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LUNA 2.0 AI USER MANUAL
3 .17 Altitude diving
3 .17 .1 Altitude warning after a dive
Climbing to altitude is similar to starting an ascent from a dive: you expose your body to a lower partial pressure
of nitrogen, and you start off-gassing. After a dive, given the higher nitrogen loading in your body, even reaching
an otherwise negligible altitude can potentially cause decompression sickness. Consequently, the LUNA 2.0 AI
constantly monitors the ambient pressure and uses it to evaluate your nitrogen loading and off-gassing. If the LUNA
2.0 AI notices a drop in ambient pressure not compatible with your current nitrogen loading, it will activate a warning
(altitude symbol starts blinking) to alert you of a potentially dangerous situation.
The LUNA 2.0 AI counts down remaining saturation and indicates this on the current dive settings screen with the
no-y time until the available saturation is no longer dangerous during a ight or when crossing over a mountain
pass.
The allowable altitude (beyond which the LUNA 2.0 AI has computed to be incompatible with your current nitrogen
saturation levels) is displayed below the no-y time and the surface interval. Refer to chapter Reading the altitude,
barometric and temperature values for more information.
3 .17 .2 Altitude and the decompression algorithm
Atmospheric pressure is a function of altitude and weather conditions. This is an important aspect to consider
for diving because the surrounding atmospheric pressure has an inuence on the on-gassing and off-gassing of
nitrogen in your body. The LUNA 2.0 AI divides the possible altitude range into 5 classes that are illustrated in the
picture below:
Elevation
Barometric
switch point
Dive mode
Altitude classes
C0
C1
C2
C3
C4
4000 m
13120 ft
3000 m
9840 ft
2000 m
6560 ft
1000 m
3280 ft
0 m
0 ft
610 mbar
8.85 psi
725 mbar
10.51 psi
815 mbar
11.82 psi
905 mbar
13.13 psi
GAUGE
SCUBA
SCUBA
SCUBA
SCUBA
Altitude classes Elevation
Barometric
switch point
GAUGE610 mbar
8.85 psi
4000 m
13120 ft
SCUBA725 mbar
10.51 psi
3000 m
9840 ft
SCUBA815 mbar
11.82 psi
2000 m
6560 ft
SCUBA905 mbar
13.13 psi
1000 m
3280 ft
0 m
0 ft
SCUBA
Dive mode
The altitude classes are approximate elevations because the effect of weather conditions can make the switch point
pressure occur at different levels.
WARNING
At the altitude class 4 or higher the LUNA 2.0 AI operates in GAUGE mode only (the mode will switch automatically).
F
NOTE: You can check your current altitude class and elevation in the Altimtr menu.
F
NOTE: The LUNA 2.0 AI deals with altitude automatically - it monitors the atmospheric pressure every 60
seconds and if it detects a sufcient drop in pressure, it does the following: it indicates the new altitude range
and, if applicable, the prohibited altitude range; it indicates the desaturation time, which in this case is an
adaptation time to the new ambient pressure. If a dive is started during this adaptation time, the LUNA 2.0 AI
considers it a repetitive dive since the body has residual nitrogen.
F
NOTE: A fast descent from mountains or a fast rise in airplane cabin pressure may activate the dive mode.
The LUNA 2.0 AI will automatically detect and end this “dive” after 12 hours, or you may manually end it by a
long-press of both pushbuttons at the same time. This kind of false dive will not be stored in the LUNA 2.0 AI’s
logbook.
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