Manuale d’istruzioni
Manuel d’instructions
Gebrauchsanweisung
Manual de instrucciones
User’s Manual
User’s Manual
User’s Manual
ENGLISH
TABLE OF CONTENTS
1. - INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 161
1.1. - Main specifications . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 161
1.2. - Safety measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 161
1.2.1. - Definitions of danger, warning and note. . . . . . . . pag. 161
1.2.2. - General recommendations and safety measures. pag.162
1.3. - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.163
2. - BEFORE DIVING . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.165
2.1. - UFDS display and controls. . . . . . . . . . . . . . . . . . . . pag.166
2.2. - On surface, before diving . . . . . . . . . . . . . . . . . . . . pag.166
2.3. - Parameters setting . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 167
2.3.1. - Dive program parameters setting ( ). . . . . . . . . p a g . 167
2.3.2.- Dive planning ( ). . . . . . . . . . . . . . . . . . . . . . . . pag.169
2.3.3. - Rapid visualisation of set data ( ) . . . . . . . . . . pag.169
2.4. - program parameters setting
(depthometer/timer). . . . . . . . . . . . . . . . . . . . . . . . . pag.169
2.5. - Instrument general setting . . . . . . . . . . . . . . . . . . . pag. 170
2.5.1. - Maximum depth alarm. . . . . . . . . . . . . . . . . . . . . . . pag. 170
2.5.2.- Date and time adjustment ( ) . . . . . . . . . . . . . pag. 171
2.5.3.- Units of measure setting . . . . . . . . . . . . . . . . . . . . . pag. 171
3. - WHILE DIVING: PROGRAM DIVE . . . . . . . . . . . pag.173
3.1. - Air dive ( ) . . . . . . . . . . . . . . . . . . . . . . . . . pag.173
3.2. - Nitrox mixtures dive ( ). . . . . . . . . . . . . . . . pag.174
3.2.1. - Before a Nitrox dive . . . . . . . . . . . . . . . . . . . . . . . . pag. 174
3.3. - Nitrox parameters setting . . . . . . . . . . . . . . . . . . . . pag.174
3.3.1. - PO2 partial pressure setting . . . . . . . . . . . . . . . . . . pag.174
3.3.2.- Nitrox mixture/s oxygen fraction F02 setting . . . pag.175
3.3.3.- Mixture changing while diving . . . . . . . . . . . . . . . . pag. 176
3.3.4 - CNS toxicity display ( ) . . . . . . . . . . . . . . . . . . . . pag. 177
3.3.5.- PO2 alarm ( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 178
3.4. - Curve dive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 178
3.4.1. - Ascent rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 178
3.4.2.- Safety Stop ( ) . . . . . . . . . . . . . . . . . . . . . . . . . pag. 179
3.4.3.- Decompression forewarning ( ) . . . . . . . . . . . pag.179
3.5. - Decompression dive ( ) . . . . . . . . . . . . . . . . . pag.180
3.5.1 - Omitted decompression stage alarm . . . . . . . . . . pag. 181
3.6. - program (depthometer/timer) . . . . . . . . . . . pag. 181
4. - ON SURFACE AFTER A DIVE . . . . . . . . . . . . . . . pag.183
4.1. - Data processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.184
4.1.1. - Surface interval ( , , ) . . . . . . . . . . . . . . pag. 184
4.1.2. - Logbook ( ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.185
4.1.3. - Dive historic memory ( ) . . . . . . . . . . . . . . . . . . pag.186
4.1.4. - Dive profile ( ) . . . . . . . . . . . . . . . . . . . . . . . . . . pag.187
4.1.5. - Data PC transfer: compatible PC interface ( ) pag. 187
4.1.6. - Instrument reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.188
4.2. - Simulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.188
4.2.1. - Dive simulator ( ). . . . . . . . . . . . . . . . . . . . . . . . pag.188
4.2.2.- Surface interval dive simulator ( ). . . . . . . . . . pag.189
5. - CARE AND MAINTENANCE. . . . . . . . . . . . . . . . . pag.189
5.1. - Battery replacement. . . . . . . . . . . . . . . . . . . . . . . . . pag.190
6. - TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . pag. 191
6.1. - No decompression limits by the first dive
in a series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.192
6.1.1. - Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.192
7. - WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.193
1. - INTRODUCTION.
Congratulations on your purchase of the Archimedes II com-
puter. The Archimedes IIis a sophisticated computer offering
numerous performance features which ensures the utmost
in performance, reliability and safety.
1.1. - Main specifications.
• Algorithm. The Bühlmann ZH-L8 algorithm has been refined by Randy Bohrer in order to make available a more
complicated RGBM program. The result is an algorithm
very similar to ZH-L16 which is less penalizing related to
water temperature and exceeding ascent rates.
• Tissues: 12 Tissues with saturation hemi-phases between
5 and 640 minutes;
• PROGRAM
Dive data full processing. During air or Nitrox dives (including
decompression dives) two different nitrox mixtures may be
utilized.
• Setting of mixtures. P02 can be set between 1.0 bar to 1.6
bar. FO2 settings between 21% to 50% and 21% to 99%.
• The Archimedes II will allow for a nitrox dive subsequent to
an air dive even during de-saturation.
• Possibility of PROGRAM setting (depthometer/timer)
• Large UFDS display system allows for ease in reading and
understanding of values.
• Replaceable display protecting screen
• Battery replacement by user
• Manual dive planning (Scrolling)
• Unit of measure changing from metric to feet and °C to °F.
• Sound and visual warning systems
• Nitrogen saturation graphic indicator
• CNS oxygen toxicity graphic indicator
• Back-luminescent display
• Dive simulator (surface interval setting for a subsequent dive)
• Calendar and clock
• Logbook (30 h or 60 dives) including dive profile
• Dive historical memory
• Reset button allows for multi diver activity.
• PC interface (optional)
1.2. - SAFETY MEASURES.
1.2.1. - Definition of danger, warning and note.
Please read the user guide thoroughly prior to using the
Archimedes II.
Prior to reading the operational directions, please understand
the following definitions:
DANGER: indicates a situation (or procedure) that
may be dangerous to the diver’s health and safety.
WARNING: indicates a situation (or procedure) that may
be dangerous to the diver or damage the instrument
NOTE: stresses important information.
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ENGLISH
1.2.2. - General recommendations and safety
measures.
WARNING: Read the directions! Please read users’
guide carefully, including the safety measures section.
Have a thorough understanding of the instrument’s use,
functions and limitations before using it! DO NOT use the
instrument without having read each chapter of the users’
guide!
DANGER: A underwater diving computer can never
completely eliminate the risk of decompression sickness.
The computer does not take into any account a diver’s
physical conditions which may vary daily. It is recommended that a medical examination is completed prior to commencing any underwater diving activities, and to assess
one’s own physical condition before each dive.
Circumstances such as cold water temperature (less than
10°C – 50F), poor physical condition, multiple dives made
on subsequent days, weariness, use of alcohol, drugs, or
medication and dehydration my increase the risk of
decompression sickness.. It is recommended to avoid all
such situations that may increase the likelihood of decompression sickness.
WARNING: The Archimedes II should be used only by
properly trained and certified divers. No computer will
replace proper underwater training.
WARNING: The Cressi-sub Archimedes II computer is
designed for recreational sport diving only. It is not designed for commercial use requiring increased diving activity.
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 clear and if
the battery is low.
WARNING: While diving, be equipped with a depth
gauge, diving watch and dive tables. Additionally, check
the air capacity in your diving cylinders.
DANGER: Do not dive at high altitudes before the
instrument has automatically switched on the program
corresponding to the altitude at which you are. Please
check the altitude level on the display. Please be advised
that diving at higher altitudes than 9,842 ft. above sea level
involves an increase risk of decompression sickness.
DANGER: Before flying, wait until the icon "No Fly
Time" on the computer display has disappeared.
WARNING: The information offered on the computer is
strictly personal for the individual who used the instrument during a dive or a series of dives.
DANGER: Cressi-sub discourages the use of this
instrument in decompression dives. In the event that nodecompression has been exceeded, the Archimedes II
Cressi-sub computer will display information related to
decompression, surfacing and surface interval times.
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. (i.e. 36% not
35.8% )
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DANGER: The use of nitrox should not be undertaken
without proper training. Nitrox dives will expose the diver
to different risks than those of air dives, including serious
physical damage and, in extreme cases, even death.
DANGER: As a safety measure the Archimedes II
computer utilizes a PO2 limit set at 1.4 bar even for air
dives. Should you require an additional safely margin, it is
possible to set PO2 at lower values, down to 1.0 bar, by
decrements of 0.1 bar.
WARNING: After a dive with the Archimedes II set in Gage
mode (depth meter-timer). The instrument will not make
saturation and de-saturation computations during the
remaining 48 hours elapsing from the depth meter’s use.
WARNING: Avoid diving activities that result in unsafe
profiles such as "yo-yo" dives, dives with reversed profiles
or several subsequent dives during subsequent days.
Diving activities such as these are potentially dangerous
and present a higher risk of decompression sickness.
WARNING: Please utilize the most conservative safety
factor at all times. By doing so, you will dive more conservatively, which will minimize the likelihood of decompression sickness.
NOTE: While flying, the Archimedes II must be stored in
the pressurized cabin.
NOTE: Cressi-sub strongly recommends that all sport
diving activities be conducted within the guidelines of nodecompression diving and at a maximum depth of 132 ft.
Exceeding these perimeters dramatically increases the
likelihood of decompression sickness
As a result of technological advancements/changes, Cressisub reserves the right to modify the Archimedes II computer
without notification.
1.3. – Introduction.
The Archimedes II computer is a multifunctional instrument
for sport diving. It will supply information on depth, dive times,
decompression status, ascent rate, and surfaces interval
time between dives. Nitrogen absorption and release is continuously processed by it’s sophisticated software.
Information is displayed in large characters on the
Archimedes II’s
system allows for easy and direct dialogue between the diver
and the computer, ensuring a clear understanding of all the
data needed at any given time.
Additionally, the computer is equipped with a watch and
calendar, a multifunctional dive memory (logbook), and a dive
simulator.
The Archimedes II’s mathematical model can make saturation and de-saturation computations of dives carried out with
air, and with up to two different nitrox mixtures. These may be
selected during the dive itself. Nitrox mixture(s) dives may be
set from the maximum PO2 value between 1.0 and 1.6 bar to
oxygen percentage (FOG): the primary (MIXI) between 21% 50% for O2, the second (MIX2) between 21%-99%.
Additionally, the computer may be set by the user for either
metric (m -°C) or feet (ft. -°F).
Archimedes II Cressi-sub underwater computer may be
connected to a compatible PC, by means of a Cressi-sub
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User Friendly Display System
(UFD). This
ENGLISH
interface (accessory) and its related software Cressi PC
Logbook (accessory).
Please note that it is very important to read and understand the
users guide and the operation of the Archimedes II. Serious
damages or death can result if theses guidelines are not clearly
understood.
Archimedes II Cressi-sub computer’s watch and calendar
function (see picture 1) are always on, and the related battery
consumption is unnoticeable.
Operational functions are easily visible either by depressing buttons B (Mode), A or C, or when the contacts get wet during a
diving activity (the dive program turns on at a depth greater than
5 ft. and are illustrated by the figures shown on its large display.
In order to understand all the computer’s functions and their
meaning, the guide is divided into five main chapters, dealing
with every possible situation:
• 1 - Introduction and safety measures
• 2 - Before diving
• 3 - While diving
• 4 - On surface after diving
• 5 - Care and maintenance
The Archimedes II is designed to be easily understood and
operated. It displays only the data needed during specific
situations.
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Foto Ghisotti
2) Before diving
2) Before diving
ENGLISH
2.1. - UFDS display and controls.
A
B
C
Archimedes II’s different programs are visible by repeatedly
depressing button B (Mode). This is the key to operating the
system. They are clearly indicated by the alpha-numeric
UFDS display. Some programs have sub-menus, which are
switched on by depressing buttons A and C. This will allow as
well as change the setting on the surface. Depressing button
C ( ) engages the display back-illumination.
2.2. - On surface, before diving.
As previously noted, the Archimedes II is always on. When
diving at altitude, it is important to check that the appropriate
altitude adjustments have occurred. This function is carried
out automatically, updating every 10 minutes. Altitude adjustment values will be displayed as follows:
no icon ( )- from 0 – 2.625 ft. (picture 1)
- from 2.625 – 5.250 ft. (picture 1-a)
- from 5.250 – 7.874 ft.
- from 7.874 – 19.685 ft.
- more than 19,685 ft. -out of range
Each icon indicates that the computer has automatically
modified its own mathematical model to adjust to proper
altitude.
Archimedes II computer is equipped with a “
Display System
during its operation. Various icons on the display will indicate
the operation that may be carried out at that moment. As an
example, the “light” icon ( ) (at the bottom on the right) indicates that by depressing button C the back-illumination will
be engaged. This establishes a direct “dialogue” and a clear
understanding of every function.
” (UFDS) display, which “escorts” the diver
User Friendly
DANGER: Diving at altitudes greater than 9,842 ft.
above sea level involves an increased risk of decompression sickness.
Diving at higher altitudes than normal may cause alterations
of the nitrogen balance between the human body and the
environment.
166
IIt is recommended that before diving at altitude, wait at least
i
three hours after arriving at your diving destination. This will
allow a partial release of the residual nitrogen from the body.
The atmospheric pressure at higher altitudes is lower than at
sea level. Therefore, the diver has additional nitrogen in his
body than at the lower altitudes. The excess is gradually
released and the balance re-established within a couple of
days. At this point it is important to check:
The low battery indicator. It should not be on or flashing (picture 2 a-b).
The computer display is operating. All liquid crystal segments
should be displaying.
WARNING: Should the display show the symbol of a low
battery (picture 2 a-b), the computer must NOT be used.
Additionally, should it display during a dive, the diver must
immediately surface. A battery replacement is required as
outlined in chapter 5.
2.3. - PARAMETERS SETTING.
In order to set the dive’s parameters, you must depress the
central button B (Mode), and the icon relating to the
you want to use will be shown (picture.3): , for air dives
( ) or Nitrox, mixture(s), or if you want to use
the depth meter /timer program.
NOTE: Archimedes II computer is preset on pro-
gram.
program
2.3.1. - DIVE program parameters setting.
NOTE: Archimedes II computer is preset on pro-
gram.
This is the basic program with which the Archimedes II is set.
It is possible to modify its parameters by repeatedly depressing button A ( ), which allows you to select, in the following
order, the dive’s parameters relating to:
PO2 Mix 1 -> FO2 Mix 1 -> PO2 Mix 2 -> FO2 Mix 2
-> Safety Factor -> Max Depth -> OFF/ON -> DIVE
that is:
• PO2 Mix 1 is the partial pressure of the former of the two
Nitrox mixtures, so that Archimedes II can make its decompression computations. The diver can set it on values
between 1.0 bar (included) and 1.6 bar (included), by variations of 0.1 bar, obtained at each pressure of button C ( );
NOTE: By varying of max PO2 setting (picture 3), the computer also indicates the maximum depth (MAX) that may be
reached with that mixture.
WARNING: Both mixtures’ PO2 factory set on a basic value
(default) of 1.4 bar, both for air dives and for Nitrox mixture
dives. The diver is then following the most conservative
values recommended for sport dives. Different PO2 values
may be set as shown in chapter 3.3. The set value will be
memorized in the computer until the diver chooses another
setting.
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ENGLISH
• FO2 Mix 1 is the oxygen percentage of the primary Nitrox
mixture (MIX1) set on Archimedes II. The diver may vary it on
values between FO2=Air (21%) – basic setting - and FO2=50
% (included), by variations of 1% O2, obtained at each
depression of button C ( );
WARNING: Archimedes II is factory set with the primary
Nitrox mixture on Air (FO2=21%) and the second additional
mixture on Off (FO2= - -%)
NOTE: During the phase of parameters’ setting, by depressing button C ( ), the computer will automatically stop on
standard Nitrox 1 mixture (EAN 32), with an oxygen percentage of 32%. By keeping button C ( ) depressed, it will stop
on (Air) setting. This is to allow the FO2 operations setting to
be set quicker. Additionally, it is possible to set other FO2
values for the mixture (in increments of 1%) each time you
depress button C ( ). The constant depressing of button C
will increase the increments rapidly.
NOTE: By varying of the mixture’s oxygen percentage, the
computer indicates the maximum depth (MAX) which may
be reached with that mixture, since it depends on the PO2
value set.
• PO2 Mix 2 is the partial pressure of the latter of the two
Nitrox mixtures (MIX2) that can be set on Archimedes II
computer. It is factory set on the value of PO2=1.4, but it may
be changed by the diver on values between 1.0 bar (included)
and 1.6 bar (included), by increments of 0.1 bar, following
each other at each depression of button C ( );
• FO2 Mix 2 is the oxygen percentage of the second Nitrox
mixture (MIX2) set on Archimedes II computer. It is factory
set on Off (FO2= - -%) and it may be switched on only by the
diver, by depressing button C ( ), on values between FO2=Air
(21%) and FO2=99% (pure oxygen), by variations of 1%, following each other at each pressure of button C ( )
• A Safety Factor may be set by the diver at one of three
values (SF0/SF1/SF2). It is factory set at SFO.
WARNING: In order to dive more conservatively, please
change your safety factor any time you feel that you are at
risk of decompression sickness.
• The maximum depth alarm is set on ft. 132 and OFF by the
factory (picture 4 a); it can be switched On and be modified
as well as the depth at which it will start (picture 4b), by
depressing button C ( ).
At the end of the setting, depress button B (Mode) for several seconds; this will allow you to return to the normal display
(picture 1).
Related topics:
• 2.5.1. - Maximum depth alarm.
• 3.1. - AIR DIVE.
• 3.2. - NITROX MIXTURES DIVE.
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2.3.2 - Dive planning ( ).
i
While on the surface it is possible to go to the Plan function
( ) in order to visualize the remaining time available at different depths, without having to make decompression stops
(curve time), only by primary mixture MIX1.
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, Archimedes II takes into
account the residual nitrogen, therefore reducing the curve
times.
When the computer is set on program, by depressing
button B (Mode) twice, you view to the function ( ), as
shown by the alphanumeric display. The display will show (picture 5, air; picture 5.1., Nitrox) no decompression depths times
between 30 – 157 ft., in depth increments of 10 ft. This is obtained by depressing C ( ), or by manual depth decreases, each
of ft. 10, by depressing button A ( ).
Depress button B (Mode) for several seconds in order to get
back to the normal display (picture 1).
NOTE: PLAN function will be switched off in program
and in this case the computer shows Error.
Related topics:
• 2.3.1. - program parameters setting
• 3.4. - Curve dive
• 4.1.1. - Surface interval.
• 3.5.1. - Omitted decompression stage alarm. (Error)
2.3.3. - Rapid visualisation of set data ( ).
The INFO ( ) icon on Archimedes II Cressi-sub computer
UFDS display allows you to visualize, while on the surface,
every set parameter for your dive in a quick and easy manner
(picture 6), when the computer is set on program.
By depressing button A ( ), the computer will display the set
PO2 and the relating maximum depth MAX (given in m or ft.);
the possible setting of a safety factor (SF0/1/2); the possible
oxygen percentage of the primary Nitrox (Mix 1) and the relating icon ( ), or the icon ( ) in case of an air dive. By
keeping the button depressed, the computer will display the
second mixture’s parameters (if set) in alternative sequel, and
then return to those of the primary.
Related topics:
• 2.3.1. - program parameters setting
• 3.1. - AIR DIVE.
• 3.2. - NITROX MIXTURES DIVE.
2.4. - program parameters setting (depthometer/timer)
The Archimedes II computer is equipped with a third program
( program or depth meter/timer) that may be used for
both apnea (free divers) divers and for the use in technical
dives with helium-based binary and ternary mixtures. In this
case, the instrument gives only the dive’s basic depth and dive
time parameters. It does not make tissue saturation and desaturation computation, which must be programmed and
computed by means of proper software and/or tables.
Cressi-sub reminds you that sport dives must be carried out
within the no-decompression guidelines, and at the maximum
depth of 132 ft. This is the limit of sport diving. To exceed these
limits remarkably increases the risk of decompression sickness.
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ENGLISH
WARNING: Archimedes II Cressi-sub computer has been
i
i
developed for sport diving use 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-sub discourages diving with
gaseous mixtures other than air without proper training.
The use of “
diver to different risks than those of sport diving, including
serious physical damages and, in extreme cases, death.
WARNING: After a dive with Archimedes II set in
not make saturation and de-saturation computa-
tions during the following 48 hours.
technical
mod. (depth meter-timer). The instrument will
” multi-gas mixtures may expose the
DANGER: Should you decide to reset the instrument
by depressing button RESET on the back of the computer,
the nitrogen memory will be cancelled; therefore; the
instrument will not be able to compute a following dive.
Never use this function for at least 48 hours after the last
diving activity.
To go to program depress button B until the menu
is shown, then depress button C, which you may choose
Archimedes II DIVE/GAGE programs (Picture 7).
NOTE: Archimedes II computer is set at the factory on
gram to be used.
In program, the INFO, PLAN and SIMU functions are swit-
program.
program will remain set until the diver changes the pro-
ched off, while it is possible to set only a maximum depth
alarm which may be switched on or off by the user by setting
the instrument, following the same procedures shown in
chapter 2.5.1.
NOTE: In function the depth indicator gives indica-
tions between 0 – 655.8 ft..
Related topics:
• 2.5.1. – Maximum depth alarm.
• 3.6. – program (depthometer/timer)
2.5. - Instrument general setting.
2.5.1. - Maximum depth alarm
Archimedes II computer is equipped with a maximum depth
alarm preset at the factory (picture 8 a) on a value of 132 ft.
This is the limit of sport dives. When the function is on (ON)
(picture 8b), upon reaching the set maximum depth a sound
alarm will start and the display will flash for three seconds.
It is possible to switch on the alarm, or modify the maximum
depth, by depressing button B, then button A ( ), selecting,
in the following order, the dive’s parameters relating to:
PO2 Mix 1 -> FO2 Mix 1 -> PO2 Mix 2 -> FO2 Mix 2
-> Safety Factor -> Max Depth -> OFF/ON
While in Max Depth menu (picture 8 a), you may modify the
value of maximum depth from 0 – 325 ft., by depressing button C ( ). When you have set the desired depth, depress button A ( ) in order to switch on or off the depth alarm by means
of button C ( ). The computer is set at the factory on the
values of 132 ft. and OFF . Depressing button B (Mode) for several seconds will return back to the normal display (picture 1).
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