Operating Manual Xenotest
®
440
- 46 -
Inhalt/Content/Sommaire
7.3
Setting the test chamber humidity
The desired humidity in the test chamber is entered as
a parameter on the instrument control panel. The maxi-
mum humidity which can actually be achieved in the test
chamber depends on the ambient conditions. In addi-
tion, the amount of humidity which must be introduced
into the test chamber by the humidifier has an influence
on the maximum temperature which can be reached
in the test chamber. Under dry ambient conditions, the
maximum settable sample chamber temperature in the
device may not be reachable.
Fig. 40:
The diagram shows the maximum achievable sample
chamber humidity at a given sample chamber tempera-
ture under dry laboratory conditions, i.e. 20 °C and ap
-
prox. 30% relative humidity, with closed air vent. With
the air vent open, the achievable humidities are lower
and highly dependent upon the ambient laboratory con-
ditions.
7.4
Temperature fields
Fig. 41:
The diagram shows the ΔT temperature fields for
XENOCHROME
®
320 and daylight B04 depending on
the irradiance. The black standard temperature (BST)
is regulated by the fan speed and dependent upon the
irradiance, test chamber temperature and the selected
filter system. The setting range for the fan speed is be-
tween 500 and 2,500 rpm. Minimum ΔT values are pos
-
sible at maximum fan speed and maximum ΔT values at
minimum fan speed. Tolerances are possible within the
temperature fields shown in Fig. 41.
Fig. 40
Fig. 41
20
30
40
50
60
70
0
10
20
30
40
50
60
70
80
90
100
800 RPM
2500 RPM
flap closed
Chamber temperature CHT/°C
Rel. Humidity/ %
T=
/°
C
BST
-PR
T
20
40
60
80
100
120
140
5
10
15
20
25
30
35
40
45
50
55
60
65
500 RPM
XENOCHROME 320
2500 RPM
Daylight B04
Irradiance E
300-400
/ W/m
2
7
Operation
