Peltier temperature-controlled cell holders/cell changers
Peltier temperature-controlled 8-cell changer
8.109)8.109(*
100
humidityrelative
R
1247.0
K
−ϑ+
⎟
⎠
⎞
⎜
⎝
⎛
=ϑ
K
- Dew-point temperature in °C
R
- Room temperature in °C
At a room temperature of 20°C and a relative humidity of 60%, the dew-point
temperature is 12°C. Condensation can be prevented by purging the sample
compartment with dry gas.
1. Thread a tube as thick as possible (inside diameter of at least 6 mm) through the
front duct provided for the drain tube into the sample compartment (Fig. 4-1 / 11,
p .4-1).
2. Lay the tube mouth in the middle of the front sample compartment wall. To prevent
instable temperatures, the gas must not be blown directly onto the cell changer.
3. Purge the sample compartment with 800 – 1000 l/h of dry gas, e.g. air, nitrogen or
argon.
Note
Before starting analyses at low temperatures, it is advisable to pre-dry the sample
compartment. Heat up the sample compartment by letting the Peltier temperature-
controlled cell changer operate for about ten minutes at +80°C.
Avoid opening the sample compartment unnecessarily long and thus the inflow of humid
room air, when running analyses at low temperatures.
13.4.5 Settings in WinASPECT
®
software
The cell changer is controlled by WinASPECT
®
software. On the Accessories tab of the
measurement parameter window, choose the 8-cell changer option.
Fig. 13-15 Options for Peltier temperature-controlled 8-cell changer for SPECORD
®
Option / button Description
First sample
Position of the first sample on the cell changer.
Last sample
Position of the last sample on the cell changer.
1
st
sample - reference
The sample placed on the 1
st
position selected above is
treated as reference.
In this case, it is not necessary to run the reference
measurement separately. The reference measurement will
be performed within the normal sample measurements.
Start manually
Before every measurement of a cell, a message box appears
“Start cycle [OK]“. The actual sample measurement is started
only after you confirmed this prompt.
This option may be used, for instance, for kinetic
88 User’s Manual SPECORD 200/205/210/250 – Accessories 07/2005
Analytik Jena AG
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