Nitrox Information (O Information); Attention Messages And Alarms; Attention Messages - Uwatec Aladin ONE Matrix User Manual

Time
35.7m
No-stop range
3.1.3 Nitrox information
(O
2
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
One includes this in its calculations and
displays the necessary information:
O % mix Fraction of oxygen: The fraction
2
of oxygen in the nitrox mixture can be set
between 21% (normal compressed air) and
50% in 1% increments. Your selected mix
will be the basis for all calculations.
ppO max Maximum allowed partial
2
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
is called Maximum Operating Depth (MOD).
When you enter the settings for the gas
mixture, the Aladin One will display the
ppO maximum limit setting and the
2
corresponding MOD. The Aladin One warns
you audibly and visually once the depth,
at which the ppO
allowed value, is reached.
F
NOTE: The default setting of ppO
is 1.4bar. The value of ppO
be set between 1.0bar and 1.6bar at
the gas settings. The CNS O
alarm is not influenced by the selected
ppO max setting.
2
CNS O % Oxygen toxicity: With the
2
increased percentage of oxygen, the
oxygen in the tissues, especially in the
central nervous system (CNS), becomes
12
Total ascent time to surface (7min)
3m
Deepest
6m
decompression
stop depth
2min
Decompression
stop duration
Decompression range
information)
max is reached
2
reaches the maximum
2
max can
2
% value/
2
important. If the partial pressure of oxygen
rises above 0.5bar, the CNS O
increases; if the partial pressure of oxygen is
below 0.5bar, the CNS O
The closer the CNS O
the closer the limit where symptoms of
oxygen toxicity can occur.
During the dive, the depth at which ppO
reaches 0.5bar with various commonly-
used mixes is as follows:
MIX
21%
32%
36%
Nitrox diving should only be attempted by
experienced divers after proper training from
an internationally recognized agency.
3.2 Attention messages and
alarms
The Aladin One draws the diver's attention
to certain situations and warns of unsafe
diving practices. These attention messages
and alarms are visual and/or audible.
3.2.1

Attention messages

Attention messages are communicated
visually using symbols, letters or flashing
figures. In addition, 2 short audible
sequences can be heard (in an interval of
4 seconds) in 2 different frequencies under
water.
Attention messages come up in the
following situations:
max
2
• Maximum operating depth/ppO
reached.
• Set max depth is reached.
• Oxygen toxicity reaches 75%.
• No-stop time is less than 3 minutes.
• Prohibited altitude (surface mode).
• Entering decompression.
• Half of set dive time is reached.
• Set dive time is reached.
value
2
value decreases.
2
value is to 100%,
2
DEPTH in DEPTH in
meters feet
13m 43ft
6m 20ft
4m 13ft
WARNING
max is
2
ALADIN ONE USER MANUAL
2