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1.3 Nitrox information (O
2
information)
For dives with compressed air in normal recreational diving, nitrogen is the decisive gas for the decompres
-
sion calculations. When diving with Nitrox, the risk of oxygen toxicity rises with the increase of the fraction
of oxygen and the increase of depth and can limit dive time and the maximum depth. Aladin
®
ONE includes
this in the calculations and displays the necessary information:
<O
2
% MIX> Fraction of oxygen: The fraction of oxygen in the Nitrox mixture can be set
with SmartTRAK between 21% (normal compressed air) and 50% in 1% incre
-
ments. Your selected mix will be the basis for all calculations.
ppO
2 max.
Maximum allowed partial pressure of oxygen: the higher the fraction of oxy-
gen in the mixture, the shallower the dive depth at which this value of the
partial pressure of oxygen is reached. The depth at which ppO
2
max. is reached
is called Maximum Operating Depth (MOD).
When you enter the settings for the gas mixture with
SmartTRAK, SmartTRAK
will display
the cor
responding MOD. Aladin
®
ONE
warns the diver
visually once
the depth is reached at which the ppO
2
reaches the maximum allowed value
->15.
The setting of ppO
2
max. is 1.4 bar.
<CNS O
2
> Oxygen toxicity: With the increased percentage 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 is to 100%, the closer the limit where symptoms
can occur ->15.
Nitrox diving may only be attempted by experienced divers after proper training
from an internationally recognized agency.
10
1 Terminology / Symbols
III UWATEC
®
Aladin
®
ONE
CNS O
2
%
increases
ppO
2
Depth
at which ppO
2
reaches 0.5 bar
for three typical mixes
0.5 bar
21% 13m (43ft)
32% 6m (20ft)
36% 4m (13ft)
CNS O
2
%
decreases
0.21 bar
WARNING
10


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