- 25 -
Operating Manual Xenotest
®
440
Inhalt/Content/Sommaire
5.6
Ventilation system
The Xenotest
®
440 is an air-cooled instrument. The cool
-
ing system uses two different air sources.
• Air flow system for the lamp cooling
• Air flow system for the test chamber cooling
5.6.1 Lamp cooling
Fig. 14:
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 com-
ponents first. The air is then fed through the outer cylin-
der
2
and cools the xenon lamps. The heated cooling
air emerges from the air vent on the top of device
1
and must be extracted by a separate exhaust system
(see 3.3).
CAUTION – overheating!
If the exhaust air current impairs the cool-
ing of the lamp, the instrument may over-
heat and cause damage to the samples.
The exhaust at the top of the instrument
must always be kept clear!
5.6.2 Test chamber cooling
Fig. 15:
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
motordriven vent
6
. The air is fed past the heating sys-
tem
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 continuous-
ly by the integrated sensor system
2
. The used air
A
is passed through the air outlet
5
in the front left sec-
tion 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
B
9
8
7
A
5
6
C
1
2
3
4
Fig. 14
Fig. 15
5
Functional description
