8 Upkeep and Cleaning
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C58IB004EN-D
8 Upkeep and Cleaning
8.1 Checking the Dome
The dome should be regularly checked, depending
on the operating hours, the usual operating tem-
peratures and the applied atmospheres.
8.2 Replacing the O-rings
In general, commercially available O-rings made of
Viton are used.
While detaching an O-ring, make sure that the seal-
ing surfaces remain undamaged.
Before fitting a new O-ring, clean the sealing surfac-
es with a suitable solvent.
8.3 Changing the Hot Plate
1. Open the sample plate fixing screws.
2. Remove the old hot plate.
3. Mount the new hot plate and remount the
screws.
CAUTION
• Always lift the dome by the fixing ring.
• Never touch the dome during operation,
especially when it is evacuated or at elevated
temperatures.
• Check the dome for cracks and coatings on
the inner surface.
• If the inner surface of the dome has become
coated with evaporated sample components,
clean it with a dry cloth.
If cracks are observed, replace the dome (refer
to the reference guide C58IB002EN).
NOTICE
The cavities between the heating wires are filled
with a ceramic paste. This paste provides a good
thermal contact between the heater and the hot
plate. Moreover, it acts as electrical insulation
between the heating wires. Depending on the
previous thermal treatment different cases can
occur.
• The surface of the ceramic is rough.
Please use an abrasive paper and gently
smoothen the surface to provide a good thermal
contact to the hot plate.
• Parts of the ceramic powder are brittle and
fall off the heater. The resulting cavities would
give poor thermal accuracy.
Please send the DHS 1100 to Anton Paar to
repair the heater.
NOTICE
It is recommended to validate the temperature of
the new hot plate by either measuring the transi-
tion points of known standards or by using the
thermal expansion method of known sub-
stances.
