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8 Maintenance
Note:
The flow rate of the medium through the quick-change
fitting should be checked regularly! The nature of the
process medium must be taken into consideration when
determining the check interval. The typical flow rate is a
few milliliters per day and depends on the parameters of
the coolant (pressure, temperature, viscosity, etc.).
If no coolant emerges at the overflow of the quick-
change fitting, check the porous PTFE washer in the
quick-change fitting and replace it if necessary, Section
9.1.1 "Replacing the PTFE washer in the quick-change
fitting", page 22.
If the flow rate of the medium is too low in general, the
porous PTFE washer (part no. 00583477, white,
standard) can be replaced by the less dense version
(part no. 00583479, black, for higher flow rate), Section
9.1.1 "Replacing the PTFE washer in the quick-change
fitting", page 22.
Typically the electrolyte of the gas-sensitive sensor must
be replaced semi-annually or annually depending on the
coolant that is used.
The gas-sensitive sensor has a high resistance.
Therefore a greater tendency to drift must be factored in.
This should be taken into consideration when selecting
the limit values for alarms (ammonia leaks).
If the drift of the sensor signal is unusually great, the
electrolyte must be replaced, Section 8.1 "Refilling/
replacing the electrolyte", page 17.