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45
1 Terminology/Symbols
III Uwatec
®
Aladin
®
Air Z O
2
English
III
ppO
2
max
Maximum allowable partial pressure of oxygen: The higher the percen-
tage of oxygen in the used mixture, the smaller the dive depth at which the
tolerable 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 per-
centage 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 symp-
toms 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
/depth
0,5 bar
CNS O
2
%
decreases
0,21 bar