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2.4 DIVE PLANNER
This function allows you to scroll through the
no decompression limits, automatically taking
into account the current residual saturation
of the tissue compartments from a preceding
dive. The times shown when scrolling the
no decompression limits take into account
the information entered under the set dive
submenu: altitude, personal safety factor,
Air, or in the case of Nitrox, the values for the
oxygen percentage and its maximum partial
pressure. For each depth, the display shows
the corresponding no deco time expressed
in minutes. If Nitrox mode is selected, the
maximum depth shown in the planner is
limited by the MOD.
NOTE
The dive planner is enabled only if either
air or nitrox mode is set
2.5 INFO
This submenu provides information about the
hardware and software of your Matrix.
• 3 DIVING WITH MATRIX
3.1 A FEW WORDS ABOUT NITROX
Nitrox is the term used to describe breathing
gases made of oxygen-nitrogen mixes with
an oxygen percentage higher than 21% (air).
Because Nitrox contains less nitrogen than
air, there is less nitrogen loading on the
diver’s body at the same depth as compared to
breathing air.
However, the increase in oxygen concentration
in Nitrox implies an increase in oxygen partial
pressure in the breathing mix at the same
depth. At higher than atmospheric partial
pressures, oxygen can have toxic effects on the
human body. These can be lumped into two
categories:
- Sudden effects due to oxygen partial
pressure over 1.4bar. These are not related
to the length of the exposure to high partial
pressure oxygen, and can vary in terms
of the exact level of partial pressure they
happen at. It is commonly accepted that
partial pressures up to 1.4bar are tolerable,
and several training agencies advocate
maximum oxygen partial pressures up to
1.6bar.
- Long exposure effects to oxygen partial
pressures over 0.5bar due to repeated and/
or long dives. These can affect the central
nervous system, cause damage to lungs or
to other vital organs.
Matrix keeps you safe with respect to these
two effects in the following ways (as long as it
is set to either air or nitrox):
• Against sudden effects: Matrix has an MOD
alarm set for a user-defined ppO
2
max. As
you enter the oxygen concentration for the
dive, Matrix shows you the corresponding
MOD for the defined ppO
2
max. The default
value of ppO
2
max from the factory is 1.4bar.
This can be adjusted to your preference
between 1.2 and 1.6bar. Please refer to
section 2.2.1.1 for more information on how
to change this setting. If Matrix is set to air,
the ppO
2
max is set to 1.4bar by default.
• Against long exposure effects: Matrix
“tracks” the exposure by means of the
CNS % (Central Nervous System). At levels
of 100% and higher there is risk of long
exposure effects, and consequently Matrix
will activate an alarm when this level of
CNS% is reached. Matrix also warns you
when the CNS level reaches 75%. Note that
the CNS% is independent of the value of
ppO
2
max set by the user.
3.2 ALARMS
Matrix can alert you of potentially dangerous
situations. There are five different alarms:
- Ascent rate alarm;
- Exceeding a safe ppO
2
/MOD;
- CNS =100%;
- Missed decompression stop;
- Low battery during the dive
WARNING
When in bottom timer mode, all warnings
and all alarms are OFF aside for the low
battery alarm.
NOTE
- Alarms are both visual and audible, as
described in detail below.
- If you are in compass mode when an
alarm is triggered, Matrix will revert to
the default computer display in order to
properly display the message related to
the alarm.
- Ascent rate alarm has priority over
other alarms if they are triggered
simultaneously.
3.2.1 ASCENT RATE
As soon as depth decreases Matrix activates
the ascent rate control algorithm and displays
the calculated value. This is shown in lieu of
the dive time in the bottom left corner for the
duration of the ascent.
WARNING
A rapid ascent increases the risk of
decompression sickness.
If Matrix determines an ascent rate of 10m/
min / 30ft/min or higher, the fast ascent alarm
is triggered: an audible alarm goes off and
the message SLOW DOWN is displayed at the
bottom of the screen. This persists until the
ascent rate is reduced to 10m/min / 30ft/min
or less.
If the ascent rate exceeds 12m/min / 40ft/min
at a depth below 12m / 40ft, the message on
the screen changes to TOO FAST. If a speed in
excess of 12m/min / 40ft/min is maintained for
two thirds or more of the depth at which the
alarm was first triggered, Matrix considers it a
dive violation and the display will show .
In this case, if the diver attempts a repetitive
dive after surfacing, Matrix will only function
as a depth gauge and timer (bottom timer
mode), and will display the message LOCKED
in the middle of the screen.
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