2 Overview
B40IB006EN-D
11
heater, if the housing temperature reaches
70 °C and
•
a contact switch that detects whether the sam-
ple holder flange is mounted and which shuts off
the heater, if it is not.
The adapter, which is used to mount the
HTK 1200N on the goniometer is fixed to the hous-
ing’s base plate. Vertical alignment of the
HTK 1200N versus the goniometer axis is done by
using the height alignment screw or the alignment
stage.
Depending on the type of goniometer used, evacu-
ation can be performed through the adapter or
through the vacuum flange on the lid.
Along the radiation path (entrance and exit of X-
rays), the housing is slotted. The window foil is
pressed against an O-ring by means of two clamps
and covers the window openings. The window foil is
either an aluminium-coated Kapton foil of 125 µm
thickness (for work up to 1000 °C) or a combination
of a graphite foil and a non-coated Kapton foil of
125 µm thickness (for work above 1000 °C).
TIP: The graphite foil and non-coated Kapton foil
are mounted upon delivery.
The oven consists of an electrical heater surround-
ing the sample holder and thermal insulation around
the heater.
The electrical heater is formed in a special way to
uniformly heat the sample, which is located in the
center of the heater. The heating filament is made of
Kanthal.
The thermal insulation consists of foamed alumina
and provides a very uniform temperature distribu-
tion inside the oven.
TIP: The foamed alumina shell is very porous with a
large internal surface. Even when operated with a
vacuum pump, small amounts of adsorbed gas, in
particular oxygen, are continuously released from
the alumina. If the sample material is very sensitive
to oxygen, this can lead to undesired sample oxida-
tion at elevated temperature.
2.2.2 Lid
Fig. 4: Chamber Lid
1
Current cables for the electrical heater
2
Cooling water inlet
3
Cooling water outlet
4
Gas supply
5
Vacuum flange (DN16KF)
6
Tap holes for HTK 1200N Capillary Extension guiding
rods (optional)
The lid is made of nickel-plated brass and is water-
cooled. It is screwed to the housing and sealed with
an O-ring.
The lid contains connectors for the water supply, the
gas supply and the vacuum. The power supply for
the electrical heater is provided by two cables which
have to be connected to the CCU 1000.
The lid has two tap holes into which guiding rods are
screwed when the HTK 1200N is used with the Cap-
illary Extension (optional).
TIP: For more information about the connectors, re-
fer to chapter 4.
For more information about the HTK 1200N Capil-
lary Extension, refer to Appendix Eand to the
HTK 1200N Capillary Extension Instruction Manual.
NOTICE
Risk of damage
At the surface of the Kanthal heater an oxide
layer is formed which protects the wire.
After work in vacuum or inert gas, it is recom-
mended to regularly regenerate this oxide layer
by heating the HTK 1200N up to 1000 °C in air.
This will extend the life time of the heater consid-
erably.
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3
4
2
1
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