III Diving with Aladin
®
Pro Nitrox
30
1.3 Nitrox information (O
2
information)
For dives with compressed air in normal recreational diving nitrogen is the decisive gas for the decompression
calculations. When diving with nitrox, the toxicity of oxygen rises with the increase of the portion of oxygen
and increasing depth and can limit dive time. Aladin
®
Pro Nitrox includes this in the calculations and displays
the necessary information:
<O
2
% MIX>
Percentage of oxygen: The percentage of oxygen in the Nitrox mixture can be set
between 21% (normal compressed air) and 50%.
ppO
2
max
Partial pressure of oxygen: The higher the percentage of oxygen in the used mixture,
the smaller the dive depth at which the tolerable partial pressure of oxygen (ppO
2
max) is reached. Aladin
®
Pro Nitrox does not display the value, but warns the diver
when he reaches the tolerable maximum depth.
<CNS O
2
LIMIT>
Oxygen toxicity: With the increased percentage of oxygen, the oxygen in the tissues,
especially in the central nervous system (CNS) becomes important for the
decompression calculations. If the partial pressure of oxygen rises above 0.5 bar, the
tissues begin to saturate with O
2
.
1 Terminology/Symbols
