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Operating Manual Xenotest
®
440
Inhalt/Content/Sommaire
5.8
Sample spraying
The sample spraying of the Xenotest
®
440 enables
spraying of the samples with the processed water during
a wet cycle.
Fig. 17:
The humidifier as well as the sample spraying are fed
from a water tank
1
inside the instrument. The filling
level of the water tank is monitored by a floating switch
4
. A magnetic switch
3
reports a low water fill level to
the program control panel.
The following pumps are installed:
• The immersion pump
2
which supplies the humidi-
fier
5
with water for air humidification.
• The spray rod
7
supplies water from the water tank
into the spray lance
8
for spraying the samples.
Draining water is fed into the water tank or into a gravity
drain through the return pipe
6
.
NOTE – Fresh water operation
The purity of the water is an important criterion for the
test. Therefore, it is recommended that the return line
6
is connected to the laboratory drain (gravity drain) if the
samples give off particles in the test with spraying.
The water tank inside the instrument is then constantly
supplied with fresh, processed water by a water treat-
ment system or from an external tank.
Weathering tests of materials which release chlorine or
reactive chlorine compounds during weathering tests
or extract with spray water should only be conducted in
fresh water operation. In this case, the return pipe
6
must be connected to a laboratory drain!
1
2
6
5
4
3
7
8
Fig. 17
5
Functional description
