Operating Manual Xenotest
®
220/220+
- 28 -
5
Functional description
5.7 Sample spraying
The sample spraying of the Xenotest 220/220+ enables
spraying of the samples with the processed water during
a wet cycle.
Fig. 19:
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
humidifier
5
with water for air humidification.
• The pump
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
If the samples give off particles in the raining test but the
purity of the water is an important criterion for the test,
the return pipe
6
can be connected to the laboratory
drain (gravity drain).
The water tank inside the instrument is then constantly
supplied with fresh, processed water by a water treatment
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 may only be conducted in fresh
water operation. The return pipe
6
must be connected
to a laboratory drain in this case!
1
2
6
5
4
3
7
8
Fig. 19
