Instruction Manual

SIRIUS Dive Computer
8
the percentage of oxygen in the breathable
mixture.
⚠
WARNING
Training is compulsory before the device
described in these instructions may be used.
The user must have received adequate
prior training on the use of SCUBA diving
equipment, both for use with air and for use
with Nitrox.
⚠
WARNING
Gaskets and o-rings for the Nitrox pressure
gauge must be lubricated exclusively with
oxygen-compatible grease; in the presence
of oxygen-rich mixtures, the use of other
types of lubricants may spark an explosion.
⚠
WARNING
In the event of use with mixtures
contaminated with oil, the entire system
must be cleaned and serviced by a Qualified
Technician at a Mares Lab Service Center.
CHECKS PRIOR TO USE, PREPARING FOR
THE DIVE AND USE
Slowly open the tank valve to avoid the “water
hammer” effect resulting from the high pressure
entering the tank module.
When using Nitrox or oxygen, always open the
tank valve very slowly to reduce the risk of an
explosion.
Once the tank valve is open and the system is
pressurized, close the valve and make sure
there are no leaks, checking that the pressure
indicated by the dive computer is stable and
does not drop. If a drop in pressure is detected,
do not dive and double check the entire
system.
During the dive, remember to check the
residual pressure frequently.
In addition to a numeric value for the tank
pressure, Sirius uses color coding for an
immediate at-a-glance tank pressure
visualization. The color is applied to the lower
screen divider bar. When the tank pressure
reaches 50 bar / 500 psi, the inside of the
bar turns red, to alert the diver of a low tank
pressure situation.
The tank module must only be used with CE-
marked SCUBA components.
MARKING
The instrument markings are the following:
• EN250: tested and certified according to
European Norm EN250;
• CE 0474: CE conformity and identification
number of notified body controlling
production in compliance with Module D of
European Regulation 2016/425
• 300 bar (NITROX/O2 200 bar max)
CARE, STORAGE AND TRANSPORT
Rinse your regulator and tank module
thoroughly in fresh water after every dive.
Ensure that the dust cap is installed on
the first stage prior to doing so. Store the
regulator and tank module in a dry place away
from direct sunlight. When travelling with
your equipment, it is best to use a padded bag
such as is commonly used to transport diving
equipment.
• 2. SET DIVE
MENU Description
SET DIVE
MODE
Allows you to choose
between air, nitrox, trimix and
bottom timer mode.
ALGORITHM
Allows you to set gradient
factors, personalization
levels, and more.
GAS INTEGR.
Allows you to synchronize
your Sirius with optional tank
modules and to define all
parameters concerning gas
integration (tank volume,
operating tank pressure, tank
reserve and more).
WARNINGS
Allows you to define and
activate certain warnings
individually.
MULTIGAS
Allows you to define
parameters relating to
multigas dives.
FUTURE
DECO
Allows you to set the
parameters for the future
deco prediction. Please refer
to section 2.6 for more details
on this.
WATER
Allows you to choose
between salt and fresh water.
DEEP STOP
Allows you to activate or
deactivate the visualization of
deep stops.
DECO STOP
Allows you to choose the
depth of the shallowest stop
among 3m/10ft, 4.5m/15ft,
6m/20ft.
ERASE
DESAT
Allows you to reset the
inert gas saturation to zero,
thereby erasing the effects of
a previous dive. This is only for
people who plan to lend their
computer to another diver
who has not performed a dive
within the last 24 hours.
ALL SILENT
Allows you to silence the dive
computer.
ASCENT
VIOL.
Allows you to turn off the dive
violation due to uncontrolled
ascent. This is for dive
instructors only, who may
find themselves in such a
situation because of their
teaching requirements.
SURFACING
MODE
Allows you to set the time
interval after surfacing
before the dive is closed.
CEIL-CON
DECO
Allows you to switch between
staged decompression and
continuous ascent (CEILing
CONtrolled).
BACKLIGHT
Allows you to choose
between AUTO-OFF (the
backlight stays on for only
6 s) or PUSH ON/PUSH OFF
(the light stays only until you
turn it off manually).
COMPASS
TIME
Allows you to set the duration
of the compass display before
it reverts back to the dive
data. You can set this value
to 5 seconds, 15 seconds or
PUSH ON/PUSH OFF. If set to
PUSH ON/PUSH OFF, you exit
compass mode with BL-SP.
2.1. MODE
In this menu you define the type of gas you
will be breathing during the dive (AIR as
SINGLE GAS, NITROX as SINGLE GAS, NITROX
as MULTIGAS, TRIMIX as MULTIGAS). You
can also set Sirius to BOTTOM TIMER, in
which case Sirius will show only time, depth
and temperature: it will not carry out any
decompression calculation and it will not show
any warnings and alarms.
Use TR-SP or BR-SP to highlight your choice,
then press TR-LP to activate it. AIR is the
equivalent of setting NITROX to 21% and a
ppO
2
max of 1.4bar.
When selecting NITROX, you are taken to
a submenu in which you can define the
percentage of oxygen in the mixture (O
2
%) and
the maximum value of oxygen partial pressure
(ppO
2
max) for up to three breathing mixes. The
maximum possible value for the ppO
2
max is
1.6bar. Most training agencies recommend not
to exceed a value of 1.4bar.
Once inside this menu, use TR-SP or BR-SP to
change the O
2
%, and watch how this affects the
maximum operating depth (MOD). Then with
TR-LP move on to the ppO
2
max and use TR-SP
or BR-SP to change the value, again noticing
how this affects the MOD. With TR-LP save and
exit the menu. Note that you can press BR-LP
after having set the O
2
% to save and exit
skipping the ppO
2
max setting.
⚠
WARNING
- Diving with Nitrox may only be
attempted by experienced divers after
proper training from an internationally
recognized agency.
- Before every dive and after changing
the tank, you must make sure that
the set oxygen concentration in Sirius
corresponds to the oxygen concentration
in the tank. Setting the wrong oxygen
concentration can lead to serious injury
or death.
This is also the menu where you would be
setting your decompression gases if you dived
with more than one gas. See chapter 11 for