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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 69/197
• Alternating operation in the hyperoxic and hypoxic range or in the range from 20 vol.-% O
2
up to
22 vol.-% O
2
N
2
and O
2
are required for O
2
control. It is necessary to connect all gas supplies.
You can deactivate the O
2
and / or N
2
pressure alarm in the controller (chap. 7.3). Then also with
activated O
2
control no O
2
and / or N
2
pressure alarm will be emitted.
6.6.3 Operation without O
2
control
You can deactivate the O
2
control in the controller (chap. 6.7). With this setting, no O
2
and N
2
pressure
alarms and no O
2
tolerance range alarm will be issued. The zero-voltage relay alarm contact (chap. 11.6)
will also not be triggered.
Since neither nitrogen nor oxygen are required, it is not necessary to connect an O
2
or N
2
cylinder.
6.7 Activating / deactivating CO
2
, O
2
and humidity control
If CO
2
control and/or O
2
control (chamber with O
2
control) and/or humidity control (CBF / CBF-UL) shall not
be used, it is possible to deactivate them in the controller.
Press the Setpoint setting icon to access the “Setpoint” setting menu from Normal display.
“Setpoints” menu.
Select “Control on/off”.
You can turn on or off CO
2
control and O
2
control (chamber with O
2
control) and humidity
control (CBF / CBF-UL)
Mark / unmark the checkbox to activate /
deactivate the desired function and press the
Confirm icon.
When operating the chamber with deactivated CO
2
control, no CO
2
pressure alarm and no
CO
2
tolerance range alarm will be emitted.
Chamber with O
2
control: When operating the chamber with deactivated O
2
control, no O
2
and N
2
pressure alarms and no O
2
tolerance range alarm will be emitted.
CBF / CBF-UL: When operating the chamber with deactivated humidity control no humidity
tolerance range alarm will be emitted. The controller continues to show the actual humidity
value but no longer the humidity set-point.
When operating the CBF / CBF-UL with deactivated humidity control, humidification can be realized using
the Permadry™ water pan (chap. 6.8).
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