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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 137/197
17. CBF / CBF-UL: Humidification 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.
You can turn humidity control on or off in the controller (chap. 6.7).
With humidity control turned off, the humidification module cools down. After activation it will take up to 10
minutes until the humidification function is fully available again. This setting is required when operating the
chamber with the Permadry water pan in order to avoid humidity alarms.
Heat emission of electrical devices connected inside the chamber may modify the
temperature and humidity range.
The chambers are equipped with a door heating system to avoid condensation in the door area.
17.1 Function of the humidifying system
The humidifying system is located in the humidity generation module. In a cylindrical container with a
volume of approx. 0,07 liters an electrical resistance heating evaporates water. The water content is kept
close to the boiling point, and thus steam can be immediately generated in sufficient quantity for rapid
humidity increases or for compensation of humidity losses, e.g. by door openings.
Freshwater is supplied by manually filling a freshwater bag. A peristaltic pump transports the water to the
humidification module via a silicone tube.
In order to ensure accurate humidifying, observe the following points with regard to
the freshwater supply:
• Water type: deionized (demineralized) water
• To ensure humidification during 24 hours even at high humidity set-points, we recommend
filling the freshwater bag at the end of each day.
• Water intake temperature NOT below +5 °C / 41 °F and not exceeding 40 °C / 104 °F.
BINDER GmbH is NOT responsible for the water quality provided by the customer.
Any problems and malfunctions that might arise following use of water of deviating quality is
excluded from liability by BINDER GmbH.
The humidity system is functional only if the freshwater bag is sufficiently filled. Check the filling level daily.
The water reserve is sufficient for one up to two weeks, depending on the humidity demand (set humidity
set-point, number of door openings).
For error indications concerning water supply and humidity system, see chap. 11 and 22.6.
When entering a humidity setpoint value > 90 %
r.h. a message window appears, indicating that
condensation is possible.
Press the Confirm icon.
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