Memmert HPP 108/749 Constant climate chamber (Generation 2003) - Manual (Page 10)

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Design and description
2.2 Description
The constant climate chamber can heat the interior up to 70 ºC and cool it down to 5ºC. For
this purpose, low-noise, long-life and energy-saving Peltier cooling and heating technology is
used. In heating operation, a part of the required energy is extracted from the surroundings
(heat pump principle).
Humidity in the interior can be regulated between 10 and 90 % rh (rh = relative humidity).
The humidity is increased by water from a tank being evaporated and fed into the interior,
and is reduced through condensation on a Peltier module.
2.3 Working range
The temperature-humidity diagram ( Fig. 3 ) specifies at what range of temperature and humid-
ity a permanent, condensation-free operation is possible.
Caution:
If the appliance is in operation at the upper level or outside the working range for long
periods, puddles of water may form inside the chamber and water may force its way out
of the door seal.
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
Temperature °C
Humidity % rH
C
A
B
Fig. 3 Temperature-humidity working range