upstream from the
manual quick-
change fitting