Uwatec Aladin ONE User manual

Operating Manual
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SWISS MADE BY UWATEC AG
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ONE
®

2
Safety considerations
I UWATEC® Aladin® ONE
You must carefully read and understand this entire manual before using your Aladin® ONE.
Diving has many inherent risks. Even if you follow the instructions of this
manual in a careful manner, it is still possible that you may be seriously injured
or die from decompression sickness, oxygen toxicity or some other inherent
risk of scuba with Nitrox or compressed air. Unless you are fully aware of these
risks and are willing to personally accept and assume responsibility for those
risks, do not use Aladin®
ONE.
Guidelines for the use of Aladin® ONE:
The following guidelines for using Aladin® ONE are derived from the latest medical research and the
recommendations of the American Academy of Underwater Sciences for diving with diving computers.
Following these guidelines will greatly increase your safety while diving, but cannot guarantee that
decompression sickness or oxygen toxicity will not occur.
• Aladin® ONE is designed for dives with Nitrox (max.50%O
2
) and compressed air (21%O
2
) only. Do not
use Aladin® ONE for dives made with other mixed gases.
• It is absolutely necessary to check the set mixture before each dive and to compare it to the gas mixture
currently used. Always remember: setting an incorrect mixture carries an inherent risk of decompressi-
on sickness and/or oxygen toxicity! Maximum deviation from the measured mixture must not exceed
1% O
2
. An incorrect gas mixture can be lethal!
• Only use Aladin® ONE with open circuit breathing systems. Aladin® ONE must be set for a determined gas
mixture.
• Only use Aladin® ONE for diving with an independent breathing apparatus. Aladin® ONE is not designed
for long term exposures with Nitrox.
• Always observe the visual signals. Avoid situations of increased risk which are marked with a warning
sign in this operating manual.
• Aladin® ONE has a ppO
2
warning. The limit is set at 1.4 bar ppO
2
max.
• Frequently check the "oxygen clock" (CNS O
2
). Ascend and finish the dive if the CNS O
2
exceeds
75%.
• Never dive deeper than the Maximum Operating Depth (MOD) pertinent to the gas mixture in use.
• Always check the diving limits considering the oxygen content and standard sports diving procedures
(decompression sickness, oxygen toxicity).
• In accordance with the recommended maximum diving limit of all instructional agencies, do not dive
deeper than 40 metres/130 feet.
• The danger of nitrogen narcosis has to be taken into consideration . Aladin® ONE gives no warning about
this.
• On all dives, with or without dive computer, make a safety stop for at least 3 minutes at 5 metres (15
feet).
• All divers using dive computers to plan dives and indicate or determine decompression status must use
their own computer, which they take with them on all dives.
• If Aladin® ONE fails at any time during the dive, the dive must be terminated, and appropriate surfacing
procedures (including a slow ascent and a 3 to 5 minute safety stop at 5
metres /15 ft ) should be initi-
ated immediately.
• Comply with the ascent rate and carry out any decompression stop required. If the computer should
fail for any reason, you must ascend at a rate of 10m (30 feet) per minute or less.
• On any given dive, both divers in a buddy pair must follow the most conservative dive computer for
that particular dive.
• Never dive without a buddy. Aladin® ONE does not substitute for a dive buddy.
• Only make dives that are appropriate to your level of dive training. Aladin® ONE does not increase your
knowledge of diving.
• Always dive with back-up instruments. Make sure that you always use back-up instrumentation inclu-
ding a depth gauge, submersible pressure gauge, digital bottom timer or dive watch, and have access
to decompression tables whenever diving with a dive computer.
WARNING

English
3
Safety considerations
I UWATEC® Aladin® ONE
• Avoid repeated ascents and descents (yo yo diving).
• Avoid repeated heavy workload while at depth.
• Plan the dives to be shorter if they are made in cold water.
• After finishing the decompression or at the end of a no-stop dive, the final stage of the ascent should
be as slow as possible.
• You MUST be familiar with all signs and symptoms of decompression sickness before using Aladin® ONE!
Seek IMMEDIATE treatment for decompression sickness should any of these signs or symptoms occur
after a dive! There is a direct correlation between the effectiveness of treatment and the delay between
the onset of symptoms and the treatment for decompression sickness.
• Only dive with Nitrox after you have been thoroughly instructed by a recognised institution.
Repetitive dives
• Diving with Nitrox: Make sure your surface interval is long enough (just like diving with compressed
air). Plan for a minimum surface interval of two hours. Oxygen, too, needs sufficient time to leave the
body.
• Match gas mixture to the intended dive.
• Do not attempt a repetitive dive if the microbubble warning
NO
is visible on the display.
• Plan a day without diving once a week.
• If you have to change computers, wait at least 48 hours before carrying out your next dive.
• Diving after a reset of the remaining saturation (reset, see page 12, or battery replacement, see
page 21) may lead you into
potentially hazardous situations which could result in death or serious
injury. After a reset of the remaining saturation do not dive for at least 48 hours.
Altitude and diving
• Do not dive at altitudes higher than 4000m (13000 feet).
Flying after diving
• After diving, wait at least 24 hours prior to flying.
Aladin® ONE dive instrument is a personal protective equipment in compliance with the essential safety
requirements of the European Union directive 89/686/EEC. RINA SpA, Via Corsica 12, I-16128 Genoa,
notified body no. 0474, have certified the conformity with the European Standard EN 13319:2000.
EN13319:2000 Diving accessories - Depth gauges and combined depth and time measuring devices -
Functional and safety requirements, test methods. Any information on decompression obligation displayed
by equipment covered by this standard is explicitly excluded from its scope.
I

4
Introduction
I UWATEC® Aladin® ONE
The following symbols are used in the operating manual:
This operating manual makes use of the following icons to indicate especially important comments:
Remarks Information and tips which are important for optimal use of the functions of
Aladin® ONE.
Danger!
Flashing display
9/2005, Copyright© by UWATEC Switzerland
Page reference e.g. ->10
Important remarks concerning signal words and symbols
Congratulations on purchasing Aladin® ONE and welcome to UWATEC. From now on you will enjoy the
assistance of the most extraordinary dive computer - equipped with UWATEC's most innovative technology
- while diving.
We thank you for choosing Aladin® ONE and we hope you will enjoy safe dives in the future! Further infor-
mation on UWATEC dive computers and other products by UWATEC can be found on our web page at
www.uwatec.com.
Safety considerations
Dive computers provide divers with data; they, however, do not provide the knowledge how this data
should be understood and applied. Dive computers cannot replace common sense! You must therefore
carefully read and understand this entire manual before using your Aladin® ONE.
->
Indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury.
WARNING
Quick reference
Current depth
Logbook: Maximum depth
Altitude symbol
Surface interval icon
Safety stop timer icon
Too fast ascent
Maximum depth
Temperature
Service icon
Dive time
No-stop time
Total ascent time
SOS duration
Time of day
Decompression depth
Duration of surface interval
Ascent time icon
No-stop indicator
Decompression stop
obligation / Ignored
decompression stop
Decompression stop
indicator
Do not dive icon
Microbubble warning
O2 mix
Oxygen toxicity CNS O2%
Ascent rate
Infrared icon
Battery icon
Nitrogen loading bar (dive)
Residual Nitrogen bar (surface)
Desaturation
Decompression stop duration
Logbook icon
STOP
S
L
O
W
NO
DECO
CNS O2%
DEPTH
NO STOP
DIVE TIME
DESATAMPM
Safety stop timer icon
STOP

English
5
List of chapters
I UWATEC® Aladin® ONE
I
I Safety considerations ___________________________________ 2
Introduction ___________________________________ 4
Important remarks concerning signal words
and symbols ___________________________________ 4
Quick reference ___________________________________ 4
List of chapters ___________________________________ 5
II System and operation ___________________________________ 6
1 System description ___________________________________ 6
2 Operation ___________________________________ 6
2.1 Water contacts ___________________________________ 6
2.2 SmartTRAK ___________________________________ 7
2.3 Switching on the display ___________________________________ 8
2.4 Switching off the display ___________________________________ 8
2.5 Battery warning and battery alarm ___________________________________ 8
III Diving with Aladin® ONE ___________________________________ 9
1 Terminology / Symbols ___________________________________ 9
1.1 General terminology / Display during no-stop phase ___________________________________ 9
1.2 Display during decompression phase ___________________________________ 9
1.3 Nitrox information (
O2 information) __________________________________10
2 Attention messages and alarms __________________________________11
2.1 Attention messages __________________________________11
2.2 Alarms __________________________________11
3 Preparation for the dive __________________________________11
3.1 Setting the gas mixture __________________________________11
3.2 Preparation for the dive and function check __________________________________12
3.3 Overview Aladin® ONE settings __________________________________12
4 Functions during the dive __________________________________13
4.1 Immersion __________________________________13
4.2 Phosphorescent display __________________________________13
4.3 Dive time __________________________________13
4.4 Current depth /
O2 % mix __________________________________13
4.5 Maximum depth / Temperature __________________________________13
4.6 Ascent rate __________________________________14
4.7 Partial pressure of oxygen (pp
O2 ) /
Maximum Operating Depth (MOD) __________________________________15
4.8 Oxygen toxicity (CNS
O2 %) __________________________________15
4.9 Nitrogen loading bar graph __________________________________16
4.10 Decompression information __________________________________16
4.11 3-minute safety stop timer __________________________________17
5 Functions at the surface __________________________________17
5.1 End of a dive __________________________________17
5.2 Logbook __________________________________18
6 SOS mode __________________________________19
7 Diving in mountain lakes __________________________________20
7.1 Altitude ranges __________________________________20
7.2 Decompression dives in mountain lakes __________________________________20
IV Appendix __________________________________21
1 Technical information __________________________________21
2 Maintenance __________________________________21
2.1 Replacing the battery __________________________________21
3 Warranty __________________________________23
4 Index __________________________________23

6II UWATEC® Aladin® ONE
1 System description
Aladin® ONE displays all important dive and decompression data.
Aladin® ONE has a data memory which stores the dive data. The data can be transmitted with an infrared
interface (IrDA) and SmartTRAK software to a Windows® personal computer. This software must also be
used to configure Aladin®
ONE .
SmartTRAK software CD is included with the Aladin® ONE Package. Infrared interfaces are available in PC
stores. A list of recommended interfaces is available on the UWATEC homepage (www.uwatec.com).
2 Operation
2.1 Water contacts
On submerging in water the water contacts switch on Aladin
® ONE
automati-
cally
.
On the surface you can switch on the Aladin
® ONE
by "bridging" the water
contacts with a moistened finger.
Infrared port
II System and operation
Aladin® ONE SmartTRAK
Infrared Interface
(option)
Water contacts

7
II UWATEC® Aladin® ONE
English
II System and operation II
Setting
• Setting the gas mixture
• Time limit to reset the O2% mix to air
• Unit system
• Reset desaturation
• UTC (Universal Time Change) zone
• Time of day
• 24 or AM/PM setting
• Date
• Display contrast
2.2 SmartTRAK
You must use SmartTRAK to configure Aladin® ONE , transfer dive data to a personal computer and graphically
display the data. To start the communication, place
Aladin® ONE so that its infrared window is in front of the
infrared interface, then select "Dive Computer Settings" under "OPTIONS" on the main menu bar.
If Aladin® ONE detects an infrared device within range appears.
The following settings may be changed with SmartTRAK:
Range
21-50% O2
no reset / 1 - 48 hrs.
metric/imperial
on / off
±13 hrs., increments: 15 min.
hours:minutes
1 (low) -12 (high)
Default
21% O2
no reset
no reset
GMT
4
Page
->11
->12
->8
• Number of past dives
• Total duration of dives
• Deepest dive
• Longest dive
• Atmospheric pressure
• Dive profile
• Logbook
• Temperature curve
• Alarms and attention messages
• Battery condition
The following data may be recalled with SmartTRAK:
When making any changes to the settings via SmartTRAK, you must press the "Write" icon for the changes
to take effect.

8II UWATEC® Aladin® ONE
2 Operation
2.3 Switching on the display
• automatically, on submerging in water or when adaptation to atmospheric
pressure is necessary;
• manually, by "bridging" the water contacts with a moistened finger.
Afterwards the display shows the time of the day, the O
2
mix and the tempera-
ture. This display is called
time of day display.
If there is a remaining saturation from the last dive, Aladin® ONE displays the
logbook information of the last dive (depth, dive time, temperature, O
2
%), the
surface interval, the "do not dive" icon (if applicable) and the residual nitrogen
loading as a bar graph ->18.
If there is a remaining saturation from a change of altitude, Aladin® ONE displays
the mountain symbol, the
adaption time as a bar graph and the time interval
since the change in altitude class
.
Aladin® ONE does not display a No-Fly time. To pre-
vent decompression sickness or death, you must
wait at least 24 hours after your last dive before
flying.
When Aladin® ONE is in state of rest no information is displayed but the atmo-
spheric pressure is continuously monitored. If a change in altitude range is
detected, Aladin® ONE switches on for 3 minutes automatically ->20.
2.4 Switching off the display
On the surface Aladin® ONE switches off automatically after 3 minutes without
operation.
STOP
S
L
O
W
NO
DECO
CNS O2%
DEPTH
NO STOP
DIVE TIME
DESATAMPM
STOP
Time of day display
2.5 Battery warning and battery alarm
When the computer senses that the battery needs to be replaced, the steady
battery symbol appears at first (warning). This allows you to do some more
dives, but you should change the battery as soon as possible.
When the battery reaches a dangerously low level, the battery symbol starts
to blink (alarm).
• Risk of computer malfunction!
The battery symbol blinks, on the surface and in
dive mode, to alert the diver of a dangerous situ-
ation: the battery may not have enough energy
to finish a dive.
Do not dive or finish the dive and replace the
battery ->21.
• Replace the battery when the steady battery
symbol appears ->21!
The battery condition can be checked with SmartTRAK.
The temperature influences the battery performance. In cold water it is lower
than in warm water. If the battery shows the steady battery symbol on the
surface, it is possible for it to start flashing during the dive.
WARNING
Flashing battery alarm
DEPTH DIVE TIME
NO
NO
Logbook information
WARNING

English
9
III Diving with Aladin® ONE
III UWATEC® Aladin® ONE
III
1 Terminology / Symbols
The information on the display of Aladin® ONE varies depending on the kind of dive and the dive phase.
1.1 General terminology / Display during no-stop phase
37 min. Dive time
Elapsed bottom time
No-stop time
24min
Current depth
Maximum depth
26.2 m
Decompression phase
Dive phase during which
surfacing is allowed only
after decompression
stops are completed.
No-stop phase
Dive phase during which surfacing is allowed
without stop.
Time
Depth
Ascent rate
(Only while
ascending)
Current depth
In metres (feet)
Maximum depth reached during the dive
Temperature
No-stop time
Remaining time
at a given depth
during which ascent
is allowed without
decompression
stop (min).
Nitrogen loading
bar
Oxygen toxicity
CNS O2%
Dive time
Duration of
the dive (min)
CNS O2%
DEPTH
NO STOP
DIVE TIME
%
Total ascent time to surface (7 min)
6 m
35.7 m
Decompression rangeNo-stop range
3 m
Time
Depth
Decompression
stop depth
Deepest stage is
displayed.
Decompression stop
duration
Prescribed duration of the
decompression stop at the
displayed decompression
stage (minutes).
Total ascent time
Including decompression
stops in minutes.
Decompression stop
All required decompression
stops must be observed.
Deepest
decompression
stop depth
2 min
Decompression
stop duration
STOP
NO
DECO
CNS O2%
DEPTH DIVE TIME
1.2 Display during decompression phase

1.3 Nitrox information (O2 information)
For dives with compressed air in normal recreational diving, nitrogen is the decisive gas for the decompres-
sion calculations. When diving with Nitrox, the risk of oxygen toxicity rises with the increase of the fraction
of oxygen and the increase of depth and can limit dive time and the maximum depth. Aladin® ONE includes
this in the calculations and displays the necessary information:
<O2% MIX> Fraction of oxygen: The fraction of oxygen in the Nitrox mixture can be set
with SmartTRAK between 21% (normal compressed air) and 50% in 1% incre-
ments. Your selected mix will be the basis for all calculations.
ppO2 max. Maximum allowed partial pressure of oxygen: the higher the fraction of oxy-
gen in the mixture, the shallower the dive depth at which this value of the
partial pressure of oxygen is reached. The depth at which ppO2 max. is reached
is called Maximum Operating Depth (MOD).
When you enter the settings for the gas mixture with SmartTRAK, SmartTRAK
will display the cor
responding MOD. Aladin® ONE warns the diver visually once
the depth is reached at which the ppO2 reaches the maximum allowed value
->15.
The setting of ppO2 max. is 1.4 bar.
<CNS O
2
> Oxygen toxicity: With the increased percentage of oxygen, the oxygen in the
tissues (especially in the central nervous system (CNS)) becomes important. If
the partial pressure of oxygen rises above 0.5 bar, the CNS O
2
value increases,
if the partial pressure of oxygen is below 0.5 bar, the CNS O
2
value decreases.
The closer the CNS O
2
value is to 100%, the closer the limit where symptoms
can occur ->15.
Nitrox diving may only be attempted by experienced divers after proper training
from an internationally recognized agency.
10
1 Terminology / Symbols
III UWATEC® Aladin® ONE
CNS O2%
increases
ppO2 Depth
at which ppO2
reaches 0.5 bar
for three typical mixes
0.5 bar
21% 13m (43ft)
32% 6m (20ft)
36% 4m (13ft)
CNS O2%
decreases
0.21 bar
WARNING

11
2 Attention messages and alarms
III UWATEC® Aladin® ONE
Aladin® ONE draws the diver’s attention to certain situations and warns the diver of unsafe diving practices.
Attention messages and alarms are visual only.
III
English
2.1 Attention messages
Attention messages are communicated to the
diver visually by symbols, letters or flashing fig-
ures.
Attention messages come up in the following
situations (more information can be found on the
listed pages):
Page
• Maximum Operating Depth / max. ppO
2
is reached 15
• Oxygen toxicity reaches 75% 15
• No-stop time less than 3 minutes 16
• Low battery warning 8
2.2 Alarms
Alarms are given to the diver visually by flashing
symbols, letters or figures.
An alarm occurs in the following situations (more
information can be found on the listed pages):
Page
• Oxygen toxicity reaches 100% 15
• Ignored decompression 17
• Exceeding the prescribed ascent rate 14
• Low battery alarm 8
WARNING
Serious injury or death may result from failing to immediately respond to
alarms given by Aladin®
ONE.
3 Preparation for the dive
Aladin® ONE is set to 21% oxygen (air) from the factory. If you wish to change this or any other setting, you
need to do so using the SmartTRAK software and the infrared interface. Chapter III describes the most
common settings. On the next page you will find an overview with all possible Aladin® ONE settings and page
references.
3.1 Setting the gas mixture
Before every dive and after changing the tank, make sure that the settings
for the gas mixture correspond with the current mixture used. An incorrect
setting causes Aladin® ONE to miscalculate this particular dive. If the fraction
of oxygen is set too low this can lead to oxygen poisoning without warning.
If the value is set too high decompression sickness may occur. Inaccuracies in
the calculations are carried over to repetitive dives.
The setting of the gas mixture can be changed only via SmartTRAK.
• After changing the gas mixture with SmartTRAK you have to click in the top row on
the
"write" icon, otherwise the setting will not be written to the Aladin® ONE.
• The time to reset the O2% mix to air can be set with SmartTRAK between 1
and 48 hours or to "no reset" (default).
WARNING
"Write"

Resetting the remaining saturation
Diving after a reset of the remaining saturation may lead you into
potentially
hazardous situations which could result in death or serious injury.
After a reset of the remaining saturation do not dive for at least 48 hours.
If you dive after resetting the remaining saturation the computer will miscal-
culate your decompression, which may result in serious injury or death.
Reset the remaining saturation only if you know you will not be diving, flying
or going to higher altitude for the next 48 hours.
Resetting the desaturation should only be done when there is a valid reason,
e.g. loaning the computer to somebody who has not dived in 48 hours or
more. When the computer itself has remaining saturation you must assume full
responsibility for the consequences of resetting the remaining saturation.
WARNING
12
3 Preparation for the dive
III UWATEC® Aladin® ONE
STOP
S
L
O
W
NO
DECO
CNS O
2
%
DEPTH
NO STOP
DIVE TIME
DESATAMPM
STOP
3.2 Preparation for the dive and function check
Check the display:
Switch on Aladin® ONE by bridging the water contacts and check the test dis-
play: Are all elements of the display activated? Do not use Aladin® ONE if the
display does not show all elements.
Check the displayed O2% mix:
It is absolutely necessary to check the set mixture before each dive and to
compare it to the gas mixture currently used. Always remember: setting an
incorrect mixture carries an inherent risk of decompression sickness and/or
oxygen toxicity! Maximum deviation from the measured mixture must not
exceed 1% O
2
. An incorrect gas mixture can be lethal!
WARNING
3.3 Overview Aladin® ONE settings
Configure Aladin® ONE with SmartTRAK according to your needs.
Setting
• Setting the gas mixture
• Time limit to reset the O2% mix to air
• Unit system
• Reset desaturation
• UTC (Universal Time Change) zone
• Time of day
• 24 or AM/PM setting
• Date
• Display contrast
Range
21-50% O2
no reset / 1 - 48 hrs.
metric/imperial
on / off
±13 hrs., increments: 15 min.
hours:minutes
1 (low) -12 (high)
Default
21% O2
no reset
no reset
GMT
4
Page
->11
->12
->8
UTC (Universal Time Change) zone: this setting allows you to set the watch to a new time zone without
affecting the actual time setting.

13
4 Functions during the dive
III UWATEC® Aladin® ONE
III
English
4.1 Immersion
After immersion, starting at a depth of about 0.8 m (3 ft), all diving functions are monitored, i.e. depth and
dive time displayed, maximum depth stored, saturation of tissues calculated, no-stop time or decompres-
sion prognosis determined, ascent rate controlled and displayed and the correctness of the decompression
procedure supervised.
4.2 Phosphorescent display
Aladin® ONE is equipped with a phosphorescent display. To excite the phosphorescence, shine your dive
torch onto the display for a few seconds. The display will glow for about one minute depending on the
strength of your dive torch and how close it was held to the display.
4.3 Dive time
The whole time spent below a depth of 0.8m (3 feet) is displayed as dive time
in minutes. The time above 0.8m (3 feet) is counted as dive time only if the
diver descends again below 0.8m (3 feet) within 5 minutes.
While the dive time is running, the colons on the right of the figures are flash-
ing in one second intervals. Maximum dive time displayed is 199 minutes.
If a dive lasts longer than 199 minutes the dive time display starts
again at 0 minutes.
4.4 Current depth / O2% mix
Current depth is given in 10 cm increments (1 foot).
At a diving depth of less than 0.8 m (3 ft) the display shows
"– – –".
The O2% mix is diplayed as long as CNS O2% = 0 and no ascent speed is
indicated.
Depth measurement is based on salt water. Therefore, Aladin® ONE
shows a slightly shallower depth than actual when diving in fresh
water. No calculation however is affected.
DEPTH
NO STOP
DIVE
TIME
S
L
O
W
DEPTH
NO ST
OP
DIVE
TIME
?
DEPTH
DIVE
TIME
Current depth
Dive time
O2% mix
Nitrogen loading bar
4.5 Maximum depth / Temperature
In the lower left corner of the screen Aladin® ONE displays the water tempera-
ture and the maximum depth alternating every 4 seconds.
Maximum depth is only displayed if it exceeds the current depth by more than
1 m (3 feet) (maximum depth indicator function).
CNS O2%
DEPTH
NO ST
OP
DIVE
TIME
Maximum depth
CNS O2%

14
4 Functions during the dive
III UWATEC® Aladin® ONE
4.6 Ascent rate
Optimal ascent rate varies depending on depth between 7 and 20 m/min (23
and 66 ft/min). It is displayed in the lower right corner as a percent of the
reference variable ascent rate.
If the ascent rate is greater than 100% of the set
value, the black arrow "SLOW" appears.
Reduce ascent rate.
If the ascent rate exceeds 140%, the arrow "SLOW"
starts flashing.
Reduce ascent rate.
The prescribed ascent rate must be observed at all times! Exceeding the pre-
scribed ascent rate can lead to microbubbles in the arterial circulation which
can lead to serious injury or death due to decompression sickness.
• In case of an improper ascent Aladin® ONE may require a decompression stop
even within the no-stop phase because of the danger of microbubble formation.
• The decompression duration necessary for the prevention of microbubbles can
increase massively if the ascent rate is exceeded.
• From great depth a slow ascent may cause heightened saturation of tissues
and an extension of both decompression duration and total ascent time.
At shallow depth, a slow ascent may shorten the decompression duration.
• Display of the ascent rate has the priority over "CNS O
2
".
• Excessive ascent rates for longer periods are entered in the logbook.
WARNING
S
L
O
W
DEPTH
NO STOP
DIVE TIME
Ascent rate
WARNING
WARNING
The following ascent rates correspond to the 100% value in Aladin® ONE.
depth (m) <6 <12 <18 <23 <27 <31 <35 <39 <44 <50 >50
speed (m/min) 7 8 9 10 11 13 15 17 18 19 20
depth (ft) <20 <40 <60 <75 <88 <101 <115 <128 <144 <164 >164
speed (ft/min) 23 26 29 33 36 43 49 56 59 62 66

English
15
4 Functions during the dive
III UWATEC® Aladin® ONE
III
4.8 Oxygen toxicity (CNS O
2
%)
Aladin®
ONE calculates oxygen toxicity from depth values, time and the gas
mixture and displays it in the lower right corner. The toxicity is expressed in 1%
increments of a maximum tolerated value (O
2
clock).
The symbol "CNS O
2
" is displayed together with the percentage.
The symbol "CNS O
2
" flashes if oxygen toxicity
reaches 75%.
Ascend to shallower depth to decrease oxygen
loading and consider terminating the dive.
When oxygen toxicity reaches 100%, "CNS O2"
and the percentage value flash.
Danger of oxygen toxicity!
Start procedure for terminating the dive.
• During the ascent, the display of the oxygen toxicity is replaced by the ascent
rate. If the ascent is stopped, the display changes back to the indication of the
CNS value.
• Aladin® ONE will display CNS O
2
% values exceeding 199 % with 199 %.
CNS O2%
DEPTH
NO ST
OP
DIVE
TIME
CNS O2%
DEPTH
NO STOP
DIVE TIME
CNS O2%
DEPTH
NO STOP
DIVE TIME
WARNING
WARNING
Oxygen toxicity
Max. Operating Depth MOD
4.7 Partial pressure of oxygen (ppO
2 max
) / Maximum Operating Depth (MOD)
The
maximum partial pressure of oxygen ppO
2 max
(1.4 bar) determines the Maxi-
mum Operating Depth (MOD). Diving deeper than the MOD will expose the
diver to oxygen partial pressures higher than the set maximum level.
The MOD is a function of ppO
2 max
and the mixture
used. If during the dive the MOD is reached or
exceeded Aladin® ONE displays the MOD (flashing)
in the lower left corner.
Ascend to a depth shallower than the displayed
MOD in order to diminish the danger of oxygen
poisoning.
The MOD should not be exceeded. Disregarding the warning can lead to
oxygen poisoning.
CNS O2%
DEPTH
NO STOP
DIVE TIME
WARNING
WARNING

4.9 Nitrogen loading bar graph
The nitrogen loading bar gives a graphical representation of how close to decompression you are. As you
absorb nitrogen during the dive, more and more segments of the bar will light up. Depending on your
depth, the segments can light up more or less rapidly.
** Depending on your profile, the no-stop time may drop below 3 minutes before the upper 5 segments
are lit. In this case, only those segments that are lit will flash.
If you have entered decompression, the 6th segment will turn off as soon as you complete your last decom-
pression obligation to indicate that you are no longer in decompression.
4.10 Decompression information
NO STOP and the no-stop time (minutes) are displayed if no decompression stops are necessary.
• No-stop display "99:" means remaining time of 99 minutes or
more.
• No-stop time is calculated on line and influenced by the current
water temperature
If no-stop time drops below 3 minutes, the no-
stop value and the nitrogen loading bar begin to
flash.
If no-stop time is less than 1 minute, the no-stop
display shows the flashing value "0".
In order to prevent a decompression dive, ascend
slowly until the no-stop time is 5 minutes or more.
Dives that require decompression stops are not
recommended.
16
4 Functions during the dive
III UWATEC® Aladin® ONE
DEPTH
NO ST
OP
DIVE
TIME
CNS O
2
%
No-stop time
Nitrogen loading bar
No-stop time less
than 1 minute
WARNING
WARNING
CNS O2%
DEPTH
NO STOP
DIVE TIME
Decompression values On entering the decompression phase, "NO STOP" disappears and the
STOP
DECO
symbol appears. The nitrogen loading bar stops flashing and the 6th segment
lights up (red area). The deepest decompression stage in metres (feet) is dis-
played and the decompression stop duration of the displayed stage appears
in minutes. The display "7: 3m (10ft)" means that a decompression stop of 7
minutes at a depth of 3m (10ft) has to be made.
When a decompression stop has been completed, the next (shallower) decom-
pression stop is displayed. When all decompression stops have been completed,
the
STOP
DECO
symbol extinguishes, "NO STOP" and no-stop time reappear.
Deco stop depths deeper than 27m (90 ft) are displayed as "– – : – – ".
CNS O2%
DEPTH DIVE TIME
STOP
DECO
Decompression
depth
Decompression
stop duration
Decompression obligation
1-3 segments
(green area):
you are safely
within the no-stop
range
4-5 segments (yellow area):
you are approaching decom-
pression. When the no-stop
time drops below 3 minutes
the 5 segments will start
flashing.**
6 segments (red area): you now
have mandatory decompression
obligation(s) which you must
observe before reaching the
surface.

English
17
4 Functions during the dive
III UWATEC® Aladin® ONE
III
The decompression alarm is activated if the
decompression stop is ignored. The arrow
STOP
DECO
,
the decompression stop duration and decompres-
sion stop depth begin to flash.
Due to the formation of microbubbles, decompression can increase massively
if a decompression stop is ignored. When the surface is reached during the
decompression alarm, the arrow
STOP
DECO
, the decompression stop duration
and decompression stop depth
continue flashing, in order to point to the
risk of a decompression accident. The SOS mode is activated 3 minutes after
the dive if corrective action is not taken (->19).
If the total (cumulative) duration of the decompression alarm is longer than
one minute, it is entered in the logbook.
Descend to the prescribed decompression stop depth immediately!
Total time of ascent
As soon as decompression stops are necessary Aladin® ONE shows the total time
of ascent. This includes the ascent time from the current depth to the surface and
all decompression stop obligations.
The total time of ascent is calculated on the basis of the prescribed
ascent rate. Total time of ascent can be subject to change if the ascent
rate is not ideal (100%).
Ascent time greater than 99 minutes is displayed as "– –".
On all dives with Aladin®
ONE, make a safety stop for
at least three minutes at a depth of 5 m (15 feet).
STOP
DECO
CNS O2%
DEPTH DIVE TIME
STOP
NO
DECO
CNS O
2
%
DEPTH
DIVE
TIME
Total ascent time
Ignored decompression
alarm
WARNING
WARNING
5 Functions at the surface
5.1 End of a dive
After reaching the surface (<0.8 m/3 ft) Aladin® ONE remains in dive mode for 5
minutes. The delay allows for surfacing for a short period for orientation.
After 5 minutes the dive is closed and it is entered into the logbook.
Aladin® ONE then displays the logbook of the dive and desaturation information
->18.
For the calculations of the desaturation it is
assumed that the diver breathes air while on the
surface.
DEPTH
DIVE
TIME
CNS O
2
%
WARNING
Depth less than
0.8 m (3 ft)
4.11 3-minute safety stop timer
The safety stop timer displays the time span a diver should spend at the safety
stop depth at the end of the dive.
The timer is activated automatically when the diver, after having reached a
depth of at least 10m (30ft), returns to a depth of 5m (15ft) while the no-stop
time is 99 minutes. The safety stop timer will switch off automatically if the
diver descends past 6.5m (20ft) but will restart from 3 minutes as soon as the
diver returns above 5m (15ft).
Safety stop
icons
Remaining
time span
STOP
CNS O2%
Minutes
Seconds
DEPTH DIVE TIME

18
5 Functions at the surface
III UWATEC® Aladin® ONE
WARNING
WARNING
5.2 Logbook
5 minutes after a dive Aladin® ONE shows the logbook information of the dive
(maximum depth, dive time, temperature, O
2
%), the surface interval, the "do
not dive" icon (if applicable) and the residual nitrogen loading as a bar graph.
In addition to the screen logbook,
Aladin® ONE records the profiles of about 25
hours of diving. This information can be transferred to a PC with the standard
infrared interface (IrDA) and the Windows
®
software SmartTRAK. Note that a
dive is recorded only if the dive time is longer than 2 minutes.
The display switches back to the time of day display (->8) after the computer is
completely desaturated. If before complete desaturation the nitrox reset time
elapses or the dive computer is interrogated via the infrared interface, the dis-
play also switches back to the time of day display.
DEPTH DIVE TIME
NO
Residual nitrogen bar
Do not dive
(Microbubble warning)
Duration of surface interval
(only during desaturation)
Surface interval icon
Dive time
Maximum depth
O
2
mix
Lowest temperature
Aladin® ONE does not display a No-Fly time. To
prevent decompression sickness or death, you
must wait at least 24 hours after your last dive
before flying.
If the <microbubble warning (NO DIVE)> is visible
during the surface interval, the diver should not
undertake another dive.
The segments in the residual nitrogen bar graph will gradually turn off as
Aladin® ONE follows the offgassing of your tissues during your surface interval.
There is a 1:1 equivalence in the meaning of the segments between diving and
surface. Thus, on a repetitive dive the bar will resume from its status on the
surface just prior to the dive. There are two exceptions however:
• the uppermost segment will stay lit until the desaturation time is completely
extinguished. This is done to show that there is desaturation time left and that
a dive started at this point will be logged as a repetitive dive. If the remaining
desaturation time is very short, this segment could however at first disappear
during the dive;
• during the 24 hours of an SOS-lock, all segments will stay on.
Microbubble warning
Through repetitive dives microbubbles accumulate in the lungs if the surface inter-
val is not long enough. Ignoring decompression stops or ascending at an exces-
sive rate can also lead to microbubbles in tissues. In order to reduce the risk of
decompression sickness for repetitive dives, the surface interval should be planned
long enough. If Aladin®
ONE calculates that the formation of microbubbles occurs
during the surface interval, it will advise a diver to extend the surface interval via
the microbubble warning.
If the dive is made in spite of the microbubble warning, the diver must cope with
a clearly shorter no-stop time or an extension of decompression. Also, the duration
of the microbubble warning at the end of the dive can increase considerably.
Microbubble
warning
NO

English
19
6 SOS mode
III UWATEC® Aladin® ONE
III
Activation: automatic
If the diver remains above a depth of 0.8m (3 feet) for more than three minutes
without observing a prescribed decompression, the computer will automatically
switch into SOS mode after the dive.
While in SOS mode, the computer cannot be used for diving.
The SOS mode will be unlocked after 24 hours.
Diving within 48 hours after the end of an SOS mode will result in shorter no
stop times or longer decompression stops.
The dive will be entered in the logbook with "SOS".
• Serious injury or death may result if a diver does
not seek immediate treatment should any signs
or symptoms of decompression sickness occur
after a dive.
• Do not dive to treat symptoms of decompression sickness!
• Diving in SOS mode is extremely dangerous and you must assume full
responsibility for such behaviour. UWATEC will assume no liability.
A diving accident can be analyzed at any time in the logbook and downloaded
to a PC by means of the infrared interface (IrDA) and SmartTRAK software.
NO
NO
DESAT
WARNING
Time remaining until SOS
mode switches off automati-
cally
Maximum
depth
Dive time

20 III UWATEC® Aladin® ONE
7 Diving in mountain lakes
NO
7.2 Decompression dives in mountain lakes
In order to assure optimal decompression even at higher altitudes, the 3m (10
ft) decompression stage is divided into a 4 m (13 ft) stage and a 2 m (7 ft) stage
in altitude ranges 1, 2 and 3. The prescribed decompression stop depths are, in
sequence, 2m / 4m / 6m / 9m… (7 ft / 13 ft / 20 ft / 30 ft…).
If atmospheric pressure is below 620 mbar (8.99 psi) (altitude higher than
4100 m / 13450 ft above sea level), no decompression data is calculated and
displayed (automatic gauge mode).
DEPTH DIVE
TIME
Dive at altitude range 4:
• no deco data
(autom. gauge mode)
4000 m
13120 ft
2000 m
6560 ft
1000 m
3280 ft
3000 m
9840 ft
0 m
905 mbar
13.12 psi
815 mbar
11.82 psi
725 mbar
10.51 psi
610 mbar
8.85 psi
Switching
at approx.
No deco data
Altitude symbol
Time interval since the last
change in altitude class
Desaturation
information
7.1 Altitude ranges Aladin® ONE measures the atmospheric pressure every 60 seconds even
while the display is switched off. If the computer detects a sufficient
increase in altitude, it switches on automatically and indicates the alti-
tude symbol, the
adaption time (desaturation time) as a bar graph and the
time interval since the change in altitude class
. Desaturation time refers to
adaptation time at this altitude. If the dive starts within this adaptation time,
Aladin® ONE treats it as a repetitive dive, since the body is offgassing.
Altitude is divided into five ranges, which are influenced by barometric pres-
sure. That is why the defined altitude ranges overlap on their fringes. If a
mountain lake is reached, the stylised mountain symbol lights up to indicate
that the Aladin
ONE is now in altitude mode, without differentiation between
the various ranges. The actual altitude range can be seen after downloading
Aladin ONE to a PC via SmartTRAK. Sea level to an altitude of approximately
1000m (3300 feet) is not indicated. In the following diagram, you can see the
approximate breakdown of the altitude ranges :