Test Chamber; Water Tank - Atlas XENOTEST BETA LM Operating Manual

Operating manual XENOTEST BETA LM
4.1.2 Test chamber (fig. 6)
The test chamber becomes accessible after un-
locking the test chamber door and swinging it to
the side. It is equipped with a safety switch allo-
wing to switch off the machine during a running
program.
This safety switch must be checked for its
perfect technical function within the deter-
mined inspection intervals, or at least once
a year.
Are located in the centre of the test chamber the
selected outer cylinder (1) with the three xenon
lamps (2) and the filter lantern (3).
The 16 sample holders (4) are latched into the
two carousel racks (5) and during operation rota-
ted around the lamps and the filter lantern.
Test chamber and xenon lamps are supplied by
separate air flows. A uniform air ventilation over the
specimen surface is achieved by an appropriate air-
flow above and below the specimen carousel (fig.
10 ventilation scheme). At the bottom rear of the
test chamber two connection hoses are provided
which supply the two humidifiers with air. The ma-
ximum chamber humdidity can be adjusted up to
95% r.h. depending on the preset temperature.
The rain bars (6) mounted in the test chamber
spray ulra-pure water in cyclical intervals and with-
out any pressure from the water tank on to the spe-
cimens (7). The bars can be withdrawn from the
test chamber by pressing on the unlocking base
(8) at the bottom end of the rain bar. A so-called
XENOSENSIV sensor (9) is installed on a samp-
le holder by means of a special adapter to measu-
re the irradiance in the range between 300-400nm
and the black standard temperature in the surface
temperature range up to 130°C. If no sensor is used
the end plug must be fitted.
A sensor is mounted in the upper rear part of the
test chamber which measures the test chamber
temperature and the relative humidity. The sensors
combined with the program control guarantee con-
trol of constant setting values.
XENOTEST BETA
Safety hints
Program example on
Function
XENOTEST BETA
Page 16
Unit set-up
Features
Test set-up
To clean the test chamber the specimen carousel
(10) is disassembled. For this, the 4 securing
screws of the top and bottom carousel rack (11/
12) are removed and the racks are placed on the
test chamber bottom. Unscrew the 4 securing
screws (13) of the four carousel bows (14) and
remove the bows from the test chamber. Finally
remove the two air routing plates (15) from the

test chamber.

4.1.3 Water tank (fig. 5)
The water tank is placed in the bottom part of the
apparatus and provides for the supply with ultra-
pure water for the humidity and rain functions (see
fig. 11 water circuits).
Figure 5: Water tank
3 2
4
1 Tank cover
2 Aperture for hose connections
3 Inlet socket
4 Outlet socket
5 Water level indicator
Water quality
The water quality must be of high-grade purity to
prevent deposits building up on the optical
filter system, the internal walls and the
samples. Deposits will alter the exposure
results. The use of ion exchange cartrid-
ges alone is not sufficient.
Regarding the water purity we refer to the mini-
mum requirements of some important standards,
such as DIN 53387 „Light exposure and weathe-
ring of plastics":
1. Electrical conductivity: < 5 µS/cm
2. PH value: 6-8
3. Content of solid bodies < 1 ppm measured
as silicon dioxide
Options and accessory
Unit description
of the XENOTEST BETA
Care and cleaning Maintenance
ATLAS
1
5
Start-up
List of options
and accessories