Uwatec Aladin H, User Manual

Page: 15 / 64

15
English
ALADIN H USER MANUAL
No-stop phase
Dive phase during which surfacing is
allowed without stop.
Decompression phase
Dive phase during
which surfacing is
allowed only after
decompression stops
are completed.
Time
Current depth
24min
No-stop time
26.2m Max depth
37min dive time
Elapsed bottom time
Depth
3.1.2 Display during
decompression phase
DECOMPRESSION
SYMBOL
(Stops required)
DECOMPRESSION
DURATION
(in minutes at the
stop depth)
DECOMPRESSION
STOP DEPTH
(deepest stage shown)
O
2
MIX
(Until
CNS% = 50%)
CNS% (After
CNS% > 50%)
ASCENT RATE
(During ascent)
TOTAL ASCENT
TIME
(In minutes
including
decompression
stops)
TANK PRESSURE
+ ALTERNATE DISPLAYS
(select by right button press)
Total ascent time to surface (7min)
Time
35.7m
No-stop range Decompression range
Deepest
decompression
stop depth
2min
Decompression
stop duration
6m
3m
Depth
3.1.3 Nitrox information
(O
2
information)
For dives with compressed air in normal
recreational diving, nitrogen is the decisive
gas for 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; this can
limit dive time and max depth. The Aladin H
includes this in its 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 the ppO
2
max is reached
is called Maximum Operating Depth (MOD).
When you enter the settings for the gas
mixture, the Aladin H will display the
ppO
2
maximum limit setting and the
corresponding MOD. The Aladin H warns
you audibly and visually once the depth
is reached at which the ppO
2
reaches the
maximum allowed value.
F
NOTE: The default setting of ppO
2
max is 1.4bar. The value of ppO
2
max can be set between 1.0bar and
1.6bar at the gas settings. It can also
be changed to “off” (--) which requires
Code 313. 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.
During the dive, the depth at which ppO
2
reaches 0.5bar with various commonly-
used mixes is as follows:
MIX DEPTH in
meters
DEPTH in
feet
21% 13m 43ft
32% 6m 20ft
36% 4m 13ft