Operating Manual Xenotest
®
220/220+
- 26 -
5
Functional description
5.5 Ventilation system
The Xenotest 220/220+ is an air-cooled instrument. The
cooling system uses two different air sources.
• Air flow system for the lamp cooling
• Air flow system for the test chamber cooling
5.5.1 Lamp cooling
Fig. 16:
The cooling air for lamp cooling is brought in by a fan and
enters through the air vents
3
on the right hand side of
the instrument. The air current flows along the right hand
module shaft and cools the electronic components first.
The air is then fed through the outer cylinder
2
and cools
the xenon lamp. The heated cooling air passes through
the air opening on the top of the instrument
1
and is ex-
hausted by a technical ventilation system or discharged
directly to the outside air.
CAUTION – overheating!
If the exhaust air current impairs the cooling of the
lamp, the instrument may overheat and cause damage
to the samples. The exhaust at the top of the instru-
ment must always be kept clear!
5.5.2 Test chamber cooling
Fig. 17:
The cooling air
1
for cooling the test chamber is brought
in by the fan
9
at the air inlet opening
7
though the air
filter
8
. Depending on the temperature preset in the test
chamber, the volume of cooling air is controlled by a motor-
driven vent
6
. The air is fed past the heating system
B
where it is heated to the necessary temperature, then
mixed with humid air in the humidity system
C
according
to the preselected values and fed in through the air shaft
on the rear wall of the test chamber
4
.
The air is distributed evenly over the sample rack
3
and
the temperature and humidity are measured continuously
by the integrated sensor system
2
. The used air
A
is
passed through the air outlet
5
in the front left section
of the test chamber and, together with the heated cooling
air of the lamp cooling, is either exhausted by a technical
ventilation system or discharged directly into the outside air.
3
2
1
ATLAS
ESCAPE
ENTER
2
Start
Stop
3
1
5
6
4
8
9
7
0
B
9
8
7
A
5
6
C
1
2
3
4
Fig. 16
Fig. 17
