Uwatec Aladin 2G User Manual download pdf (Page 18)

1.3 Nitrox information (O

information)

For dives with compressed air in normal recreational diving, nitrogen is the decisive gas for the decom-

pression 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 max depth. Aladin includes

this in the calculations and displays the necessary information:

% mix Fraction of oxygen: The fraction of oxygen in the Nitrox mixture can be set

between 21% (normal compressed air) and 100% in 1% increments. Your

selected mix will be the basis for all calculations.

ppO

max Maximum allowed partial pressure of oxygen: the higher the fraction of oxygen

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

max is reached is

called Maximum Operating Depth (MOD).

When you enter the settings for the gas mixture, Aladin will display the

ppO

max limit setting and the cor

responding MOD. Aladin warns you audibly

and visually once the depth is reached at which the ppO

reaches the maxi-

mum allowed value ->25.

•

Default setting of

ppO

max

is 1.4bar.

The value of

ppO

max can be set by means of SmartTRAK or with

set 1

between

1.2 and 1.6bar (->46). It can also be changed at the time of setting the gas mixture

(->20).

• The CNS O

% value/alarm is not influenced by the selected ppO

max setting.

CNS O

% 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 0.5bar, the CNS O

value increases,

if the partial pressure of oxygen is below 0.5bar, the CNS O

value decreases.

The closer the CNS O

value is to 100%, the closer the limit where symptoms

of oxygen toxicity can occur.

Nitrox diving may only be attempted by experienced divers after proper training

from an internationally recognized agency.

1 Terminology / Symbols

III UWATEC Aladin TEC 2G

CNS O

increases

ppO

Depth

at which ppO

reaches 0.5bar

for three

commonly

used mixes

0.5bar

21% 13m (43ft)

32% 6m (20ft)

36% 4m (13ft)

CNS O

decreases

0.21bar

WARNING

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Uwatec Aladin 2G User Manual Page 18

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