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KBF / KBF-UL + KMF (E6) 04/2020 page 113/163
17. Humidification / dehumidification system
The chamber is equipped with a capacitive humidity sensor. This results in a control accuracy of up to +/-
3 % r.h. of the set point. The temperature-humidity diagrams (Figure 19) show the possible working rang-
es for humidity.
• In the “setpoints” menu you can turn humidity control (humidification and dehumidification) on or off
with the setting “Control on/off” (chap. 6.3).
With humidity control turned off, the humidification module cools down. After activation it will take up to
20 minutes until the humidification function is fully available again. This setting is required when
operating the chamber without a water connection in order to avoid humidity alarms.
• Operation line “Humidity off” serves to turn off the humidification / dehumidification system in Fixed
value operation (chap. 7.3, time program operation (chap. 9.7.3) and week program operation (chap.
10.6.5). This allows configuring the disconnection for individual program sections.
When the humidification / dehumidification system is turned off via operation line it remain on standby
(filled and heated). Therefore it is immediately available after turning on.
The preset temperature and humidity values should be situated within the optimum range
(hatched range in Figure 19).Only within this area will the chamber not be exposed to exces-
sive moisture due to condensation.
In the short-term set points outside the optimum range can also be targeted. The control accu-
racies of +/- 3 % r.h., however, cannot be guaranteed in this case.
KMF: When operating the chamber with activated humidity, humidity control turns off automatically at
temperature set-points below 0 °C / 32 °F or above 95 °C / 203 °F. The information icon Humidity off is
displayed in the screen header in Normal display. When the temperature setpoint is set back to the range
from 0 °C / 32 °F to 95 °C / 203 °F, humidity control turns on again and the information icon Humidity off
disappears.
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KBF / KBF-UL temperature-humidity diagram
KMF temperature-humidity diagram
Figure 19: Temperature-humidity diagrams
Range A: Control range of temperature and relative humidity, condensation free range
Range B: Discontinuous range (no continuous operation, up to 24 h)
Range C: In this range, condensation in the inner chamber is possible
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