11 Maintenance
B40IB006EN-D
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11 Maintenance
11.1 Routine Maintenance
The HTK 1200N represents a mechanical precision
instrument and thus has to be handled with particu-
lar care. The chamber is virtually maintenance-free.
Always keep the chamber with the sample holder
flange installed.
To guarantee trouble-free and reliable operation,
please follow the hints below:
•
Remove the protective cap of the vacuum feed-
through only shortly before fitting the appropri-
ate connector.
•
Periodically remove residual sample material
and clean the chamber.
•
Periodically check cooling water circuit.
•
Periodically check the thermocouple for proper
functioning. If required, validate the temperature
readout with an appropriate standard sample.
•
Make sure that the O-ring of the sample holder
flange is always slightly coated with vacuum
grease.
Periodically clean the O-Ring, the groove and
the sealing surface with alcohol.
11.2 Check the Functioning of the Flow
Controller
•
Check the proper functioning of the flow control-
ler once a week as described in chapter 5.7.
11.3 Exchanging of Parts
11.3.1 Switching off the Instrument
1. Switch off the CCU 1000 by using the power
switch on the front side of the instrument.
2. Unplug all cables from the rear side of the
instrument.
Perform the recommended maintenance work regu-
larly to ensure the smooth long-term operation of the
instrument.
11.3.2 Replacing the Window Foil
The window in the housing is covered by either of
the following foils:
•
When operating the HTK 1200N at tempera-
tures
up to 1000 °C
an aluminium-coated Kap-
ton foil of 125 µm thickness is used to cover the
housing window. This foil guarantees minimum
absorption.
•
For temperatures
above 1000 °C
a combination
of a graphite foil and a non-coated Kapton foil of
125 µm thickness is used.
To seal the window, the foil is pressed towards an
O-ring using two clamps.
The combination of graphite foil and non-coated
Kapton foil is mounted upon delivery.
To mount or exchange the window foil, proceed as
follows:
1. Loosen the screws of the two clamps with the
screw driver contained in the accessory box.
NOTICE
Risk of damage.
After long-term operation, we recommend clean-
ing both the O-ring and the groove using a lint-
free paper towel wetted with a suitable solvent,
e.g. alcohol. After this, slightly cover the O-ring
with vacuum grease (contained in the accessory
box).
NOTICE
Risk of damage.
Do not operate the HTK 1200N chamber if the
water flow controller does not work properly.
NOTICE
Risk of damage
Above 1000 °C it is crucial to mount the combi-
nation of a graphite foil and a non-coated Kapton
foil! The graphite foil protects the Kapton foil
from any damage due to high temperature!
NOTICE
Risk of damage
Check the window foil regularly and exchange it,
if it is leaky or foggy!
