6 Operation
30
C58IB004EN-D
tion device you should have
- a valve to close the vacuum pump
- a valve to vent the DHS 1100 sample stage
- a pressure gauge.
3. To apply vacuum, close the venting valve and
open the valve to the vacuum pump.
6.5.2.4 Reactive, Explosive, and Poisonous Gases
6.5.3 Setting the Sample Temperature and
Heating Rate
Sample temperature and heating/cooling rate are
controlled by the CCU 100 Combined Control Unit.
There are two ways of defining the desired sample
temperature and heating/cooling rate:
1. Sample temperature and heating/cooling rate
can be set manually by using the keypad on the
front panel of the CCU 100. Refer to the
CCU 100 Instruction Manual
for detailed infor-
mation.
2. Sample temperature and heating/cooling rate
can be defined in the diffractometer control soft-
ware. Refer to the
Diffractometer Instruction
Manual
for detailed information.
The
maximum heating and cooling rate
which
can be set in the CCU 100 (parameter SPR) is
300 °C/min. Be aware that this is not the maximum
heating or cooling rate for the sample plate which
you can actually achieve with the instrument. The
achievable heating and cooling rates for the sample
plate depend on the operating conditions (gas type,
temperature range). Information about the physical
range of heating and cooling rates is given in the ref-
erence guide C58IB002EN.
Temperature control
of CCU 100 has been opti-
mized in such a way that it can be used for all spec-
ified sample environments without any adjustments
to the internal control parameters. Due to the differ-
ent thermal properties of the specified gases, a tem-
perature overshoot of a few °C may occur under
certain operating conditions. The temperature over-
shoot can be reduced by reducing the heating rate.
6.5.4 Recording the X-ray Scan
Before you start the scan make sure that the con-
nector on the turnable cooling ring does not block
the incident or diffracted beam.
Refer to the
Diffractometer Instruction Manual
for in-
formation about recording an X-ray scan.
CAUTION
Be aware that it takes some time until the vac-
uum is good enough for the measurement
(approx. 15 min for 6x10
-1
mbar with a pump
with 4.2 m
3
/h capacity).
NOTICE
Anton Paar GmbH offers a suitable vacuum
equipment for the DHS 1100. All required com-
ponents for the installation are included in the
delivery. Please refer to the reference guide
C58IB002EN.
WARNING
Do
not
operate the DHS 1100 with reactive,
explosive or poisonous gases or with gases
which form explosive mixtures with air.
In particular, do
not
operate DHS 1100 with
hydrogen.
