Cressi Leonardo User Manual
Direction for use
Computer Leonardo
ENGLISH
cressi.com
2
TABLE OF CONTENTS
Main specifications page 4
General recommendations
and safety measures page 5
Introduction page 10
1 - COMPUTER CONTROL
Operation of the Leonardo computer
page 13
2 - BEFORE DIVING
DIVE SET mode:
Setting of dive parameters
Oxygen partial pressure (PO2)
Nitrox - Percentage of the oxygen (FO2)
Dive Safety Factor (SF) page 22
Deep Stop page 22
Altitude page 23
PLAN mode:
Dive planning page 27
GAGE mode:
Depth gauge and timer page 27
page
page
page 18
TIME SET mode:
Date and time adjustment page 31
SYSTEM mode:
Setting of measurement unit and reset page 31
3 - WHILE DIVING: COMPUTER
FUNCTIONS
Diving within no decompression limits page 36
DIVE AIR function:
Dive with Air page 37
16
DIVE NITROX function:
16
Dive with Nitrox page 37
Before a Nitrox dive page 37
Diving with Nitrox page 40
CNS toxicity display page 40
PO2 alarm page 43
Ascent rate page 45
Safety Stop page 45
Decompression forewarning page 46
Deep Stop page 46
3
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 page 59
Surface interval page 59
PLAN function - Dive plan page 60
LOG BOOK function - Dive log page 61
HISTORY function - Dive history page 65
DIVE PROFILE function - Dive profile page 65
PCLINK function
Pc compatible interface page 66
System Reset
Reset of the instrument page 70
5 - CARE AND MAINTENANCE
Battery replacement page 71
6 - TECHNICAL SPECIFICATIONS
7 - WARRANTY
4
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.
5
• 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 instructi-
ons! 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-
6
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!
WARNING: this instrument should be
used only by properly trained and certified
divers. No computer will replace proper
underwater training. Please remember that
a dive’s safety is only guaranteed by a correct preparation.
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 compu-
ter, 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.
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
7
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 in-
strument 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.
9
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 con-
servative 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-
12
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.
PRE DIVE SCREENS PRE DIVE SCREENS
AIR NITROX
15
PRESS
AND
HOLD
PRE DIVE PRE DIVE
LIGHT LIGHT
(im. 1) (im. 2)
COMPUTER MENUS
(im. 3)
PRESS
AND
HOLD
16
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 PRESSURE
(PO2) (im. 4)
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
17
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 ma-
nufacturer 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)
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
(Fig. 5)
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.
NOTE: The Leonardo computer is factory
set on the DIVE AIR program, with the Nitrox mixture set to Fo2 at 21%.
SETTING OF PARTIAL OXYGEN PRESSURE - PO2
19
PRESS
PRESS PRESS
PRIMARY MENU SECONDARY MENU TERTIARY MENU TERTIARY MENU
AND
HOLD
PRESS
AND
HOLD
When the computer issues a sound signal, it means that the
setting has been stored, then it automatically goes back to
the previous menus.
(im. 4)
AUTOMATIC
RETURN
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SETTING OF NITROX FO2 MIXTURE
PRESS
PRESS
AND
HOLD
PRESS
PRESS
AND
HOLD
PRESS
PRIMARY MENU SECONDARY MENU TERTIARY MENU
SET THE DESIRED
PERCENTAGE
PRESS
AUTOMATIC
When the computer issues a sound si-
RETURN
WAIT FOR
3
SECONDS
gnal, it means that the setting has
been stored, then it automatically
goes back to the previous menus.
TERTIARY MENU
SECONDARY MENU
(im. 5)
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.
22
DIVE SAFETY FACTOR (SF)
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.
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.
(im. 6)
DEEP STOP
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.
(im. 7)
23
ALTITUDE
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
(im. 8)
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.
24
SAFETY FACTOR SETTING
PRESS
PRESS
PRIMARY MENU SECONDARY MENU SECONDARY MENU TERTIARY MENU
AND
HOLD
PRESS
PRESS PRESS
PRESS
AND
HOLD
TERTIARY MENU
WAIT FOR
3
SECONDS
(im. 6)
DEEP STOP ON/OFF
PRESS
PRESS PRESS PRESS
PRIMARY MENU SECONDARY MENU SECONDARY MENU TERTIARY MENU
AND
HOLD
PRESS
PRESS
AND
HOLD
25
TERTIARY MENU
WAIT FOR
3
SECONDS
(im. 7)
26
ALTITUDE SETTING
PRESS
PRESS PRESS PRESS
PRIMARY MENU SECONDARY MENU SECONDARY MENU TERTIARY MENU
AND
HOLD
PRESS
TERTIARY MENU
PRESS
AND
HOLD
WAIT FOR
SECONDS
3
(im. 8)
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