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Direction for useComputer Leonardo

cressi.comENGLISH

LEONARDO LIBRETTO 105X80 INGLESE:Layout 1 7-06-2011 10:10 Pagina 1

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Main specifications page 4General recommendations and safety measures page 5Introduction page 10

1 - COMPUTER CONTROLOperation of the Leonardo computer page 13

2 - BEFORE DIVINGDIVE SET mode: Setting of dive parameters page 16Oxygen partial pressure (PO2) page 16Nitrox - Percentage of the oxygen (FO2) page 18Dive Safety Factor (SF) page 22Deep Stop page 22Altitude page 23PLAN mode: Dive planning page 27GAGE mode: Depth gauge and timer page 27

TIME SET mode:Date and time adjustment page 31SYSTEM mode:Setting of measurement unit and reset page 31

3 - WHILE DIVING: COMPUTERFUNCTIONSDiving within no decompression limits page 36DIVE AIR function:Dive with Air page 37DIVE NITROX function:Dive with Nitrox page 37Before a Nitrox dive page 37Diving with Nitrox page 40CNS toxicity display page 40PO2 alarm page 43Ascent rate page 45Safety Stop page 45Decompression forewarning page 46Deep Stop page 46

TABLE OF CONTENTS


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Diving outside no decompression limits page 50Omitted Decompression stage alarm page 51GAGE MODEdepth gauge and timer) page 52Use of the computer withpoor visibility page 56

4 - ON SURFACE AFTER DIVINGData display and management page 59Surface interval page 59PLAN function - Dive plan page 60LOG BOOK function - Dive log page 61HISTORY function - Dive history page 65DIVE PROFILE function - Dive profile page 65PCLINK functionPc compatible interface page 66System ResetReset of the instrument page 70

5 - CARE AND MAINTENANCEBattery replacement page 71

6 - TECHNICAL SPECIFICATIONS

7 - WARRANTY


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Congratulations on your purchase of your Leo-nardo underwater computer, a sophisticatedand complete instrument, realized in order tooffer you the utmost safety, efficiency, and re-liability.

Always keep this manual with your Leonardo.

Main specifications.

• The Leonardo features a new Cressi RGBMagorithm, created in conjunction with theexpertise of Bruce Wienke and based onthe Haldane model, integrated with RGBMfactors. This algorithm allows for safe de-compression calculations for multiple divesspread out over multiple days.

• Tissues: 9 with saturation hemi-phases bet-ween 2.5 and 480 minutes;

• ”Dive” program: Full processing of divedata, even with decompression (if any), forany air or hyper-oxygenated mixture (Ni-

trox) dive.• Full setting of FO2 (percentage of the oxy-

gen) and PO2 (partial oxygen pressure) pa-rameters: PO2 may be set between 1.2 barand 1.6 bar, FO2 between 21% and 50%.

• A Nitrox dive may be carried out after anair dive (even with desaturation in pro-gress).

• Possibility of Deco (decompressive compu-tations) or Gage program setting (depthgauge and timer).

• Deep Stop can be enabled or disabled.• Large display with ”PCD System” for per-

fect 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 sy-

stem (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 ANDSAFETY MEASURES

� WARNING: please read the instructi-ons! Read carefully this handbook, includingthe safety measures paragraphs. Please besure of perfectly understanding your instru-ment’s use, functions and limits before usingit! DO NOT use your instrument withoutreading every part of this handbook!

� WARNING: this instrument is designedto be a dive aid and does not replace theuse of the dive tables.

� DANGER: AN UNDERWATER DI-VING COMPUTER CAN NEVERCOMPLETELY ELIMINATE THE RISKOF DECOMPRESSION SICKNESS(EMBOLISM). IT MUST BE CLEARTHAT AN UNDERWATER DIVINGCOMPUTER CAN NEVER COMPLE-TELY ELIMINATE THE RISK OF DE-COMPRESSION SICKNESS. IN FACT,THE COMPUTER CANNOT TAKEINTO ACCOUNT THE PHYSICALCONDITIONS OF THE DIVERWHICH MAY VARY DAILY. IT IS RE-COMMENDED THAT A MEDICAL EX-AMINATION IS COMPLETED PRIORTO COMMENCING ANY UNDERWA-TER DIVING ACTIVITY, AND TO AS-


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SESS ONE’S OWN PHYSICAL CON-DITION BEFORE EACH DIVE. CIR-CUMSTANCES SUCH AS COLDWATER TEMPERATURE (LESS THAN50F), POOR PHYSICAL CONDITION,MULTIPLE DIVES IN SUBSEQUENTDAYS, WEARINESS, USE OF ALCO-HOL, DRUGS, OR MEDICATIONAND DEHYDRATION MAY IN-CREASE THE RISK OF DECOMPRES-SION SICKNESS. PLEASE AVOID ALLTHESE SITUATIONS AS WELL ASANY OTHER THAT MIGHT ENDAN-GER YOUR LIFE: EVERYONE HAS TOBE RESPONSIBLE FOR ONE’S OWNSAFETY!

� WARNING: this instrument should beused only by properly trained and certifieddivers. No computer will replace properunderwater training. Please remember that

a dive’s safety is only guaranteed by a cor-rect preparation.

� WARNING: The Leonardo computerby Cressi is designed for sport diving only. Itis not intended for commercial or profes-sional use, requiring longer dive times andgreater depths. Diving beyond the parame-ters of sport diving dramatically increasesthe risk of decompression sickness.

� WARNING: Before using the compu-ter, please check the battery life status andthe visibility of the LCD display. DO NOTdive if the instruments’ indications are notperfectly clear and, first of all, if the batteryis low.

� WARNING: While diving, be equippedwith a depth gauge, a manometer, a divingtimer or watch and dive tables. Please alwayscheck your diving cylinders’ pressure to be fit


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to the planned dive and, while diving, oftencheck the cylinders’ air capacity by means ofyour manometer.

� DANGER: DO NOT DIVE AT HIGHALTITUDES BEFORE SETTING THECORRECT ALTITUDE. ONCE SET,PLEASE CHECK THE ALTITUDELEVEL ON THE DISPLAY. PLEASE RE-MEMBER THAT DIVING AT HIGHERALTITUDES THAN 9.842 FT. ABOVESEA LEVEL INVOLVES A REMARKA-BLE INCREASED RISK OF DECOM-PRESSION SICKNESS.

� DANGER: BEFORE EMBARKINGON A FLIGHT, PLEASE WAIT UNTILTHE ICON "NO FLY TIME" ON YOURCOMPUTER DISPLAY HAS DISAP-PEARED.

� WARNING: the present instrument’suse is strictly personal; the information itsupplies refer, in fact, exclusively to the in-dividual who has used it during a dive or aseries of dives.

� DANGER : CRESSI DOES NOT RE-COMMEND THE USE OF THIS IN-STRUMENT IN DECOMPRESSIONDIVES. IF, FOR ANY REASON, THE NODECOMPRESSION LIMITS HAVE BEENEXCEEDED, THE CRESSI COMPUTERWILL DISPLAY THE INFORMATIONRELATED TO DECOMPRESSION, SUR-FACING AND SURFACE INTERVALTIMES.


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� WARNING: Do not dive using Nitroxmixtures without checking the contents andcorrect O2 percentage (FO2). After doingso, set your computer with the mixture(s)’value so that it may process the decom-pression computations. Please be advisedthat the computer only accepts FO2 valuesto the nearest whole number.

� WARNING: Before diving, check in-strument parameter settings.

� DANGER: Leonardo always keepsthe latest oxygen setting set. It is veryimportant for diver's safety to alwayscheck this parameter before each dive.

� DANGER: CRESSI DISCOURAGESNITROX DIVES WITHOUT PROPERTRAINING. NITROX DIVES WILL EX-

POSE THE DIVER TO DIFFERENTRISKS THAN THOSE OF AIR DIVES,INCLUDING SERIOUS PHYSICALDAMAGES AND, IN EXTREMECASES, EVEN DEATH.

� DANGER: AS A SAFETY MEASURETHE COMPUTER UTILIZES A PO2 SETAT 1.4 BAR EVEN FOR AIR DIVES. IF ITIS NECESSARY TO INCREASE THESAFETY MARGIN, IT IS POSSIBLE TOSET PO2 TO LOWER VALUES, UP TO1.2 BAR, BY DECREMENTS OF 0.1 BAR.

� WARNING: after a dive with Leonardoset in Gage mode (depth gauge-timer), theinstrument will not make saturation and de-saturation computations during the subse-quent 48 hours.


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� WARNING: avoid any dive presentingvery risky profiles, such as "yo-yo" dives,dives with reversed profiles or several sub-sequent dives during subsequent days, sincethey are potentially dangerous and presenta higher risk of decompression sickness!

� WARNING: Currently, no validatedscientific literature allows to dive more thantwice a day for periods of one or more weekswithout the risk of decompression sickness.For your own safety, it is important to avoiddiving for more than two times a day.A rest of at least 2 hours between two sub-sequent dives is mandatory. The next/repeti-tive dive shall be shallower and its minimumduration shall be 15 minutes.

� WARNING: please utilize the most con-servative safety factor any time you areaware of factors that might increase the riskof decompression sickness. By doing so, youwill dive more conservatively and safety.

NOTE: while flying, the instrument mustbe stored in the pressurized cabin.

NOTE: Cressi reminds that all sport divesmust be conducted within the no decom-pression limits and at a maximum depth of132 ft, limit of sport dives. Exceeding theselimits dramatically increases the likelihoodof decompression sickness.


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As a result of technological advancements,Cressi reserves the right to modify the instru-ment without notification.

Introduction.

The Leonardo computer by Cressi is a multi-functional instrument for sport diving. It willsupply any wanted information on depth, divetimes, decompression status, ascent rate andsurface interval times between dives. Nitrogenabsorption and release is continuously proces-sed by its sophisticated software, taking intoaccount the quantity of inert in the differentmixtures which can be used. Such informationis displayed on the instrument’s large display,thanks to the PCD (Priority CompartmentDigit Display) System, allowing an easy and di-rect “dialogue” between the diver and thecomputer, ensuring a clear understanding of allthe data needed at any given time and a per-fect readability in any situation. The computeris provided with clock and calendar, a versatile


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dive memory (logbook), as well as a dive si-mulator. The mathematical model of Leonardocan make saturation and desaturation compu-tations of dives carried out both with air andwith Nitrox, whose parameters can all be set:from the maximum allowed PO2 value (bet-ween 1.2 bar and 1.6 bar), to the mixture’soxygen percentage (FO2) between 21% and50% of O2. Additionally, the instrument maybe set by the user for either metric (m-°C) orfeet system (ft-°F).

The Leonardo computer by Cressi is a multi-functional instrument for sport diving. It willsupply any wanted information on depth, divetimes, decompression status, ascent rate andsurface interval times between dives. Nitrogenabsorption and release is continuously proces-sed by its sophisticated software, taking intoaccount the quantity of inert in the differentmixtures which can be used. Such informationis displayed on the instrument’s large display,thanks to the PCD (Priority CompartmentDigit Display) System, allowing an easy and di-rect “dialogue” between the diver and thecomputer, ensuring a clear understanding of allthe data needed at any given time and a per-fect readability in any situation. The computeris provided with clock and calendar, a versatiledive memory (logbook), as well as a dive si-mulator. The mathematical model of Leonardocan make saturation and desaturation compu-


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tations of dives carried out both with air andwith Nitrox, whose parameters can all be set:from the maximum allowed PO2 value (bet-ween 1.2 bar and 1.6 bar), to the mixture’soxygen percentage (FO2) between 21% and50% of O2. Additionally, the instrument maybe set by the user for either metric (m-°C) orfeet system (ft-°F).

In order to understand all the computer’sfunctions and their meaning, the manual is di-vided into five main chapters, dealing withevery 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 LEONARDOCOMPUTERLeonardo is provided with a user friendly dis-play, which “escorts” the diver during any ope-ration. Leonardo’s screen different modeschange by repeatedly depressing the buttonwhich is the key to operating the system. Theyare clearly indicated by the alpha-numeric dis-play. The same button enables to access thesub-menus and to switch on back-lighting (onsea surface in PRE-DIVE mode only).

Pressing the button, Leonardo switches on andthe PRE DIVE screen is displayed. This screendisplays 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 withthe 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 browsethe main menu with 9 screen modes im. 3:

1) LOG-00: It is the logbook and the numbernext to “log” is the dive number.

2) DIVE-S: The purpose of Dive-set is to setthe dive parameters. In this mode it is pos-sible to set two of the three functions of theprogram of the computer, that is DIVE AIRand DIVE NITROX.

3) TIME-S: The purpose of Time-set is to setdate and time.


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4) PLAN: For dive planning5) GAGE: It is the third dive function of the

computer. It acts just as timer and depthgauge.

6) PCLINK: For the connection to a personalcomputer.

7) HISTORY: This mode displays dive history.8) SYSTEM: In system mode, it is possible to

set the measurement unit of the computerand a RESET can be performed.

9) PRE DIVE: In this mode, the time of theday is displayed on the bottom of thescreen (clock icon). It is the main screen ofthe computer.

To access the menu of these screens (ex-cept history and pclink) press and holdthe button. Pressing and releasing thebutton, it is possible to browse the dataof the menus. The computer automati-cally returns to the first screen of themenu.All the operations available for each mode ofthe display will be explained in this manual.


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PRE DIVE SCREENS PRE DIVE SCREENS

COMPUTER MENUS

AIR NITROX

PRESS AND HOLD

PRESS AND HOLD

(im. 1) (im. 2)

(im. 3)

LIGHT LIGHT

PRE DIVE PRE DIVE


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2 - BEFORE DIVINGDIVE-SET MODE: Setting of dive pa-rameters.Once switched on, the computer is in PREDIVE screen mode. The settings for the nextdive are displayed here. The parameters can bechanged by repeatedly pressing the button andaccessing the DIVE SET (DIVE-S) mode, whichenables 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 displaysthe battery icon with a single segmenton, the computer MUST NOT BEUSED. If it is displayed during a dive,stop the dive and return to the surface.The battery can be replaced by theuser (refer to the relevant chapter).

PARTIAL OXYGEN PRESSURE(PO2) (im. 4)

Leonardo is factory set with a Partial OxygenPressure (PO2) value of 1.4 bar for both airdives and Nitrox dives, in order to ensure themaximum safety during any type of dive. Ho-wever, it is possible to change the PO2 settingon values between 1.2 bar (included) and 1.6bar (included), with steps of 0.1 bar, obtainedeach time the button is pressed. If it is neces-sary to increase the safety margin of the dive, itis possible to set PO2 to lower values, up to a


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minimum of 1.2 bar. Just press the central but-ton up to the DIVE SET mode, displayed in thepicture 5, then press and hold the button toenter the mode. The indication of the partialoxygen pressure (PO2) will flash. Press and holdagain. The display shows just the highlighteditem, flashing. Change it by pressing again thebutton. Once the desired setting is reached (va-lues between 1.2 bar and 1.6 bar, with steps of0.1 bar) wait for a few seconds. The computerautomatically changes the settings, issuing asound signal and then returns to the mainscreen.

� WARNING: the computer maintainsthe PO2 setting until it is manually reset bythe diver on different values.

NOTE: by varying the maximum PO2 setand the percentage of oxygen in the FO2mixture, the computer indicates the maxi-mum 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. Thisway, the safety of the diver is ensured byfollowing the most conservative values re-commended for sport dives. However, it ispossible to select another value PO2 value,as indicated in the chapter related to Nitroxdives. The value set will be stored in thecomputer until the diver resets it.


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NITROX - PERCENTAGE OF THEOXYGEN (FO2) (Fig. 5)

With this setting, it is possible to decide thetype of dive: with air (Dive Air Program), withfraction of oxygen at 21%, or oxygen enriched(Dive Nitrox Program).

To set the correct percentage of the Oxygencontained in the Nitrox mixture, press thecentral button until you reach the DIVE SETmode. Press and hold the button to enter themode. The PO2 indication starts flashing. Pressagain the button. The indication of the fractionof Oxygen (FO2) starts flashing. Press and holdagain. The display shows just the highlighteditem, flashing. Change it by pressing again thebutton. Once the desired setting is reached(values between 21% and 50% with steps of

1% of O2) wait for a few seconds. The com-puter automatically changes the settings, is-suing a sound signal. Then it automaticallyreturns to the main screen.

NOTE: The Leonardo computer is factoryset on the DIVE AIR program, with the Ni-trox mixture set to Fo2 at 21%.

P


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SETTING OF PARTIAL OXYGEN PRESSURE - PO2

When the computer issues a sound signal, it means that thesetting has been stored, then it automatically goes back tothe previous menus.

PRESS AND HOLD

PRESS AND HOLD

PRESS PRESS

PRIMARY MENU SECONDARY MENU TERTIARY MENU TERTIARY MENU

AUTOMATIC RETURN

(im. 4)


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SETTING OF NITROX FO2 MIXTURE

When the computer issues a sound si-gnal, it means that the setting hasbeen stored, then it automaticallygoes back to the previous menus.

PRIMARY MENU SECONDARY MENU TERTIARY MENU

PRESS AND HOLD

PRESS

PRESS

PRESSPRESS AND HOLD

PRESS

AUTOMATIC RETURN

(im. 5)

TERTIARY MENUSET THE DESIRED

PERCENTAGE

PRIMARY MENUSECONDARY MENU

WAIT FOR 3

SECONDS


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NOTE: by varying the PO2 set, the com-puter indicates the maximum depth whichmay be reached with that mixture.

It is possible to change the setting of the Nitroxmixture also during the surface interval (withdesaturation in progress), but only after 2 mi-nutes from the start of the interval.

This is a very important feature, especially fordivers who perform a series of subsequentdives (for instance trainers), which enables tochange one's mixture after having dived, for in-stance, once with air, without having to waitfor complete desaturation.

� WARNING: Once the percentage ofoxygen FO2 has been set, it remains storedin the computer until it is changed again.

� DANGER: Leonardo always keepsthe latest oxygen setting set. It is veryimportant for diver's safety to alwayscheck this parameter before each dive.

� DANGER: If you dive again after aNitrox dive, it is fundamental for one'ssafety to check for the type of mixturecontained in the cylinder, setting theFo2 of the computer according to thatmixture.

� DANGER: Do not dive with cylinderscontaining nitrox mixtures whose per-centage of oxygen has not been perso-nally checked.


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DIVE SAFETY FACTOR (SF) (im. 6)

The Safety Factor is an additional parameterwhose purpose is to make dives safer based onthe existence of personal risk factors which in-crease the risk of decompression sickness. Thediver can set it on three values: SF0/SF1/SF2.The factory setting is SF0, i.e. disabled.

� WARNING: Enable and set a highersafety factor (SF2/SF3) whenever you areaware of conditions which may increase therisk of decompression sickness. This way,non decompression times will be shorterand the dive will be more conservative, en-suring a greater safety.

DEEP STOP (im. 7)

There are different diving teaching methodolo-gies and decompression theories. Each of thosehas been developed according to importantscientific concepts, lab tests and practical tests.Some of those, during specific dives, supportand require DEEP STOP, while others do notcontemplate this type of decompression pro-file. Leonardo is factory set on DEEP STOP. Ifyou want to disable it, just press the button untilyou reach the DIVE SET mode, press and holdto enter the mode, press to browse until DEEPSTOP flashes. Now press and hold until“Deepst” “ON” is displayed. Pressing, OFF isdisplayed and the arrow icon on the bottomright disappears. Deep Stop has been disabled.The computer automatically returns to themain menu.


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ALTITUDE (im. 8)

When diving at a location above sea level, it isimportant to check that the appropriate alti-tude has been set. Once entered the DIVE-Smenu, reach the parameter altitude “Alt. 0”. Adigit flashes next to Alt. Press and hold; thescreen shows the corresponding altitude levels,indicated with:

ALT. 0 (no mountain) - da 0 a 700 mALT. 1 (1 mountain) - da 700 a 1500 mALT. 2 (2 mountains) - da 1500 a 2400 mALT. 3 (3 mountains) - da 2400 a 3700 mEach icon indicates that the computer has au-tomatically changed its mathematical modeldepending on the altitude reached, providingreduced curve times with the increase of al-titude.In case of dive at an altitude higher than theone where the diver usually lives, the body

experiences alterations due to nitrogen over-saturation which must rebalance with the ex-ternal environment. It is important to remindthat, due to the lower partial pressure of theoxygen in the atmosphere, our body needsan acclimatization period. It is therefore re-commended to wait at least 12/24 hoursafter arriving at a location above sea level be-fore diving.

� DANGER: Leonardo does not auto-matically handle dives at a locationabove sea level. Thus, it is mandatoryto correctly set the altitude level andrespect the acclimatization period be-fore diving.

� DANGER: Diving at altitudesgreater than 9,842 ft. above sea levelinvolves an increased risk of decom-pression sickness.


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SAFETY FACTOR SETTING

PRESS AND HOLD

PRESS AND HOLD

PRESS

PRESS

PRESS PRESS

(im. 6)

PRIMARY MENU SECONDARY MENU SECONDARY MENU TERTIARY MENU

WAIT FOR 3

SECONDSTERTIARY MENU


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DEEP STOP ON/OFF

PRESS

PRESS AND HOLD

PRESS AND HOLD

PRESS PRESS PRESS

(im. 7)


WAIT FOR 3

SECONDSTERTIARY MENU


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ALTITUDE SETTING

PRESS AND HOLD

PRESS AND HOLD

PRESS PRESS PRESS


TERTIARY MENU(im. 8)

WAIT FOR 3

SECONDS

PRESS


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PLAN MODE: Dive planning (im. 9)

While on the surface, it is possible to go to thePLAN function in order to visualize, depen-ding on the mixture used (Nitrox or air) theremaining time available at different depths,without having to make decompression stops(safety curve). The values are given both forthe first of a (possible) series of dives and du-ring the surface interval between two or moresubsequent dives; in such case, Leonardo takesinto account the residual nitrogen, thereforereducing the times in the safety curve. To ac-cess the PLAN MODE, once the computer ison, press the button until PLAN is displayed.Pressing and holding the button it is possibleto access the function. The screen displays asafety curve (no decompression times) relatedto the different depths between 30 ft. and 157

ft, with manual steps of 10 ft., achieved bypressing the button. Wait for a few seconds toreturn to the main screen.

NOTE: the PLAN function will be switchedoff if the computer shows Error.

GAGE MODE: Depth gauge and timer(im. 10)

The computer is provided with a third pro-gram called GAGE (depth gauge and timer)that may be used for both apnea (free divers)divers and for the use in technical dives. In thiscase, the instrument provides just the divebasic parameters, i.e. depth and dive time. Itdoes not make tissue saturation and de-satu-ration computation, which must be program-med and computed by means of propersoftware and/or tables. Cressi reminds you


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that sport dives must be carried out within theno decompression guidelines, and at the ma-ximum depth of 132 ft., which is the limit ofsport diving: to exceed such limits dramaticallyincreases the risk of decompression sickness!

� WARNING: The Leonardo computeris designed for sport diving only. It is not in-tended for commercial or professional use,requiring longer dive times and greaterdepths. Diving beyond the parameters ofsport diving dramatically increases the riskof decompression sickness.

� DANGER: Cressi discourages divingwith gaseous mixtures other than air wit-hout proper training. The use of “techni-cal” multi-gas mixtures may expose thediver to different risks than those of sportdiving, including serious physical damagesand, in extreme cases, death.

� WARNING: After a dive in GAGEmode, the instrument will not make satu-ration and de-saturation computations forthe following 48 hours.

� DANGER: Should you decide toreset the instrument by accessing thesystem mode, the nitrogen memorywill be cancelled. Therefore, the in-strument will not be able to computethe following dive. Before using thisfunction, wait for at least 48 hoursafter the last diving activity.


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To access the GAGE program, press the but-ton until the “GAGE” screen is displayed, thenpress and hold the button until OFF flashes.Pressing again, OFF becomes ON, after a fewseconds the computer issues a sound and atthe same time the function is enabled.

PLAN mode is disabled.

NOTE: The Leonardo computer is factoryset on the “DIVE AIR” function.

NOTE: The depth indicator gives indicati-ons between 0 – 393 ft.


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PLAN MODE

GAGE MODE

PRIMARY MENU

PRIMARY MENU SECONDARY MENU SECONDARY MENU

SECONDARY MENU SECONDARY MENU SECONDARY MENU

PRESS AND HOLD

PRESS PRESS PRESS

PRESS AND HOLD

PRESS PRESS

(im. 9)

(im. 10)

WAIT FOR 3

SECONDS

WAIT FOR 3

SECONDS


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TIME SET MODEDate and time adjustment. (im. 11)

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 againto set month, day and 12/24 hours settings. Goto the desired setting. Press and hold again.The display shows just the highlighted item,flashing. Change it by pressing again the but-ton. Once the desired setting is reached, waitfor a few seconds. The computer automaticallychanges the settings, issuing a sound signal.Then it automatically returns to the mainscreen.

NOTE: To store exact information in thecomputer logbook, remember to check forcorrect time and date settings.

SYSTEM MODEUnits of measure setting (im.12)

The Leonardo computer can make computati-ons by metric units (depth in meters and tem-perature in °C), or in feet and temperature in°F. To change the unit of measurement, pressthe button up to the SYSTEM mode, thenpress and hold to enter the mode. “s.unit” (setunit) is displayed with the indication °C/m. or°F/ft. Press and hold. The indications start flas-hing. To change them, press and wait. Thecomputer stores the settings, issuing a soundsignal, then automatically returns to the mainscreen.

R

S


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Instrument reset. (im. 13)

To reset the instrument, press the button upto the SYSTEM mode, then press and hold toenter the mode. “s.unit” (set units) is displayedwith 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 dis-played. Press and hold. Wait for a sound signal.Dots and the writing “DONE!” are displayed.The instrument is reset. Then it automaticallyreturns to the main screen.

By resetting the instrument, all the computati-ons related to the current de-saturation arereset.

� DANGER: Do not reset your instru-ment if it has to be used to computesubsequent dives!


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TIME SET MODE

PRESS AND HOLD

PRESS PRESS PRESS AND HOLD

PRESS


PRESS

TERTIARY MENU SECONDARY MENU PRIMARY MENU

AUTOMATICRETURN

(im. 11)


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SYSTEM MODE: SETTING OF MEASUREMENT UNIT

AUTOMATICRETURN

PRESSPRESS AND HOLD

PRESS AND HOLD

(im. 12)PRESS

PRIMARY MENU


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SYSTEM MODE: INSTRUMENT RESET

) (im. 13)PRESS

PRESS AND HOLD

PRESS AND HOLD

PRESS

PRESSPRESS AND HOLD

PRESS AND HOLD

PRESS

PRESS

AUTOMATICRETURN


SECONDARY MENU


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WHILE DIVINGCOMPUTER FUNCTIONS (im. 14-15)

The computer can be set with three dif-ferent functions:

1) DIVE AIR if dives are performed with airand you want to use a decompression com-putation.

2) DIVE NITROX if dives are performedwith Nitrox and you want to use a decom-pression computation..

3) GAGE if you do not want to use a de-compression computation.

NOTE: The Leonardo computer is factoryset on the DIVE AIR program, with the mix-ture’s O2 value on 21% and PO2 on 1.4. FO2 values different from Air 21% activatethe computation program Dive Nitrox.

DIVING WITHIN NO DECOMPRES-SION LIMITSDIVE AIR function: Dive with air. (im. 14)

The Leonardo computer automatically startsthe DIVE AIR program at a depth exceeding3.93 ft.. During a dive within the no decom-pression limits, the display will show the follo-wing 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 ob-tained 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 de-pending on the maximum PO2 set.

4) Safety Factor SF.

DIVE NITROX FUNCTION: Dive withNitrox (im. 15)The Leonardo computer keeps the setting ofthe percentage of Oxygen Fo2, until the divermanually resets it to different values. It is im-portant to understand that:

Artificial respiratory mixtures may ex-pose the diver to significant risks, unlessthey are perfectly known, analysed andstudied. It is mandatory to understand

that THE MIXTURE BEING BREATHEDMUST BE EXACTLY EQUAL TO THEONE SET ON THE COMPUTER. OT-HERWISE, DECOMPRESSION AND TO-XICITY INFORMATION provided by thecomputer WILL BE DANGEROUS FORTHE LIFE OF THE DIVER. Before, after,and during a Nitrox dive, it is mandatoryto verify the percentage of the Oxygen sothat it exactly corresponds to the one inthe cylinder.

BEFORE A NITROX DIVE.The Leonardo computer always keeps the DIVEAIR program switched on, until the diver sets itfor the use with Nitrox mixtures (chapter DIVE-SET MODE: Dive parameters setting). In thiscase the display will show the Nitrox icon (pic-ture 15) which will stay on during the dive anduntil Leonardo remains set on Nitrox parame-ters. Once the Nitrox program is on, it is neces-


38

sary to set the computer with the exact values ofoxygen percentage (FO2) contained in the cy-linder to be used during the dive, after havingmeticulously analysed its content, so the com-puter is able to adapt its computing algorithm ac-cording to the new parameters..

� DANGER: the use of the computerwith hyper-oxygenated (nitrox) mixtu-res is exclusively intended for diverswho have attended a full training courseon the use of such mixtures.


39

NITROX

PRESS AND HOLD

PRESS

AIRWHILE DIVING

AUTOMATICRETURN

LIGHT

PRESS AND HOLD

LIGHT AUTOMATICRETURN

PRE DIVE

PRE DIVE

(im. 14)

(im. 15)

PRESS


40

� DANGER: Do not dive with cylinderscontaining Nitrox mixtures withoutchecking their oxygen percentage.

� WARNING: : Check the FO2 valueset on the computer prior to diving!This is done on surface by means of themain screen PRE-DIVE and the DIVE SETscreen which allow visualization of the pre-viously set parameters.

� WARNING: Under the same dive con-ditions, a Nitrox mixture requires longer nodecompression times than air. It is recom-mended to comply with the maximumdepth allowed by the selected Nitrox mix-ture.

DIVING WITH NITROX

During a Nitrox dive within the no decompres-sion limits, all the information related to the astandard dive with air will be provided, as well as(picture 16):1) NITROX dive indicator2) Graph representing CNS O2 toxicity levelThe 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 displaya graph of the oxygen toxicity level for the Cen-tral Nervous System. The toxicity level is rela-ted to the partial oxygen pressure and to thetime of the diver's exposure to high partial oxy-gen pressure (PO2). The picture 16 representsthe display column, consisting of a 5-segmentbar, which shows the increasing amount of ac-cumulated oxygen. When all the segments are


41

lit up, 100% of the maximum tolerance allowa-ble to the CNS has occurred and serious dangerof hyperoxia exists.

It is important to understand, monitor, and con-trol the oxygen toxicity level. In order to reducethe risk of oxygen toxicity, Leonardo displays agraphic bar, easy to read in any situation. Whenthe oxygen level reaches warning values, next tothe maximum allowable toxicity (correspondingto 5 segments out of 5 lit up), the graph startsflashing along with the Nitrox writing, and a tem-porary alarm starts sounding, showing the pro-ximity of a CNS toxicity level. If the situationremains unchanged or worsens (100% of allo-wable toxicity), the bar and the writing continueto flash and the temporary sound alarm is re-peated until, ascending, the partial oxygen pres-sure decreases below 0.6 atmospheres. Thegraph stops flashing, yet the alarm is entered inthe Logbook.

NOTE: The result of the oxygen exposurecomputation is approximated to the nea-rest whole number.

� DANGER: do not use hyper-oxyge-nated mixtures in diving or decom-pression without having attended therelated training courses. The NitroxBasic license enables to use just thestandard hyper-oxygenated mixtures(Ean 32 and Ean 36, respectively calledNitrox 1 and Nitrox 2), within the nondecompression limits.


(im. 16)

42

CNS TOXICITY DISPLAY

PRESS

PRE DIVE


PO2 ALARM (im. 17)

The computer is able to constantly monitoranother basic parameter relating to oxygen,that is O2 partial pressure value (PO2). Oxy-gen toxicity may be caused both by an exces-sive exposure (CNS toxicity, seen in theprevious chapter) and by exceeding the maxi-mum Po2, which is exceeding the maximumdepth allowed by the mixture used. As alreadyseen, the PO2 limit value is set by the diver ina range between 1.2 bar and 1.6 bar. Leonardoconsiders the 1.6 bar value as the partial pres-sure maximum allowable limit and, accordingto the used mixture, automatically signals themaximum depth which may be reached. Re-member that even by using air, you may reachthe oxygen toxicity limit. Such limit varies ac-cording to the set PO2. Leonardo is manufac-tured with a preset value of 1.4 bar, whosecorresponding maximum depth is 188 ft. in air.

It is possible to set the computer on other PO2values, up to a maximum of 1.6 bar. To warnthe diver about the excess of Po2, when rea-ching the limit depth relating to the set PO2(1.2 bar to 1.6 bar), a sound alarm will startwhile the Po2 icon will be flashing, indicatingthe current depth. As soon as you return to adepth shallower than the limit one, the soundalarm stops, current depth and the Po2 iconstop flashing. The latter icon remains lit up du-ring the residual part of the dive, in the LOGBOOK and in the PRE DIVE screen.

43


PO2 ALARM

PRESS

44

(im. 17)

PRE DIVE LOG BOOK


ASCENT RATE (im. 18)

The ascent rate is shown on the display by anarrow indicator at the centre, operating ac-cording to the table on the picture 18: If, du-ring surfacing, the maximum allowed ascentrate is exceeded, the display will show threearrows, showing the increasing level of the as-cent rate. Additionally, the alarm will sound,the SLOW icon will flash, as well as the arrowindicator. In this situation, surfacing must bestopped until the SLOW icon disappears andthe display returns to standard conditions.

� DANGER: Surfacing too fast drama-tically increases the risk of decompres-sion sickness. Cressi recommends, atthe end of each dive, a safety stop of 3minutes at 10 ft– 20 ft., which will beassisted by the computer (see nextchapter).

SAFETY STOP. (im 19)

Leonardo is programmed to automatically si-gnal a safety stop after each dive at a depthgreater than 32 ft., as recommended by thetraining centres and the most recent studies ondiving physiology. A 3 minute stop should becarried out at a depth between 20 ft. - 10 ft..

The stop is indicated by the display with theSTOP icon; the display, in this condition, cle-arly indicates the duration in minutes of thestop and the depth in meters or feet. Thesafety stop is not mandatory, yet it is stronglyrecommended if, for instance, the maximumascent rate is repeatedly exceeded. Cressi al-ways recommends to respect it, in order toavoid safety issues.

45

7)


NOTE: During the safety stop, the maxi-mum depth can be displayed pressing thebutton.

� DANGER: At the end of the safetystop, many divers use to quickly reachthe surface, sometimes even inflatingthe Buoyancy Control Device. It is avery severe error which may lead todecompression sickness. The last me-ters before surface in fact are the mostcritical and the percentage variationsof the pressure are significant. The lastsection of the ascent to surface in factshould be covered in no less than a mi-nute.

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 thediver. The digit with the remaining minutes andthe NO DECO icon flash and a sound alarm isissued. It means that the diver is approachingthe no decompression limits. A decompressionis required.

DEEP STOP. (im. 21)

In order to avoid the risks related to the mi-crobubbles forming during the ascent, Leo-nardo is able to suggest a DEEP STOP of 1 - 2minutes (in case of dive with decompression)at variable depth depending on the dive pro-file. During the dive, if the profile requires it,DEEP STOP is displayed and an acoustic signalis issued. The stop icon with the depth and thetime in minutes is displayed.

46


If the diver omits it, the warnings will be dele-ted and the computer recalculates ascent plan-ning without that stop.

NOTE: verify that the deep stop is enab-led (see the paragraph at page 22).

NOTE: In this case, the maximum depthcan be displayed pressing the button.

47


48

ASCENT RATE

SAFETY STOP

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

PRESS

PRESS AND HOLD

LIGHT

(im. 18)

(im. 19)


DEEP STOP

49

DECOMPRESSION FOREWARNING

PRESS

PRESS AND HOLD

LIGHT

) (im. 20)

(im. 21)


DIVING OUTSIDE THE NO DECOM-PRESSION LIMITS (im. 22)

� DANGER: Do not use this instru-ment to dive beyond the no decom-pression limits! Cressi discourages theuse of this instrument for decompres-sion dives.

In the event that you have exceeded the no de-compression limits, Leonardo will assist withspecific information related to surfacing and re-lated decompression information.Upon violating the no decompression limits,the computer will issue a sound alarm, and thedisplay changes as in the figure 22, providingthe diver with the following information:

1) Stop icon with the writing DECO, showingthat the no decompression limits have beenviolated and that decompression stops must beperformed. The arrow indicating UP flashes.

2) Depth of first decompression stage (thedeepest), given in meters (m) or feet (ft.). Itmay vary from a maximum of 78 ft. to a mi-nimum of 10 ft., by steps of 10 ft..

3) Time in minutes for the first decompressionstage (the deepest).

4) TOTAL icon, indicating the total ascent time,that is the time required to ascend to thedeepest stage, respecting the ascent rate,PLUS the stop time at that depth and at anyother subsequent stop (including the deepstop if necessary), PLUS the safety stop time,PLUS the time required to reach the surfaceafter completing the decompression stages.

5) “DIVE. T” icon giving the total time spentwhile diving.

NOTE: In this case, the maximum depthcan be displayed pressing the button.

50


� DANGER: NEVER ascend above a de-compression depth. To avoid this situa-tion, you should ascend to a depth slightlydeeper than the stage decompressiondepth requirement. You should considerthe amount of gas needed to successfullycomplete all decompression requirements.During rough sea conditions, it may be dif-ficult to comply with the decompressionstage requirements without exceeding it.Cressi recommends that the shallowestdepth (nearest the surface) be at depth ofabout 20 ft., even though decompressionwill take slightly longer. Leonardo will auto-matically calculate this.

Omitted Decompression stage alarm (im. 23)If the decompression stage is missed by surfa-cing above the depth given by the computer,an alarm will sound and the down arrow of thedecompression icon will flash on the displayuntil the diver descends back to the properdepth or below it. In the opposite case, that iswhen the diver goes below under the stagedepth by a specific amount, an arrow flashes,indicating that it is necessary to go up. Thecomputer allows a maximum time of 2 minu-tes to correct this dangerous situation; duringthis time, the alarm will keep sounding. In theevent that the diver does not descend to theproper depth (after 2 minutes) Leonardo en-ters the ERROR PROGRAM. The “STOP” iconflashes and the instrument won’t be usable forthe next 48 hours. The only functions working

51


will be Logbook and History. Later, in the PREDIVE screen the “STOP” icon, the DECO wri-ting and the stop icon with the up arrow flash.This means that the decompression stage hasbeen omitted during the last dive. The LOGBOOK will store the same warning, indicatingthat in a specific date the dive with a specificnumber has been carried out without the de-compression stage.

� DANGER: Should this happen, youmust not dive for the next 48 hours. Inthe event that you feel any symptoms of de-compression sickness, you should contact theDAN (Divers Alert Network) and your localhyperbaric chamber centre, providing asmuch data as possible about the dive.

GAGE FUNCTION(depth gauge/timer). (im. 24)

The Leonardo computer is equipped with athird dive computing program (GAGE). Thisfunction is especially useful for technical dives,yet it is useful as well for apnea (free diving). When the Gage function is enabled, Leonardodoes not perform any saturation and de-satu-ration computation. It only operates as a basicinstrument indicating dive depth and time, aswell as some accessory data. In this condition,proper decompression software must be utili-zed according to proper dive tables. Cressi re-minds you that sport dives must be carried outwithin the no decompression guidelines, and atthe maximum depth of 132 ft., which is thelimit of sport diving: to exceed such limits dra-matically increases the risk of decompressionsickness!

52


DECOMPRESSION WARNING

AIR

53

PRESS

PRESS

PRESS AND HOLD

LIGHT

PRESS AND HOLD

LIGHT

NITROX

(im. 22)


OMITTED DECOMPRESSION STAGE ALARM

54

(im. 23)

Deco depth not respected:lower depth.

Deco depth not respected:upper depth.

PRE DIVE LOG BOOK


� WARNING: Leonardo is designed forsport diving only. It is not intended for com-mercial or professional use, requiring longerdive times and greater depths. Diving beyondthe parameters of sport diving dramaticallyincreases the risk of decompression sickness.

� DANGER: Cressi discourages divingwith gaseous mixtures other than airwithout proper training. The use of“technical” multi-gas mixtures may ex-pose the diver to different risks thanthose of sport diving, including seriousphysical damages and, in extremecases, 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. sho-wing the following information on the display:1) current depth value, in meters (m) or feet

(ft.) The depth gauge operative range rea-ches 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 °F7) battery state.

55


� WARNING: The computer will notperform any saturation and de-saturationcomputation during the remaining 48 hourselapsing from the end of the dive perfor-med with the GAGE function.

� DANGER: Should you decide toreset the instrument, the nitrogen me-mory will be cancelled. Therefore, theinstrument will not be able to computea subsequent dive as such. Before usingthis function, wait for at least 48 hoursafter the last diving activity.

USE OF THE COMPUTER WITH POORVISIBILITY (im. 25)

During your diving activity, light condition maynot allow easy reading of the display, therefore,it is possible to switch on its backlight by pres-sing and holding the button. The display’s back-light lasts for a few seconds, then automaticallyswitches off.

56


57

GAGE FUNCTION(im. 24)


BACKLIGHT WHILE DIVING

AIR(im. 25)

PRESS AND HOLD

LIGHT

NITROX

58

PRESS AND HOLD

LIGHT


)

4 - ON SURFACE AFTER DIVINGDATA DISPLAY AND MANAGEMENT

This chapter deals with all the “on surface” functi-ons, including data processing after a dive withDIVE AIR, DIVE NITROX or GAGE function. Byrepeatedly pressing the button, it is possible toactivate 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 displayprovides the following information:

1) Surface interval given in hours and minutes(SURF.T)

2) Desaturation time (DESAT) to be respectedbefore embarking on a flight (in hours andminutes).

2) NO FLY icon. It means that flights or travelto higher altitudes than the current altitudemust 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 indicationsof the major organizations which study di-ving and hyperbaric medicine, Leonardo ap-plies the no flight times as follows: 12 hoursafter a single dive without decompression.24 hours after a dive with decompressionor after repetitive or multiday, if correctlyperformed.

59


48 hours after the use of the gage functionor if severe mistakes in dive managementoccurred.

NOTE: Should a dive begin with less than 2minutes of surface interval time, Leonardowill consider this a continuation of the pre-vious dive; the dive’s count and dive timecomputation will restart from where theyhad stopped. Dives carried out after at least2 minutes of surface are considered as anew dive. The computer will not performany saturation and de-saturation computa-tion during the 48 hours (represented bythe surface interval SURF.T.) elapsing fromthe end of the dive performed with theGAGE function.

PLAN FUNCTION - DIVE PLAN-NING. (im. 27)

The PLAN function takes into account the re-sidual nitrogen in the tissues after the dive/sperformed, changing the curve times and ma-king them shorter than those indicated for thefirst dive.

60


NOTE: The PLAN function will be swit-ched off in GAGE function (depthgauge/timer) and if the computer shows“error”. After de-saturation, the computerswitches off.

LOG BOOK FUNCTION - DIVE LOG(im. 28 - 29)

Leonardo by Cressi stores data about the la-test 60 dives or 70 hours elapsed with thefunctions DIVE AIR, DIVE NITROX andGAGE. Data is recorded every 20 seconds inthe LOG BOOK (dive log), which is activatedon the surface by repeatedly pressing the but-ton until the LOG icon is displayed. The latestdive will be displayed. To display the previousdives, press and hold until the dive numberflashes. Then press the button to reach the de-sired dive. To display the second screen of thedive, press and hold the button. Data will bedisplayed for 20 seconds, then the computer

automatically returns to the main screen. Pressthe button to extend the display time.

The LOGBOOK function enables to display, intwo separate screens, a full range of informa-tion relating to the dives, starting with the mostrecent dive in chronological order. The mainscreen displays the following information:

• Dive's year, month, and day.• Dive number: the most recent dive’s infor-

mation are given first. When more than 60dives are carried out, the oldest dives are de-leted.

• 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.

61


• Indicator of CNS O2 toxicity at the end of adive with program DIVE AIR or DIVE NI-TROX.

• The display will display all icons relating to thealarms which have possibly engaged duringthe 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 fol-lowing data (im. 28-29).

• Dive’s starting time (the time when the com-puter has gone below 4 ft.), activating thefunction relating to the set computing pro-gram ("DIVE" or “GAGE”);

• Mixture used for the dive with the functionDIVE AIR or DIVE NITROX: if an air dive, AIRwill appear, if a Nitrox mixture dive, the dis-play shows respectively FO2 and NITROX.

• Water temperature. • Safety Factor (SF 0-1-2).

62


63

SURFACE INTERVAL

AIR

NITROX

PRESS AND HOLD

LIGHT

(im. 26)


PLAN FUNCTION

PRESSPRESS AND HOLD

PRESS PRESS

64


SECONDARY MENU

AUTOMATICRETURN

PRESS

(im. 27)


HISTORY FUNCTION - DIVE HI-STORY (im. 30)

The computer is equipped with a dive historymemory for DIVE AIR, DIVE NITROX, andGAGE dives. To access this function, repeatedlypress the button until the HISTORY icon appe-ars. The program will display the following in-formation:• 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 restartfrom zero.

DIVE PROFILE FUNCTION - DIVEPROFILE

The detailed profile of the dives can be viewedby means of the software of the interface. A PC(Desktop or Notebook) is required. The displaywill automatically show any information relatingto depth, time and decompression of the mostrecent dive stored in the logbook, therefore al-lowing to scan the dive’s profile in detail. Thedata interval is 20 sec.

The display shows as well all the icons relatingany alarm activated during the dive, such as:PO2 (PO2 alarm), SLOW (maximum ascentrate alarm), and so on.

65

)


PCLINK FUNCTION - PC COMPATI-BLE INTERFACE

Using the PC link function with the PC button,the Cressi Leonardo connects with your perso-nal computer using an interface that you maypurchase as a separate accessory. The interfacewill allow you to download and print all availa-ble data from your Leonardo, including diveprofiles, and with this, you can modify the datausing the dive simulator feature.

66


67

LOG BOOK

AIR

PRESSPRESS AND HOLD

PRESS AND HOLD

PRESS


(im. 28)

after 20 sec.

after 20 sec.

AUTOMATICRETURN

after 20 sec.SECONDARY MENU


NITROX

(im. 29)

68

PRESSPRESS AND HOLD

PRESS AND HOLD

PRIMARY MENU SECONDARY MENU TERTIARY MENU

PRIMARY MENU

AUTOMATICRETURN

after 20 sec.


(im. 30)

69

HISTORY PCLINK

PRESS PRESS


SYSTEM RESET - RESET OF THE IN-STRUMENT

By resetting the instrument, all the computati-ons related to the current de-saturation arereset. Dive logbook, profile and history remainstored in the memory even after the instru-ment’s reset. The settings return to the factorydefault. Such function may be especially useful incase of instrument’s renting by Diving Centres.

� DANGER: Do not reset your instru-ment if it has to be used to computesubsequent dives!The procedure to perform this operationhas already been explained in the chapter“Before diving”.

5 - CARE AND MAINTENANCE.Leonardo by Cressi has been designed to ope-rate in extreme conditions with extensive un-derwater use. You should remember that it is aprecision instrument deserving appropriatecare. Please avoid any violent shock, protect itfrom extreme heat sources, always wash it infresh water after using, dry it carefully, do notstore it wet, and avoid contact with heavyequipment, like diving cylinders.

� WARNING: avoid contact between thecomputer and solvents or chemical sub-stances. Do not use compressed air to drythe computer. The button does not needany particular care; never grease with oil orspray of any kind.

70


NOTE: When replacing the battery, checkits housing; should any signs of moisture bevisible, please have the instrument checkedby an authorized service centre.Should you notice any anomaly in functio-ning, do not use the instrument to dive andhave it checked by an authorized Cressi re-tailer.

BATTERY REPLACEMENT. (im. 31)

Replacing the battery is easily done by the con-sumer, not requiring special service. It must bedone any time the instrument’s display showsthe run-down battery symbol.

� WARNING: by replacing the battery, allinformation relating to de-saturation, timeand date will be cancelled. Reset the timeand date, in order to get correct entries inyour computer’s logbook. Please do not re-place the battery when de-saturation is in

progress, since all information relating tode-saturation computing would be cancel-led. In this case, please check the amountof de-saturation hours and do not dive afterbattery replacement during a correspon-ding amount of hours. After battery repla-cement, all settings go back to the latestvalue set by the user. Time and date mustbe reset.

To replace the battery, unscrew the batterycover on the back of the instrument, using acoin. Remove the lid and check the batteryand its housing. Should you note traces ofcorrosion due to water entry, have the in-strument checked by an authorized Cressiretailer. If everything appears in good condi-tion, remove the battery from its housing byholding the computer face down. Replacethe battery complying with its polarity (an in-correct polarity may damage the instru-

71


ment). Before closing the cover, check thatthere is no soiling on its seat and apply a thinlayer of silicone grease to battery cover seal.

NOTE: Different factors affect the batterylife. For example: time of storage before ac-quiring the instrument, dive time, use of back-light, battery’s quality (whose average lifedepends on temperature and other factors).

NOTE: Do not over tighten the batterycover! Over tightening of the cover doesnot create a better seal; to the contrary, itcan result in cracking of the cover or diffi-culty in removing the cover in the future.

NOTE: Make sure that the instrument iswatertight!

� WARNING: Any anomaly or water in-filtration due to incorrect battery replace-ment will void the warranty.

72


(im. 31)

73

RUN-DOWN BATTERY WARNING


6 - TECHNICAL SPECIFICATIONS.Algorithm: CRESSI RGBM algorithm. Sample tissues: 9 with saturation hemi-pha-ses between 2.5 and 480 minutesDimensions and weight: Diameter: 67 mm -Height: 27 mm - Weight: 135 gDepth sensor:- Sea water setting (fresh water depths are

about 3% lower)- Measuring field: 0-393 ft., measured every se-

cond.- 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 °TWATCH:- Precision: +/- 50 seconds month average- 24 hours displayBATTERY:

CR 2430 - 3V battery. 2 years average life (by50 yearly dives).

NOTE: Different factors affect the batteryaverage life. For example: time of storagebefore acquiring the instrument, dive time,use of back-illumination, battery’s quality it-self (whose average life varies according totemperature).

74


7 - WARRANTY.CRESSI LIMITED WARRANTY FORCRESSI UNDERWATER COMPUTERSAND RELATED ACCESSORIES

Important notice: this warranty does not limitthe statutory rights granted to the consumer bythe applicable National Laws concerning thesales of consumer products.

Cressi provides this limited warranty to the pur-chaser of the Cressi underwater computer andof the related accessories (product).

During the warranty period, Cressi, or a Cressiauthorized service centre, according to their ex-clusive judgement, will remove any defect interms of material, design and workmanship,free of charge, by means of repair or replace-ment of the product according to this limitedwarranty.

This limited warranty is valid and effective ex-clusively in the country where the product hasbeen purchased, provided that Cressi has pro-vided for the sale of the product in such coun-try. However, in case of purchase of the productin one of the member states of the EuropeanUnion, in Iceland, Norway, Switzerland and Tur-key and if Cressi has originally foreseen the saleof the product in one of these countries, this li-mited warranty is valid and effective in all thesecountries.

Limitations to the service provided by this war-ranty could be caused by the presence in theproducts of specific items for a country.

For countries not belonging to the EuropeanUnion, different from Iceland, Norway, Swit-zerland and Turkey, provided that the purcha-ser agrees to pay a service fee and a refund forshipping expenses borne by Cressi or by aCressi authorized centre, it is possible to obtain

75


the service foreseen by the warranty in countrydifferent from that where the product has beenpurchased. In that case, any spare part will beprovided free of charge.

Warranty period

The warranty period starts form the retail pur-chase date by the first purchaser.The product can consist of several componentswhich may be covered by a different warrantyperiod, notably this limited warranty is valid fora period of:

A) two years for underwater computersB) one year for consumables and accessories, in-cluding, but not limited to, watchbands, buckles,etc. (either in bundle with the underwater com-puter or sold separately).Within the limits allowed by the applicable Natio-nal Laws, the warranty period will not be exten-ded or renewed or changed in any way following

a later resale, product repair or product repla-cement authorized by Cressi. However, theparts of the product repaired or replaced du-ring the warranty period, or the replaced pro-duct are warranted for the remaining originalwarranty period or for three months from therepair or replacement date, depending onwhich period is longer.

How to avail of the warranty servicesIf you want to submit a claim according to this li-mited warranty, contact your Cressi authorizeddealer for information about claim submission; in-formation will be provided about how to requestthe application of the warranty to your product.If you want to return the product by shipping itto your authorized Cressi dealer, make sure thatshipping is prepaid.

The validity of the claims submitted according tothis limited warranty is subject to notification to

76


Cressi or to a Cressi authorized service centreof the alleged defect within a reasonable timeform its observation, however not beyond theexpiry of the warranty period.

For any claim, based on this limited warranty, it isnecessary as well to provide one's name and ad-dress, the purchase proof which shall clearly indi-cate the name and address of the seller, the dateand place of purchase and the type of product.The request of repair under warranty will be sa-tisfied free of charge by Cressi or by a Cressi aut-horized service centre, according to theirexclusive judgement, and the product will be re-paired or replaced within a reasonable time.

If the product is deemed non compliant with theterms and conditions of this limited warranty,Cressi or a Cressi authorized service centre re-serve the right to charge service and/or repaircosts.

Other important notes

In case of product repair or replacement, thedata and contents stored in it may get lost.Cressi or a Cressi authorized service centre willnot be liable for any damage or loss of contentsor data during Product repair or replacement.

Cressi recommends to make back-ups or totake written note of each important content ordata stored in the product.

The Product or part of it, when replaced, willbecome property of Cressi. In case a refund isgranted, the related product must be returnedto a Cressi authorized service centre, since it be-comes a property of Cressi and/or the Cressiauthorized centre.

In case of repair or replacement of the Product,Cressi or a Cressi authorized service centre, canuse 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 standardwear, b) defects caused by improper use (in-cluding, but not limited to, defects caused bysharp objects, bending, compression, fall,shocks, etc.) c) defects or damages due toimproper use of the product, including usenon compliant with the instructions providedby Cressi (e.g. those indicated in the instruc-tion manual of the product) d) defects cau-sed by other events not depending on Cressi;

2. user manuals or software by third parties(even if included in the package or sold to-gether with Cressi hardware), settings, con-tents or data, either provided with theproduct or obtained by means of download

or provided together with installation, as-sembly, shipping or other stage of the supplychain or otherwise purchased by the buyer;

3. defects or alleged defects caused by the useor connection of the product, with any ac-cessory, software e/o service not producedor provided by Cressi or by using the pro-duct differently from the intended use;

4. replaceable batteries.

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This limited warranty is void in the followingcases:1. if the Product has been opened, changed or

repaired by personnel not belonging toCressi or a Cressi service centre;

2. if the Product has been repaired using nonauthorized spare parts;

3. if the Product has been exposed to chemicalsubstances such as (including, but not limitedto) insect repellents.

Cressi does not guarantee uninterrupted orerror free operation of the Product or that theProduct will operate in combination with otherhardware or software provided by third parties.

Limitation of Cressi liability

THIS LIMITED WARRANTY IS THE ONLYAND EXCLUSIVE APPEAL INSTRUMENTAVAILABLE FOR THE PURCHASER AND RE-PLACES ANY OTHER WARRANTY, EITHEREXPLICIT OR IMPLICIT.HOWEVER, THIS LIMITED WARRANTYDOES NOT PREJUDICE THE RIGHTSGRANTED BY THE APPLICABLE NATIO-NAL REGULATIONS. CRESSI SHALL NOTBE LIABLE FOR SPECIAL, INCIDENTAL, PU-NITIVE OR CONSEQUENTIAL DAMAGES,INCLUDING, BUT NOT LIMITED TO, LOSSOF PROFITS OR FORESEEN BENEFITS,LOSS OF SAVINGS OR INCOME, DATALOSS, PUNITIVE DAMAGES, UNSUCCESS-FUL USE OF THE PRODUCT OR ASSOCIA-TED EQUIPMENT (IF ANY), COST OF THECAPITAL, COST OF THE REPLACEMENT

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EQUIPMENT OR STRUCTURES,DOWNTIME, CLAIMS BY THIRD PARTIES,INCLUDING CUSTOMERS AND DAMAGESTO PROPERTIES CAUSED BY THE PUR-CHASE OR USE OF THE PRODUCT OR RE-SULTING FROM BREACH OF WARRANTYOR CONTRACT, NEGLIGENCE, ABSOLUTERESPONSIBILITY OR OTHER LEGALMEANS, EVEN IF CRESSI KNEW THE PRO-BABILITY OF SUCH DAMAGES. CRESSISHALL NOT BE LIABLE FOR DELAYS INTHE PROVISION OF THE SERVICE TOWHICH THIS LIMITED WARRANTY REFERSOR OF THE IMPOSSIBILITY OF USE DU-RING THE PRODUCT REPAIR PERIOD.

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Note:

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Via Gelasio Adamoli, 501 - 16165 - Genova - ItaliaTel. (0) 10/830.79.1 - Fax (0) 10/830.79.220

E.mail: [email protected]


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