- 27 -
Operating Manual Xenotest
®
220/220+
5
Functional description
5.6 Humidity function
The humidity function of the Xenotest 220/220+ enables
samples to be tested under controlled humidity conditions.
• The setting range for the relative humidity during an
exposure cycle is 20% to 85%. The humidification
of the test chamber is generated by an aerosol-free
ultrasonic humidifier.
Fig. 18:
The humidity system is fed from a water tank
1
inside
the instrument. The fill level of the water tank is monitored
by a float valve
4
. A magnetic switch
3
reports the fill
level to the program control. There is an immersion pump
2
in the water tank which supplies the humidifier
5
with
water for air humidification. Water flows back into the tank
via return tubes
6
.
1
2
6
5
4
3
Fig. 18
