SCUBAPRO-UWATEC ALADIN TEC 2G, User Manual

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20
3. Diving with Aladin 2G
SCUBAPRO ALADIN 2G
3.1.3 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 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 2G 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 between 21% (normal compressed
air) and 100% in 1% increments. Your
selected mix will be the basis for all
calculations.
ppO
2
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
2
max is reached is
called Maximum Operating Depth (MOD).
When you enter the settings for the gas
mixture, Aladin 2G will display the ppO
2
max
limit setting and the corresponding MOD.
Aladin 2G warns you audibly and visually
once the depth is reached at which the
ppO
2
reaches the maximum allowed value
->25.
)
NOTE:
• Default setting of ppO
2
max is 1.4bar.
The value of ppO
2
max can be set
by means of SmartTRAK or with “set
1” between 1.2 and 1.6bar (->59). It
can also be changed at the time of
setting the gas mixture (->21).
• The CNS O
2
% value/alarm is not
influenced by the selected ppO
2
max
setting.
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 0.5bar, the CNS O
2
value
increases, if the partial pressure of oxygen is
below 0.5bar, the CNS O
2
value decreases.
The closer the CNS O
2
value is to 100%,
the closer the limit where symptoms of
oxygen toxicity can occur.
Depth
at which ppO
2
reaches 0.5bar
for three
commonly
used mixes
21% 13m (43ft)
32% 6m (20ft)
36% 4m (13ft)
ppO
2
0.21bar
0.5bar
CNSO
2
%
decreases
CNSO
2
%
increases
WARNING
Nitrox diving may only be attempted by
experienced divers after proper training from
an internationally recognized agency.
3.2 Attention messages and
alarms
Aladin 2G draws the diver’s attention to
certain situations and warns the diver
of unsafe diving practices. Attention
messages and alarms are visual and / or
audible.
)
NOTE:
• The audible attention messages
can be switched off in “set 1” ->58 or
SmartTRAK. With SmartTRAK they
can be switched off selectively.
• In addition, the sound can be turned
off completely in “set 2” ->65.
WARNING
If you turn off the sound you will have no
audible warnings. Without audible warnings
you could inadvertently get into potentially
hazardous situations which could result in
death or serious injury.