Altitude Diving; Altitude Classes, Altitude Warning And No-Fly Time After A Dive - Uwatec Meridian Manual

3. Meridian as a dive computer
3.7 Altitude diving
3.7.1 Altitude classes, altitude
warning and no-fly time after
a dive
Going to altitude is in a way similar to starting
an ascent from a dive: you expose your
body to a lower partial pressure of nitrogen
and consequently you start offgassing. After
a dive, given the higher nitrogen loading
in your body, even reaching an otherwise
negligible altitude can potentially cause
decompression sickness. Consequently,
Meridian constantly monitors the ambient
pressure and uses it to evaluate your
nitrogen loading and offgassing. If Meridian
notices a drop in ambient pressure not
compatible with your current nitrogen
loading, it will activate a warning to alert
you of the potentially dangerous situation.
If you have remaining desaturation on
Meridian, you can view the current altitude
and the prohibited altitude by pressing
the –/DOWN button from the main time
display. In the top left corner, Meridian
will display two numbers: the left number
represents the current altitude, whereas
the right number represents the prohibited
altitude (the altitude which Meridian has
computed to be incompatible with your
current nitrogen saturation levels). Altitude
here is given in classes from 0 up to 4.
Please read chapter 3.7.2 altitude and
the decompression algorithm for more
details on this.
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Current Altitude Prohibited Altitude
Class Class
By pressing SEL/ESC button the next
display will be shown:
Time since the last
dive (interval)
In the top right corner Meridian shows
the no-fly time and the no FLy symbol.
The no-fly time is the time during which
an exposure to the reduced pressure
inside the cabin of an airplane could cause
decompression sickness, as calculated
by the decompression model in the dive
computer.
In the top left Int is displayed (the time since
the last dive) and in the middle row the time
is counting.
In the bottom row the Oxygen toxicity (CNS
O ) is shown in % values.
2
After the full desaturation the interval
display disappears and the Gas setting
menu is shown directly.
No-fly time and
symbol
Oxygen toxicity
SCUBAPRO MERIDIAN