25
5.5
HUMIDIFICATION SYSTEM
NB: only for machines equipped with this device
5.8
PROBES
2
Dry bulb probe
3
Wet bulb probe
(only climatic chambers)
This probe is equipped with gauze
the end of which remains constantly
immersed in demineralized water
• Both probes measure the temperature.
• Relative humidity is measured by the
psychometric system.
• For further information please refer to the
chapter entitled “MAINTENANCE”
5.7
INTERNAL LIGHT
The internal light 19 is lit by pushing button 3 (fig. 8) on the
control panel.
5.8
5.9
CH0305-F08
CH0305-F09
5.6
HEATING SYSTEM
Heating is obtained by means of low thermal inertia, stainless steel, electric immersion heaters placed on the internal
air recirculation circuit.
Humidification is obtained by directly introducing steam
into the chamber.
Water can be used from the mains supply; in fact, the
machine has its own water- softening system incorpo-
rated.
The direct humidification system uses a special steam
generator which introduces steam from heated water,
without the risk of dripping inside the chamber.
This direct system has an extremely low response time
which enables humidity to be varied very quickly.
This is all controlled by a regulator which considers that the
percentage of water contained in the air is a non-linear
temperature function.
Measurement of relative humidity is based on a psycho-
metric system (dry bulb, wet bulb).
The computer notes the dry bulb and wet bulb temperature
values and calculates the relative humidity and other
parameters necessary for adjustment.
A water storage tank is included in the humidification
system in the CHALLENGE chambers in order to give a
high level of autonomy during climatic tests even when the
chamber is not connected to the mains supply.
lamp
19
2
3