Technical information

45
1 Terminology/Symbols
III Uwatec
®
Aladin
®
Air Z O
2
III
ppO
2
max Maximum allowable partial pressure of oxygen: The higher the portion
of oxygen in the used mixture, the smaller the dive depth at which the tolera-
ble partial pressure of oxygen (ppO
2
max) is reached. Default setting is a limit
of 1.5 bar, it can be changed with the DataTalk-program in the range of 1.2 to
1.95 bar. The Aladin
®
Air Z O
2
does not display the entered ppO
2
limit, but
warns the diver acoustically and optically if he reaches the depth at which the
ppO
2
limit is reached.
The CNS O
2
%-value/alarm is not influenced by the selected ppO
2
max.-setting.
<CNS O
2
LIMIT> Oxygen toxicity: With the increased por-
tion of oxygen, the oxygen in the tissues,
especially in the central nervous system
(CNS) becomes important. If the partial
pressure of oxygen rises above 0.5 bar,
the CNS O
2
value increases, if the partial
pressure of oxygen is below 0.5 bar, the
CNS O
2
value decreases. The closer the
CNS O
2
value comes to 100%, the nearer
comes the limit, where symptoms can
occur. See page 47 and 50.
Nitrox diving and diving with a semi-closed rebreather may only be attemp-
ted by experienced divers with special training.
CNS O
2
%
increases
ppO
2
0,5 bar
CNS O
2
%
decreases
0,21 bar
WARNING