SubGear XP-3G - 3.1.3 Nitrox Information

22
Diving with Subgear XP-3G
3.1.2 Display during decompression phase
Total ascent time to surface (7min)
6m
35.7m
Decompression rangeNo-stop range
3m
Time
Depth
Decompression
stop depth
Deepest stage is
displayed.
Decompression stop
duration
Prescribed duration of the
decompression stop at the
displayed decompression
stage (minutes).
Total ascent time
Including decompression
stops in minutes.
Decompression stop
All required decompression
stops must be observed.
Deepest
decompression
stop depth
2min
Decompression
stop duration
STOP
NO
DECO
CNS O
2
%
DEPTH
DIVE TIME
CCR: SP ppO2 x100
(until CNS O2% >50%)
70 = 0.70 bar
130 = 1.30 bar
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. Subgear XP-3G 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, Subgear XP-3G will display the ppO
2
max
limit setting and the corresponding MOD. Subgear XP-3G warns you audibly and visually
once the depth is reached at which the ppO
2
reaches the maximum allowed value ->30.
NOTE:
•DefaultsettingofppO
2
max is 1.4bar.
The value of ppO
2
max can be set by means of Dive.Log or with “set 1” between 1.2
and 1.6bar (->86). It can also be changed at the time of setting the gas mixture
(->24).
• 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