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2.4.1. SEt dIVE
2.4.1.1. LIGHt (BACKLIGHT)
Smart Air has a backlight which can be
activated in case of low ambient light. The
backlight is activated by pressing and holding
the UP button. During a dive, the backlight will
stay on for the duration defined in this menu.
You can choose between 1 and 10 seconds.
NOTE
- The backlight consumes battery energy:
the longer the backlight stays on, the
less your battery will last.
- If the low battery warning is activated,
the backlight will be disabled.
In surface mode, the backlight can be activated
by pressing and holding the UP button. The
backlight will stay on for 6 seconds, unless you
go into any menu, in which case it will stay on
until you return to the pre-dive display or after
one minute of no button operation.
2.4.1.2. P FACt (P FACTOR)
Smart Air allows you to set an additional
personal safety factor for those circumstances
in which you want to be especially cautious,
such as after a long period of inactivity or
when planning a strenuous dive. In this
menu you can choose between the standard
algorithm (P0), a more conservative version
(P2) or an intermediate one (P1). On the pre-
dive, post-dive, logbook and planner displays,
P1 is displayed with p+, P2 with p++ and P0 is
indicated by the absence of symbols.
NOTE
The choice of p factor will be reflected in
the dive planner.
2.4.1.3. ALt (ALTITUDE)
Atmospheric pressure is a function of altitude
and of weather conditions. This is an important
aspect to consider for diving, because the
atmospheric pressure surrounding you has an
influence on uptake and subsequent release
of nitrogen. Above a certain altitude, the
decompression algorithm has to change in
order to account for the effect of the change
in atmospheric pressure. When diving in a
mountain lake, find out what the altitude is and
choose the altitude range in Smart Air within
the four available options:
- A0: from sea level to approximately
700m/2300ft;
- A1: from approximately 700m/2300ft to
approximately 1500m/4900ft ;
- A2: from approximately 1500m/4900ft to
approximately 2400m/7900ft;
- A3: from approximately 2400m/7900ft to
approximately 3700m/12100ft;
- We do not recommend diving at altitudes
above 3700m / 12100ft. If you do, set Smart
Air to bottom timer and find appropriate
altitude dive tables.
On the pre-dive, post-dive, logbook and
planner displays, A1 through A3 are indicated
with the mountain symbol filled with 1, 2 or 3
segments while A0 is indicated by the absence
of symbols.
WARNING
Diving in mountain lakes without first
setting Smart Air to the proper altitude
setting can cause severe injury or death.
2.4.1.4. WAtR (WATER)
You can set the computer for FRESH water,
SALt water or EN-319 calibration, depending
on where you intend to dive. Setting the
wrong water type entails an error in depth
measurement of 1-3% (e.g. at a depth of
30m/100ft, a computer set to salt water
will show 29m/97ft in fresh water whereas
a computer set to fresh water will show
31m/103ft in salt water). Note that this
does not affect the proper functioning of the
computer, since the computer performs all
of the calculations based purely on pressure
measurements.
2.4.1.5. GAS IntEGr (GAS INTEGRATION)
This menu contains five submenus. The first
one allows you to pair the tank modules to
Smart Air. Please refer to section 1.7 for the
description of the pairing process.
The second menu, tANK VOLM, allows you
to set the size of the volume of the tank,
individually for G1, G2 and G3. This parameter
is important for a correct evaluation of your
gas consumption in l/min or cu ft /min. Default
setting is 12l for metric system and 80 cubic
feet in imperial. For the imperial setting it
is paramount that you also set the correct
operating tank pressure, since the size of the
tank is referenced to this pressure.
The third menu, tANK OPERAt PrESS, is where
you define the nominal fill pressure of your
tanks. This can be set individually for each
tank (G1, G2 or G3). When the units are set
to ft/°F/psi, this value is important because
together with the tank volume it allows Smart
Air to correctly evaluate your gas consumption
in cu ft/min. Default values are 200bar and
3000psi.
The fourth menu, tANK WARN, is the value at
which Smart Air triggers a half tank warning.
This can be set individually for each tank (G1, G2
or G3). Default values are 100bar and 1500psi.
The fifth menu, tANK RSRV, is the value at which
an alarm is triggered because you should always
be at the surface before reaching this level.
Furthermore, this value is used to calculate the
TTR value (see section 3.2.5 and 3.3). This can
be set individually for each tank (G1, G2 or G3).
Default values are 50bar and 500psi.
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