Scubapro-uwatec ALADIN PRO NITROX User Manual

THE SYSTEM

®

depth

O

% MIX

2

NO STOP

max. depth

®

OPERATING MANUAL

American

dive time

deco info

Feet

SWISS MADE BY UWATEC AG

Safety considerations

You must carefully read this entire manual before using your Aladin® Pro Nitrox.

Diving has many inherent risks. Even if you follow the instructions of
this manual in a careful fashion, it is still possible that you may be

WARNING

The Aladin® Pro Nitrox is a decompression tool to assist a trained and certified diver in making decisions
concerning dive planning and execution. As with any tool, the Aladin® Pro Nitrox may be misused if
the following safety and operational precautions are not strictly followed. If they are followed, car eful
use of the Aladin® Pro Nitrox can increase your diving enjoyment and reduce your risk of decompr ession
sickness. If they are not, you will be placing yourself at serious risk for decompression sickness.
While the Aladin® Pro Nitrox is a technically advanced tool based on biophysical models of decompression
sickness and oxygen toxicity, neither it nor any other diving computer (or table) can actually monitor
the physiological changes that occur in your body as you dive. In addition, each diver will vary in his or
her susceptibility to decompression sickness. Not only that, but each individual diver‘s own susceptibility
may vary from day to day . Combined with the fact that decompression modelling is an inexact science,
and of necessity must be based at least partly on certain unproven assumptions, it is incumbent upon
you, the individual diver , to dive responsibly and to carefully follow all standar d safe diving practices as
well as the admonitions contained in this manual.

Operating Manual Aladin® Pro Nitrox

seriously injured or die from decompression sickness, oxygen toxicity or
some other inherent risk of scuba nitrox. Unless you are fully aware of
these risks and are willing to personally accept and assume
responsibility for those risks, do not use the Aladin® Pro Nitrox!

B

Aladin® Pro Nitrox–The Diving System

depth

dive time

max. depth

DIVE

deco info

®

–+ E

Interface and logbook-software
DataTrak (Option) Dive Computer Aladin® Pro Nitrox

B

C

Operating Manual Aladin® Pro Nitrox

Operating Manual Aladin® Pro Nitrox

Important remarks concerning signal words and symbols

This operating manual makes use of the following icons to indicate especially important comments:

Remarks: Informations and tips which are important for optimal use of the functions of

your Aladin® Pro Nitrox.

WARNING

– + E

D

Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.

The following symbols are used in the operating manual:

flashing display

acoustic alarm signal

B

Operating instruction for manual input
(Example: bridging contacts B and E)

February 1996, Copyright by Uwatec Switzerland

Operating Manual Aladin® Pro Nitrox

Safety considerations

Guidelines for the use of Aladin® Pro Nitrox:

The following guidelines for using Aladin® Pro Nitrox 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
will not occur.

– The Aladin® Pro Nitrox is designed for dives made with nitrox and compressed air ( 21% O2) only . Do not use

the Aladin® Pro Nitrox for dives made other mixed gases.

– It is absolutely necessary to check the set mixture before each dive and to compare it to the gas mixture

actually used.

Always remember: Setting a wrong mixture cause either insufficient decompression calculations or a too

low calculation of the oxygen-toxicity!

– In accordance with the recommended maximum diving limit of all instructional agencies, do not dive

deeper than 130 feet.

– Always check the diving limits given by the used share of oxygen.

– Do not use the Aladin® Pro Nitrox for planned decompression diving. The decompression algorithm contained

in the Aladin® Pro Nitrox should be used only for emergency or unintended decompression.

Operating Manual Aladin® Pro Nitrox

E

Safety considerations

– On all dives with the Aladin® Pro Nitrox, make a safety stop for three to five minutes within the ten to thirty

feet zone.

– Never use the Aladin® Pro Nitrox for repetitive, “square“ dives deeper than 60 feet. A squar e dive is a dive

that is performed for its duration at a uniform depth.

– Always make the deepest dive of the day first when repetitive dives are planned, and for each successive

dive make sure that the deepest portion of that dive is done at the beginning of the dive.

– All divers using dive computers to plan dives and indicate or determine decompression status must use

their own computer.

– If the Aladin® Pro Nitrox 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) should be initiated immediately .

– On any given dive, all divers in a buddy group must follow the most conservative dive computer for that

particular dive.

– You should not dive for a period of twenty-four hours before activating the Aladin® Pro Nitrox to use it to

plan or control your diving.

F

Operating Manual Aladin® Pro Nitrox

Safety considerations

– You MUST follow the ascent rates as indicated by the Aladin® Pro Nitrox, and should the computer fail for

any reason, you must ascend at a rate of no greater than 60 feet per minute.

– Y ou MUST be familiar with all signs and symptoms of decompr ession sickness before using the Aladin® Pro

Nitrox! Seek IMMEDIATE treatment for decompression sickness should any of these signs or symptoms
occur after a dive! There is a direct correlation between the efficacy of treatment and the delay between
the onset of symptoms and the treatment for decompression sickness.

– Always observe the optical and acoustic alarm signals of the Aladin® Pro Nitrox. Avoid situations of incr eased

risk which are marked with a warning sign in this operating manual.

– Never dive the Aladin® Pro Nitrox to the limit. Neither the Aladin® Pro Nitrox, nor any other diving computer

or decompression table should be pushed to its limit. Give yourself a margin of safety by always leaving at
least a few minutes in the “no-stop“ box before making your ascent.

– Avoid repeated ascents and descents (yo-yo diving) while using the Aladin® Pro Nitrox.

Operating Manual Aladin® Pro Nitrox

G

LIST OF CHAPTERS

I INTRODUCTION 1

II ALADIN® PRO NITROX – THE SYSTEM 13

III DIVING WITH ALADIN® PRO NITROX 31

IV DIVING AT REDUCED RISK WITH ALADIN® PRO NITROX 57

V LOGBOOK 67

VI DIVE PLANNER 73

VII INTERFACE 83

VIII TROUBLE SHOOTING 87

IX APPENDIX,

Maintenance, Technical Information, Warranty

91

I

II

III

IV

V

VI

VII

VIII

IX

I INTRODUCTION

1. Aladin® Pro Nitrox: Your Personal Companion ______________________________________ 2

2. Aladin® Pro Nitrox ______________________________________ 3

3. Aladin® Pro Nitrox – Reducing Risks of

Decompression Sickness ______________________________________ 7

4. The Calculation Model ZH-L8 ADT 4.1 Description_________________________ 9

4.2 Advantages _______________________ 11

5. Safety in Diving _____________________________________ 12

I Introduction

1

I

1. Aladin® Pro Nitrox – Your Personal Companion

What can further increase your diving pleasure? The
good feeling of having the highest possible safety and
freedom to move. A dive computer which constantly
controls the data of your dive and your individual
behavior meets these requirements.
Aladin® Pro Nitrox watches
over the nitrogene and
oxygene saturation of your
body without interruption.
With Aladin® Pro Nitrox you
dive more safely than ever before. In addition,
Aladin® Pro Nitrox offers an unmatched comfort
in carrying and operation. Aladin® Pro Nitrox
gives you increased safety
due to the new calcula­tion model. All in­formations necessary
for safe diving are
combined in one in­strument. The Aladin
Pro Nitrox can increase

®

both your diving pleasure and safety by reducing
your risk of decompression sickness provided you

carefully follow the instructions and

guidelines given you in this manual.

Unlike previous diving computers,
which only base their decompressin

information on depth and time data,

the Aladin® Pro X
Nitrox also considers

temperature, which

is known to be additional

risk factor for decompression sickness.

Aladin® Pro Nitrox allows you to plan and

execute dives with a greater degree of safety

than with previous models of decompression

computers.

Please read this operating manual carefully and
to the last page.

2

I Introduction

2. Introduction Aladin® Pro Nitrox

Nitrox is a gas mixture consisting of nitrogen and
oxygen. The kind of air used for diving with
compressed air is the same as the normal air of the
earth‘s atmosphere (78% nitrogen, 21% oxygen and
1% inert gases). Therefore, normal air is also Nitrox!

When talking of Nitrox as the breathing gas for diving,
it concerns a mixture with a higher share of oxygen.
A higher share of oxygen (and automatically the
reduction of the share of nitrogen) has the advantage
of lengthening the no-stop phase (or reducing the
decompression phase), since less nitrogen is dissolved
in the diver‘s body during the dive.

But the higher share of oxygen in the Nitrox-mixture
also causes additional physiological problems by the
toxic effects at a higher partial pressure of oxygen
(ppO2). When breathing oxygen at a higher partial
pressure, two kinds of oxygen toxicity can occur:

I Introduction

I

CNS damages:
Symptoms of poisoning occuring at short notice in
the central nervous system(CNS). Such symptoms
are: irritations of the respiratory organs, sickness,
headache, pulmonary oedema, cramps, uncon­sciousness. The symptoms occur at a ppO2 of more
than 1 bar and depend on the term of exposure and
on the partial pressure of oxygen.

Damages of the lungs:
Symptoms of pulmonary poisoning occuring in the
long run. The symptoms occur at a ppO2 from 0.5 bar
and higher and with terms of exposure in the range
of days/weeks.

Aladin® Pro Nitrox considers the short term toxic effect
of oxygen (CNS damages) by means of the so called
„oxygen-clock“. It is based on a list which showa the
units of toxicity for oxygen per unit of time in
dependence of the ppO2. The indication of toxicity
uses „CNS O2 %“ (= relative toxicity of oxygen for

3

2. Introduction Aladin® Pro Nitrox

the central nervous system). CNS O2 0% corresponds
to the normal state before the first dive, and CNS O
100% corresponds to the critical upper limit. The list,
initially published by the US Navy , is nowadays known
by the names IANTD- orNOAA-list. We modified this
list for the use with Aladin NitroX in cooperation with
Dr. Bill Hamilton, Hamilton Research Ltd. (Tarrytown,
NY), a well-known specialist.

The long-term kind of oxygen poisoning has practically
no relevance for diving with independent diving
equipment and is therefore not considered in the
design of Aladin Nitrox.

The physiological peculiarities of oxygen and the
changing decompression due to the reduced share of
nitrogen require a profound training, if nitr ox is used
for diving. Additional technical problems with the use
and the maintenance of parts of the equipment bear
further dangers when diving with nitrox. Therefore,

we recommend to adhere to the following guidelines
by all means.

2

4

I Introduction

2. Introduction Aladin® Pro Nitrox

WARNING WARNING

I

1. Only dive with nitrox if you have been trained
thoroughly by a recognised institution.

2. Only use Aladin® Pro Nitrox with open breathing
systems. Aladin® Pro Nitrox must be set for a
determined gas mixture. In partially-open and
in closed circulation-systems, the gas mixture can
vary considerably. The calculations may yield
results different from those necessary for the
actual muxture.

3. Only use Aladin® Pro Nitrox for diving with an
indepent breathing apparatus. Aladin® Pro
Nitrox is not designed for long-term exposures
with Nitrox.

I Introduction

4. Aladin® Pro Nitrox always calculates consider­ing the gas mixture set by the user . It is absolu­tely necessary to check the set mixture before

each dive and to compare it to the gas mixture

actually used. Maximum deviation from the
measured mixture must not exceed 1% O2. A
wrong gas mixture can be lethal!

5. Aladin® Pro Nitrox disposes of a ppO2-warning,
the default-limits of which are set at 1.5 bar

max

ppO

. This limit can be adjusted via Interface/

2

Data Talk in the range of 1.2 to 1.95 bar. An
alternation of the ppO
bar is risky and we do not recommend it.

max

to higher than 1.6

2

5

2. Further Remarks on Aladin® Pro Nitrox

WARNING

6. Frequently check the „oxygen-clock“ (CNS O
Limit), especially in the range higher than 1.5
bar ppO2. Close the dive if the CNS O2 Limit
exceeds 75%.

7. Make sure you have a sufficiently long surface
interval, just as when diving with compressed
air. Oxygen also needs sufficient time to leave
the body. Go on the next dive only when the
CNS O2 Limit has dropped below 40%.

8. Of course, Aladin® Pro Nitrox is a personal

instrument like any other diving computer . This

also applies when diving with compressed air
between two nitrox®-dives. Aladin® Pro Nitrox
can be adjusted to compressed air (21% oxygen)

WARNING

2

and then also includes the calculation of the
CNS O2 Limit in the same way as with any other
nitrox-dive. Always remember: setting a wrong
mixture causes either insufficient
decompression calculations or a too low
calculation of the oxygen-toxicity!

6

I Introduction

3. Aladin® Pro Nitrox–Reducing Risks of Decompression Sickness

By considering your individual gas mixture, depth and
time profile and water temperature, the Aladin® Pro
Nitrox can be considered a personal diving control
instrument. Relying on the latest results of medical
and physiological research for its decompression
modeling, the Aladin® Pro Nitrox differs from earlier
diving computers in a number of significant ways:

I

WARNING

You must strictly observe all optical and acoustic
alarms and take appropriate action based upon
those alarms to avoid serious injury or death from
decompression sickness!

• The ZH-L8 ADT decompression calculation model

considers eight body tissues as well as the ambient
temperature. This allows for an even more precise
calculation of a modelled risk for decompression
sickness which can lead to greater diving safety.

• The Aladin® Pro Nitrox uses both optical and

acoustic alarms. The acoustic alarm uses varied
sound signals to assist in establishing the reason
for the alarm.

I Introduction

• By using the Aladin® Pro Nitrox‘s logbook, a diver
may directly call up information from the last 19
dives. When interfaced with a personal computer,
37 dives and 200 minutes of dive profile in intervals
of 20 seconds can be read out.

• The dive planner allows the advance planning of
no stop dives with readily determinable surface
intervals.

7

3. Aladin® Pro Nitrox - Reducing Risks of Decompression Sickness

WARNING

Although the Aladin® Pro Nitrox can be used to
plan decompression dives, such dives are beyond
the realm of recreational or sport diving and must
not be attempted by recreational or sport scuba
divers.

• The Aladin® Pro Nitrox is designed to be mounted
on the diver‘s left or right wrist, which offers the
maximum freedom of movement as well as easy
operation and use.

8

I Introduction

4. The Calculation Model ZH-L8 ADT

4.1 Description

The Aladin® Pro Nitrox uses a new decompression
calculation model known as the ZH-L8 ADT. This
model uses eight compartments or “tissue“ groups
with nominal half time periods from 5 to 640 minutes.
This model differs considerably from other
models by its consideration of the following
additional physiological processes:

1. Blood perfusion to the body‘s organs
is not constant. Skin and muscle tissues
are in particular subject to changes in blood
perfusion, depending on temperature and
work load. Changes in blood perfusion to these
organs change their nitrogen saturation tolerance.
The model used by the Aladin® Pro Nitrox takes
these effects into account and thus the “skin“ and
“muscle“ compartments in the Aladin® Pro Nitrox
show variable half-time periods and saturation
tolerances.

Decompression information is calculated

I Introduction

I

according to the diver‘s individual behavior and
decrease in skin temperature. The decrease in
skin temperature is based upon the water
temperature and the dive time. By considering

these changes in saturation, the

time that must

be spent at

the

surface

prior
to

flying

can be

considerably

lengthened, depending

upon the depth, time,

and temperature of a
dive, as well as the

diver's behavior during that dive.

9

4. The Calculation Model ZH-L8 ADT

2. The decompression model used by the Aladin® Pro
Nitrox considers nitrogen in both its dissolved as
well as its gaseous phase (microbubbles). Formati­on of microbubbles is considered to be a strong
indicator of a high risk of decompression sickness.
The Aladin® Pro Nitrox model calculates the
formation of microbubbels depending on various
assumed influences in arterial and venous blood.
In normal, slow ascents, microbubbles form mainly
in venous blood. During fast ascents, microbubbles
may also form in arterial blood and in the body‘s
tissues as well. If a particular dive profile may result
in the creation of microbubbles according to the
Aladin® Pro Nitrox‘s model, decreased bottom time
and/or increased decompression times as well as
increased “no fly“ time will be indicated.

• Microbubbles can form if the diver makes too fast
an ascent, ignores required decompression stops,
or makes repeated ascents during a dive (yo-yo
diving). These microbubbles can form in arterial

blood as well as in the body‘s tissues. If these
microbubbles partially impair circulation, the rate
of gas diffusion and saturation tolerance for those
tissues immediately surrounding this area of
impaired circulation are changed. If requir ed, both
decompression time and RBT will be adjusted in
such a way that already existing microbubbles will
stop growing. Increased decompression time will
also assist those local areas of impaired circulation
to desaturate with less risk of decompression
sickness.

• The calculation of microbubbles results in altered
ascent instructions. If microbubbles are assumed
to be present based on the data used by the Ala­din® Pro Nitrox, the ascent rate to the surface is
reduced to 23 feet/minute. This will help prevent
the formation of microbubbles in the arterial
circulation and minimizes formation of micro­bubbles in the venous circulation after the dive.

10

I Introduction

4. The Calculation Model ZH-L8 ADT

4.2 Advantages

On the first dives following responsible diving
procedures, a diver using the Aladin® Pro Nitrox should
never be required to decompress, although a three to
five minute safety stop between ten and thirty feet is
recommended for every dive. If, however, unplanned
circumstances arise during the dive which increase the
risk of decompression, the Aladin® Pro Nitrox can, if
closely followed, reduce the risk of decompression
sickness by reducing remaining bottom time and/or
increasing decompression time. Some of the more
common risk situations are as follows:

• Repetitive dives, especially those deeper than 60
feet and those with short surface intervals.

• Repetitive dives using square dive profiles.

• Repetitive diving over the course of several
successive days.

• Diving in cold water.

• Y o-yo diving (repeated descents and ascents to the
surface during a given dive).

I Introduction

I

• Flying within 24 hours after diving.

If a diver experiences any of these risk factors while
diving, the Aladin® Pro Nitrox will add required
decompression time in order to help minimize the risk
of decompression sickness.

WARNING

Do not use the Aladin® Pro Nitrox for planned
decom-pression dives!

If signs or symptoms of decompression sickness occur
after diving with Aladin® Pro Nitrox, seek IMMEDIA TE
treatment at the nearest recompression facility.

11

5. Safety in Diving

With its new decompression model, the Aladin® Pro
Nitrox is an extremely versatile tool which can increase
your diving comfort and safety. As with any diving
tool, however , ultimate responsibility for diving safety
remains with the individual diver . The same responsible
diving practices taught by all diving certification
agencies are still absolutely necessary in order to safely
dive with the Aladin® Pro Nitrox.

Certain mistakes which may be made by a diver , such
as ascending at an excessive rate, going too deep, or
staying too long at depth, may be overcome if the
diver carefully follows the Aladin® Pro Nitrox‘s
corrected ascent instructions. Of course, the Aladin
Pro Nitrox can do nothing to prevent the occurrence
of lung overexpansion injuries or nitrogen narcosis,
whose avoidance lies solely with the individual diver.
The Aladin® Pro Nitrox is a highly sophisticated
technical instrument which, if used and maintained
properly , will have high r eliability. Despite this no dive
should be made with an Aladin® Pro Nitrox without a

thorough understanding of decompression theory and
dive table use, and every diver must have a set of
decompression tables with him on every dive.

WARNING

Do not use the Aladin® Pro Nitrox without a set
of accepted nitrox diving tables with you as a back
up decompression tool on every dive.

Should decompression sickness occur, whether the

®

Aladin® Pro Nitrox was used correctly or not, a detailed
history of the previous dives may be used to allow a
better diagnosis and the most effective treatment for
the diver.

12

I Introduction

II ALADIN® PRO NITROX – THE SYSTEM

1. Description _____________________________________ 14

2. Dive Computer 2.1 Operation _____________________________ 16

2.2 Operating scheme for surface functions ____ 17

2.3 Operating modes_______________________ 23

II Aladin® Pro Nitrox - The System

13

II

1. Description

depth

.

NO STOP

max. depth

®

deco info

dive time

The Aladin® Pro Nitrox system consists of three units:

1 The dive computer displays only the important

general dive- and decompression data.

1

depth dive time

CNS O

LIMIT

2

%

NO STOP

max. depth deco info

14

II Aladin® Pro Nitrox - The System

1. Description

2 The dive computer has a data memory which stores the dive data. The data can be transmitted to a MS-

DOS personal computer with the logbook program DataTrak via an interface (available as an option).

2

depth

dive time

max. depth

DIVE

deco info

®

II

II Aladin® Pro Nitrox - The System

15

2. Dive Computer

2.1 Operation
Switching on display: – automatically, on submerging in water or when adaptation to atmospheric

pressure is necessary.

– manually by manipulating contacts on housing.

Switching off display: – automatically, after three minutes without operation.

Aladin® Pro Nitrox has 4 operating contacts B, E, +, – on the outside of the housing. For manual operation,
touch base contact B and any one of the other three contacts above the display with moistened fingers.

–

16

max. depth

depth

B

dive time

Contact B: Base contact, which has to be touched for all

operations.

Contact E: Enter contact. It serves the switching on of the

deco info

®

computer, the activation of logbook and dive-plan
mode and the switching between no-stop and
decompression planning. It is also used to confirm
inputs and is therefore comparable to the ENTER- or

+

E

RETURN-key of a computer.

+ / – contacts: They initiate the selection of the logbook and dive-

plan as well as the setting of values (time, depth, dive­number etc.).

II Aladin® Pro Nitrox - The System

2. Dive Computer

depth

dive time

deco info

max. depth

2.2 Operating scheme

for surface
functions

6

Input stage

DIVEPLAN

DIVEPLAN

II Aladin® Pro Nitrox - The System

(or 3min)

(or 3min)

depth

dive time

max. depth

deco info

depth

dive time

max. depth

deco info

B and E B and + B and –

Sleep

1

Surface Sleep

5 4

Input stage Input stage

O2 % MIX

O2 % MIX

(or 3min) (or 3min)

(or 3min)

3s

2

Ready or

Surface

automatically

depth dive time

NO STOP

max. depth deco info

3

Battery

capacity

LOGBOOK

(or 3min)

5sec

LOGBOOK

II

17

2. Dive Computer

1

depth dive time

max. depth deco info

2

depth dive time

O2 MIX

max. depth deco info

depth dive time

O2 MIX

max. depth deco info

Ready-mode Surface-mode

3

depth dive time

max. depth deco info

18

DESATURATION

DO NOT FLY

CNS O

1. Aladin® Pro Nitrox is in a state of rest; no
information is displayed (-> sleep-mode or ->
surface-sleep-mode).

depth

dive time

max. depth

deco info

2. Bridging B and E activates the display -> ready-

h

LIMIT

2

%

h

mode or -> surface-mode.

depth

dive time

max. depth

deco info

3. A second bridging of contacts B and E activates
the display of the remaining battery capacity for
approximately 5 seconds.
As soon as the battery capacity is 0%, a battery
alarm is sent (see page 39).
There is still a small reserve left at bAt 0%.

II Aladin® Pro Nitrox - The System

2. Dive Computer

4

depth dive time

O2 % MIX

max. depth deco info

Ready-mode Surface-mode

depth dive time

LOGBOOK

max. depth deco info

depth dive time

LOGBOOK

max. depth deco info

II Aladin® Pro Nitrox - The System

depth dive time

DO NOT FLY

CNS O

LIMIT

2

%

O2 % MIX

DESATURATION

max. depth deco info

h

h

depth

h

dive time

max. depth

deco info

II

4.a) Selecting the logbook function:

B and +
Cancel: B and –
or automatically after three minutes

depth

dive time

max. depth

deco info

4.b) Activating the logbook:

B and E. Aladin® Pro Nitrox shows the most recent
dive.

19

2. Dive Computer

5

20

depth dive time

LOGBOOK

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

depth dive time

DO NOT FLY

CNS O

LIMIT

2

%

O2 % MIX

DESATURATION

max. depth deco info

h

Ready-mode Surface-mode

or after
3 minutes

depth dive time

O2 MIX

max. depth deco info

depth

dive time

max. depth

deco info

4.c) Leaving the logbook:

B and E
or automatically after three minutes.

h

depth

dive time

max. depth

deco info

5. a) Selecting the O2% Mix function:

B and –.
Cancel: B and +:
or automatically after three minutes.

II Aladin® Pro Nitrox - The System

2. Dive Computer

depth dive time

O2 MIX

max. depth deco info

5.b) Activating the O2% Mix function:

B and E
By B and + or B and – the portion of oxygen is set.

depth

dive tim

e

max. depth

deco info

II

depth dive time

O2 % MIX

max. depth deco info

Ready-mode Surface-mode

II Aladin® Pro Nitrox - The System

depth dive time

DO NOT FLY

CNS O

LIMIT

2

%

O2 % MIX

DESATURATION

max. depth deco info

h

5.c) Leaving the O2% Mix function:

h

B and E
or automatically after three minutes
(new setting is not accepted).

21

2. Dive Computer

6

22

2x

depth dive time

DIVEPLAN

max. depth deco info

depth dive time

DIVEPLAN

NO STOP

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

2x

3s

or after 3 minutes

depth dive time

DO NOT FLY

h

CNS O

LIMIT

2

%

O2 % MIX

DESATURATION

max. depth deco info

h

6.a) Selection of dive-plan function

From ready or surface mode:
Twice B and –
ancel: Twice B and +
or automatically after three minutes without operation.

6.b) Activating the dive-plan

B and E. Aladin® Pro Nitrox starts by listing no-stop
times. If the dive-plan is activated out of the surface­mode, first enter the desired interval by B and + or
B and –. Confirmation with B and E.

6.c) Leaving the dive-plan:

B and E for approx. 3 seconds:
or automatically after three minutes.

II Aladin® Pro Nitrox - The System

2. Dive Computer

2.3 Operating modes Aladin® Pro Nitrox works in various operating modes:

depth dive time

max. depth deco info

depth dive time

O2 % MIX

S
L
O
W

DESATURATION

DECOSTOP

NO STOP

DO NOT FLY

DIVEPLAN
LOGBOOK

CNS O

SPEED

h

LIMIT

2

%

ft
h
m

max. depth deco info

II Aladin® Pro Nitrox - The System

Sleep-mode:

Activation: automatically
When Aladin® Pro Nitrox is not used, it is in the sleep-mode.
The display does not show any information. The computer is briefly activated
once every minute to measure atmospheric pressure. The display remains switched
off. If a change in altitude is recognized, Aladin® Pro Nitrox switches to -> surface­mode for 3 minutes.

Ready-mode:

Activation: By touching contacts B and E from sleep-mode.
To check the display, all signs light up for 5 seconds.

23

II

2. Dive Computer

depth dive time

O2 % MIX

max. depth deco info

24

After activation the Aladin® Pro Nitrox switches into ready-mode. Once in r eady­mode, the display is switched on, the set portion of oxygen and altitude sections
are eventually displayed.

By touching contacts B and E in the ready-mode once more, Aladin® Pro Nitrox
will display the remaining battery capacity by percentage. Three minutes after
activating the ready-mode, Aladin® Pro Nitrox will fall back into the -> sleep­mode.

II Aladin® Pro Nitrox - The System

2. Dive Computer

depth dive time

O2 % MIX

max. depth deco info

depth dive time

CNS O

LIMIT

2

O2 % MIX

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

%

DECOSTOP

ft

depth dive time

O2 % MIX

max. depth deco info

II Aladin® Pro Nitrox - The System

Dive-mode:

Activation: automatically at depth of about 2 ft.
In dive-mode, all diving functions are monitored, i.e. depth and dive time displayed,
maximum depth stored, saturation of tissues calculated, no-stop time or
decompression prognosis determined, ascent rate controlled and displayed and
the correctness of the decompression procedure supervised.
The portion of oxygen is displayed at the beginning of a dive until maximum
depth is reached, but in any case for 5 minutes.

Wait-mode:

Activation: automatically on reaching the surface
The wait-mode is activated if the the diver surfaces (diving depth less
than 2 ft). At the surface, the dive is not completed and entered into the
logbook for an interval of 5 minutes.
This allows the short surfacing for orientation or tank exchange. During
the 5 minutes waiting time, the portion of oxygen in alteration with
maximum depth is displayed.

25

II

2. Dive Computer

depth dive time

O2 % MIX

max. depth deco info

depth dive time

max. depth deco info

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

26

Surface-mode:

Activation: automatically after a dive or when changing altitude.
After a dive has been completed, Aladin® Pro Nitrox is in surface-mode. All data
belonging to the surface interval are calculated and displayed: simulation of
microbubble formation, actualization of oxygen toxicity and nitrogen saturation
of the tissues depending on the calculated skin temperature and the assumed
work load at the surface, calculation of desaturation time, and no fly interval.
Desaturation time is determined either by oxygen- or nitrogen saturation,
depending on the gas requiring the longer desaturation.
Oxygen saturation <CNS O2 LIMIT> is displayed an adjusted until the value becomes
0%.

In order to save energy, Aladin® Pro Nitrox falls into the “surface-sleep” after
3 minutes. The functions of surface-mode are then carried out in the background.
The atmospheric pressure is measured in surface-sleep once every minute. If the
atmospheric pressure decreases, for example in case of change of altitude, Aladin
Nitrox switches from sleep-mode or from surface-sleep into surface-mode auto­matically and displays the adaptation time. The adaptation time is the time after
which all body tissues have adapted to the ambient pressure (= desaturation time).

II Aladin® Pro Nitrox - The System

2. Dive Computer

depth dive time

O2 % MIX

DO NOT FLY

LOGBOOK

CNS O

LIMIT

2

S
L
O
W

h

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

II Aladin® Pro Nitrox - The System

Logbook-mode:

Activation: manually by contacts
Data of 19 past dives can be called up in the logbook-mode. It shows maximum
depth, dive time, preceding interval, altitude sections and possible alarms. A dive
is entered in the logbook if it has lasted more than 2 minutes. It also shows the
interval which has passed since the last dive or a preceding change of altitude.
Aladin® Pro Nitrox can be connected with an MS DOS personal computer with
an (optional) interface. The last 37 dives and the last dive-profiles can be read.
The number of profiles depends on the length of the dives (a total of 200 diving
minutes maximum).

O2-Mix-mode:

The O2-Mix-mode serves to select the percentage of oxygen in the nitrox gas­mixture.
The percentage of oxygen can be set from 21% to 50%.
Before every dive, make sure that the setting of the gas mixture corresponds to
the actual mixture used.

27

II

2. Dive Computer

depth dive time

O2 % MIX

S
L
O
W

DECOSTOP

DO NOT FLY

DIVEPLAN

CNS O

LIMIT

2

ft

max. depth deco info

depth dive time

O2 % MIX

S

L
O
W

DECOSTOP

DO NOT FLY

CNS O

LIMIT

2

ft

max. depth deco info

WARNING

28

Diveplan-mode: Activation: manually by contacts

The diveplan-mode serves the planning of a future dive. It allows the planning of
no-stop dives with determinable depth, dive time and composition of the gas
mixture. On repetitive dives, the surface interval can also be chosen. Calculations
are based on the temperature data of the last dive, assuming normal workload
and on the set gas mixture.
SOS-mode: Activation: automatically
If the diver remains above a depth of 4 feet for more than three minutes without
observing the prescribed decompression, the computer switches into SOS-mode
after the dive and displays <SOS> instead of the depth. The computer is locked
from use for the next 24 hours. Desaturation is further calculated including
microbubbles in the tissues. Diving is again possible after 24 hours, but the SOS­mode can influence the calculations of Aladin Nitrox for three days after the incident
due to the possible presence of microbubbles.

If a diver using Aladin® Pro Nitrox experiences a diving accident resulting in
decompression sickness, the dive can be analyzed by means of the PC-interface
and DataTrak-software.

Serious injury or death may result if a diver does not seek immediate treatment
at a recompression chamber should any signs or symptoms of decompression
sickness occur after a dive.

II Aladin® Pro Nitrox - The System

III DIVING WITH ALADIN® PRO NITROX

1. Terminology/Symbols 1.1 Display during no-stop phase ____________ 30

2. Attention Messages and Alarms 2.1 Attention messages ____________________ 34

3. Preparation for the Dive 3.1 Switching on _________________________ 40

4. Functions during the Dive 4.1 Dive time_____________________________ 42

5. Functions at the Surface 5.1 End of a dive _________________________ 51

6. Diving in Mountain Lakes _____________________________________ 55

III Diving with Aladin® Pro Nitrox

1.2 Display during decompression phase______ 31

1.3 Nitrox information _____________________ 32

2.2 Alarms_______________________________ 37

2.3 Alarm low battery _____________________ 39

3.2 Setting gas mixture ____________________ 41

4.2 Current depth ________________________ 42

4.3 Maximum depth ______________________ 43

4.4 Ascent rate ___________________________ 44

4.5 Partial pressure of oxygen_______________ 46

4.6 Oxygen toxicity________________________ 47

4.7 Decompression information _____________ 48

5.2 Desaturation time _____________________ 52

5.3 No fly time ___________________________ 53

5.4 Warning of bubbles____________________ 54

29

III

1. Terminology/Symbols

The information on the display of the Aladin® Pro Nitrox varies depending on the kind of dive and the dive
phase.

1.1 Display during no-stop phase
No-stop phase: Dive phase during which ascent is allowed without decompression stops.
Dive time: Time of the dive below depth of 4 ft.
CNS O2% Limit: Oxygen toxicity

depth dive time

A

D

CNS O

LIMIT

2

%

B

C

NO STOP

max. depth deco info

30

current depth

dive time

D

no-stop phase

A

B

no-stop time

decompression phase

C

24min

III Diving with Aladin® Pro Nitrox

1. Terminology/Symbols

WARNING

divers. Do not use the Aladin® Pro Nitrox for intentional decompression diving.

1.2 Display during decompression phase
Decompression depth: Lowest stage is displayed.
Decompression time: Prescribed duration of the decompression stop at the displayed decompression

stage.

Total ascent time to surface: Total ascent time including decompression stops.
CNS O2% Limit: Oxygen toxicity

Decompression diving should not be attempted by recreational or sport scuba

(7 min) total ascent time to surface

A

10 ft

depth dive time

CNS O

LIMIT

2

%

ft

DECOSTOP

max. depth

C

deco info

C

A

B

no-stop range

lowest decompre­ssion depth

B

2 min decompre­ssion time

decompression range

125 ft

III Diving with Aladin® Pro Nitrox

31

III

1. Terminology/Symbols

1.3 Nitrox information (O2 information)

For dives with compressed air in normal recreational diving nitrogen is the decisive gas for the decompr ession
calculations. When diving with nitrox, the toxicity of oxygen rises with the increase of the portion of oxygen
and increasing depth and can limit dive time. Aladin® Pro Nitrox includes this in the calculations and displays
the necessary information:

<O2 % MIX> Portion of oxygen: The portion of oxygen in the Nitrox mixture can be set between

21% (normal comressed air) and 50%.

ppO2 max Partial pressure of oxygen: The higher the portion of oxygen in the used mixture, the

smaller the dive depth at which the tolerable partial pressure of oxygen (ppO2 max) is
reached. Aladin® Pro Nitrox does not display the value, but warns the diver when he
reaches the tolerable maximum depth (standard 1.6 bar).

<CNS O2 LIMIT> Oxygen toxicity: With increasing portion of oxygen, the oxygen in the tissues, especially

in the central nervous system (CNS) becomes important for the decompression
calculations. If the partial pressure of oxygen rises above 0.5 bar, the tissues begin to
saturate with O2.

32

III Diving with Aladin® Pro Nitrox

1. Terminology/Symbols

WARNING

III Diving with Aladin® Pro Nitrox

Nitrox diving may only be attempted by experienced divers with special training.

ppO

O2 toxicity

CNS O

LIMIT

2

decreases

O2 toxicity increases

0.5 bar

%

ppO

2

2

III

max

33

2. Attention Messages and Alarms

depth dive time

max. depth deco info

CNS O

2

LIMIT

%

Aladin® Pro Nitrox draws the diver’s attention to certain situations and warns the diver of unsafe diving
practices. Attention messages and alarms are always optical and acoustic under water, only optical at the
surface except the decompression alarm.

The acoustic attention messages (but not the alarms) can be switched off (see
chapter VII Interface page 84).

2.1 Attention messages

Attention messages are communicated to the diver visually by symbols, letters or flashing figures. In addition,
two short acoustic sequences can be heard (in an interval of 4 seconds) in two different frequencies under
water. Attention messages come up in the following situations:

Dive in mountain lake

On a change of altitude,
the altitude section (0-3)
and adaptation time is
shown. See page 55.

34

depth dive time

DESATURATION

max. depth deco info

h

End of no-stop phase

In order to prevent a de­compression dive: ascend
a few feet.

III Diving with Aladin® Pro Nitrox

2. Attention Messages and Alarms

4 sec

depth dive time

S
L
O

W

O2 % MIX

NO STOP

max. depth deco info

4 sec

depth dive time

CNS O

LIMIT

2

S
L

%

O
W

O2 % MIX

NO STOP

max. depth deco info

III Diving with Aladin® Pro Nitrox

Partial pressure of oxygen reaches limit

The partial pressure of oxygen reaches the set value (setting not higher than 1.6 bar
by interface and DataTalk-software)

III

Oxygen toxicity

An oxygen toxicity of 75% is reached. Avoid a further increase of the value by
beginning the ascent.

35

2. Attention Messages and Alarms

depth dive time

O2 % MIX

S

L

O

W

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

max. depth deco info

36

Warning of bubbles

Extension of the surface interval is recommended. See pages 54 and 77.

h

III Diving with Aladin® Pro Nitrox

2. Attention Messages and Alarms

WARNING

Serious injury or death may result from failing to immediately respond to alarms
given by Aladin® Pro Nitrox.

2.2 Alarms

Alarms are given to the diver optically by flashing symbols, letters or figures and symbols. In addition, an

depth dive time

Excessive ascent rate.

S
L

%

O
W

SPEED

NO STOP

max. depth deco info

III Diving with Aladin® Pro Nitrox

WARNING

Reduce ascent rate.

37

III

2. Attention Messages and Alarms

depth dive time

CNS O

LIMIT

2

O2 % MIX

%

NO STOP

max. depth deco info

WARNING

38

Oxygen toxicity

The oxygen toxicity reaches 100%. Start ascent at once!

Oxygen toxicity reaching 100% can lead to dangerous neurological symptoms.

III Diving with Aladin® Pro Nitrox

2. Attention Messages and Alarms

depth dive time

CNS O

LIMIT

2

%

DECOSTOP

max. depth deco info

ft

2.3 Alarm low battery

depth dive time

NO STOP NO STOP

max. depth deco info

III Diving with Aladin® Pro Nitrox

depth dive time

max. depth deco info

WARNING

Ignoring decompression stop

Descend to the prescribed decompression
depth at once!

III

Computer battery low:

In dive-mode, <bAT> is indicated by a flashing display
and alternating with the display of maximum depth
as soon as battery capacity is 0%.
In ready-mode and surface-mode, <bAT> is shown
instead of maximum depth. Take the unit to your
authorized Uwatec Dealer!

39

3. Preparation for the Dive

3.1 Switching on

1. Switching on Aladin® Pro Nitrox manually:

Bridge contacts B and E with moistened fingers. Check test display: are all

depth dive time

O2 % MIX

S
L
O
W

DESATURATION

DECOSTOP

NO STOP

DO NOT FLY

DIVEPLAN
LOGBOOK

CNS O

SPEED

LIMIT

2

%

ft
h
m

max. depth deco info

h

displays lit?

depth dive time

O2 % MIX

max. depth deco info

40

2. The Aladin® Pro Nitrox is now in ready-mode.

It switches on automatically on being submerged in water and activates dive­mode, when a depth of more than 2 feet is reached. The depth indication may
be delayed for a few seconds.

In extremely pure freshwater, it is possible that the Aladin® Pro Nitrox will not
automatically activate into the dive-mode.

III Diving with Aladin® Pro Nitrox

3. Preparation for the Dive

3.2 Setting the gas mixture

Before every dive, you must check if the setting of the gas mixture (portion of
oxygen) on your Aladin® Pro Nitrox corresponds to the mixture in your tank. Reset
the mixture if necessary:

1 Switch on computer manually and check the portion of oxygen (O2 %MIX).

depth dive time

O2 % MIX

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

2 Switch to O2%MIX input stage by bridging B and -.
3 Confirm by bridging B and E.
4 Bridging B and + will increase the portion of oxygen (from 21% to 50%),

5 Confirm with B and E. Aladin® Pro Nitrox switches back into ready-mode.

bridging B and – decreases the portion of oxygen.

Before every dive, make sure that the setting of the

WARNING

gas mixture corresponds to the actual mixture used.
A wrong setting causes the Aladin® Pro Nitrox to
miscalculations for this particular dive. If the portion
of oxygen is set too low this can lead to an oxygen
intoxication without warning. If the value is set too
high decompression damages due to nitrogen
saturation may occur without a respective warning
from the Aladin® Pro Nitrox.

III

III Diving with Aladin® Pro Nitrox

41

4. Functions during the Dive

4.1 Dive time

The whole time spent below a depth of 4 feet is displayed as dive time in minutes. While the dive time is
running, the colon on the right of the figures is flashing in one second intervals. Maximum dive time displayed
is 199 minutes.

depth dive time

If a dive lasts longer than 199 minutes,
dive time starts again at 0 minutes,
because the display cannot show a larger

O2 % MIX

NO STOP

max. depth deco info

figure.

4.2 Current depth

Current depth is given in 1 foot-increments. On switching on and at a diving depth of less than 2 ft the void
display <—> appears.

depth dive time

O2 % MIX

NO STOP

max. depth deco info

42

depth dive time

CNS O

LIMIT

2

%

max. depth deco info

Depth measurement is based on fresh­water. Therefore, Aladin® Pro Nitrox
shows a slightly greater depth than
actually true when diving in salt water,
depending on the salinity of the water.

III Diving with Aladin® Pro Nitrox

4. Functions during the Dive

4.3 Maximum depth

Maximum depth is displayed if it is lower than the current depth (maximum indicator function). To prevent the
display changing very frequently when diving in the vicinity of maximum depth, it is only displayed if it exceeds
the current depth by more than three feet.

depth dive time

CNS O

LIMIT

2

%

NO STOP

max. depth deco info

III Diving with Aladin® Pro Nitrox

The portion of oxygen is displayed instead of maximum depth until a
first maximum depth is reached (but at least for 5 minutes).

43

III

4. Functions during the Dive

4.4 Ascent rate Optimal ascent rate varies depending on depth between 23 and 67 ft/min. It is
displayed in percent of the reference variable. If the ascent rate is greater than

depth dive time

S
L

%

O

W

SPEED

NO STOP

max. depth deco info

WARNING

44

100% of the set value, the black arrow <SLOW> appears. If the ascent rate exceeds
140%, the arrow starts flashing.
The Aladin® Pro Nitrox provides an acoustic alarm if the ascent rate is 110% or
greater of the set value. The intensity of the alarm increases in direct proportion
to the degree the prescribed ascent rate is exceeded.

The prescribed ascent rate must be observed at all times! Exceeding the prescribed
ascent rate can lead to microbubbles in the arterial circulation which can lead to
serious injury or death due to decompression sickness.

• The Aladin® Pro Nitrox may require a decompr ession stop even within the no-

stop phase because of the danger of the formation of microbubbles due to an
improper ascent.

• Decompression time necessary for the prevention of microbubbles can incr ease

massively if the ascent rate is exceeded.

• At great depth, too slow an ascent may cause heightened saturation of tissues

and an extension of both decompression time and total ascent time. At shallow
depth, a slow ascent may shorten decompression time because the tissues are
desaturating during a shallow, slow ascent.

• Display of the ascent rate has the priority to <CNS O2LIMIT>).

III Diving with Aladin® Pro Nitrox

4. Functions during the Dive

Messages:

Ascent rate Optical Acoustic alarm

SPEED

WARNING

alarm

S

%

L
O
W

III

III Diving with Aladin® Pro Nitrox

SPEED

SPEED

SPEED

%

%

%

S
L
O
W

S

L
O
W

S

L
O
W

Excessive ascent rates of longer periods are entered in the logbook.
Response: Reduce ascent rate

45

4. Functions during the Dive

4.5 Partial pressure of oxygen

The tolerable partial pressure of oxygen can be set by means of an interface cable and the DataTalk-software
between 1.2 and 1.95 bar (see page 84).
The set value or the information about the actual ppO2 are not displayed.

4 sec

depth dive time

O2 % MIX

DECOSTOP

NO STOP

max. depth deco info

Messages: Depending on the mixture used and the setting of the ppO2 the

limit for an attention message is reached at different depths. The
Aladin® Pro Nitrox sends an acoustic attention message when the
set partial pressure is reached; the indication of depth starts flashing.

Response: Go to a smaller depth in order to diminish the danger of oxygen

intoxication.

46

WARNING

The allowed maximum depth should not be exceeded or only for a short period.
Disregarding the warning can lead to oxygen intoxication.

III Diving with Aladin® Pro Nitrox

4. Functions during the Dive

4.6 Oxygen toxicity Oxygen toxicity is calculated from depth values and the gas mixture by the

depth dive time

CNS O

LIMIT

2

S
L

%

O
W

O2 % MIX

NO STOP

max. depth deco info

Messages: An acoustic signal is sent if oxygen toxicity reaches 75%. The symbol <CNS O

WARNING

calculation model and displayed in place of the ascent rate in percent of a maximum
value tolerated (O2 clock). The toxicity is expressed in 5%-increments. Together
with the percentage the symbol <CNS O2 LIMIT> is displayed.

LIMIT> and the percentage value are flashing.
Response: Value must no longer increase, go to smaller depth if necessary.

When oxygen toxicity reaches 100%, an acoustic alarm is sent every 4 seconds.
<CNS O2 LIMIT> and the precentage value are flashing.
Response: Start ascent at once.

- During an ascent warning and if the partial pressure of oxygen drops below

0.5 bar the acoustic warning is suppressed.

- During the ascent, the display of the oxygen toxicity extinguishes and the
ascent rate is displayed. If the ascent is stopped, the display changes back to
the indication of the saturation value.

III

2

III Diving with Aladin® Pro Nitrox

47

4. Functions during the Dive

4.7 Decompression information

No-stop time is displayed if no decompression stops are necessary. The arrow <NO STOP> is visible if no
decompression stops are necessary. The figures indicate no-stop time in minutes.

depth dive time

CNS O

LIMIT

2

O2 % MIX

DECOSTOP

NO STOP

max. depth deco info

depth dive time

CNS O

LIMIT

2

DECOSTOP

NO STOP

%

O2 % MIX

max. depth deco info

48

- No-stop display <99:> means remaining time of 99 minutes or
more.

- No-stop time is calculated on assuming normal workload and
current water temperature.

There is an acoustic alarm if no-stop time is less than

WARNING

1 minute. In this last minute, the no-stop display
shows the flashing value <0>.

Response: In order to prevent a decompression dive, you must ascend a few

feet after this message.

It is dangerous and an unsafe diving practice to

WARNING

"push" the Aladin® Pro Nitrox or any other
decompression tool to its limits. Avoid no-stop times
of less than three minutes at any given depth.

III Diving with Aladin® Pro Nitrox

4. Functions during the Dive

Decompression values On entering the decompression phase, the arrow <NO STOP> disappears. The

depth dive time

CNS O

LIMIT

2

DECOSTOP

DECOSTOP

%

ft

O2 % MIX

max. depth deco info

Messages:

WARNING

depth dive time

CNS O

LIMIT

2

DECOSTOP

%

ft

O2 % MIX

max. depth deco info

arrow <DECOSTOP> appears. Right beside the arrow , the deepest decompression
stage in feet is displayed. Beside the decompression depth, the decompression
time of the displayed stage in minutes appears. The display <10ft 5:> means that
a decompression stop of 5 minutes at a depth of 10 ft has to be made.
When a decompression stop has been finished, the next higher decompression
stop is displayed. When all decompression stops have been made, the arrow
<DECOSTOP> extinguishes and the arrow <NO STOP> reappears. The indication
of time on the lower right shows the no-stop time again.

The decompression alarm is activated if the decompression stop is ignored.
Arrow <DECOSTOP> begins flashing and an acoustic alarm is initiated. 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 <DECOSTOP> continues 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.
If the total (cumulative) duration of the decompression alarm is longer than a
minute, it is entered in the logbook.

Response: Descend to the prescribed decompression depth immediately!

III

III Diving with Aladin® Pro Nitrox

49

4. Functions during the Dive

T otal time of ascent As soon as decompression stops are necessary, Aladin® Pro Nitrox shows the total

time of ascent. The time of ascent to the first decompression stage and all

depth dive time

CNS O

LIMIT

2

DECOSTOP

%

ft

O2 % MIX

max. depth deco info

decompression stops are included.

The 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%).

50

III Diving with Aladin® Pro Nitrox

5. Functions at the Surface

5.1 End of a dive

depth dive time

max. depth deco info

depth dive time

O2 % MIX

O2 % MIX

max. depth deco info

In surface-mode, Aladin® Pro Nitrox shows desaturation time, no fly time and <CNS O2LIMIT>).

WARNING

After reaching the surface, Aladin® Pro Nitrox switches into wait-mode
automatically for five minutes. This is the time span necessary to recognize
the end of the dive.
The delay allows the surfacing for a short period for orientation or for a
change of the tank.
During the five minutes' waiting time, the portion of oxygen is displayed

alternatingly with maximum depth.
When the dive is closed after 5 minutes in wait-mode, it is entered into the logbook
and Aladin® Pro Nitrox switches into surface-mode.

If the tank is changed in this phase, you must make sure that the mixture is
exactly the same as the one previously used. If you want to dive with another
mixture, you must wait at the surface for 5 minutes to allow the Aladin® Pro
Nitrox to close the dive. Now, the setting of the mixtur e must be adjusted to the
new mixture. Disregarding this rule causes the Aladin® Pro Nitrox to calculate
with wrong mixture data. This can lead to injury or death.

III

III Diving with Aladin® Pro Nitrox

51

5. Functions at the Surface

5.2 Desaturation time

depth dive time

O2 % MIX

max. depth deco info

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

When <DESATURATION> appears, the Aladin® Pro Nitrox is in surface-mode.
Desaturation time in hours and minutes, the set mixture (portion of oxygen) and,

h

if available, oxygen toxicity is displayed next to that. Desaturation time is continually
indicated until the next dive or until it reaches zero. The display is switched off to
save energy three minutes after the last manipulation is made (surface-sleep­mode).

In some cases, desaturation times with the Aladin® Pro Nitrox are considerably
longer than those of its predecessors. This is because the calculation model assumes
reduced physical activity at the surface (therefore less nitrogen off gassing) and
uses shorter half-times.

If desaturation time reaches zero, the “tissue“ models of the Aladin® Pro Nitrox
are desaturated and it switches into the sleep-mode.

Desaturation time is determined either by oxygen or nitrogen saturation, depending
on which gas requires the longer desaturation time.
Oxygen saturation (<CNS O2LIMIT>) is displayed and adjusted until the value
becomes 0%.

52

III Diving with Aladin® Pro Nitrox

5. Functions at the Surface

5.3 No fly time

depth dive time

O2 % MIX

max. depth deco info

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

The waiting period until the next flight is indicated as follows:<DO NOT FLY>.
Beside this indicator is the time in hours that should pass before a flight.

h

Next to that display the time in hours until it is considered appropriate to fly is
displayed (because of recalibrated desaturation time).

III

WARNING

III Diving with Aladin® Pro Nitrox

Flying while theAladin® Pro Nitrox displays “DO NOT FLY“ may lead to serious
injury or death from decompression sickness.

53

5. Functions at the Surface

5.4 Warning of bubbles

depth dive time

O2 % MIX

max. depth deco info

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

Through repetitive dives microbubbles may accumulate in the lungs if the surface
interval is not long enough. Ignoring decompression stops or an excessive ascent

h

rate can also lead to bubbles in tissues. In order to reduce the risk of decompression
sickness for future repetitive dives, the surface interval should be planned long
enough to reduce the risk of decompression sickness. If Aladin® Pro Nitrox calculates
that the formation of microbubbles may occur during the surface interval, it will
advise a diver to extend the surface interval. If the display <Atn> (=attention) is
visible instead of the depth during the surface interval (surface-mode), the diver
should not undertake another dive. Through the extension of the interval the
diver may prevent a high concentration of bubbles in the lungs during the planned
dive and avoid a higher risk situation.

– If the dive has to be made during <Atn>-time, the <Atn> time of the following

– If the dive is made in spite of the display <Atn>, the diver must cope with

dive can increase considerably.

aclearly shorter no-stop time and an extension of decompression.

54

III Diving with Aladin® Pro Nitrox

6. Diving in Mountain Lakes

depth dive time

Aladin® Pro Nitrox measures the atmospheric pressur e even while in sleep-mode.
If the computer detects a higher altitude, it switches into surface-mode
automatically. Desaturation time indicated at this moment refers to adaptation

DESATURATION

max. depth deco info

h

time at this altitude. If diving starts within this adaptation time, Aladin® Pro Nitrox
treats it as a repetitive dive, since the body still has a higher saturation.

The entire altitude range is divided into four sections which are influenced by barometric pr essure. That is why
the defined altitude sections overlap on their fringes. The altitude section is indicated at the surface, in the
logbook and in the dive planner by stylized mountains, if a mountain lake altitude is reached. Sea level to an
altitude of approximately 3000 ft is not indicated. In the following, you can see the approximate altitude
ranges of the four sections:

13120 ft

9840 ft

6560 ft

3280 ft

0 ft

III Diving with Aladin® Pro Nitrox

switching at
approx. 8.85 psi

switching at
approx. 10.51 psi

switching at
approx. 11.81 psi

switching at
approx. 13.12 psi

55

III

6. Diving in Mountain Lakes

In order to assure optimal decompression even at higher altitudes, the 10 ft decompression stage is divided into
a 13 ft stage and a 7 ft stage (the pescribed decompression depths are, in sequence, 7 ft, 13 ft, 20 ft, 30ft).

depth dive time

max. depth deco info

WARNING

Aladin® Pro Nitrox can be used as decompression computer in case of an emergency
up to an altitude of 13123 ft. If atmospheric pressure is below 8.99 psi (altitude
higher than 13123 ft above sea level), no decompression information is displayed.
Dive-plan-mode can no longer be started, since no decompression information is
available. Beside the display of the altitude section 3, <HI> (=high) appears, telling
the diver that he will not get any decompression information for the dive. Oxy­gen-toxicity is further calculated. Even very small differences in the pressure
receptors can cause an indication of different altitude sections of two dive
computers at the same altitude on the fringes of the altitude ranges. These
differences are not meaningful and do not interfere with the functions of Aladin
Pro Nitrox. But if an altitude section is displayed at sea level or the altitude read
outs of two computers differ by more than one altitude section (e.g. section 2
instead of 0), there may be a defect of the computer. In this case, send your
computer back to your retailer for testing.

Diving while at altitude can considerably increase the risk of decompression
sickness. Do not undertake high altitude diving without being specifically trained
in the special techniques of such diving.

®

56

III Diving with Aladin® Pro Nitrox

IV DIVING AT REDUCED RISK WITH ALADIN® PRO NITROX

1. Diving at Reduced Risk with Aladin® Pro Nitrox

1.1 Diving at r educed risk __________________ 58

1.2 Minimizing risk on r epetitive dives ________ 60

1.3 Response in incr eased risk situations ______ 61

IV

IV Diving at Reduced Risk with Aladin® Pro Nitrox

57

1. Diving at Reduced Risk with Aladin® Pro Nitrox

1.1 Diving at reduced risk

Analyzing the most r ecent r esults of decompr ession r esear ch and statistical analysis of diving accidents involving
decompr ession sickness allows for the cr eation of guidelines for diving at r educed risk for decompr ession
sickness. Aladin® Pro Nitr ox r ecognizes and r eacts “intelligently“ to cer tain risk situations. Of course, it is much
better that each individual diver avoid these higher risk situations altogether . Yet if a decompr ession accident
does occur , the optional PC-inter face allows the analysis of the dive pr ofile and cer tain risk parameters to
provide for mor e complete infor mation for tr eatment purposes. The following ar e highly r ecommended
suggestions for r educing the risk of decompr ession sickness.

Neither the Aladin® Pro Nitr ox nor any other diving computer or decompression

WARNING

• Check <O2% MIX> (gas mixtur e) and the dive limit given by the ppO2 max. of 1.6 bar befor e ever y dive.

• In accor dance with the r ecommended maximum diving limit, do not dive deeper than 130 feet.

• Do not use the Aladin® Pro Nitr ox for planned decompr ession diving. The decompr ession alogrithm contained
in the Aladin® Pro Nitr ox should be used only for emer gency or unintended decompr ession.

• Observe <CNS O2 LIMIT> (ascent at 75%).

• On all dives with the Aladin® Pro Nitr ox, make a safety stop for thr ee to five minutes within the ten to thir ty
feet zone.

58

table can guarantee that decompression sickness will not occur even if the computer
or table is used correctly and all of the following precautions are followed.

IV Diving at Reduced Risk with Aladin® Pro Nitrox

1. Diving at Reduced Risk with Aladin

• Never use the Aladin® Pro Nitr ox for r epetitive, “squar e“ dives deeper than 60 feet. A squar e dive is
performed for its duration at a uniform depth.

• Always make the deepest dive of the day first when r epetitive dives ar e planned, and for each successive
dive make sur e that the deepest por tion of that dive is done at the beginning of the dive.

• All divers using dive computers to plan dives and indicate or deter mine decompr ession status must use
their own diving computer .

• On any given dive, both divers in a buddy pair must follow the most conservative dive computer for that
particular dive.

• If the Aladin® Pro Nitr ox fails at any time during the dive, the dive must be ter minated, and appr opriate
surfacing pr ocedur es should be initiated immediately .

• You should not dive for a period of twenty-four hours befor e activating the Aladin® Pro Nitr ox to use it to
plan or contr ol your diving.

®

Pro Nitr ox

IV

• You MUST follow the ascent rates as indicated by the Aladin
for any r eason, you must ascend at a rate of no gr eater than 60 feet per minute.

IV Diving at Reduced Risk with Aladin® Pro Nitrox

®

Pro Nitr ox and if the computer should fail

59

1. Diving at Reduced Risk with Aladin

®

Pro Nitr ox

• You MUST be familiar with all signs and symptoms of decompr ession sickness befor e using the Aladin
Air X Nitr ox! Seek IMMEDIA TE tr eatment for decompr ession sickness should any of these signs or symptoms
occur after a dive! Ther e is a dir ect cor relation between the ef ficacy of tr eatment and the delay between
the onset of symptoms and the tr eatment for decompr ession sickness.

• Always obser ve the visual and acoustic alar m signals of the Aladin® Pro Nitr ox. A void situations of incr eased
risk which ar e marked with a war ning sign in this operating manual.

• Never dive the Aladin® Pro Nitr ox to the limit. Neither the Aladin® Pro Nitr ox nor any other diving computer
or decompr ession table should be pushed to its limit. Give yourself a mar gin of safety by always leaving at
least a few minutes in the “no-stop“ box befor e making your ascent.

• Avoid r epeated ascents and descents (yo-yo diving) while using the Aladin

1.2 Minimizing risk on repetitive dives

With consecutive r epetitive dives, ther e will be excess nitr ogen in the body due to the accumulation of nitr ogen
on the pr eceding dive. Depending on the length of the sur face inter val, ther e could even be gaseous nitr ogen
(microbubbles) in your body . This accumulation of both soluble as well as potentially gaseous nitr ogen in the
body can gr eatly incr ease the risk of decompr ession sickness on subsequent dives. That risk can be minimized.

• Wait until <CNS O2 LIMIT> is less then 30%

• Match gas mixtur e to the intended dive.

60

IV Diving at Reduced Risk with Aladin® Pro Nitrox

®

Pro Nitr ox.

®

1. Diving at Reduced Risk with Aladin

• Always make your first dive the deepest dive of the day .

• Always make the deepest descent of each given dive on a particular day at the beginning of that dive.

• Never make “squar e“ dive pr ofiles of 60 feet or gr eater as r epetitive dives.

• Avoid yo-yo diving during r epetitive dives.

®

Pro Nitr ox

• Plan for a minimum sur face inter val of thr ee to four hours.

• Do not attempt to r epetitive dive if the <Atn> is visible on the display .

• Take a day of f from diving ever y thr ee or four days.

1.3 Response in increased risk situations

If the dive includes an incr eased risk situation, Aladin® Pro Nitr ox reacts automatically to war n the diver of this
risk and to decr ease RBT or incr ease r equir ed decompr ession, as the case may be. A change of decompr ession
may be indicated to minimize the risk. The diver can fur ther r educe the risk thr ough his conser vative diving
practices on the next dive and at the same time pr event long decompr ession stops.
A few examples on the following pages:

IV Diving at Reduced Risk with Aladin® Pro Nitrox

61

IV

1. Diving at Reduced Risk with Aladin

Situation: The diver ascends too rapidly:

Reaction of computer: The model calculates the formation of bubbles due to the excessively rapid ascent.

No-stop time is shor tened or a longer (and eventually at gr eater depth)
decompr ession pr escription is displayed in or der to assur e incr eased decompr ession.

Recommended response of the diver

During the dive: – Obser ve the new decompr ession pr escription shown by Aladin® Pro Nitr ox.

After the dive: – Watch for symptoms of ar terial gas embolism and decompr ession sickness.

– Seek immediate medical attention at a r ecompr ession chamber should any

signs or symptoms of decompr ession sickness appear .

– Befor e the next dive, plan a suf ficiently long inter val (display <Atn> should

have disappear ed).

®

Pro Nitr ox

62

WARNING

WARNING

An exessive ascent rate can lead to serious injur y or death fr om decompr ession
sickness.

Failur e to seek IMMEDIA TE treatment for any signs or symptoms of decompr ession
sickness after a dive may r esult in serious injur y or death.

IV Diving at Reduced Risk with Aladin® Pro Nitrox

1. Diving at Reduced Risk with Aladin

Situation: The diver disregards the prescribed decompression depth.

Reaction of computer: The model calculates the for mation of bubbles due to ignoring decompr ession. A

longer (and eventually at gr eater depth) decompr ession is displayed in or der to
assur e suf ficient time for desaturation.

Recommended response of the diver

During the dive: – Descend to the pr escribed decompr ession depth at once.

– Do not descend to gr eater depths during the dive.
– Obser ve the decompr ession pr escribed by Aladin® Pro Nitr ox.

After the dive: – Watch out for symptoms of ar terial gas embolism and decompr ession sickness.

– Befor e the next dive, plan a suf ficiently long inter val (display <Atn> should

have disappear ed).

®

Pro Nitr ox

IV

WARNING

WARNING

IV Diving at Reduced Risk with Aladin® Pro Nitrox

Failur e to comply with all decompr ession infor mation on the Aladin® Pro Nitr ox
may r esult in serious injur y or death due to decompr ession sickness.

Ther e is a risk of decompr ession sickness on ever y dive even if all pr ecautions
described in this manual ar e taken.

63

1. Diving at Reduced Risk with Aladin

Situation: It is very unlikely to have a surface interval long enough to clear the <Atn> prior

to the next dive during an organized dive trip from a boat. This previous buildup
of nitrogen must be taken into consideration for the next dive.

Reaction of computer: Aladin Nitr ox calculates a shor ter no-stop time or decompr ession pr escription to

reduce the risk of decompr ession sickness.

Recommended response of the diver

During the dive: Dive conser vatively on all r epetitive dives. Limit your maximum depth to no mor e

than 75 feet at the very beginning of the dive, do not allow the RBT to go below
three minutes, and make a ver y slow ascent.

After the dive: Befor e the next dive, plan a suf ficiently long sur face inter val (<Atn> display should

disappear).

®

Pro Nitr ox

64

IV Diving at Reduced Risk with Aladin® Pro Nitrox

1. Diving at Reduced Risk with Aladin

Situation: <CNS O2 LIMIT> r eaches 100%

Reaction of computer: An acoustic and visual war ning is given.

Recommended response of the diver

- Ascend immediately until ppO2 is less then 0.5 bar and the buzzer stops

Situation: ppO2 reaches the set value.

Reaction of computer: Depth indication is flashing (attention message)

Recommended response of the diver

– Ascend above critical depth limit
– Obser ve <CNS O2 LIMIT> car efully

®

Pro Nitr ox

IV

IV Diving at Reduced Risk with Aladin® Pro Nitrox

65

66

IV Diving at Reduced Risk with Aladin® Pro Nitrox

V LOGBOOK

1. Survey _____________________________________ 68

2. Selection and Activation _____________________________________ 69

3. Selection of Dive _____________________________________ 70

4. Leaving the Logbook-Mode _____________________________________ 71

5. Output on PC _____________________________________ 72

V

V Logbook

67

1. Survey

Aladin® Pro Nitrox features a logbook with the last 19 dives. A dive is only entered in the logbook if dive time
is longer than 2 minutes. Displayed information of the dive:

– alarms during the dive

– altitude sections if any

– maximum depth

68

depth dive time

– dive time

LOGBOOK

S
L
O

O2 % MIX

W

DECOSTOP

h

max. depth deco info

– dive number

– duration of surface inter-

val (only with repetitive
dives)

If a dive is started within adaptation time (after a change of altitude), the adaptation
time is displayed instead of the surface interval.

V Logbook

2. Selection and Activation

depth dive time

DO NOT FLY

O2 % MIX O2 % MIX

max. depth deco info

depth dive time

max. depth deco info

Ready-mode Surface-mode

depth dive time

DO NOT FLY

LOGBOOK

max. depth deco info

V Logbook

depth dive time

max. depth deco info

DESATURATION

DO NOT FLY

CNS O

DO NOT FLY

LOGBOOK

1. The logbook is selected by bridging contacts B

h

LIMIT

2

%

h

and + in ready- or surface-mode. Indication
<LOGBOOK> appears. If Aladin® Pro Nitrox has
been in surface-mode before, the surface interval
appears as well. Y ou go back into ready- or surface­mode by B and –.

2. In order to activate the logbook, bridge contacts B
and E. The most recent dive is displayed (DIVE I).

V

depth dive time

LOGBOOK

CNS O

2

h

h

LIMIT

max. depth deco info

69

3. Selection of Dive

depth dive time

DO NOT FLY

LOGBOOK

max. depth deco info

depth dive time

DO NOT FLY

LOGBOOK

max. depth deco info

depth dive time

DO NOT FLY

LOGBOOK

max. depth deco info

70

1. Bridge contacts B and + to get the information of the dive preceding the most

recent one. Display <DIVE 2> appears.

2. On additional bridging of B and + the logbook jumps to the next older dive
(DIVE 3).

3. On constant bridging of the contacts all dives are displayed successively.

4. Bridging contacts B and – allows switching back from older dives to more

recent ones.

depth dive time

max. depth deco info

DO NOT FLY

LOGBOOK

V Logbook

4. Leaving the Logbook-Mode

depth dive time

DO NOT FLY

max. depth deco info

or after 3 minutes

depth dive time

max. depth deco info

V Logbook

DO NOT FLY

O2 % MIX O2 % MIX

depth dive time

DESATURATION

DO NOT FLY

CNS O

LIMIT

2

%

h

max. depth deco info

Touch contacts B and E.
Aladin® Pro Nitrox switches back into ready- or surface­mode. This also happens 3 minutes after activating
logbook-mode.

V

h

71

5. Output on PC

With the optional DataTrak interface and softwar e information on the last 37 dives can be r ead out. The dive
profiles of the last dives, up to a total of 200 minutes, can be represented.

Time and date of the dive are entered automatically, based on the clock of the PC-system when the data are
transferred via interface.

The possibilities and the
procedure of this data
transfer are described in
a separate manual.

depth

dive time

DIVE

max. depth

deco info

®

72

V Logbook

VI DIVE PLANNER

1. Survey _____________________________________ 74

2. Selection and Activation from Ready-Mode _____________________________________ 75

3. Selection and Activation from Surface-Mode _____________________________________ 76

4. Planning a No-Stop Dive _____________________________________ 77

5. Planning a Decompression Dive _____________________________________ 79

6. Planning a Nitrox-dive 6.1 Calculation of maximum depth _______ 80

6.2 Calculation of mixture for a given depth 80

7. Leaving the Diveplan-Mode _____________________________________ 81

VI

VI Dive Planner

73

1. Survey

The Aladin

®

Pro Nitrox is equipped with a dive planner which allows the planning of no-stop dives with freely

determinable surface interval for the portion of oxygen set at the moment. The water temperature of the most
recent dive and eventual altitude sections < > are incorporated in the calculation.

depth dive time

O2 % MIX

max. depth deco info

Planning of Nitrox- dives

depth dive time

DIVEPLAN

h

max. depth deco info

interval (only during

depth dive time

DIVEPLAN

DECOSTOP

NO STOP

max. depth deco info

Planning of no-stop divesPresetting the surface

depth dive time

DIVEPLAN

DECOSTOP

max. depth deco info

ft

Planning of decompres­sion dives

desaturation)
If you do not alter the setting of the gas mixture (portion of oxygen) the planning

bases on the already set mixture

WARNING

Planned decompression dives violate the responsible diving practice standards
of every major diving organization. They are not to be attempted by recreational
or sport scuba divers. Only professional divers with extensive experience, training
and the appropriate equipment for decompression diving (including the presence
of an on board recompression chamber) should attempt to plan a decompression
dive!

74

VI Dive Planner

2. Selection and Activation from Ready-Mode

depth dive time

max. depth deco info

2x

depth dive time

DIVEPLAN

max. depth deco info

depth dive time

max. depth deco info

VI Dive Planner

NO STOP

DO NOT FLY

DIVEPLAN

1. From ready-mode, you switch into the diveplan input stage by twice bridging
contacts B and –.

2x

2. The display shows <DIVEPLAN>.
You return to ready-mode by B and + twice.

3. Contacts B and E afterwards activate the planning mode.

4. The display shows no-stop times for increasing depths (scrolling no-stop times,

see page 77, planning of a no-stop dive).

VI

75

3. Selection and Activation from Surface-Mode

depth dive time

O2 % MIX

DESATURATION

max. depth deco info

h

2x

depth dive time

DIVEPLAN

max. depth

max. depth deco info

depth dive time

DIVEPLAN

h

max. depth deco info

deco info

76

1. From surface-mode, you switch into the diveplan input stage by twice bridging

B and –.

2. The display shows <DIVEPLAN>.
You return to surface mode by B and +.

2x

3. After confirming by B and E, the display shows <Add>, <Int> and the interval
(flashing). Aladin

®

Pro Nitrox expects your input for the duration of the dive

interval.

4a.If no surface interval is to be

entered, (diving at the present
moment), confirm this with con-

4b. You can extend the interval

with contacts B and +.

B and - shorten the interval.
tacts B and E, and you switch into
no-stop planning (page 77).

5. You confirm the new surfa­ce interval and get into no­stop planning (page 77).

VI Dive Planner

4. Planning a No-Stop Dive

depth dive time

DECOSTOP

NO STOP

max. depth deco info

depth dive time

max. depth deco info

DECOSTOP

NO STOP

DO NOT FLY

DIVEPLAN

VI Dive Planner

After confirming the surface interval (if possible), no-stop times are displayed in
10-ft-increments. The process starts with 30ft. The no-stop time for every 10-ft­increment is displayed for about 3 seconds (scrolling no-stop times).

No-stop times are displayed to the depth at which the partial pressure of oxygen
(ppO2) has not yet reached the set maximum value.

Repetitive dives usually cause more microbubbles in the lungs than on first dives
if the surface interval is not long enough. T oo rapid an ascent and/or disr egarding
decompression instructions can lead to microbubbles. By calculating the formation
of bubbles, Aladin

®

Pro Nitrox is able to advise the diver to extend the surface

interval if necessary. If <Atn> is displayed instead of the depth in addition to the
no-stop times, the diver should plan an extension of the interval if possible.

– By repeatedly recalling of the diveplan with varying surface intervals the

minimum interval can be determined.

77

VI

4. Planning a No-Stop Dive

- Diving with the display <Atn>, a clear shortening of the no-stop time and/or

WARNING

- If a dive is made during <Atn>-time, the <Atn>-time following the dive can

an extension of decompression has to be expected.

increase considerably.

78

WARNING

Making a repetitive dive when <Atn> is displayed will increased your risk of
serious injury or death from decompression sickness!

VI Dive Planner

5. Planning a Decompression Dive

depth dive time

DIVEPLAN

NO STOP

max. depth deco info

depth dive time

DIVEPLAN

DECOSTOP

max. depth deco info

depth dive time

DECOSTOP

max. depth deco info

VI Dive Planner

ft

DIVEPLAN

ft

Planned decompression dives violate the responsible

WARNING

diving practice standards of every major diving

organization. They are not to be attempted by
recreational or sport scuba divers. Only professional divers with extensive
experience, training and the appropriate equipment for decompression diving
(including the presence of an on board recompression chamber) should attempt
to plan a decompression dive!

1. In order to plan a dive that requires decompression, wait until the scrolling no­stop time shows the desired depth.

2. By means of contacts B and E you can switch into decompression planning.
Dive time is now one minute longer than no-stop time, and the decompression
information appears.

3. <Add> demands that you set the time. This is done with contacts B and +, B
and – respectively . As soon as the contacts ar e no longer bridged, Aladin

®

Pro

Nitrox calculates the decompression information for this set time. This
calculation takes some time.

If you wish to plan a dive requiring decompression at another depth,
switch from decompression planning to no-stop planning by means of

B and E. Aladin

®

Pro Nitrox again shows the scrolling no-stop times. Now you can

switch between no-stop planning and decompression planning at will with contacts
B and E.

79

VI

6. Planning a Nitrox-dive

The dive-planner of the Aladin

®

Pro Nitrox always plans dives under the consideration of the set portion of

oxygen. This can be used to – calculate maximum depth to be reached with the given mixture

– calculate the necessary mixture for a dive with a given depth

depth dive time

O2 % MIX

max. depth deco info

depth dive time

S
L
O
W

NO STOP

DO NOT FLY

DIVEPLAN

max. depth deco info

6.1 Calculation of maximum depth

1. Set the desired portion of oxygen. (see page 41)

2. Activate the dive planner as described above.

3. Observe the depth indications and memorize the
greatest depth displayed. This is also maximum
depth for a dive with the set mixture under
consideration of the set maximum partial pressure
of oxygen.

depth dive time

S
L
O
W

NO STOP

DO NOT FLY

DIVEPLAN

max. depth deco info

depth dive time

O2 % MIX

max. depth deco info

6.2 Calculation of the mixture for a given depth

1. Activate the dive-planner and observe the
maximum depth displayed.

2. If the desired depth is reached or exceeded, leave
the dive-planner , alter the portion of oxygen and
return to the scrolling no-stop times. Repeat this
procedure until the desired depth occurs as
maximum depth.

3. In ready-mode, the ideal portion of oxygen for
this depth is indicated.

80

VI Dive Planner

7. Leaving the Diveplan-Mode

depth dive time

DIVEPLAN

DECOSTOP

max. depth deco info

ft

3 s

or after 3 minutes

depth dive time

O2 % MIX

max. depth deco info

WARNING

VI Dive Planner

If the contacts B and E are touched for about 3 seconds, Aladin

®

Pro Nitrox falls

back into ready- or surface-mode. This also occurs three minutes after the activation
of the diveplan-mode.

On a short touch of contacts B and E the Aladin

®

Pro Nitrox switches

back to the scrolling no-stop times.
In order to completely leave the diveplan-mode, B and E must be
continually bridged until two acoustic bleeps have occured.

If two or more divers using computers are planning a dive, planning for all divers
has to be based on the dive computer showing the shortest no-stop times.
Failure to do this may lead to serious injury or death from decompression sickness.

81

VI

82

VI Dive Planner

VII INTERFACE

1. Interface 1.1 Personal programming of the dive computer __ 84

1.2 Analysis and storage of real dives ____________ 85

VII

VII Interface

83

1. Interface

The Aladin® Pro Nitrox is able to communicate with a personal computer. The connection is established by
contact sensors. A special interface cable and the necessary PC-software DataT rak/DataT alk (MS-DOS) is available
on the market. Communication via interface has a number of advantages:

1.1 Personal programming of the dive computer

Several parameters can be set individually by the user, e.g.:
– The partial pressure of oxygen can be adjustet between 1.2 and 1.95 bar.
– The physical units of water depth and tank pressure can be selected (metric/imperial).
– The attention message acoustic alarm can be switched off if desired (see pgs. 34-36). The actual alarms

shown on the face of the Aladin® Pro Nitrox are not affected by the acoustic alarm being switched off.
These actual alarms include not having enough gas mixture for a safe ascent, ignoring decompression
stops, or making too rapid an ascent.

84

VII Interface

1. Interface

ppO2 max must not be set higher than 1.6 bar

WARNING

If you switch off the acoustic alarm of the Aladin Nitrox you must pay careful

WARNING

1.2 Analysis and storage of real dives

The last approx. 200 minutes of dive time are stored by the dive computer in increments of 20 seconds and can
be transferred to the PC. The DataT rak software allows the r epresentation and analysis of the profiles. Thereby,
all relevant data are examined and displayed for every point in time. The DataTrak releases 1.6 and higher
recognize the Aladin® Pro Nitrox and display the respective data.
The PC program enables the diver to keep a personal logbook. Apart from the 200 minutes of diving, 37 dives
are registered in the form of the logbook function of Aladin® Pro Nitrox. If the data from Aladin® Pro Nitrox are
transferred periodically , all dives are stor ed in the PC as profiles or in this short form. Time and date of the dives
are automatically registered on the data transfer and the dives can be printed out on a page for the diver’s
logbook.

attention to the visual alarms on the face of the Aladin Nitrox. Failure to follow
all alarms whether audible or not may lead to serious injury or death due to
decompression sickness, and/or drowning.

VII

VII Interface

85

86

VII Interface

VIII TROUBLE SHOOTING

1. Trouble Shooting _____________________________________ 88

symptom possible reason(s) response

VIII

VIII Trouble Shooting

87

1. Trouble Shooting

symptom possible reason(s) response

Altitude section does not
correspond to the current
altitude.

Atmospheric pressure is especially high
or low.
Gas mixture pressure measured by the
computer is wrong.

Check barometric information.

Send in dive computer for servicing
(only if altitude section is wrong by
than one section, see chapter III 6).
view chapter III 5 very carefully.

more

Re-

Desaturation time and/or
no fly time are very long.

<Atn> appears in place of
the diving depth on the
display.

88

Slow tissue and/or little workload at the
surface.
T oo many repetitive dives, yo-yo-diving,
square profile repetitive dives or disre-

garding decompression stops. Dissolved
nitrogen and/or microbubbles must be
off gassed first.

T oo many repetitive dives, yo-yo-diving,
square profile repetitive dives or disre­garding decompression stops. Dissolved
nitrogen and/or microbubbles must be
off gassed first.

Plan sufficiently long surface interval
and dives at lower risk.

Plan sufficiently long surface interval
and dives at lower risk. Review chapters
III 5 and IV very carefully.

VIII Trouble Shooting

1. Trouble Shooting

symptom possible reason(s) response

.An unexpected decom­pression stop appears in
place of no-stoptime or
decompression increases
in leaps.

T oo rapid an ascent or ignoring decom­pression stops have caused a
largenumber of microbubbles, which
leads to an attention message (warning
of bubbles).

Plan sufficiently long surface interval
and dives at lower risk. Review chapters
III 5 and IV very carefully.

Attention messages are
not given acoustically.

VIII Trouble Shooting

The acoustic signal of the attention
messages is switched off.

Reactivate attention messages by
means of the interface.

VIII

89

symptom possible reason(s) response

90

VIII Trouble Shooting

IX APPENDIX

1. Maintenance of Aladin® Pro Nitrox Dive Computer

_____________________________________ 92

2. Technical Information _____________________________________ 94

3. Warranty 3.1 Recognition of warranty ________________ 95

3.2 Scope of the warranty__________________ 95

3.3 Warranty period and claim ______________ 96

IX

IX Appendix

91