User`s guide

Nemo Air Dive computer
6
Use the <+> and <-> buttons to set the selected
personal safety program.
Press the <CENTRAL> button to record the
new setting and return to the SETDIVE menu.
MODE: EAN
This section addresses dives with oxygen-rich
mixtures.
We recommend that you carefully read the
MODE: AIR section before proceeding further.
In EAN mode you can set:
• oxygen percentage (%O
2
) in the breathing mix;
• maximum O
2
partial pressure (PPO
2
);
• water selection;
• altitude;
• personal correction factor.
To set this dive mode, press the <CENTRAL>
button when “EAN” begins to flash.
%O
2
OXYGEN PERCENTAGE
The percentage of oxygen in the mix can be
adjusted within the interval 21% - 50%, in
increments of 1%.
When you enter this section the current oxygen
percentage set will flash (figure 8).
FIG. 8
Use the <+> or <-> buttons to enter the desired
value.
Press the <CENTRAL> button to record the
value selected and move to the next setting.
PPO
2
MAXIMUM PARTIAL OXYGEN
PRESSURE
Nemo Air features an alarm that signals the
diver when oxygen partial pressure reaches
the limit levels.
This limit can be varied from a minimum of
1.2 bar to a maximum of 1.6 bar, in increments
of 0.1 bar.
When you enter this section, the last value
entered will flash.
FIG. 9
As this value changes, Nemo Air will show
the maximum dive depth compatible with
the oxygen percentage and maximum partial
pressure that have been programmed
(figure 9).
Use the <+> or <-> buttons to enter the desired
value.
Press the <CENTRAL> button> to record
the new setting and move on to subsequent
settings, reviewed in the previous AIR section,
which are:
• WATER;
• ALT (altitude);
• PFACTOR (personal correction factor).
 WARNING
The use of oxygen-rich mixes exposes
the diver to different hazards from those
associated with compressed air. The
diver should be aware of these risks and
understand how to avoid them.
 WARNING
Do not use breathing mixes with an oxygen
percentage greater than 50%.
 WARNING
It is essential to correctly set the oxygen
percentage in the mix to ensure correct
readouts of:
• no-decompression time remaining;
• decompression stop times;
• alarm on exceeding the maximum
permitted PPO
2
.
MODE:BOTTOM TIME
In this case you can only set the WATER option,
described previously.
To select BOTTOM TIME dive mode, press the
<CENTRAL> button when BTIME appears and
flashes.
SET TANK
In this menu you can adjust the parameters for
the tank used:
1. Set Tank
1.1. units of measurement: bar-litres / psi-
cubic feet
1.2. first alarm: limit value for air reserves,
can be set from 80 bar (1160 psi) to
120 bar (1740 psi).
1.3. second alarm: limit value for air
reserves, can be set from 50 bar
(725 psi) to 70 bar (1015 psi).
1.4. tank capacity
To enter the SET TANK menu, press the
<CENTRAL> button
UNITS UNIT OF MEASURE FOR THE TANK
In this setting you can select the unit of
measure you wish to use:
• units:psi-cubic feet;
• units:bar-liters.
Entering this section, the unit of measure for
the tank volume will flash (figure 10).
FIG. 10
Use the <+> or <-> buttons to change the
setting. Press the <CENTRAL> button to record
the selection made and move on to the next
section.
AIR RESERVES ALARMS
With Nemo Air you can set two different alarm
thresholds that will signal the minimum air
reserves. When these thresholds are reached,
there will be various audible signals and visible
indications on the display.
The first threshold that can be set is:
RESERVE H
This first alarm can be set from 80 bar
(1160 psi) to 120 bar (1740 psi) in increments of
10 bar (145 psi), or it can be deactivated.
Entering this section will display the value
selected for air reserves; the value will flash.
The default value is 100 bar (1450 psi).
This value can be changed in increments of
10 bar (145 psi) using the <+> and <-> buttons
(figure 11), or this alarm can be switched off.
FIG. 11
Press <CENTRAL> to save your selection and
move to the next setting.
If you exceed the programmed threshold
during the dive, an audible alarm will sound
and the pressure value will flash.
The visible alarm will deactivate in surfacing
mode (figure 12).
FIG. 12
RESERVE L MINIMUM RESERVE
Values can be set from 50 bar (725 psi) to 70 bar
(1015 psi) in increments of 10 bar (145 psi).
The default value is 50 bar (725 psi) (figure 13).