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CB / CB-UL, CBF / CBF-UL (E7) 07/2021 Page 68/197
6.5 Operating the DuoDoor™ door lock
WARNING
Magnets can affect the function of pacemakers and implanted defibrillators.
A pacemaker can be put into test mode and cause discomfort. A defibrillator may
not work anymore.
If you wear such devices, maintain a sufficient safety distance to the chamber door in the
area of the door handle.
Warn wearers of such devices of approaching the chamber door.
The DuoDoor™ door lock offers two different ways to open the doors, dependent on the glass door lock
position.
Opening outer door and glass door independently
When closing the glass door, close the glass door lock.
Then you can close and open the outer door using its handle.
The glass door will remain closed until you manually open the
glass door lock.
Figure 27: Closed position
Opening outer door and glass together
When closing the glass door leave the glass door lock in open
position. Then close the outer door. The glass door is pressed
against the gasket so that both doors are securely closed.
When opening the outer door, a magnetic device also opens the
glass door.
Figure 28: Open position
6.6 Required gas supply for the chamber with O
2
control
In the chamber with O
2
control, cell growth can be additionally influenced by a variable oxygen content.
Depending on the required range of O
2
concentration, the type of gas which is required may vary. To this
end, two equipment variants are available:
6.6.1 Hypoxic control range 0.2 vol.-% up to 20 vol.- % O
2
(regular)
In addition to the CO
2
connection, the chamber provides a gas connection for N
2
.
As compared to the ambient air (O
2
concentration of 20.9 vol.-%) only the N
2
concentration needs to be
increased, no oxygen is required for the O
2
control. Therefore, it is not necessary and possible to connect
an O
2
cylinder. Even with activated O
2
control no O
2
pressure alarm will be emitted.
6.6.2 Alternative control range 10 vol.-% up to 95 vol.-% (option)
In addition to the CO
2
connection, the chamber provides gas connections for O
2
and N
2
.
• Operation in the hyperoxic range (> 22 vol.-% O
2
)
As compared to the ambient air (O
2
concentration of 20.9 vol.-%) only the O
2
concentration needs to be
increased, no nitrogen is required for the O
2
control. Therefore, it is not necessary to connect a N
2
cylinder.
You can deactivate the N
2
pressure alarm in the controller (chap. 7.3). Then also with activated O
2
control no N
2
pressure alarm will be emitted.
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