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Direction for use
Computer Leonardo
ENGLISH
cressi.com
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TABLE OF CONTENTS
page 5
page 10
TIME SET mode:
Date and time adjustment
page 31
SYSTEM mode:
Setting of measurement unit and reset page 31
Operation of the Leonardo computer page 13
3 - WHILE DIVING: COMPUTER
FUNCTIONS
Main specifications
General recommendations
and safety measures
Introduction
page 4
1 - COMPUTER CONTROL
2 - BEFORE DIVING
DIVE SET mode:
Setting of dive parameters
Oxygen partial pressure (PO2)
Nitrox - Percentage of the oxygen (FO2)
Dive Safety Factor (SF)
Deep Stop
Altitude
PLAN mode:
Dive planning
GAGE mode:
Depth gauge and timer
page 16
page 16
page 18
page 22
page 22
page 23
page 27
page 27
Diving within no decompression limits
DIVE AIR function:
Dive with Air
DIVE NITROX function:
Dive with Nitrox
Before a Nitrox dive
Diving with Nitrox
CNS toxicity display
PO2 alarm
Ascent rate
Safety Stop
Decompression forewarning
Deep Stop
page 36
page 37
page 37
page 37
page 40
page 40
page 43
page 45
page 45
page 46
page 46
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Diving outside no decompression limits page 50
Omitted Decompression stage alarm page 51
GAGE MODE
depth gauge and timer)
page 52
Use of the computer with
poor visibility
page 56
4 - ON SURFACE AFTER DIVING
Data display and management
Surface interval
PLAN function - Dive plan
LOG BOOK function - Dive log
HISTORY function - Dive history
DIVE PROFILE function - Dive profile
PCLINK function
Pc compatible interface
System Reset
Reset of the instrument
page 59
page 59
page 60
page 61
page 65
page 65
page 66
page 70
5 - CARE AND MAINTENANCE
Battery replacement
page 71
6 - TECHNICAL SPECIFICATIONS
7 - WARRANTY
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Congratulations on your purchase of your Leonardo underwater computer, a sophisticated
and complete instrument, realized in order to
offer you the utmost safety, efficiency, and reliability.
Always keep this manual with your Leonardo.
Main specifications.
• The Leonardo features a new Cressi RGBM
agorithm, created in conjunction with the
expertise of Bruce Wienke and based on
the Haldane model, integrated with RGBM
factors. This algorithm allows for safe decompression calculations for multiple dives
spread out over multiple days.
• Tissues: 9 with saturation hemi-phases between 2.5 and 480 minutes;
• ”Dive” program: Full processing of dive
data, even with decompression (if any), for
any air or hyper-oxygenated mixture (Ni-
trox) dive.
• Full setting of FO2 (percentage of the oxygen) and PO2 (partial oxygen pressure) parameters: PO2 may be set between 1.2 bar
and 1.6 bar, FO2 between 21% and 50%.
• A Nitrox dive may be carried out after an
air dive (even with desaturation in progress).
• Possibility of Deco (decompressive computations) or Gage program setting (depth
gauge and timer).
• Deep Stop can be enabled or disabled.
• Large display with ”PCD System” for perfect understanding and readability of values.
• Replaceable display protective cover.
• Battery replacement can be carried out by
the user.
• Planning: Scrolling of the safety curve.
• Unit of measure change from the metric system (meters and °C) to the feet system (ft°F) by the user.
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•
•
•
•
•
Sound and visual alarm systems.
CNS oxygen toxicity graphic indicator.
Backlit display.
Built-in calendar and clock.
Logbook (70 hours or 60 dives) including
dive profile.
• Dive history.
• The instrument may be fully reset, in case
of renting.
• PC/Mac interface with simulator and dive
profile (optional).
GENERAL RECOMMENDATION AND
SAFETY MEASURES
WARNING: please read the instructions! Read carefully this handbook, including
the safety measures paragraphs. Please be
sure of perfectly understanding your instrument’s use, functions and limits before using
it! DO NOT use your instrument without
reading every part of this handbook!
WARNING: this instrument is designed
to be a dive aid and does not replace the
use of the dive tables.
DANGER: AN UNDERWATER DIVING COMPUTER CAN NEVER
COMPLETELY ELIMINATE THE RISK
OF DECOMPRESSION SICKNESS
(EMBOLISM). IT MUST BE CLEAR
THAT AN UNDERWATER DIVING
COMPUTER CAN NEVER COMPLETELY ELIMINATE THE RISK OF DECOMPRESSION SICKNESS. IN FACT,
THE COMPUTER CANNOT TAKE
INTO ACCOUNT THE PHYSICAL
CONDITIONS OF THE DIVER
WHICH MAY VARY DAILY. IT IS RECOMMENDED THAT A MEDICAL EXAMINATION IS COMPLETED PRIOR
TO COMMENCING ANY UNDERWATER DIVING ACTIVITY, AND TO AS-
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SESS ONE’S OWN PHYSICAL CONDITION BEFORE EACH DIVE. CIRCUMSTANCES SUCH AS COLD
WATER TEMPERATURE (LESS THAN
50F), POOR PHYSICAL CONDITION,
MULTIPLE DIVES IN SUBSEQUENT
DAYS, WEARINESS, USE OF ALCOHOL, DRUGS, OR MEDICATION
AND DEHYDRATION MAY INCREASE THE RISK OF DECOMPRESSION SICKNESS. PLEASE AVOID ALL
THESE SITUATIONS AS WELL AS
ANY OTHER THAT MIGHT ENDANGER YOUR LIFE: EVERYONE HAS TO
BE RESPONSIBLE FOR ONE’S OWN
SAFETY!
a dive’s safety is only guaranteed by a correct preparation.
WARNING: this instrument should be
used only by properly trained and certified
divers. No computer will replace proper
underwater training. Please remember that
WARNING: While diving, be equipped
with a depth gauge, a manometer, a diving
timer or watch and dive tables. Please always
check your diving cylinders’ pressure to be fit
WARNING: The Leonardo computer
by Cressi is designed for sport diving only. It
is not intended for commercial or professional use, requiring longer dive times and
greater depths. Diving beyond the parameters of sport diving dramatically increases
the risk of decompression sickness.
WARNING: Before using the computer, please check the battery life status and
the visibility of the LCD display. DO NOT
dive if the instruments’ indications are not
perfectly clear and, first of all, if the battery
is low.
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to the planned dive and, while diving, often
check the cylinders’ air capacity by means of
your manometer.
DANGER: DO NOT DIVE AT HIGH
ALTITUDES BEFORE SETTING THE
CORRECT ALTITUDE. ONCE SET,
PLEASE CHECK THE ALTITUDE
LEVEL ON THE DISPLAY. PLEASE REMEMBER THAT DIVING AT HIGHER
ALTITUDES THAN 9.842 FT. ABOVE
SEA LEVEL INVOLVES A REMARKABLE INCREASED RISK OF DECOMPRESSION SICKNESS.
DANGER: BEFORE EMBARKING
ON A FLIGHT, PLEASE WAIT UNTIL
THE ICON "NO FLY TIME" ON YOUR
COMPUTER DISPLAY HAS DISAPPEARED.
WARNING: the present instrument’s
use is strictly personal; the information it
supplies refer, in fact, exclusively to the individual who has used it during a dive or a
series of dives.
DANGER : CRESSI DOES NOT RECOMMEND THE USE OF THIS INSTRUMENT IN DECOMPRESSION
DIVES. IF, FOR ANY REASON, THE NO
DECOMPRESSION LIMITS HAVE BEEN
EXCEEDED, THE CRESSI COMPUTER
WILL DISPLAY THE INFORMATION
RELATED TO DECOMPRESSION, SURFACING AND SURFACE INTERVAL
TIMES.
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WARNING: Do not dive using Nitrox
mixtures without checking the contents and
correct O2 percentage (FO2). After doing
so, set your computer with the mixture(s)’
value so that it may process the decompression computations. Please be advised
that the computer only accepts FO2 values
to the nearest whole number.
WARNING: Before diving, check instrument parameter settings.
DANGER: Leonardo always keeps
the latest oxygen setting set. It is very
important for diver's safety to always
check this parameter before each dive.
DANGER: CRESSI DISCOURAGES
NITROX DIVES WITHOUT PROPER
TRAINING. NITROX DIVES WILL EX-
POSE THE DIVER TO DIFFERENT
RISKS THAN THOSE OF AIR DIVES,
INCLUDING SERIOUS PHYSICAL
DAMAGES AND, IN EXTREME
CASES, EVEN DEATH.
DANGER: AS A SAFETY MEASURE
THE COMPUTER UTILIZES A PO2 SET
AT 1.4 BAR EVEN FOR AIR DIVES. IF IT
IS NECESSARY TO INCREASE THE
SAFETY MARGIN, IT IS POSSIBLE TO
SET PO2 TO LOWER VALUES, UP TO
1.2 BAR, BY DECREMENTS OF 0.1 BAR.
WARNING: after a dive with Leonardo
set in Gage mode (depth gauge-timer), the
instrument will not make saturation and desaturation computations during the subsequent 48 hours.
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WARNING: avoid any dive presenting
very risky profiles, such as "yo-yo" dives,
dives with reversed profiles or several subsequent dives during subsequent days, since
they are potentially dangerous and present
a higher risk of decompression sickness!
WARNING: Currently, no validated
scientific literature allows to dive more than
twice a day for periods of one or more weeks
without the risk of decompression sickness.
For your own safety, it is important to avoid
diving for more than two times a day.
A rest of at least 2 hours between two subsequent dives is mandatory. The next/repetitive dive shall be shallower and its minimum
duration shall be 15 minutes.
WARNING: please utilize the most conservative safety factor any time you are
aware of factors that might increase the risk
of decompression sickness. By doing so, you
will dive more conservatively and safety.
NOTE: while flying, the instrument must
be stored in the pressurized cabin.
NOTE: Cressi reminds that all sport dives
must be conducted within the no decompression limits and at a maximum depth of
132 ft, limit of sport dives. Exceeding these
limits dramatically increases the likelihood
of decompression sickness.
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As a result of technological advancements,
Cressi reserves the right to modify the instrument without notification.
Introduction.
The Leonardo computer by Cressi is a multifunctional instrument for sport diving. It will
supply any wanted information on depth, dive
times, decompression status, ascent rate and
surface interval times between dives. Nitrogen
absorption and release is continuously processed by its sophisticated software, taking into
account the quantity of inert in the different
mixtures which can be used. Such information
is displayed on the instrument’s large display,
thanks to the PCD (Priority Compartment
Digit Display) System, allowing an easy and direct “dialogue” between the diver and the
computer, ensuring a clear understanding of all
the data needed at any given time and a perfect readability in any situation. The computer
is provided with clock and calendar, a versatile
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dive memory (logbook), as well as a dive simulator. The mathematical model of Leonardo
can make saturation and desaturation computations of dives carried out both with air and
with Nitrox, whose parameters can all be set:
from the maximum allowed PO2 value (between 1.2 bar and 1.6 bar), to the mixture’s
oxygen percentage (FO2) between 21% and
50% of O2. Additionally, the instrument may
be set by the user for either metric (m-°C) or
feet system (ft-°F).
The Leonardo computer by Cressi is a multifunctional instrument for sport diving. It will
supply any wanted information on depth, dive
times, decompression status, ascent rate and
surface interval times between dives. Nitrogen
absorption and release is continuously processed by its sophisticated software, taking into
account the quantity of inert in the different
mixtures which can be used. Such information
is displayed on the instrument’s large display,
thanks to the PCD (Priority Compartment
Digit Display) System, allowing an easy and direct “dialogue” between the diver and the
computer, ensuring a clear understanding of all
the data needed at any given time and a perfect readability in any situation. The computer
is provided with clock and calendar, a versatile
dive memory (logbook), as well as a dive simulator. The mathematical model of Leonardo
can make saturation and desaturation compu-
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tations of dives carried out both with air and
with Nitrox, whose parameters can all be set:
from the maximum allowed PO2 value (between 1.2 bar and 1.6 bar), to the mixture’s
oxygen percentage (FO2) between 21% and
50% of O2. Additionally, the instrument may
be set by the user for either metric (m-°C) or
feet system (ft-°F).
In order to understand all the computer’s
functions and their meaning, the manual is divided into five main chapters, dealing with
every possible use:
• 1 - Introduction and safety measures
• 2 - Before diving
• 3 - While diving
• 4 - On surface after diving
• 5 - Care and maintenance
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COMPUTER CONTROL
OPERATION OF THE LEONARDO
COMPUTER
Leonardo is provided with a user friendly display, which “escorts” the diver during any operation. Leonardo’s screen different modes
change by repeatedly depressing the button
which is the key to operating the system. They
are clearly indicated by the alpha-numeric display. The same button enables to access the
sub-menus and to switch on back-lighting (on
sea surface in PRE-DIVE mode only).
Pressing the button, Leonardo switches on and
the PRE DIVE screen is displayed. This screen
displays the following data:
- Maximum partial oxygen pressure
- Type and percentage of respiratory mixture
used (Air im. 1 / Nitrox im. 2)
- Maximum depth which can be reached with
the previously set parameters.
- Dive Safety Factor (SF/0/1/2)
- Altitude level (if set)
- GAGE function (if set)
- Battery charge level
- Current time
Pressing again the button it is possible to browse
the main menu with 9 screen modes im. 3:
1) LOG-00: It is the logbook and the number
next to “log” is the dive number.
2) DIVE-S: The purpose of Dive-set is to set
the dive parameters. In this mode it is possible to set two of the three functions of the
program of the computer, that is DIVE AIR
and DIVE NITROX.
3) TIME-S: The purpose of Time-set is to set
date and time.
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4) PLAN: For dive planning
5) GAGE: It is the third dive function of the
computer. It acts just as timer and depth
gauge.
6) PCLINK: For the connection to a personal
computer.
7) HISTORY: This mode displays dive history.
8) SYSTEM: In system mode, it is possible to
set the measurement unit of the computer
and a RESET can be performed.
9) PRE DIVE: In this mode, the time of the
day is displayed on the bottom of the
screen (clock icon). It is the main screen of
the computer.
To access the menu of these screens (except history and pclink) press and hold
the button. Pressing and releasing the
button, it is possible to browse the data
of the menus. The computer automatically returns to the first screen of the
menu.
All the operations available for each mode of
the display will be explained in this manual.
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PRE DIVE SCREENS
PRE DIVE SCREENS
AIR
PRESS
AND
HOLD
PRE DIVE
NITROX
PRESS
AND
HOLD
LIGHT
(im. 1)
PRE DIVE
COMPUTER MENUS
(im. 3)
LIGHT
(im. 2)
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2 - BEFORE DIVING
DIVE-SET MODE: Setting of dive parameters.
Once switched on, the computer is in PRE
DIVE screen mode. The settings for the next
dive are displayed here. The parameters can be
changed by repeatedly pressing the button and
accessing the DIVE SET (DIVE-S) mode, which
enables to select the dive parameters related to:
Partial Oxygen Pressure (PO2)
Nitrox-Percentage or Fraction of oxygen
(FO2)
Dive Safety Factor (SF)
Altitude (ALT.)
Deep Stop
WARNING: If the screen displays
the battery icon with a single segment
on, the computer MUST NOT BE
USED. If it is displayed during a dive,
stop the dive and return to the surface.
The battery can be replaced by the
user (refer to the relevant chapter).
PARTIAL OXYGEN
(PO2) (im. 4)
PRESSURE
Leonardo is factory set with a Partial Oxygen
Pressure (PO2) value of 1.4 bar for both air
dives and Nitrox dives, in order to ensure the
maximum safety during any type of dive. However, it is possible to change the PO2 setting
on values between 1.2 bar (included) and 1.6
bar (included), with steps of 0.1 bar, obtained
each time the button is pressed. If it is necessary to increase the safety margin of the dive, it
is possible to set PO2 to lower values, up to a
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minimum of 1.2 bar. Just press the central button up to the DIVE SET mode, displayed in the
picture 5, then press and hold the button to
enter the mode. The indication of the partial
oxygen pressure (PO2) will flash. Press and hold
again. The display shows just the highlighted
item, flashing. Change it by pressing again the
button. Once the desired setting is reached (values between 1.2 bar and 1.6 bar, with steps of
0.1 bar) wait for a few seconds. The computer
automatically changes the settings, issuing a
sound signal and then returns to the main
screen.
WARNING: the computer maintains
the PO2 setting until it is manually reset by
the diver on different values.
NOTE: by varying the maximum PO2 set
and the percentage of oxygen in the FO2
mixture, the computer indicates the maximum depth which may be reached.
WARNING: The PO2 is set by the manufacturer on the default value of 1.4 bar,
for both air dives and Nitrox dives. This
way, the safety of the diver is ensured by
following the most conservative values recommended for sport dives. However, it is
possible to select another value PO2 value,
as indicated in the chapter related to Nitrox
dives. The value set will be stored in the
computer until the diver resets it.
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NITROX - PERCENTAGE OF THE
OXYGEN (FO2) (Fig. 5)
With this setting, it is possible to decide the
type of dive: with air (Dive Air Program), with
fraction of oxygen at 21%, or oxygen enriched
(Dive Nitrox Program).
To set the correct percentage of the Oxygen
contained in the Nitrox mixture, press the
central button until you reach the DIVE SET
mode. Press and hold the button to enter the
mode. The PO2 indication starts flashing. Press
again the button. The indication of the fraction
of Oxygen (FO2) starts flashing. Press and hold
again. The display shows just the highlighted
item, flashing. Change it by pressing again the
button. Once the desired setting is reached
(values between 21% and 50% with steps of
1% of O2) wait for a few seconds. The computer automatically changes the settings, issuing a sound signal. Then it automatically
returns to the main screen.
P
NOTE: The Leonardo computer is factory
set on the DIVE AIR program, with the Nitrox mixture set to Fo2 at 21%.
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SETTING OF PARTIAL OXYGEN PRESSURE - PO2
PRESS
PRESS
AND
HOLD
PRESS
AND
HOLD
(im. 4)
PRESS
AUTOMATIC
RETURN
PRIMARY MENU
SECONDARY MENU
TERTIARY MENU
When the computer issues a sound signal, it means that the
setting has been stored, then it automatically goes back to
the previous menus.
TERTIARY MENU
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SETTING OF NITROX FO2 MIXTURE
PRESS
PRESS
AND
HOLD
PRESS
AND
HOLD
PRESS
PRIMARY MENU
SECONDARY MENU
SET THE DESIRED
PERCENTAGE
PRESS
TERTIARY MENU
PRESS
TERTIARY MENU
(im. 5)
WAIT FOR
3
SECONDS
AUTOMATIC
RETURN
When the computer issues a sound signal, it means that the setting has
been stored, then it automatically
goes back to the previous menus.
SECONDARY MENU
PRIMARY MENU
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NOTE: by varying the PO2 set, the computer indicates the maximum depth which
may be reached with that mixture.
It is possible to change the setting of the Nitrox
mixture also during the surface interval (with
desaturation in progress), but only after 2 minutes from the start of the interval.
This is a very important feature, especially for
divers who perform a series of subsequent
dives (for instance trainers), which enables to
change one's mixture after having dived, for instance, once with air, without having to wait
for complete desaturation.
WARNING: Once the percentage of
oxygen FO2 has been set, it remains stored
in the computer until it is changed again.
DANGER: Leonardo always keeps
the latest oxygen setting set. It is very
important for diver's safety to always
check this parameter before each dive.
DANGER: If you dive again after a
Nitrox dive, it is fundamental for one's
safety to check for the type of mixture
contained in the cylinder, setting the
Fo2 of the computer according to that
mixture.
DANGER: Do not dive with cylinders
containing nitrox mixtures whose percentage of oxygen has not been personally checked.
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DIVE SAFETY FACTOR (SF) (im. 6)
DEEP STOP (im. 7)
The Safety Factor is an additional parameter
whose purpose is to make dives safer based on
the existence of personal risk factors which increase the risk of decompression sickness. The
diver can set it on three values: SF0/SF1/SF2.
The factory setting is SF0, i.e. disabled.
There are different diving teaching methodologies and decompression theories. Each of those
has been developed according to important
scientific concepts, lab tests and practical tests.
Some of those, during specific dives, support
and require DEEP STOP, while others do not
contemplate this type of decompression profile. Leonardo is factory set on DEEP STOP. If
you want to disable it, just press the button until
you reach the DIVE SET mode, press and hold
to enter the mode, press to browse until DEEP
STOP flashes. Now press and hold until
“Deepst” “ON” is displayed. Pressing, OFF is
displayed and the arrow icon on the bottom
right disappears. Deep Stop has been disabled.
The computer automatically returns to the
main menu.
WARNING: Enable and set a higher
safety factor (SF2/SF3) whenever you are
aware of conditions which may increase the
risk of decompression sickness. This way,
non decompression times will be shorter
and the dive will be more conservative, ensuring a greater safety.
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ALTITUDE (im. 8)
When diving at a location above sea level, it is
important to check that the appropriate altitude has been set. Once entered the DIVE-S
menu, reach the parameter altitude “Alt. 0”. A
digit flashes next to Alt. Press and hold; the
screen shows the corresponding altitude levels,
indicated with:
ALT. 0 (no mountain) - da 0 a 700 m
ALT. 1 (1 mountain) - da 700 a 1500 m
ALT. 2 (2 mountains) - da 1500 a 2400 m
ALT. 3 (3 mountains) - da 2400 a 3700 m
Each icon indicates that the computer has automatically changed its mathematical model
depending on the altitude reached, providing
reduced curve times with the increase of altitude.
In case of dive at an altitude higher than the
one where the diver usually lives, the body
experiences alterations due to nitrogen oversaturation which must rebalance with the external environment. It is important to remind
that, due to the lower partial pressure of the
oxygen in the atmosphere, our body needs
an acclimatization period. It is therefore recommended to wait at least 12/24 hours
after arriving at a location above sea level before diving.
DANGER: Leonardo does not automatically handle dives at a location
above sea level. Thus, it is mandatory
to correctly set the altitude level and
respect the acclimatization period before diving.
DANGER: Diving at altitudes
greater than 9,842 ft. above sea level
involves an increased risk of decompression sickness.
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SAFETY FACTOR SETTING
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
AND
HOLD
PRESS
SECONDARY MENU
SECONDARY MENU
PRESS
TERTIARY MENU
PRESS
TERTIARY MENU
WAIT FOR
3
SECONDS
(im. 6)
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DEEP STOP ON/OFF
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
PRESS
AND
HOLD
SECONDARY MENU SECONDARY MENU
PRESS
TERTIARY MENU
PRESS
TERTIARY MENU
WAIT FOR
3
SECONDS
(im. 7)
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ALTITUDE SETTING
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
AND
HOLD
PRESS
SECONDARY MENU
SECONDARY MENU
PRESS
TERTIARY MENU
PRESS
TERTIARY MENU
WAIT FOR
3
SECONDS
(im. 8)
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PLAN MODE: Dive planning (im. 9)
While on the surface, it is possible to go to the
PLAN function in order to visualize, depending on the mixture used (Nitrox or air) the
remaining time available at different depths,
without having to make decompression stops
(safety curve). The values are given both for
the first of a (possible) series of dives and during the surface interval between two or more
subsequent dives; in such case, Leonardo takes
into account the residual nitrogen, therefore
reducing the times in the safety curve. To access the PLAN MODE, once the computer is
on, press the button until PLAN is displayed.
Pressing and holding the button it is possible
to access the function. The screen displays a
safety curve (no decompression times) related
to the different depths between 30 ft. and 157
ft, with manual steps of 10 ft., achieved by
pressing the button. Wait for a few seconds to
return to the main screen.
NOTE: the PLAN function will be switched
off if the computer shows Error.
GAGE MODE: Depth gauge and timer
(im. 10)
The computer is provided with a third program called GAGE (depth gauge and timer)
that may be used for both apnea (free divers)
divers and for the use in technical dives. In this
case, the instrument provides just the dive
basic parameters, i.e. depth and dive time. It
does not make tissue saturation and de-saturation computation, which must be programmed and computed by means of proper
software and/or tables. Cressi reminds you
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28
that sport dives must be carried out within the
no decompression guidelines, and at the maximum depth of 132 ft., which is the limit of
sport diving: to exceed such limits dramatically
increases the risk of decompression sickness!
WARNING: After a dive in GAGE
mode, the instrument will not make saturation and de-saturation computations for
the following 48 hours.
WARNING: The Leonardo computer
is designed for sport diving only. It is not intended for commercial or professional use,
requiring longer dive times and greater
depths. Diving beyond the parameters of
sport diving dramatically increases the risk
of decompression sickness.
DANGER: Should you decide to
reset the instrument by accessing the
system mode, the nitrogen memory
will be cancelled. Therefore, the instrument will not be able to compute
the following dive. Before using this
function, wait for at least 48 hours
after the last diving activity.
DANGER: Cressi discourages diving
with gaseous mixtures other than air without proper training. The use of “technical” multi-gas mixtures may expose the
diver to different risks than those of sport
diving, including serious physical damages
and, in extreme cases, death.
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To access the GAGE program, press the button until the “GAGE” screen is displayed, then
press and hold the button until OFF flashes.
Pressing again, OFF becomes ON, after a few
seconds the computer issues a sound and at
the same time the function is enabled.
PLAN mode is disabled.
NOTE: The Leonardo computer is factory
set on the “DIVE AIR” function.
NOTE: The depth indicator gives indications between 0 – 393 ft.
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PLAN MODE
PRESS
(im. 9)
PRESS
AND
HOLD
PRIMARY MENU
PRESS
SECONDARY MENU
PRESS
SECONDARY MENU
WAIT FOR
3
SECONDARY MENU SECONDS
GAGE MODE
PRESS
AND
HOLD
PRESS
PRIMARY MENU
(im. 10)
PRESS
SECONDARY MENU
SECONDARY MENU
WAIT FOR
3
SECONDS
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R
S
TIME SET MODE
SYSTEM MODE
Date and time adjustment. (im. 11)
Units of measure setting (im.12)
Press the button up to the TIME SET mode.
Press and hold the button to enter the mode.
The digits of the year start flashing, press again
to set month, day and 12/24 hours settings. Go
to the desired setting. Press and hold again.
The display shows just the highlighted item,
flashing. Change it by pressing again the button. Once the desired setting is reached, wait
for a few seconds. The computer automatically
changes the settings, issuing a sound signal.
Then it automatically returns to the main
screen.
The Leonardo computer can make computations by metric units (depth in meters and temperature in °C), or in feet and temperature in
°F. To change the unit of measurement, press
the button up to the SYSTEM mode, then
press and hold to enter the mode. “s.unit” (set
unit) is displayed with the indication °C/m. or
°F/ft. Press and hold. The indications start flashing. To change them, press and wait. The
computer stores the settings, issuing a sound
signal, then automatically returns to the main
screen.
NOTE: To store exact information in the
computer logbook, remember to check for
correct time and date settings.
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Instrument reset. (im. 13)
To reset the instrument, press the button up
to the SYSTEM mode, then press and hold to
enter the mode. “s.unit” (set units) is displayed
with the indication °C/m. or °F/ft. Press again.
“S.RESET_NO” (system reset) is displayed.
Press and hold. The indication NO flashes.
Press. YES is displayed. Press and hold.
“SURE?_NO”. is displayed. Press. “YES” is displayed. Press and hold. Wait for a sound signal.
Dots and the writing “DONE!” are displayed.
The instrument is reset. Then it automatically
returns to the main screen.
By resetting the instrument, all the computations related to the current de-saturation are
reset.
DANGER: Do not reset your instrument if it has to be used to compute
subsequent dives!
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TIME SET MODE
(im. 11)
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
AND
HOLD
PRESS
SECONDARY MENU
SECONDARY MENU
PRESS
TERTIARY MENU
PRESS
AUTOMATIC
RETURN
TERTIARY MENU
SECONDARY MENU
PRIMARY MENU
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SYSTEM MODE: SETTING OF MEASUREMENT UNIT
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
AND
HOLD
(im. 12)
PRESS
AUTOMATIC
RETURN
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SYSTEM MODE: INSTRUMENT RESET
)
PRESS
PRESS
AND
HOLD
PRESS
PRIMARY MENU
PRESS
PRESS
AND
HOLD
SECONDARY MENU
PRESS
AND
HOLD
(im. 13)
PRESS
SECONDARY MENU SECONDARY MENU
PRESS
PRESS
AND
HOLD
AUTOMATIC
RETURN
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WHILE DIVING
COMPUTER FUNCTIONS (im. 14-15)
The computer can be set with three different functions:
1) DIVE AIR if dives are performed with air
and you want to use a decompression computation.
2) DIVE NITROX if dives are performed
with Nitrox and you want to use a decompression computation..
3) GAGE if you do not want to use a decompression computation.
NOTE: The Leonardo computer is factory
set on the DIVE AIR program, with the mixture’s O2 value on 21% and PO2 on 1.4.
FO2 values different from Air 21% activate
the computation program Dive Nitrox.
DIVING WITHIN NO DECOMPRESSION LIMITS
DIVE AIR function: Dive with air. (im. 14)
The Leonardo computer automatically starts
the DIVE AIR program at a depth exceeding
3.93 ft.. During a dive within the no decompression limits, the display will show the following information:
1) Current depth value (Depth m.).
2) Non decompression time (No Deco min.).
3) Max depth reached (Max m.).
4) Elapsed dive time (Dive.T min.).
5) Ascent rate indicator.
6) Indicator of altitude level (if set)
7) Current temperature, expressed in °C or °F.
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Additional important information may be obtained by pressing the button during the dive:
1) Maximum PO2 set.
2) Oxygen percentage of the selected mixture
(Air if FO2=21%);
3) Maximum depth which can be reached depending on the maximum PO2 set.
4) Safety Factor SF.
DIVE NITROX FUNCTION: Dive with
Nitrox (im. 15)
The Leonardo computer keeps the setting of
the percentage of Oxygen Fo2, until the diver
manually resets it to different values. It is important to understand that:
Artificial respiratory mixtures may expose the diver to significant risks, unless
they are perfectly known, analysed and
studied. It is mandatory to understand
that THE MIXTURE BEING BREATHED
MUST BE EXACTLY EQUAL TO THE
ONE SET ON THE COMPUTER. OTHERWISE, DECOMPRESSION AND TOXICITY INFORMATION provided by the
computer WILL BE DANGEROUS FOR
THE LIFE OF THE DIVER. Before, after,
and during a Nitrox dive, it is mandatory
to verify the percentage of the Oxygen so
that it exactly corresponds to the one in
the cylinder.
BEFORE A NITROX DIVE.
The Leonardo computer always keeps the DIVE
AIR program switched on, until the diver sets it
for the use with Nitrox mixtures (chapter DIVESET MODE: Dive parameters setting). In this
case the display will show the Nitrox icon (picture 15) which will stay on during the dive and
until Leonardo remains set on Nitrox parameters. Once the Nitrox program is on, it is neces-
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38
sary to set the computer with the exact values of
oxygen percentage (FO2) contained in the cylinder to be used during the dive, after having
meticulously analysed its content, so the computer is able to adapt its computing algorithm according to the new parameters..
DANGER: the use of the computer
with hyper-oxygenated (nitrox) mixtures is exclusively intended for divers
who have attended a full training course
on the use of such mixtures.
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WHILE DIVING
AIR
(im. 14)
PRESS
PRESS
AND
HOLD
PRE DIVE
LIGHT
AUTOMATIC
RETURN
NITROX
(im. 15)
PRESS
PRE DIVE
PRESS
AND
HOLD
LIGHT
AUTOMATIC
RETURN
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DANGER: Do not dive with cylinders
containing Nitrox mixtures without
checking their oxygen percentage.
WARNING: : Check the FO2 value
set on the computer prior to diving!
This is done on surface by means of the
main screen PRE-DIVE and the DIVE SET
screen which allow visualization of the previously set parameters.
WARNING: Under the same dive conditions, a Nitrox mixture requires longer no
decompression times than air. It is recommended to comply with the maximum
depth allowed by the selected Nitrox mixture.
DIVING WITH NITROX
During a Nitrox dive within the no decompression limits, all the information related to the a
standard dive with air will be provided, as well as
(picture 16):
1) NITROX dive indicator
2) Graph representing CNS O2 toxicity level
The second screen, after pressing the button,
displays the same settings as the DIVE AIR but,
of course, concerning the nitrox mixture used.
CNS TOXICITY DISPLAY
The Leonardo Cressi computer is able to display
a graph of the oxygen toxicity level for the Central Nervous System. The toxicity level is related to the partial oxygen pressure and to the
time of the diver's exposure to high partial oxygen pressure (PO2). The picture 16 represents
the display column, consisting of a 5-segment
bar, which shows the increasing amount of accumulated oxygen. When all the segments are
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41
lit up, 100% of the maximum tolerance allowable to the CNS has occurred and serious danger
of hyperoxia exists.
NOTE: The result of the oxygen exposure
computation is approximated to the nearest whole number.
It is important to understand, monitor, and control the oxygen toxicity level. In order to reduce
the risk of oxygen toxicity, Leonardo displays a
graphic bar, easy to read in any situation. When
the oxygen level reaches warning values, next to
the maximum allowable toxicity (corresponding
to 5 segments out of 5 lit up), the graph starts
flashing along with the Nitrox writing, and a temporary alarm starts sounding, showing the proximity of a CNS toxicity level. If the situation
remains unchanged or worsens (100% of allowable toxicity), the bar and the writing continue
to flash and the temporary sound alarm is repeated until, ascending, the partial oxygen pressure decreases below 0.6 atmospheres. The
graph stops flashing, yet the alarm is entered in
the Logbook.
DANGER: do not use hyper-oxygenated mixtures in diving or decompression without having attended the
related training courses. The Nitrox
Basic license enables to use just the
standard hyper-oxygenated mixtures
(Ean 32 and Ean 36, respectively called
Nitrox 1 and Nitrox 2), within the non
decompression limits.
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CNS TOXICITY DISPLAY
(im. 16)
PRESS
PRE DIVE
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PO2 ALARM (im. 17)
The computer is able to constantly monitor
another basic parameter relating to oxygen,
that is O2 partial pressure value (PO2). Oxygen toxicity may be caused both by an excessive exposure (CNS toxicity, seen in the
previous chapter) and by exceeding the maximum Po2, which is exceeding the maximum
depth allowed by the mixture used. As already
seen, the PO2 limit value is set by the diver in
a range between 1.2 bar and 1.6 bar. Leonardo
considers the 1.6 bar value as the partial pressure maximum allowable limit and, according
to the used mixture, automatically signals the
maximum depth which may be reached. Remember that even by using air, you may reach
the oxygen toxicity limit. Such limit varies according to the set PO2. Leonardo is manufactured with a preset value of 1.4 bar, whose
corresponding maximum depth is 188 ft. in air.
It is possible to set the computer on other PO2
values, up to a maximum of 1.6 bar. To warn
the diver about the excess of Po2, when reaching the limit depth relating to the set PO2
(1.2 bar to 1.6 bar), a sound alarm will start
while the Po2 icon will be flashing, indicating
the current depth. As soon as you return to a
depth shallower than the limit one, the sound
alarm stops, current depth and the Po2 icon
stop flashing. The latter icon remains lit up during the residual part of the dive, in the LOG
BOOK and in the PRE DIVE screen.
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PO2 ALARM
(im. 17)
PRESS
PRE DIVE
LOG BOOK
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7)
ASCENT RATE (im. 18)
SAFETY STOP. (im 19)
The ascent rate is shown on the display by an
arrow indicator at the centre, operating according to the table on the picture 18: If, during surfacing, the maximum allowed ascent
rate is exceeded, the display will show three
arrows, showing the increasing level of the ascent rate. Additionally, the alarm will sound,
the SLOW icon will flash, as well as the arrow
indicator. In this situation, surfacing must be
stopped until the SLOW icon disappears and
the display returns to standard conditions.
Leonardo is programmed to automatically signal a safety stop after each dive at a depth
greater than 32 ft., as recommended by the
training centres and the most recent studies on
diving physiology. A 3 minute stop should be
carried out at a depth between 20 ft. - 10 ft..
DANGER: Surfacing too fast dramatically increases the risk of decompression sickness. Cressi recommends, at
the end of each dive, a safety stop of 3
minutes at 10 ft– 20 ft., which will be
assisted by the computer (see next
chapter).
The stop is indicated by the display with the
STOP icon; the display, in this condition, clearly indicates the duration in minutes of the
stop and the depth in meters or feet. The
safety stop is not mandatory, yet it is strongly
recommended if, for instance, the maximum
ascent rate is repeatedly exceeded. Cressi always recommends to respect it, in order to
avoid safety issues.
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NOTE: During the safety stop, the maximum depth can be displayed pressing the
button.
DANGER: At the end of the safety
stop, many divers use to quickly reach
the surface, sometimes even inflating
the Buoyancy Control Device. It is a
very severe error which may lead to
decompression sickness. The last meters before surface in fact are the most
critical and the percentage variations
of the pressure are significant. The last
section of the ascent to surface in fact
should be covered in no less than a minute.
DECOMPRESSION FOREWARNING (im. 20)
Every time the time available within the curve,
shown on the display by the NO DECO icon,
decreases to 3 minutes, Leonardo warns the
diver. The digit with the remaining minutes and
the NO DECO icon flash and a sound alarm is
issued. It means that the diver is approaching
the no decompression limits. A decompression
is required.
DEEP STOP. (im. 21)
In order to avoid the risks related to the microbubbles forming during the ascent, Leonardo is able to suggest a DEEP STOP of 1 - 2
minutes (in case of dive with decompression)
at variable depth depending on the dive profile. During the dive, if the profile requires it,
DEEP STOP is displayed and an acoustic signal
is issued. The stop icon with the depth and the
time in minutes is displayed.
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If the diver omits it, the warnings will be deleted and the computer recalculates ascent planning without that stop.
NOTE: verify that the deep stop is enabled (see the paragraph at page 22).
NOTE: In this case, the maximum depth
can be displayed pressing the button.
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ASCENT RATE
(im. 18)
DEPTH
NO SIGNAL
0.0-3.9 m/min 4.0-7.9 m/min 8.0-11.9 m/min
12.0 m/min
SAFETY STOP
(im. 19)
PRESS
PRESS
AND
HOLD
LIGHT
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DECOMPRESSION FOREWARNING
)
(im. 20)
DEEP STOP
(im. 21)
PRESS
PRESS
AND
HOLD
LIGHT
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DIVING OUTSIDE THE NO DECOMPRESSION LIMITS (im. 22)
DANGER: Do not use this instrument to dive beyond the no decompression limits! Cressi discourages the
use of this instrument for decompression dives.
In the event that you have exceeded the no decompression limits, Leonardo will assist with
specific information related to surfacing and related decompression information.
Upon violating the no decompression limits,
the computer will issue a sound alarm, and the
display changes as in the figure 22, providing
the diver with the following information:
1) Stop icon with the writing DECO, showing
that the no decompression limits have been
violated and that decompression stops must be
performed. The arrow indicating UP flashes.
2) Depth of first decompression stage (the
deepest), given in meters (m) or feet (ft.). It
may vary from a maximum of 78 ft. to a minimum of 10 ft., by steps of 10 ft..
3) Time in minutes for the first decompression
stage (the deepest).
4) TOTAL icon, indicating the total ascent time,
that is the time required to ascend to the
deepest stage, respecting the ascent rate,
PLUS the stop time at that depth and at any
other subsequent stop (including the deep
stop if necessary), PLUS the safety stop time,
PLUS the time required to reach the surface
after completing the decompression stages.
5) “DIVE. T” icon giving the total time spent
while diving.
NOTE: In this case, the maximum depth
can be displayed pressing the button.
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DANGER: NEVER ascend above a decompression depth. To avoid this situation, you should ascend to a depth slightly
deeper than the stage decompression
depth requirement. You should consider
the amount of gas needed to successfully
complete all decompression requirements.
During rough sea conditions, it may be difficult to comply with the decompression
stage requirements without exceeding it.
Cressi recommends that the shallowest
depth (nearest the surface) be at depth of
about 20 ft., even though decompression
will take slightly longer. Leonardo will automatically calculate this.
Omitted Decompression stage alarm
(im. 23)
If the decompression stage is missed by surfacing above the depth given by the computer,
an alarm will sound and the down arrow of the
decompression icon will flash on the display
until the diver descends back to the proper
depth or below it. In the opposite case, that is
when the diver goes below under the stage
depth by a specific amount, an arrow flashes,
indicating that it is necessary to go up. The
computer allows a maximum time of 2 minutes to correct this dangerous situation; during
this time, the alarm will keep sounding. In the
event that the diver does not descend to the
proper depth (after 2 minutes) Leonardo enters the ERROR PROGRAM. The “STOP” icon
flashes and the instrument won’t be usable for
the next 48 hours. The only functions working
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will be Logbook and History. Later, in the PRE
DIVE screen the “STOP” icon, the DECO writing and the stop icon with the up arrow flash.
This means that the decompression stage has
been omitted during the last dive. The LOG
BOOK will store the same warning, indicating
that in a specific date the dive with a specific
number has been carried out without the decompression stage.
DANGER: Should this happen, you
must not dive for the next 48 hours. In
the event that you feel any symptoms of decompression sickness, you should contact the
DAN (Divers Alert Network) and your local
hyperbaric chamber centre, providing as
much data as possible about the dive.
GAGE FUNCTION
(depth gauge/timer). (im. 24)
The Leonardo computer is equipped with a
third dive computing program (GAGE). This
function is especially useful for technical dives,
yet it is useful as well for apnea (free diving).
When the Gage function is enabled, Leonardo
does not perform any saturation and de-saturation computation. It only operates as a basic
instrument indicating dive depth and time, as
well as some accessory data. In this condition,
proper decompression software must be utilized according to proper dive tables. Cressi reminds you that sport dives must be carried out
within the no decompression guidelines, and at
the maximum depth of 132 ft., which is the
limit of sport diving: to exceed such limits dramatically increases the risk of decompression
sickness!
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DECOMPRESSION WARNING
AIR
(im. 22)
PRESS
PRESS
AND
HOLD
LIGHT
NITROX
PRESS
PRESS
AND
HOLD
LIGHT
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OMITTED DECOMPRESSION STAGE ALARM
(im. 23)
Deco depth not respected:
lower depth.
PRE DIVE
Deco depth not respected:
upper depth.
LOG BOOK
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WARNING: Leonardo is designed for
sport diving only. It is not intended for commercial or professional use, requiring longer
dive times and greater depths. Diving beyond
the parameters of sport diving dramatically
increases the risk of decompression sickness.
DANGER: Cressi discourages diving
with gaseous mixtures other than air
without proper training. The use of
“technical” multi-gas mixtures may expose the diver to different risks than
those of sport diving, including serious
physical damages and, in extreme
cases, death.
If the GAGE function is enabled, the computer,
if it has not been switched on with the button,
automatically activates at depths below 4 ft. showing the following information on the display:
1) current depth value, in meters (m) or feet
(ft.) The depth gauge operative range reaches a depth of 393 ft.
2) dive time, shown by the “DIVE T" icon,
given by the timer in minutes and seconds.
3) maximum depth reached during the dive,
displayed in meters (m) or in feet (ft.),
shown by the “MAX” icon.
4) indicator of ascent rate (arrows).
5) GAGE computing program icon.
6) current temperature, expressed in °C or °F
7) battery state.
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WARNING: The computer will not
perform any saturation and de-saturation
computation during the remaining 48 hours
elapsing from the end of the dive performed with the GAGE function.
DANGER: Should you decide to
reset the instrument, the nitrogen memory will be cancelled. Therefore, the
instrument will not be able to compute
a subsequent dive as such. Before using
this function, wait for at least 48 hours
after the last diving activity.
USE OF THE COMPUTER WITH POOR
VISIBILITY (im. 25)
During your diving activity, light condition may
not allow easy reading of the display, therefore,
it is possible to switch on its backlight by pressing and holding the button. The display’s backlight lasts for a few seconds, then automatically
switches off.
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GAGE FUNCTION
(im. 24)
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BACKLIGHT WHILE DIVING
AIR
(im. 25)
PRESS
AND
HOLD
LIGHT
NITROX
PRESS
AND
HOLD
LIGHT
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4 - ON SURFACE AFTER DIVING
DATA DISPLAY AND MANAGEMENT
)
This chapter deals with all the “on surface” functions, including data processing after a dive with
DIVE AIR, DIVE NITROX or GAGE function. By
repeatedly pressing the button, it is possible to
activate the following functions: LOGBOOK
(dive log), HISTORY (dive history) and PCLINK
(Data transfer to PC by means of interface).
SURFACE INTERVAL. (im. 26)
After a dive with DIVE AIR or DIVE NITROX,
when you reach depths above 4 ft., the display
provides the following information:
1) Surface interval given in hours and minutes
(SURF.T)
2) Desaturation time (DESAT) to be respected
before embarking on a flight (in hours and
minutes).
2) NO FLY icon. It means that flights or travel
to higher altitudes than the current altitude
must be avoided, until the icon disappears.
3) Max depth reached in the latest dive.
4) Duration of the latest dive.
5) Alarms (if any) issued during dive (ascent
rate, partial pressure of the oxygen)
6) Indication of the altitude (if applicable).
7) DECO indication (if applicable).
8) Nitrox indication and O2 toxicity bar if the
latest dive has used Nitrox
WARNING: Following the indications
of the major organizations which study diving and hyperbaric medicine, Leonardo applies the no flight times as follows: 12 hours
after a single dive without decompression.
24 hours after a dive with decompression
or after repetitive or multiday, if correctly
performed.
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48 hours after the use of the gage function
or if severe mistakes in dive management
occurred.
NOTE: Should a dive begin with less than 2
minutes of surface interval time, Leonardo
will consider this a continuation of the previous dive; the dive’s count and dive time
computation will restart from where they
had stopped. Dives carried out after at least
2 minutes of surface are considered as a
new dive. The computer will not perform
any saturation and de-saturation computation during the 48 hours (represented by
the surface interval SURF.T.) elapsing from
the end of the dive performed with the
GAGE function.
PLAN FUNCTION - DIVE PLANNING. (im. 27)
The PLAN function takes into account the residual nitrogen in the tissues after the dive/s
performed, changing the curve times and making them shorter than those indicated for the
first dive.
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NOTE: The PLAN function will be switched off in GAGE function (depth
gauge/timer) and if the computer shows
“error”. After de-saturation, the computer
switches off.
automatically returns to the main screen. Press
the button to extend the display time.
(im. 28 - 29)
The LOGBOOK function enables to display, in
two separate screens, a full range of information relating to the dives, starting with the most
recent dive in chronological order. The main
screen displays the following information:
Leonardo by Cressi stores data about the latest 60 dives or 70 hours elapsed with the
functions DIVE AIR, DIVE NITROX and
GAGE. Data is recorded every 20 seconds in
the LOG BOOK (dive log), which is activated
on the surface by repeatedly pressing the button until the LOG icon is displayed. The latest
dive will be displayed. To display the previous
dives, press and hold until the dive number
flashes. Then press the button to reach the desired dive. To display the second screen of the
dive, press and hold the button. Data will be
displayed for 20 seconds, then the computer
• Dive's year, month, and day.
• Dive number: the most recent dive’s information are given first. When more than 60
dives are carried out, the oldest dives are deleted.
• Maximum depth reached during the dive
(MAX).
• Total time of the dive in minutes (DIVE.T).
•Decompression dive (DECO).
• Indication of the altitude level of the dive.
• The NITROX icon will appear when a dive with
enriched oxygen mixture has been carried out.
LOG BOOK FUNCTION - DIVE LOG
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• Indicator of CNS O2 toxicity at the end of a
dive with program DIVE AIR or DIVE NITROX.
• The display will display all icons relating to the
alarms which have possibly engaged during
the dive, such as: PO2 (PO2 alarm), SLOW
(maximum ascent rate alarm) and so on.
• To display the second screen of the Logbook,
press and hold the button. It displays the following data (im. 28-29).
• Dive’s starting time (the time when the computer has gone below 4 ft.), activating the
function relating to the set computing program ("DIVE" or “GAGE”);
• Mixture used for the dive with the function
DIVE AIR or DIVE NITROX: if an air dive, AIR
will appear, if a Nitrox mixture dive, the display shows respectively FO2 and NITROX.
• Water temperature.
• Safety Factor (SF 0-1-2).
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SURFACE INTERVAL
AIR
(im. 26)
PRESS
AND
HOLD
LIGHT
NITROX
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PLAN FUNCTION
PRESS
PRESS
AND
HOLD
PRIMARY MENU
(im. 27)
PRESS
SECONDARY MENU
PRESS
SECONDARY MENU
PRESS
AUTOMATIC
RETURN
SECONDARY MENU
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)
HISTORY FUNCTION - DIVE HISTORY (im. 30)
DIVE PROFILE FUNCTION - DIVE
PROFILE
The computer is equipped with a dive history
memory for DIVE AIR, DIVE NITROX, and
GAGE dives. To access this function, repeatedly
press the button until the HISTORY icon appears. The program will display the following information:
• Total time of all dives carried out, in hours
(DIVE T.-h.)
• Maximum depth reached during all dives.
• Total number of dives (DIVE TOTAL).
The function is able to store up to 999 dives,
after which it will reset the counter and restart
from zero.
The detailed profile of the dives can be viewed
by means of the software of the interface. A PC
(Desktop or Notebook) is required. The display
will automatically show any information relating
to depth, time and decompression of the most
recent dive stored in the logbook, therefore allowing to scan the dive’s profile in detail. The
data interval is 20 sec.
The display shows as well all the icons relating
any alarm activated during the dive, such as:
PO2 (PO2 alarm), SLOW (maximum ascent
rate alarm), and so on.
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PCLINK FUNCTION - PC COMPATIBLE INTERFACE
Using the PC link function with the PC button,
the Cressi Leonardo connects with your personal computer using an interface that you may
purchase as a separate accessory. The interface
will allow you to download and print all available data from your Leonardo, including dive
profiles, and with this, you can modify the data
using the dive simulator feature.
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LOG BOOK
AIR
PRESS
PRESS
AND
HOLD
PRIMARY MENU
PRESS
AND
HOLD
PRESS
SECONDARY MENU
SECONDARY MENU
after 20 sec.
SECONDARY MENU
AUTOMATIC
RETURN
after 20 sec.
(im. 28)
after 20 sec.
TERTIARY MENU
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NITROX
PRESS
PRESS
AND
HOLD
PRIMARY MENU
(im. 29)
PRESS
AND
HOLD
SECONDARY MENU
PRIMARY MENU
TERTIARY MENU
AUTOMATIC
RETURN
after 20 sec.
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HISTORY
PCLINK
(im. 30)
PRESS
PRESS
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SYSTEM RESET - RESET OF THE INSTRUMENT
By resetting the instrument, all the computations related to the current de-saturation are
reset. Dive logbook, profile and history remain
stored in the memory even after the instrument’s reset. The settings return to the factory
default. Such function may be especially useful in
case of instrument’s renting by Diving Centres.
DANGER: Do not reset your instrument if it has to be used to compute
subsequent dives!
The procedure to perform this operation
has already been explained in the chapter
“Before diving”.
5 - CARE AND MAINTENANCE.
Leonardo by Cressi has been designed to operate in extreme conditions with extensive underwater use. You should remember that it is a
precision instrument deserving appropriate
care. Please avoid any violent shock, protect it
from extreme heat sources, always wash it in
fresh water after using, dry it carefully, do not
store it wet, and avoid contact with heavy
equipment, like diving cylinders.
WARNING: avoid contact between the
computer and solvents or chemical substances. Do not use compressed air to dry
the computer. The button does not need
any particular care; never grease with oil or
spray of any kind.
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NOTE: When replacing the battery, check
its housing; should any signs of moisture be
visible, please have the instrument checked
by an authorized service centre.
Should you notice any anomaly in functioning, do not use the instrument to dive and
have it checked by an authorized Cressi retailer.
BATTERY REPLACEMENT. (im. 31)
Replacing the battery is easily done by the consumer, not requiring special service. It must be
done any time the instrument’s display shows
the run-down battery symbol.
WARNING: by replacing the battery, all
information relating to de-saturation, time
and date will be cancelled. Reset the time
and date, in order to get correct entries in
your computer’s logbook. Please do not replace the battery when de-saturation is in
progress, since all information relating to
de-saturation computing would be cancelled. In this case, please check the amount
of de-saturation hours and do not dive after
battery replacement during a corresponding amount of hours. After battery replacement, all settings go back to the latest
value set by the user. Time and date must
be reset.
To replace the battery, unscrew the battery
cover on the back of the instrument, using a
coin. Remove the lid and check the battery
and its housing. Should you note traces of
corrosion due to water entry, have the instrument checked by an authorized Cressi
retailer. If everything appears in good condition, remove the battery from its housing by
holding the computer face down. Replace
the battery complying with its polarity (an incorrect polarity may damage the instru-
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72
ment). Before closing the cover, check that
there is no soiling on its seat and apply a thin
layer of silicone grease to battery cover seal.
NOTE: Different factors affect the battery
life. For example: time of storage before acquiring the instrument, dive time, use of backlight, battery’s quality (whose average life
depends on temperature and other factors).
NOTE: Do not over tighten the battery
cover! Over tightening of the cover does
not create a better seal; to the contrary, it
can result in cracking of the cover or difficulty in removing the cover in the future.
NOTE: Make sure that the instrument is
watertight!
WARNING: Any anomaly or water infiltration due to incorrect battery replacement will void the warranty.
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RUN-DOWN BATTERY WARNING
(im. 31)
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6 - TECHNICAL SPECIFICATIONS.
Algorithm: CRESSI RGBM algorithm.
Sample tissues: 9 with saturation hemi-phases between 2.5 and 480 minutes
Dimensions and weight: Diameter: 67 mm Height: 27 mm - Weight: 135 g
Depth sensor:
- Sea water setting (fresh water depths are
about 3% lower)
- Measuring field: 0-393 ft., measured every second.
- GAGE function measuring field: 0-393 ft.
- Precision: +/- 1% (T 20°C – 68 F).
- Reading resolution: 10 cm (0 to 100 m) / 1 m
(100 to 120 m) / 1 ft (0 to 316 ft)
- Dive time: 0 to 255 minutes
- Data acquisition frequency: 20 sec.
THERMOMETER:
- Resolution: 1 °F
- Measuring field: 23 °F + 104 °F
- Precision: +/- 35.6 °F/10min change °T
WATCH:
- Precision: +/- 50 seconds month average
- 24 hours display
BATTERY:
CR 2430 - 3V battery. 2 years average life (by
50 yearly dives).
NOTE: Different factors affect the battery
average life. For example: time of storage
before acquiring the instrument, dive time,
use of back-illumination, battery’s quality itself (whose average life varies according to
temperature).
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7 - WARRANTY.
CRESSI LIMITED WARRANTY FOR
CRESSI UNDERWATER COMPUTERS
AND RELATED ACCESSORIES
Important notice: this warranty does not limit
the statutory rights granted to the consumer by
the applicable National Laws concerning the
sales of consumer products.
Cressi provides this limited warranty to the purchaser of the Cressi underwater computer and
of the related accessories (product).
During the warranty period, Cressi, or a Cressi
authorized service centre, according to their exclusive judgement, will remove any defect in
terms of material, design and workmanship,
free of charge, by means of repair or replacement of the product according to this limited
warranty.
This limited warranty is valid and effective exclusively in the country where the product has
been purchased, provided that Cressi has provided for the sale of the product in such country. However, in case of purchase of the product
in one of the member states of the European
Union, in Iceland, Norway, Switzerland and Turkey and if Cressi has originally foreseen the sale
of the product in one of these countries, this limited warranty is valid and effective in all these
countries.
Limitations to the service provided by this warranty could be caused by the presence in the
products of specific items for a country.
For countries not belonging to the European
Union, different from Iceland, Norway, Switzerland and Turkey, provided that the purchaser agrees to pay a service fee and a refund for
shipping expenses borne by Cressi or by a
Cressi authorized centre, it is possible to obtain
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the service foreseen by the warranty in country
different from that where the product has been
purchased. In that case, any spare part will be
provided free of charge.
Warranty period
The warranty period starts form the retail purchase date by the first purchaser.
The product can consist of several components
which may be covered by a different warranty
period, notably this limited warranty is valid for
a period of:
A) two years for underwater computers
B) one year for consumables and accessories, including, but not limited to, watchbands, buckles,
etc. (either in bundle with the underwater computer or sold separately).
Within the limits allowed by the applicable National Laws, the warranty period will not be extended or renewed or changed in any way following
a later resale, product repair or product replacement authorized by Cressi. However, the
parts of the product repaired or replaced during the warranty period, or the replaced product are warranted for the remaining original
warranty period or for three months from the
repair or replacement date, depending on
which period is longer.
How to avail of the warranty services
If you want to submit a claim according to this limited warranty, contact your Cressi authorized
dealer for information about claim submission; information will be provided about how to request
the application of the warranty to your product.
If you want to return the product by shipping it
to your authorized Cressi dealer, make sure that
shipping is prepaid.
The validity of the claims submitted according to
this limited warranty is subject to notification to
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Cressi or to a Cressi authorized service centre
of the alleged defect within a reasonable time
form its observation, however not beyond the
expiry of the warranty period.
For any claim, based on this limited warranty, it is
necessary as well to provide one's name and address, the purchase proof which shall clearly indicate the name and address of the seller, the date
and place of purchase and the type of product.
The request of repair under warranty will be satisfied free of charge by Cressi or by a Cressi authorized service centre, according to their
exclusive judgement, and the product will be repaired or replaced within a reasonable time.
If the product is deemed non compliant with the
terms and conditions of this limited warranty,
Cressi or a Cressi authorized service centre reserve the right to charge service and/or repair
costs.
Other important notes
In case of product repair or replacement, the
data and contents stored in it may get lost.
Cressi or a Cressi authorized service centre will
not be liable for any damage or loss of contents
or data during Product repair or replacement.
Cressi recommends to make back-ups or to
take written note of each important content or
data stored in the product.
The Product or part of it, when replaced, will
become property of Cressi. In case a refund is
granted, the related product must be returned
to a Cressi authorized service centre, since it becomes a property of Cressi and/or the Cressi
authorized centre.
In case of repair or replacement of the Product,
Cressi or a Cressi authorized service centre, can
use new, as new or repaired products or parts.
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Exclusions and limitations
This limited warranty does not cover:
1. a) product deterioration due to standard
wear, b) defects caused by improper use (including, but not limited to, defects caused by
sharp objects, bending, compression, fall,
shocks, etc.) c) defects or damages due to
improper use of the product, including use
non compliant with the instructions provided
by Cressi (e.g. those indicated in the instruction manual of the product) d) defects caused by other events not depending on Cressi;
2. user manuals or software by third parties
(even if included in the package or sold together with Cressi hardware), settings, contents or data, either provided with the
product or obtained by means of download
or provided together with installation, assembly, shipping or other stage of the supply
chain or otherwise purchased by the buyer;
3. defects or alleged defects caused by the use
or connection of the product, with any accessory, software e/o service not produced
or provided by Cressi or by using the product differently from the intended use;
4. replaceable batteries.
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This limited warranty is void in the following
cases:
1. if the Product has been opened, changed or
repaired by personnel not belonging to
Cressi or a Cressi service centre;
2. if the Product has been repaired using non
authorized spare parts;
3. if the Product has been exposed to chemical
substances such as (including, but not limited
to) insect repellents.
Cressi does not guarantee uninterrupted or
error free operation of the Product or that the
Product will operate in combination with other
hardware or software provided by third parties.
Limitation of Cressi liability
THIS LIMITED WARRANTY IS THE ONLY
AND EXCLUSIVE APPEAL INSTRUMENT
AVAILABLE FOR THE PURCHASER AND REPLACES ANY OTHER WARRANTY, EITHER
EXPLICIT OR IMPLICIT.
HOWEVER, THIS LIMITED WARRANTY
DOES NOT PREJUDICE THE RIGHTS
GRANTED BY THE APPLICABLE NATIONAL REGULATIONS. CRESSI SHALL NOT
BE LIABLE FOR SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES,
INCLUDING, BUT NOT LIMITED TO, LOSS
OF PROFITS OR FORESEEN BENEFITS,
LOSS OF SAVINGS OR INCOME, DATA
LOSS, PUNITIVE DAMAGES, UNSUCCESSFUL USE OF THE PRODUCT OR ASSOCIATED EQUIPMENT (IF ANY), COST OF THE
CAPITAL, COST OF THE REPLACEMENT
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EQUIPMENT
OR
STRUCTURES,
DOWNTIME, CLAIMS BY THIRD PARTIES,
INCLUDING CUSTOMERS AND DAMAGES
TO PROPERTIES CAUSED BY THE PURCHASE OR USE OF THE PRODUCT OR RESULTING FROM BREACH OF WARRANTY
OR CONTRACT, NEGLIGENCE, ABSOLUTE
RESPONSIBILITY OR OTHER LEGAL
MEANS, EVEN IF CRESSI KNEW THE PROBABILITY OF SUCH DAMAGES. CRESSI
SHALL NOT BE LIABLE FOR DELAYS IN
THE PROVISION OF THE SERVICE TO
WHICH THIS LIMITED WARRANTY REFERS
OR OF THE IMPOSSIBILITY OF USE DURING THE PRODUCT REPAIR PERIOD.
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Note:
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Via Gelasio Adamoli, 501 - 16165 - Genova - Italia
Tel. (0) 10/830.79.1 - Fax (0) 10/830.79.220
E.mail: info@cressi-sub.it
www.cressi.com
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