®
Aladin Square
User manual
SQUARE DIVING COMPUTER - DESIGNED BY DIVING ENGINEERS
Welcome to SCUBAPRO dive computers and thank you for purchasing Square. You are
now the owner of an extraordinary partner for your dives. This manual provides you easy
access to SCUBAPRO state of the art technology and Square’s key features and functions.
Should you wish to know more about SCUBAPRO diving equipment, please visit our website
www.scubapro.com.
WARNING
• Square has 120m/394ft operation depth.
• If 120m is exceeded, -- will be shown in the depth field and decompression algorithm does not
calculate correctly.
• Diving with oxygen partial pressures higher than 1.6 bar (corresponding to a depth of 67m/220ft
when breathing compressed air) is extremely dangerous and could lead to serious injury or death.
Aladin Square 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.
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ALADIN SQUARE USER MANUAL
1.
English
TABLE OF CONTENTS
Introduction to Square ......................................................................................... 6
1.0.1 Buttons .................................................................................... 6
1.0.2 Display ..................................................................................... 7
1.0.3 Heart Rate Option .................................................................... 7
1.0.4 Battery ..................................................................................... 7
1.0.5 Square operation ..................................................................... 8
1.0.6 Surface display ........................................................................ 8
1.0.7 Surface interval counter ............................................................ 8
1.0.8 Checking the Altitude ............................................................... 9
1.0.9 Planning a dive ......................................................................... 9
1.0.10 Reading the Logbook ............................................................. 10
1.0.11 SCUBA log’s .......................................................................... 11
1.0.12 Apnea log’s ............................................................................ 12
1.0.13 Gauge log’s ............................................................................ 12
1.0.14 Checking the battery status ................................................... 13
1.0.15 Settings ................................................................................. 13
1.0.16 Settings Lock ......................................................................... 14
1.0.17 Time set menu ....................................................................... 15
1.0.18 Setting the alarm clock ........................................................... 15
1.0.19 Setting the UTC .......................................................................16
1.0.20 Setting the time ...................................................................... 16
1.0.21 Set the AM/PM or 24h mode ................................................. 16
1.0.22 Setting the date ..................................................................... 16
1.0.23 Setting the sound mode (silent modes) .................................. 17
1.0.24 Setting the user preferred units .............................................. 17
1.0.25 Setting the Backlight on duration ........................................... 17
1.0.26 Deactivating the water contacts ............................................. 18
1.0.27 Checking the device ID .......................................................... 18
1.1 Settings at the dive mode ...................................................................... 19
1.2 Gas settings .......................................................................................... 19
1.2.1 Set Gas 1 ............................................................................... 20
1.2.2 Set Gas D .............................................................................. 20
1.2.3 Nitrox reset time ..................................................................... 21
1.2.4 Desaturation reset .................................................................. 21
1.3 SCUBA settings .................................................................................... 22
1.3.1 Maximum dive depth alarm .................................................... 22
1.3.2 Maximum dive time alarm ...................................................... 22
1.3.3 Setting the Micro Bubble level ................................................ 22
1.3.4 Setting the Safety stop timer .................................................. 23
1.3.5 Set HR limits (Workload settings) ............................................ 23
1.3.6 Set the PDI Stop .................................................................... 23
1.3.7 Selecting the salt (ocean) or fresh water ................................. 24
1.4 Apnea Settings ...................................................................................... 25
1.4.1 Setting the dual depth alarm .................................................. 25
1.4.2 Setting the depth incremental alarm ....................................... 25
1.4.3 Setting the dive time interval alarm ......................................... 26
1.4.4 Setting the surface interval alarm ............................................ 26
1.4.5 Setting the low Heart Rate limit alarm ..................................... 26
1.4.6 Setting the Ascent speed alarm ............................................. 26
1.4.7 Setting the water density ........................................................ 27
ALADIN SQUARE USER MANUAL
3
1.5
1.6
1.7
4
Set Up/Down Time Counter for the dive ................................................ 27
Algorithm selection ................................................................................ 27
HR enable ............................................................................................. 28
2.
Square as a dive computer ................................................................................ 28
2.1 Diving with Square ................................................................................. 28
2.2 Altitude diving ........................................................................................ 29
2.2.1 Altitude classes, altitude warning and no-fly time after a dive. . 29
2.2.2 Altitude and the decompression algorithm .............................. 30
2.2.3 Prohibited altitude .................................................................. 30
2.2.4 Decompression dives in mountain lakes ................................. 31
2.3 No-dive warning after a dive .................................................................. 31
2.4.1 Desaturation reset ................................................................. 31
2.5 Diving with nitrox or with another decompression gas ........................... 32
2.5.1 Diving with more than one gas mix ......................................... 33
2.5.1.1 Switching gas mixture during the dive .........................33
2.5.1.2 Switching back to a gas mixture with lower oxygen
concentration ..............................................................34
2.5.1.3 Gas switch not carried out at the planned depth .........34
2.5.1.4 Delayed gas switch .....................................................34
2.5.1.5 Manual gas switch at a depth deeper than its MOD ....34
2.5.1.6 Submerging below the MOD after a gas switch ...........34
2.6 Warnings and alarms ............................................................................. 34
2.6.1 CNS O2 = 75% ....................................................................... 35
2.6.2 No-Stop time = 2 minutes ...................................................... 35
2.6.3 Entering decompression ........................................................ 35
2.6.4 Entering level stops ................................................................ 35
2.6.5 L0 no stop time = 2 minutes when diving an MB level ............ 36
2.6.6 Entering deco when diving an MB level .................................. 36
2.6.7 Ascent rate ............................................................................ 36
2.6.8 MOD/ppO2 ............................................................................. 37
2.6.9 CNS O2 = 100% ..................................................................... 37
2.6.10 Missed decompression stop .................................................. 38
2.6.11 Low battery ............................................................................ 38
2.7 Display information ................................................................................ 38
2.7.1 Display configuration during the dive ...................................... 39
2.7.2 Setting bookmarks ................................................................. 39
2.7.3 Safety stop timer .................................................................... 40
2.7.4 Activating the backlight .......................................................... 40
2.7.5 Diving with MB levels ............................................................. 40
2.7.6 Display information ................................................................. 40
2.7.7 Display of underlying L0 decompression information .............. 41
2.7.8 Cascading MB levels .............................................................. 41
2.7.9 Level stop ignored/MB level reduced ...................................... 41
2.7.10 PDI Stops .............................................................................. 41
2.8 Gauge mode ......................................................................................... 42
2.9 Apnea mode ......................................................................................... 43
3.
Square accessories ............................................................................................ 44
3.1 HR belt .................................................................................................. 44
ALADIN SQUARE USER MANUAL
Square PC interface ............................................................................................ 45
4.1 Shark .................................................................................................... 45
4.2 Introduction to SCUBAPRO LogTRAK ................................................... 45
4.2.1 Download dive profiles ........................................................... 45
4.2.2 Change warnings/settings of the Square and reading computer
info ......................................................................................... 46
5.
Taking care of Square .........................................................................................
5.1 Technical information .............................................................................
5.2 Maintenance .........................................................................................
5.3 Replacing the battery in Square .............................................................
5.4 Warranty ................................................................................................
6.
Glossary ............................................................................................................... 49
7.
Index ..................................................................................................................... 51
ALADIN SQUARE USER MANUAL
English
4.
47
47
47
48
48
5
1.
INTRODUCTION TO
SQUARE
Your Square User Manual is divided into
five main chapters.
1 Introduction to Square. This chapter
provides an overview of the Square
computer and describes its operating
modes and functions when on the surface.
2 Square as a dive computer. This
chapter describes all settings and functions
of Square as a dive computer and takes
you underwater with Square. It’s about
everything Square can and will do to
enhance your safety and fun underwater.
3 Square accessories. This chapter
describes briefly the Square extras that you
can purchase to get maximum out of your
dive computer in all conditions.
4 Square PC interface. This chapter is
about personalization and customization.
It describes how to change settings, to
download and manage your logbook.
Square is a technologically-advanced
instrument that can accompany you
during your underwater adventures while
providing you with accurate depth, time
and decompression information.
The buttons allow operating functions,
access menus and changing settings while
on the surface. During the dive they set
bookmarks; show further information on
the computer screen, change the gas and
activate the backlight.
Square has been designed for easy use
from the first day on for the beginner with
standard factory settings but the selections
and features allow the advanced user
to customize according to their specific
needs. So, it is recommended to study and
understand this manual before diving with
your Square.
It is time to dive into the details now. We
hope you will enjoy getting to know your
new computer and we wish you many
happy dives with Square.
1.0.1
Buttons
Square has one navigation button. It can be
pressed from left or right side. The shape
has been selected so that even with thick
neoprene gloves you can follow the button
from left to right with your finger without
loosing the touch of the button.
Both left and right ends of the navigation
button have different functions when pressed
short or pressed and hold (long press).
Generally the buttons operate as follows:
Left short = scroll left at the menu “left”, “L”
Left long = escape “ESC”
Right short = scroll right at the menu “right”, “R”
Right long = select or confirm the setting “SEL”
6
ALADIN SQUARE USER MANUAL
Display
The display information has been divided in
a pattern of a dive profile.
Various situations like ascent, descent,
stops can be easily located from the profile.
1.0.3
Heart Rate Option
Square firmware may be delivered without
the heart rate option. In this case please
ignore the user manual descriptions
referring to heart rate functions.
1.0.4
Battery
Square uses a battery of the type CR2450
which is available from your SCUBAPRO dealer.
Square will shortly test the battery status
after each activation (switch on) and
indicate only the state if the battery is too
low. In addition, you can verify the status
of the battery by providing the check at the
main menu: Checking the battery status.
A battery level indication
 NOTE:
LO means that battery has some
WARNING
Starting a dive when the battery LO is indicated can
cause the computer to fail during the dive! Replace
the battery before any diving activity if the battery
LO appears. When the ‘do not dive symbol’ appears
with the text change battery Square can not be
used for diving before a fresh battery is replaced.
English
1.0.2
Please refer to chapter Checking the
battery status for details how to check
your Square battery status.
WARNING
Replacing the battery requires opening the
electronic compartment of Square. You must take
extreme care when performing the battery change
operation in order to ensure the water tightness of
the dive computer. Failing to do so will cause the
dive computer to flood during your next dive and
permanently ruin it. Damage to Square due to an
improper battery replacement is not covered by
warranty. We strongly recommend having the
battery change operation be carried out by your
SCUBAPRO appointed dealer.
See chapter Replacing the battery in
Square for information on how to replace
the battery.
reserve left but battery change is
recommended before a dive. Also,
with LO level battery the backlight and
alarm tones are not activated.
ALADIN SQUARE USER MANUAL
7
1.0.5
Square operation
The diagram below shows the main menu logic in a chart form. The diving functions are
described detailed at chapter Square as a dive computer.
TIME & DATE
+ no dive / fly
R DESAT R DIVE SET R
R
R Check R Altitude
(until L
LOG L Planner L battery
symbols (during L
L
L
meter
complete) summary
desaturation)
ESC
ESC
ESC
SEL
SEL
SEL
Press SEL will
R
switch
Logbook
ID
Planner
Surface
pages
number
pages
Interval
Square off
R
L
Set
menu L
ESC
R
L
R
ESC
R
SEL
R
Set dive L Set time L
SEL
Dive
settings
ESC
Menu
lock L
SEL
Clock
settings
The reference point for any description of Square is the main time of day display. This is
the display that appears after waking the Square up from sleep mode by pressing the right
button and in which the current time and date are shown.
By simply pressing buttons right or left
from the time of day display you can scroll
through the various menus in SQUARE.
The chart above shows the sequence of
the menus. Note that when you first reach
a menu, you are “outside” of it. You must
press SEL to enter the actual menu.
After a dive the display may appear
as shown below, indicating maximum
allowed elevation where diver may ascent,
desaturation time and no repetitive dive
symbol (too short interval):
When Square has wet contacts
 NOTE:
activated and they detect moisture in
between, the Square goes automatic
to Surface display.
1.0.6
Surface display
When you have not been diving with your
Square for a while (no desaturation left)
the surface mode may appear as shown
below, indicating settings like the operation
mode (scuba, gauge, apnea), water type,
heart rate, MB level and gas mix:
8
1.0.7
Surface interval counter
After a dive you can check your surface
interval by pressing SEL at the surface
display. The text Int and a time appears
to the display. The surface interval counter
counts until desaturation is complete, after
that this display cannot be selected.
ALADIN SQUARE USER MANUAL
English
Different combinations m&˚C,
 NOTE:
Ft&˚C, m&˚F or Ft&˚F can be selected
from the dive mode menu: Units.
1.0.9
Planning a dive
Planner
ESC
1.0.8
Checking the Altitude
SEL
Surface
Interval
SEL
Depth/
time
ESC SEL
At the altitude menu the current altitude is
calculated from the barometric pressure
and shown at the bottom row left. The
current altitude class is shown at middle row
right and this is used as ambient pressure for
diving algorithm calculations. At the bottom
row right the current temperature is shown.
barometric pressure is a variable
 NOTE:
changing with weather and atmospheric
pressure at that elevation. Dive algorithm
uses Altitude Classes which are directly
derived from the barometric pressure.
Altitude is counted from the current
barometric pressure and it is therefore a
relative value.
The altitude can be adjusted when current
elevation is known by pressing the SEL. The
altitude value will start blinking. By pressing
right or left the value can be adjusted in
10m/50feet steps. By pressing SEL you
can confirm the altitude value. Adjusting the
altitude elevation has no effect on altitude
class. More about diving in altitudes is
explained in chapter Altitude diving.
You can plan your next dive based on your
body’s nitrogen saturation. The planner is
also using following information:
1. Selected oxygen concentration and
active tanks
2. Selected water type
3. Selected MB level
4. Water temperature of the most recent dive
5. Altitude range
6. Status of tissue saturation at the time the
planner is started
7. A normal workload of the diver and
observance of the prescribed ascent rates.
By pressing SEL at the planner menu you
will get into the planner directly or to the
surface interval setting (repetitive dive).
When Square is in Gauge or
 NOTE:
Apnea modes the Planner is disabled
and Planner OFF is shown in this menu.
ALADIN SQUARE USER MANUAL
9
WARNING
If you have set ppO2max to OFF, the planner will
allow depths up to maximum of 120m/394ft.
Air/nitrox dives with high ppO2 are extremely
dangerous and can lead to death. Be aware that
exposures to high ppO2 will lead CNS clock value to
exceed maximum recommended 100%.
NOTE: The dive planner considers all
 programmed
gas mixtures to be used
In case you have done a dive and you
plan to make another dive during the
desaturation phase, you must start a plan
by giving the time you would still stay at the
surface.
By pressing the right or left you can step
the time in 15 minutes steps.
In case Square is displaying the no-dive
warning, the duration of the warning itself is
displayed as recommended surface interval
for planning purposes (rounded up to the
nearest fifteen-minute increment).
When surface interval is given or if you
have no remaining desaturation left, the
planner depth value starts blinking. By
pressing right or left you can set the depth
in 3m/10feet steps.
The no decompression dive time is shown
for that depth at the top row right.
Minimum depth for planning is 9m/30feet.
The planner allows only depths according
to maximum ppO2 given to the GAS1. If
GAS1 MOD is shallower than 9m/30feet,
planning is not allowed and information LO
ppO2 is shown.
The gas oxygen content and maximum
ppO2 settings are given at the dive mode
menu: SET GAS.
10
at the planned dive when computing nostop times or decompression schedules.
By pressing SEL for planned depth the dive time
appears at bottom row. Start point (minimum now)
is the no decompression time. By pressing right or
left you may change the time in 1 minute steps.
When no decompression time is exceeded the
planner gives the deepest decompression depth
and time on top of the black DECO STOP symbol.
MB level stops (if selected) are shown at the same
place just with symbol STOP. Total Ascent Time
(TAT) is shown at the middle right. Total Ascend
Time (TAT) is shown at the middle right.
If the plan reaches CNS clock limit of 75%
the symbols CNS O2% starts blinking and
replaces the TAT value at middle right.
By pressing SEL or ESC the planner will exit
and you will get to the main menu.
1.0.10
Reading the Logbook
Dive
Log
ESC
R
SEL
R
History L
R
Dive 1 L
ESC
R
Dive 2 L
Dive n L
SEL
R Dive 1
Dive 1
In time L Out time
ALADIN SQUARE USER MANUAL
You can check the main information about
your dives from the logbook by pressing
SEL at the log menu.
The first page shown is the dive history.
The computer with display shown above
has logged the deepest dive of 30.8 meters
and longest dive time of 35 minutes. In total
8 hours of diving and 6 dives has been done
with this Square. History cannot be erased.
By pressing right or left you can scroll the
dives in the memory.
1.0.11
English
By pressing SEL you will select the dive
and get to the sub display which shows in
SCUBA mode the dive start time and date.
By pressing right you will get to next sub
display that shows surfacing time and
average depth.
By pressing right you will get to next sub
display that shows heart rate data:
SCUBA log’s
In SCUBA mode there is a main page
showing depth, dive time, log number,
Gas 1 content, temperature and possibly
symbols like no repetition dive.
ALADIN SQUARE USER MANUAL
11
1.0.12
Apnea log’s
In Apnea mode the main page shows max
dive session depth, total dive session time,
log number, amount of dives at the session
and max dive time at the session:
By pressing right you will get to next sub
display that shows the water density and
lowest heart rate of the session:
1.0.13
By pressing SEL you will select the dive
and get to the sub display which shows in
Apnea mode the dive start time and date:
By pressing right you will get to next
sub display that shows surfacing time,
maximum ascent rate of the session and
the deepest water temperature:
12
Gauge log’s
In Gauge mode the main page shows depth,
dive time, log number and temperature:
By pressing SEL you will select the dive
and get to the sub display which shows in
Gauge mode the dive start time and date.
ALADIN SQUARE USER MANUAL
Indicator in Battery status
Function
battery status
limitations
display
High
Fresh battery
none
Medium
Battery ok for
none
diving
Low
Weak battery, Acoustic alarms
change to fresh and Backlight
not operating,
diving not
recommended
English
By pressing right you will get to next sub
display that shows surfacing time and
average depth:
The battery capacity and voltage
 atNOTE:
the end of the lifetime may vary
1.0.14
Checking the battery status
The battery status menu shows how much
energy is left in the CR2450 battery. A fresh
battery shows high.
Square is periodically measuring the
battery status and you can manually trigger
a measurement by pressing SEL in battery
status menu.
between battery manufacturers. Generally
operation at low temperatures decreases
the battery capacity. Therefore, when the
battery indicator drops to Low, change
the battery to a fresh one before next dive.
1.0.15
Settings
By pressing SEL at the Set menu (and if
settings lock is deactivated) you come to
time set selection.
The intelligent battery algorithm will limit
some functions towards the end of the
lifetime. See the table below for the status
and functions.
If the setting lock is activated Square will
request the lock pin number before the
settings can be edited.
ALADIN SQUARE USER MANUAL
13
By pressing SEL you will confirm the setting.
If you enabled the code the next page will
appear blinking the first digit. By pressing
right or left you may select any number
between 0 and 9. By pressing SEL the first
digit is set and next digit starts blinking.
After the 3rd digit is confirmed by pressing
the SEL the code will be set.
1.0.16
Settings Lock
Square is delivered with factory settings for
easy start on normal air diving. As a default
the setting lock is deactivated. If you wish
to lock the settings for example to prevent
the value changes for rental use then the
lock can be activated at settings main
menu by selecting Code on and giving a
personal 3 digit pin number.
By pressing left after selecting the set menu
the code off is shown. By pressing SEL the
state on or off starts blinking and you may
change this by pressing right or left.
14
NOTE: At battery change the lock pin
 number
will be reset and lock will be
deactivated.
ALADIN SQUARE USER MANUAL
English
Set
Menu
ESC
Lock
code
if enabled
R
ID
number
ESC
R
L
SEL
Set dive
ESC
All segments
on
Set time
R
L
Menu
lock
L
ESC
SEL
SEL
R
L
Dive settings
SEL
SEL
Clock
settings
Lock pin
number
Settings are divided into two main categories namely clock settings and dive settings.
1.0.17
Time set menu
By pressing SEL at the set time menu the following selections can be scrolled by pressing
right or left button.
Set
Time
ESC/L
SEL
Alarm R
clock L
1.0.18
UTC
R
L
Set
R
R
R
R
Set
Set
L Set Date L Sound L
Clock L 12/24h
mode
Setting the alarm clock
Units
R
L
Light on R Wet
duration L contacts
By pressing SEL the minutes will start
blinking and by pressing right or left you
can scroll them.
By pressing SEL the state of alarm will start
blinking and can be selected either on or off
by pressing right or left.
Pressing SEL button will confirm the
settings.
NOTE: Sound off setting does not affect
 the
alarm clock. However, intelligent
By pressing the SEL at alarm menu the
hours of the alarm will start blinking.
You can scroll the hours setting by pressing
right or left.
ALADIN SQUARE USER MANUAL
battery stretching algorithm disables all
warning tones when the battery indication
is showing “LO”.
15
1.0.19
Setting the UTC
Set the AM/PM or 24h mode
UTC setting will change the shown time
compared to Greenwich 0-Meridian. This
feature is practical when traveling through
different time zones.
By pressing SEL at UTC menu, the hours
will start blinking. You may edit them in
range of -13..+14 hours by pressing right
or left. By pressing SEL the minutes will
start blinking and you may edit them in 15
minutes steps by pressing right or left. By
pressing SEL will save the UTC setting.
By pressing SEL at the time mode menu
the numbers 24h or alternatively AM/
PM start blinking. By pressing right or left
you may change between the modes. By
pressing SEL the mode will confirmed.
1.0.20
1.0.22
Setting the time
In set time menu the current time is shown
on the menu. By pressing SEL the time
setting will be activated and hours start
blinking. You may change the hours by
pressing right or left. By pressing the SEL
the minutes start blinking and you may
now edit them by pressing right or left. By
pressing SEL the new time will be set.
seconds cannot be edited;
 NOTE:
they always start counting from 0
when minutes are confirmed by
pressing SEL.
16
1.0.21
the AM/PM selection will
 NOTE:
change the day format to following:
Month.Date.Year. This change takes
place in main time & date display and
in dive computer log book.
Setting the date
By pressing SEL at the date menu the
first two digits of the day/month field start
blinking and they can be changed by
pressing right or left (in 24h mode the first
digit is days, in 12h mode the month is
first). Pressing SEL will confirm the setting
and next two digits start blinking. Again, by
pressing SEL these are confirmed and the
year will start blinking. By pressing right or
left the year can be edited. By pressing SEL
the year will be confirmed.
ALADIN SQUARE USER MANUAL
Setting the sound mode
(silent modes)
1.0.24
Setting the user preferred units
The user may select between depth and
temperature unit combinations. The effect
takes place in dive mode, in the log book,
alarm settings, altitude settings etc.
English
1.0.23
By pressing the SEL at the sound menu one
of the following options start blinking and
they can be scrolled by pressing right or left:
All on = All audible functions are enabled
Warn on = Warnings, Alarms are enabled
Alr on = Alarms are enabled
All off
= All audible functions are disabled
By pressing SEL you will confirm the
setting. In case you want to activate All off
mode (silent mode), the Square will request
the safety pin code.
By pressing SEL in this menu the depth unit
selection starts blinking. By pressing right
or left buttons the value can be changed
between meter and feet. By pressing SEL
the temperature field starts blinking. Again,
by pressing right or left the value may be
changed between °C or °F. By pressing
SEL button both unit settings will be
confirmed.
1.0.25
Setting the Backlight on
duration
By pressing SEL on this menu the backlight
duration at middle row right starts blinking.
By pressing right or left you may scroll
between values:
• time 4,6,8,10,15,20,25,30,40,50,60
seconds
• “--“ OFF backlight deactivated
The selected value will be confirmed by
pressing SEL.
The text code (enter to continue) will appear and
the first digit of the code will start blinking. By
pressing right or left buttons the number can be
edited and by pressing SEL button the number
is confirmed and next number starts blinking.
The unlock code for sound off is: 313.
the all off selection will disable
 NOTE:
all audible dive mode alarms and
warnings. This is potentially dangerous.
the only exception to the silent
 NOTE:
operation is the alarm clock, it will
alarm when activated even if main
setting is: All off.
ALADIN SQUARE USER MANUAL
17
1.0.26
Deactivating the water contacts
1.0.27
Checking the device ID
By pressing SEL on this menu the selection
on or off at the bottom row starts blinking. By
pressing right or left you may select between
active or inactive water contacts. You may
confirm the selection by pressing SEL again.
by selecting water contacts off
 NOTE:
you may delay your dive start time up
to 1 minute. However, with inactive
water contact you prevent you Square
from switching to dive ready mode
when moisture for example at your
gear bag would accidentally activate
the water contacts.
18
Every Square has an individual ID
number. 10 digits are shown in this
menu. This number is used for secure
coding your log book and other
communication with PC/MAC.
By pressing SEL in this screen the Square
will show all the display segments for 3
seconds and returns showing ID after that.
ALADIN SQUARE USER MANUAL
1.1
Settings at the dive mode
English
The dive computer functions of Square on the surface include, among others, setting the
oxygen concentration for nitrox diving, setting the MB level of the decompression algorithm,
setting various warnings and personal preferences.
By pressing SEL at the Settings menu (and if settings lock is deactivated) you can scroll to
DIVE settings by pressing right or left and confirm the selection by pressing SEL.
Set Dive
ESC
R
SEL
Set Gas
ESC
R
L
ESC
SEL
SEL
SCUBA
settings
Gas settings
1.2
R
L
Set
SCUBA
Set
Apnea
ESC
R
L
Counter
R
R
L Algorithm L
HR
enable
L
SEL
Apnea
settings
Gas settings
By pressing right or left at the dive settings you can scroll to Set Gas menu. By pressing
SEL at this display will bring you to sub menu that allows changes to used Gas options in
SCUBA mode.
Set GAS
ESC
SEL
R
Set Gas 1
ALADIN SQUARE USER MANUAL
R
L
Set GAS D
R
L
Nitrox reset
time
R Desaturation
L
L
reset
19
1.2.1
Set Gas 1
You may use your Square with the all nitrox
mixes from Air to pure oxygen.
By pressing the SEL in this display the
oxygen content of the Gas 1 starts blinking.
By pressing right or left you may scroll the
value from 21 up to 100%.
By pressing SEL the ppO2 starts blinking.
By pressing right or left you may select the
value from 1.00 bar up to 1.60 bar. The
Maximum Operation Depth (MOD) for the
gas and selected ppO2 is shown at the
bottom right.
Diving with a ppO higher than
 NOTE:
1.4 is dangerous and may lead to
2
unconsciousness, drowning and death.
ppO is fixed to 1.60 bar when
 NOTE:
selected oxygen content is 80% or
2
higher.
1.2.2
It is possible to disable the MOD setting
(- - shown at the field), but this requires
the security code 313 from the user. By
pressing the SEL button the user will
accept the given value.
20
Set Gas D
When you are planning to make an
extended no stop dive or decompression
dive with another mix for accelerated
decompression you may enable the Gas D.
As a default the value the Gas D is disabled
and the content field is blank.
You may select the Gas D content and
ppO2 combination so that the MOD is
3m/10ft shallower than with Gas 1.
By pressing SEL at this display the oxygen
content starts blinking. By pressing right
or left buttons you may scroll the value. By
pressing the SEL the ppO2 value starts to
blink. By pressing right or left the value may
be selected from 1.00 bar up to 1.60 bar in
0.05 bar steps. By pressing SEL the Gas D
setting is confirmed and will be used at the
next dive or planner use.
ALADIN SQUARE USER MANUAL
2
To learn more about multi gas
 NOTE:
diving, read the chapter: Diving with
more than one gas mix.
1.2.3
will appear. By pressing right or left the
numbers can be edited. By pressing SEL
the digit is confirmed and the next digit can
be edited. After 3rd number, when correctly
given the desaturation reset becomes
effective and desat time is reset to 0.
English
Gas d is disabled when -- is
 NOTE:
shown at %O contents field.
Nitrox reset time
If you are generally diving with one gas or air
only and want to return to this setting after
occasional nitrox or multi gas dive, you can
preset a default time when your Square will
reset to air and disable the Gas D.
By pressing SEL in this menu the nitrox reset
time starts blinking. By pressing right or left
you may scroll the reset time from 1 hour up
to 48 hours or disable the nitrox reset time
option by selecting --. By pressing SEL the
nitrox reset time will be confirmed.
1.2.4
Desaturation reset
WARNING
Resetting desaturation will effect calculations of the
algorithm and this may lead to serious injury or death.
Do not reset desaturation without a solid purpose.
When Square is still counting down the
desaturation, some menu changes are not
possible. In case the user decides to reset
the desaturation, the safety code 313 must
be given. This procedure secures unwanted
resetting and the desaturation reset will be
stored to a memory. At the next dive log the
desaturation symbol will be shown.
By pressing SEL at this menu the enabling
field text starts blinking. By pressing right or
left you may select between on or off. By
selecting off the safety code input screen
ALADIN SQUARE USER MANUAL
21
1.3
SCUBA settings
A set of SCUBA related selections are grouped to this menu.
Set
SCUBA
ESC
SEL
R Max Depth
alarm
R Dive Time R
L
L
alarm
R
MB Level L
R
Safety
stop timer L
1.3.2
Set HR
limits
R
L
R Salt / Fresh
PDI Stop L
water
L
Maximum dive time alarm
By pressing SEL in this menu the time value
starts to blink. By pressing right or left the
value can be selected from 5 up to 195
minutes in 5 minute steps. By pressing
SEL button the function starts blinking
and you may select between on or off by
pressing right or left buttons. The selection
is confirmed by pressing SEL button.
By pressing the SEL button the following
menu’s can be scrolled down by pressing
right or left.
1.3.1
Maximum dive depth alarm
By pressing SEL in this menu the depth
value starts blinking. By pressing right or
left the value can be selected from 5 up to
100 meters (20..330 feet) in 1m/5ft steps.
By pressing SEL the function starts blinking
and you may select between on or off by
pressing right or left buttons. The selection
is confirmed by pressing SEL button.
22
1.3.3
Setting the Micro Bubble level
By pressing SEL in this menu the Micro
Bubble level starts to blink. By pressing right
or left you may select personal setting from
L0 up to L5. L5 is the most conservative
setting. The selection is confirmed by
pressing SEL button.
ALADIN SQUARE USER MANUAL
1.3.4
Setting the Safety stop timer
By pressing SEL at this menu the function at
bottom row will start blinking and by pressing
right or left following options may be selected:
Off = safety stop timer is not activated
Push = safety stop timer will start at the end
of the dive with button press
Auto = safety stop timer will start automatic
when the depth at the end of the
dive becomes less than 5m/15ft
and all decompression or MB stops
have been accomplished.
By pressing SEL the function is confirmed and
the time starts blinking. By pressing right or
left you the value may be selected from 1 to 5
minutes. By pressing SEL the time is confirmed.
for some time. If you want to learn more
about the heart rate related to diving, you
may read a SCUBAPRO booklet 2012:
Dr. Uwe Hoffmann, Dr. Tobias Dräger,
“Sicherer Und Besser Tauchen Mit
Herzfrequenzmessung.
English
more about diving with the MB
 NOTE:
levels, read chapter: Diving with MB levels.
Refer to chapter HR enable to
 NOTE:
learn how HR function can be enabled.
1.3.6
Set the PDI Stop
By pressing SEL the PDIS function starts
blinking. By pressing right or left the value
can be set to on or off. By pressing SEL the
setting is confirmed.
1.3.5
Set HR limits
(Workload settings)
By pressing SEL in this menu the HR high
value starts blinking. By pressing right or
left the value can be changed from 140 up
to 220. This is your maximum heartbeat
setting, when you are for example diving
against the current. By pressing SEL the
low value starts blinking. By pressing right
or left the value can be changed from 60
up to 120. This is your heartbeat when you
are relaxed in the water and for example
holding from the anchor line. By pressing
SEL again the limits are confirmed.
To learn more about diving with
 NOTE:
PDI stop, read the chapter PDI Stops.
Diving experience and sport
 NOTE:
exercises have an effect to your heart rate
limits during diving. You may need to edit
the limits after you have used your Square
ALADIN SQUARE USER MANUAL
23
1.3.7
Selecting the salt (ocean) or
fresh water
Square measures a pressure and converts
depth from it by using the water density as
a constant. 10m/33ft depth at salt water
corresponds approximately to 10.3m/34ft
at fresh water.
By pressing SEL at this menu the Salt or
Fresh at the bottom row starts blinking.
You may scroll between these two settings
by pressing right or left and confirm the
selection by pressing SEL.
24
ALADIN SQUARE USER MANUAL
1.4
Apnea Settings
English
Apnea diving related selections are grouped in this menu.
Set Apnea
ESC
SEL
R Dual Depth
alarm
Depth
R
R Dive Internal R
L Incremental L
L
alarm
alarm
Surface
Inteval
alarm
R
L
Low HR
alarm
R
L
Ascent
Speed
Alarm
R
L
Water
Density
L
The first alarm is short
 NOTE:
sequence for attention and the second
alarm is continuous. By setting the first
alarm deeper than the second, it will
be masked by the continuous alarm
and you cannot hear the first one.
1.4.2
By pressing the SEL button the following
menu’s can be accessed.
1.4.1
Setting the dual depth alarm
By pressing the SEL at this menu the first
depth starts blinking. By pressing right/
left buttons you may select the first depth
alarm from 5 to 100 meters (20..330 feet).
By pressing SEL the first value is confirmed
and the second alarm starts blinking. Like
the first, by pressing right or left buttons
the second alarm may be set from 5 to 100
meters. By pressing SEL the function starts
blinking and you may select between on or
off by pressing right or left. By pressing SEL
the settings are confirmed.
ALADIN SQUARE USER MANUAL
Setting the depth
incremental alarm
By pressing the SEL in this menu the
incremental depth alarm starts blinking.
By pressing right or left you may select the
alarm value from 5 to 100 meters (20..330
feet). By pressing SEL the alarm value
will be confirmed and the function at the
bottom row starts blinking. By pressing
right or left you may select the direction for
the depth incremental alarm: off, dn(down),
up or both. By pressing SEL the settings
are confirmed.
25
1.4.3
Setting the dive time interval
alarm
By pressing SEL at this menu the dive time
interval alarm starts blinking. By pressing
right or left you can select the interval from
15 seconds up to 10 minutes in 15 second
steps. By pressing SEL button the function
starts blinking and you may select on or off
by pressing right or left. By pressing SEL
the settings are confirmed.
1.4.4
Setting the low Heart Rate
limit alarm
In apnea diving a low heart rate is a key for
low oxygen consumption and therefore for
longer dives. However, too low of pulse at
depth may lead to loss of awareness and
can be therefore dangerous.
By pressing SEL at this menu the low heart
rate alarm value starts blinking. By pressing
right or left you can set the value from
25 to 100 beats per minute. By pressing
SEL button the function starts blinking.
By pressing right or left you may select
between on or off. By pressing SEL the
settings are confirmed.
Setting the surface interval
alarm
By pressing SEL button at this menu the
surface interval time starts blinking. By
pressing right or left you can select the
interval from 15 seconds up to 10 minutes.
By pressing SEL button the function
blinking and you may select on or off by
pressing right or left. By pressing SEL the
settings are confirmed.
26
1.4.5
1.4.6
Setting the Ascent speed alarm
By pressing SEL at this menu the ascend
speed starts blinking. By pressing right or
left you may select the value from 0.1 to
5.0 meters/second (1..15 feet/second). By
pressing SEL the function starts blinking.
By pressing right or left you may select
between on or off. By pressing SEL the
settings are confirmed.
ALADIN SQUARE USER MANUAL
Setting the water density
When apnea diving the exact depth is very
important value. For the most accurate
reading you must select the correct density
of the water. Density depends on water
temperature and salinity (salt content).
Some approximated densities at 20˚C/68˚F
water.
• Average Ocean water has approximately
1.025 kg/liter.
• Mediterranean Sea has approximately
1.027 kg/liter.
• Red Sea has approximately 1.029 kg/liter.
• Black Sea has approximately 1.012 kg/liter.
• Baltic Sea has approximately 1.004 kg/liter.
• Fresh water (lake/quarry) has density
approximately 1.000 kg/liter.
By pressing SEL at this menu the water
density value starts blinking. By pressing
right or left you may change the value
from 1.000 to 1.050 in steps of 0.001. By
pressing SEL the settings are confirmed.
1.5
Set Up/Down Time
Counter for the dive
There are many situations during a dive
where a simple stop timer which is
independent from dive time is practical;
for example timed tasks at dive courses or
special missions etc.
Square has a stop timer integrated on
the SCUBA mode, which has to be
configured before the dive in this menu.
By pressing SEL at this menu the function
starts blinking. By pressing right or left you
may select between up, dn(down) or off.
By pressing SEL the counter time starts
blinking and you may set it from 5 second
ALADIN SQUARE USER MANUAL
up to 99 minutes and 55 seconds in 5
second steps by pressing right or left.
By pressing SEL the settings are confirmed.
1.6
English
1.4.7
Algorithm selection
You may select your Square operation
mode between SCUBA, Gauge and Apnea
modes.
When Square has not been submerged for
a while the display looks as follows:
Since the Gauge and Apnea modes are
not tracking the tissue saturation, there
is 48h locking interval after the last dive
in gauge or apnea mode before change
to a SCUBA mode is possible.
After a SCUBA dive the limitation to change
the mode is valid until desaturation is
complete.
Square shown below has been diven
in apnea mode and the NO CHANGE
limitation is still on for another 47 hours.
27
2.
If you decide to change between modes
before the 48h interval or full desaturation
you have to go to desaturation reset menu
and make a manual desaturation reset.
By pressing the SEL at this menu the mode
starts blinking. By pressing right or left you
may select between SCUBA, gauge or
apnea modes. By pressing SEL the setting
is confirmed.
1.7
SQUARE AS A DIVE
COMPUTER
Square is a full-featured diving computer,
capable of multigas decompression
calculations, ascent rate calculations
and warnings. The logbook can store
about 50 hours of dive profiles with a 4s
sampling rate. During diving it displays
depth, dive time, decompression status,
water temperature and much more. On the
surface after a dive, remaining desaturation
time, no-fly time, surface interval and
prohibited altitude classes are shown.
2.1
Diving with Square
The functions of the buttons during diving
are summarized in the table below.
Note that Square can be set to three dive
modes: Scuba, Apnea and Gauge. Due to
the operation differences also buttons have
different functions.
HR enable
By pressing SEL at this menu the HR
function starts blinking and by pressing right
or left you may select between on or off.
By pressing SEL the setting is confirmed.
28
ALADIN SQUARE USER MANUAL
LEFT BUTTON
action
backlight
bookmark
APNEA
manual stop the dive
SCUBA
start the “stop watch” counter
mode
press
Short
Long
Short
Short
Short
Long
Short
Long
2.2
2.2.1
Altitude diving
Altitude classes, altitude warning
and no-fly time after a dive.
Going to altitude is in a way similar to
starting an ascent from a dive: you expose
your body to a lower partial pressure
of nitrogen and consequently you start
offgassing. After a dive, given the higher
nitrogen loading in your body, even
reaching an otherwise negligible altitude
can potentially cause decompression
sickness. Consequently, Square constantly
monitors the ambient pressure and uses
it to evaluate your nitrogen loading and
offgassing. If Square notices a drop in
ambient pressure not compatible with your
current nitrogen loading, it will activate
a warning to alert you of the potentially
dangerous situation.
Square shows no fly, no dive and altitude
warning symbols at the main time and date
screen until the restrictions apply. The exact
times can be viewed at desat screen.
Desat screen appears only after a dive or
when an altitude class change has been
detected.
Desat screen disappears after desaturation
is complete. This screen shows the
desaturation time at top row right.
The prohibited altitude (the altitude which
Square has computed to be incompatible
with your current nitrogen saturation levels)
is shown at the desat screen upper row left
until this limitation applies.
At the desat screen Square shows the
no-fly time at bottom row left. The nofly time is the time during which an
exposure to the reduced pressure inside
ALADIN SQUARE USER MANUAL
RIGHT BUTTON
action
alternative display data
select manual gas switch
confirm selected gas switch
reset safety stop timer
switch between HR and dive
number at that session
APNEA
manual start the dive
GAUGE
alternative display data
GAUGE reset average depth counter and
start/stop timer
mode
SCUBA
SCUBA
SCUBA
SCUBA
APNEA
English
press
Short
Long
Long
Long
the cabin of an airplane could cause
decompression sickness, as calculated by
the decompression model in the computer.
By pressing SEL at the desat screen the
display shows elapsed interval from the last
dive and the CNS clock level in % value,
unless it has counted down to 0%.
WARNING
Flying while Square displays the NO FLY symbol can
result in serious injury or death.
29
2.2.2
Altitude and the decompression algorithm
Atmospheric pressure is a function of altitude and of weather conditions. This is an important
aspect to consider for diving, because the atmospheric pressure surrounding you has an
influence on ongassing and offgassing of nitrogen. Above a certain altitude, the decompression
algorithm has to change in order to account for the effect of the change in atmospheric pressure.
Square divides the possible altitude range in 5 classes that are illustrated on the picture below:
The altitude classes are defined in terms of
approximate elevations because the effect
of weather conditions can make the switch
point pressure occur at different levels.
WARNING
At altitude class 4 Square functions in gauge mode
only (automatic switch from computer mode).
2.2.3
Prohibited altitude
Going to altitude, as well as flying after diving,
exposes your body to a reduced ambient
pressure. In a way similar to the no-fly time,
Square advises you which altitudes are safe
to reach after a dive and which aren’t. If you
have to drive over a mountain pass to return
home after a dive, it can be quite important
to have this information.
You can check your current
 NOTE:
altitude class and elevation by
activating the altitude meter. Refer to
chapter Checking the Altitude on
how to do so.
Square
 NOTE:
automatically:
deals with altitude
it
monitors
the
atmospheric pressure every 60
seconds and if it detects a sufficient
drop in pressure, it does the following:
it shows the new altitude range
at altimeter and, if applicable, the
prohibited altitude range at desat
screen; it indicates the desaturation
time, which in this case is an
adaptation time to the new ambient
pressure. If a dive is started during this
adaptation time, Square considers it
a repetitive dive, since the body has
residual nitrogen.
30
The prohibited altitudes are the ones above
the elevation displayed at desat display. In
the example above, the diver should not
reach altitudes of greater than 4000m.
Square has an altitude warning: if you
were to reach an altitude that according to
Square is incompatible with your current
residual nitrogen levels, it will warn you with
an altitude warning.
ALADIN SQUARE USER MANUAL
Decompression dives in
mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
4m/13ft stage and a 2m/7ft stage in
altitude ranges 1, 2 and 3.
If atmospheric pressure is below 610mbar
(altitude higher than 4000m/13300ft), no
decompression calculation is carried out
by Square (automatic gauge mode). In
addition, the dive planner is not available in
this altitude class.
2.3
No-dive warning after a dive
If Square detects a situation of increased
risk (due to the potential microbubble
accumulation from previous dives or a CNS
O2 level above 40%), the NO DIVE symbol
will appear on the display to advise you
against performing another dive right away.
The suggested time interval that you should
wait prior to diving can be checked with planner.
You should not undertake a dive as long
as the no-dive warning is displayed on
the computer screen. If the warning is
prompted by microbubble accumulation
(as opposed to CNS O2 over 40%) and
you dive anyway, you will have shorter nostop times or longer decompression times.
Moreover, the duration of the microbubble
warning at the end of the dive can increase
considerably.
ALADIN SQUARE USER MANUAL
2.4
SOS
If you stay above a depth of 0.8m/3ft for
more than 3 minutes without observing a
prescribed decompression stop, Square
will switch into SOS mode. Once in SOS
mode Square will lock up and will be
inoperable as a dive computer for 24 hours.
If it is used for diving within the 24hours
of an SOS lock, it will automatically
switch to gauge mode and provide no
decompression information.
English
2.2.4
WARNING
Violating a mandatory decompression obligation
may result in serious injury or death.
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.
Do not dive when the computer is in SOS mode.
The desat display shows the same
information as in presence of desaturation,
but at the bottom right row SOS is blinking.
2.4.1
Desaturation reset
Square allows you to reset the desaturation
in the computer. Any tissue saturation
information from a recent dive will be reset
to zero and the computer treats the next
dive as a non-repetitive dive. This is useful
when the computer is loaned to another
diver who has not diven in the last 48 hours.
Description how to make a desaturation
reset is explained at chapter: Gas settings;
Desaturation reset.
31
After a desaturation reset the
 NOTE:
change between the modes: Gauge,
Apnea and Scuba are possible
immediately. However, since the
gauge and apnea modes are not
tracking your tissue nitrogen loading,
it is recommended to keep the initial
intervals between changes on modes.
WARNING:
Diving after having reset the desaturation
is extremely dangerous and is very likely to
cause serious injury or death. Do not reset the
desaturation unless you have a valid reason to
do so.
Removing and replacing the
 NOTE:
battery will not reset the desaturation.
Square stores tissue saturation
information in non-volatile memory. For
the time during which the computer
is without battery, the desaturation
calculation is frozen and resumes from
where it had left off as soon as a new
battery is installed.
2.5
Diving with nitrox or with
another decompression gas
Nitrox is the term used to describe
breathing gases made of oxygen-nitrogen
mixes with oxygen percentage higher than
21% (air). Because Nitrox contains less
nitrogen than air, there is less nitrogen
loading on the diver’s body at the same
depth as compared to breathing air.
However, the increase in oxygen
concentration in Nitrox implies an increase
in oxygen partial pressure in the breathing
mix at the same depth. At higher than
atmospheric partial pressures, oxygen
can have toxic effects on the human body.
These can be lumped into two categories:
Sudden effects due to oxygen partial
pressure over 1.4bar. These are not related
to the length of the exposure to high partial
pressure oxygen, and can vary in terms
of the exact level of partial pressure they
happen at. It is commonly accepted that
partial pressures up to 1.4bar are tolerable,
and several training agencies advocate
32
maximum oxygen partial pressures up to
1.6bar.
Long exposure effects to oxygen partial
pressures over 0.5bar due to repeated and/
or long dives. These can affect the central
nervous system, cause damage to lungs or
to other vital organs. Long exposures can
be divided to more severe Central Nervous
System effects and less dangerous long
term Pulmonary Toxicity effects.
Square treats high ppO2 and long exposure
effects in the following ways:
Against sudden effects: Square has an MOD
alarm set for a user-defined ppO2max. As
you enter the oxygen concentration for the
dive, Square shows you the corresponding
MOD for the defined ppO2max. The
default value of ppO2max from the factory
is 1.4bar. This can be adjusted to your
preference between 1.0 and 1.6bar. It can
also be turned OFF. Please refer to chapter
Gas settings for more information on how
to change this setting.
Against long exposure effects: Square
“tracks” the exposure by means of the
CNS O2 clock. At levels of 100% and higher
there is risk of long exposure effects, and
consequently Square will activate an alarm
when this level of CNS O2 is reached.
Square can also warn you when the CNS O2
level reaches 75% (see section CNS alarm).
Note that the CNS O2 clock is independent
of the value of ppO2max set by the user.
The CNS O2 clock increases when the
oxygen partial pressure is higher than 0.5bar,
and decreases when the oxygen partial
pressure is lower than 0.5bar. Hence, while
on the surface breathing air you will always
be decreasing the CNS O2 clock. During the
dive, the depth at which 0.5bar is reached
for various mixes is as follows:
Air:
13m/43ft
32%:
6m/20ft
36%:
4m/13ft
The O concentration of gas
 dNOTE:
can only be set to a value higher
2
than the O2 concentration for gas 1.
Square requires that the MODs of gas
1 and gas d be at least 3m/10ft apart.
Setting the ppO2max value to OFF applies
to gas 1 only. Gas d is always limited to
ALADIN SQUARE USER MANUAL
2.5.1
Square enables you to use up to two gas
mixtures during the dive (air and Nitrox only).
The two mixtures are labeled 1 and d, and
must be in ascending order of oxygen content.
English
a maximum value of ppO2max of 1.6bar.
For oxygen concentrations of 80%
and higher, the ppO2max is fixed
at 1.6bar and cannot be changed.
The MOD for gas d is the switch
depth for that gas. This is what
Square uses for its calculation,
warnings and suggested switch point.
When diving with more than one gas
mixture, the Nitrox reset time function
(described in section 2.3.5) has the
following effect:
Gas 1 is set to 21%
Gas d is set to OFF.
Diving with more than one
gas mix
Square is equipped with the ZH-L8 ADT MB
PMG algorithm. PMG stands for Predictive
Multi Gas, meaning that when you program
more than one gas mixture, Square will predict
the switch to the higher oxygen concentration
gas at the depth that you specified and
alert you at all times with a decompression
schedule comprehensive of both gas mixtures
that you programmed. In other words, you
get full credit at any point during the dive for
all the extra gas that you are carrying with you.
At the same time Square can also show you
what the decompression schedule would be if
you were to finish the dive using only the gas
mixture that you are currently breathing from,
so that you can be prepared in the event that
something did not work as planned.
WARNING:
Diving with two gas mixtures represents a
much higher risk than diving with a single gas
mixture and mistakes by the diver may lead to
serious injury or death.
During dives with two gas mixtures, always
make sure you are breathing from the tank
that you intend to breathe from. Breathing
from a high oxygen concentration mix at the
wrong depth can kill you.
Mark all your regulators and tanks so that you
cannot confuse them under any circumstance.
Before each dive and after changing a tank,
ensure that each gas mixture is set to the
correct value for the corresponding tank.
Get a proper training and certifications to
accomplish multigas dives prior of making them.
ALADIN SQUARE USER MANUAL
2.5.1.1
Switching gas mixture during
the dive
During the ascent phase, when you reach
a depth corresponding to the MOD of gas
d, Square will suggest that you perform
the switch. An audible sequence goes
off, and the text gas d starts blinking.
You have 30 seconds to respond to this
message, otherwise Square will consider
that gas d will not be used and adapts the
decompression schedule accordingly. To
confirm the gas switch, press SEL button.
NOTE: Start breathing from the tank
 with
the new gas mixture before
confirming a switch:
WARNING:
Always make sure you are switching to the
intended gas. Failure to do so may result in
serious injury or death.
After you confirm the switch, the text gas d
remains on the screen.
33
if after Square has changed
 NOTE:
the decompression schedule to reflect
the missed gas switch, you descend
again below the MOD for gas d,
Square reintroduces gas d into the
calculations and the decompression
schedule changes accordingly.
2.5.1.4
2.5.1.2
Switching back to a gas
mixture with lower oxygen
concentration
There may be situations in which you have
to switch back to gas 1 from gas d. This
can happen for instance if you want to
descend again below the MOD for gas d,
or if for instance you have run out of gas
d during the decompression. At this point
you can manually initiate the gas switch by
pressing SEL button. Square will display
the text gas 1, blinking. At this point press
SEL button to confirm the switch. Square
will display the text gas 1 and adapt the
decompression schedule accordingly.
2.5.1.5
Gas switch not carried out at
the planned depth
If you fail to confirm the change to gas d
within the 30 seconds of when Square
suggested it, gas d is excluded from
the decompression calculation and the
decompression schedule is adapted
accordingly, basically reflecting the fact that
you will finish the dive using gas 1 only.
34
Manual gas switch at a depth
deeper than its MOD
There may be situations in which you have
no other choice but to switch to a gas
mixture although you are below the MOD
for that mixture. Square does not prevent
you from doing this, but the MOD alarm will
immediately start. Press SEL button to start
the gas switch procedure. Square will show
the text gas d blinking on the display. This
helps you verify that you are performing a
switch to a safe gas. At this point press SEL
button to confirm the switch.
2.5.1.6
2.5.1.3
Delayed gas switch
You can catch up on a planned gas mixture
switch at any time by selecting the gas
manually. Press SEL button to start the gas
switch procedure. Square will show the text
gas d and its MOD blinking on the display.
This helps you verify that you are performing
a switch to a safe gas. At this point press
SEL button to confirm the switch. Square
will display the text gas d without blinking
and adapt the decompression schedule
accordingly.
Submerging below the MOD
after a gas switch
If after having switched to gas d you
inadvertently drop again below the MOD
for that mixture, the MOD alarm will
immediately start. Either switch back to
gas 1, or ascend above the MOD for gas d.
2.6
Warnings and alarms
Square can alert you of potentially
dangerous situations via warnings and
alarms. You can only modify the warning
and alarm settings via PC interface.
ALADIN SQUARE USER MANUAL
WARNING:
2.6.1
English
represent situations that require the diver’s
attention, but ignoring them does not represent
an immediate risk. It is up to you to decide
which ones you would like to be active and
which ones not. The available warnings are:
CNS O2 = 75%
Square tracks your oxygen uptake via the
CNS O2 clock. If the calculated value of
CNS O2 reaches 75%, Square will emit a
sequence of audible beeps for 12 seconds
and the value of the CNS O2 will be blinking
in the lower right corner. The blinking will
continue until the value of CNS O2 drops
under 75%.
2.6.3
Entering decompression
Square can activate a warning when
the first mandatory decompression stop
appears. This alerts the diver to the fact
that a direct ascent to the surface is no
longer possible. This warning applies to
dives with the computer set to L0 only.
Square emits a sequence of audible beeps
and the DECO STOP symbol blinks, both
for 12 seconds, when the no-stop time
ends and a mandatory (L0) stop is required
before reaching the surface.
2.6.2
No-Stop time = 2 minutes
If you wish to avoid unintentionally
performing a decompression dive, Square
can activate a warning when the no-stop
time reaches 2 minutes. This applies to
both L0 no-stop and MB no-stop time
(see chapter Diving with MB levels for more
information on MB level diving). It gives you
the opportunity to start ascending before
incurring a decompression stop or a level
stop obligation.
Square emits a sequence of audible beeps
for 12 seconds and the no-stop time will
blink. The blinking will continue until you
ascend sufficiently for the no-stop time to
grow to 3 minutes, or until Square enters
into decompression.
ALADIN SQUARE USER MANUAL
2.6.4
Entering level stops
When diving with a microbubble (MB) level
different than L0, Square can warn you
when you are no longer in the MB no-stop
phase. See section 2.7.5 Diving with MBLevels for more information on MB level
diving.
Square emits a sequence of audible beeps
and the STOP symbol blinks, both for 12
seconds, when the MB no-stop time ends
and a level stop is required before you
ascend to the surface.
35
Square emits a sequence of audible beeps
and the DECO STOP symbol blinks, both
for 12 seconds, when the L0 no-stop time
ends while diving with an active MB level
higher than L0.
2.6.5
L0 no stop time = 2 minutes
when diving an MB level
When diving with an MB level higher than
L0, the underlying L0 information is not
directly visible on the display (though it is
accessible as alternate information). You
can choose to have Square warn you when
the underlying L0 no-stop time reaches 2
minutes while diving with an active MB level
higher than L0.
Alarms can not be turned off because
they represent situations that do require
immediate action by the diver. There are
five different alarms:
Square emits a sequence of audible beeps
and the MB LVL symbol blinks, both for
12 seconds, when the L0 no-stop time
reaches 2 minutes while diving with an
active MB level higher than L0.
- When in gauge mode, all warnings and all
alarms are OFF aside for the low battery alarm.
- When Square is set to SOUND OFF mode, all
audible alarms and warnings are switched off.
WARNING:
2.6.7
2.6.6
Entering deco when diving
an MB level
When diving with an MB level higher than
L0, the underlying L0 information is not
directly visible on the display (though it is
accessible as alternate information). You
can choose to have Square warn you when
you are about to enter a decompression
obligation while diving with an active MB
level higher than L0.
36
Ascent rate
As you ascend during a dive, the pressure
surrounding you diminishes. If you ascend
too quickly, the ensuing pressure reduction
could lead to microbubble formation. If you
ascend too slowly, the continued exposure
to high ambient pressure means that you
will continue loading some or all of your
tissues with nitrogen. Consequently, there
is an ideal ascent rate that is slow enough
to minimize microbubble formation yet fast
enough to minimize the effect of continued
loading on your tissues.
The pressure reduction that the body can
tolerate without significant microbubble
formation is higher at depth than it is in
the shallows: The key factor is not the
pressure drop by itself, but rather the ratio
of the pressure drop relative to the ambient
pressure. This means that the ideal ascent
rate at depth is higher than it is in the shallows.
Along these lines, Square employs a
variable ideal ascent rate: its value ranges
ALADIN SQUARE USER MANUAL
DEPTH
ASC SPEED
m
ft
m/min
ft/min
0
0
7
23
6
20
8
26
12
40
9
29
18
60
10
33
23
75
11
36
27
88
13
43
31
101
15
49
35
115
17
56
39
128
18
59
44
144
19
62
50
164
20
66
If the ascent rate is greater than 110% of
the ideal value the SLOW symbol appears.
For ascent rates higher than 140%, the
SLOW symbol starts to blink.
WARNING:
The ideal ascent rate must not be exceeded at
any time since this could lead to microbubbles
in the arterial circulation which could cause
serious injury or death.
English
between 7..20m/min / 23..66ft/min and the
actual breakdown by depth range is listed
in the chart below.
The alarm persists for as long as the ascent
rate is 110% or more of the ideal ascent rate.
2.6.8
MOD/ppO2
WARNING:
- The MOD should not be exceeded.
Disregarding the alarm can lead to oxygen
poisoning.
- Exceeding a ppO2 of 1.6bar can lead to
sudden convulsions resulting in serious injury
or death.
If you exceed the MOD, the depth will start
to blink and in the bottom row the MOD is
displayed so you can see by how much you
have exceeded it. In addition, Square will
beep incessantly. Both the blinking of the
depth value and the beeping will continue for
as long as you stay deeper than the MOD.
Square also provides an audible alarm in
case of ascent rates exceeding 110%: the
intensity of the alarm increases in direct
proportion to the degree that the ideal
ascent rate is exceeded.
In case of a fast ascent, Square may
require a decompression stop even within
the no-stop phase because of the danger
of microbubble formation.
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.
Excessive ascent rates for longer periods
are entered in the logbook.
ALADIN SQUARE USER MANUAL
2.6.9
CNS O2 = 100%
WARNING:
When the CNS O2 reaches 100% there is
danger of oxygen toxicity. Start procedure to
terminate the dive.
Square tracks your oxygen uptake via the CNS
O2 clock. If the calculated value of CNS O2
reaches 100%, Square will emit a sequence
of audible beeps for 12 seconds and the value
of the CNS O2 will be blinking in the lower right
corner. The blinking will continue until the value
of CNS O2 drops under 100%.
37
The audible signal is repeated for 5 seconds in
one minute intervals after the first occurrence
and for as long as the value of CNS O2 stays
at or above 100% or until the ppO2 drops
under 0.5bar (see chapter Diving with
nitrox or with another decompression
gas for a list of depths at which ppO2 equals
0.5bar for some typical Nitrox mixes).
2.6.11
2.6.10
During the dive, Square alerts you of
precarious battery situation by displaying
a steady battery symbol on the screen.
This means you can finish the dive but you
should replace the battery once you return
to the surface.
Missed decompression stop
WARNING:
Violating a mandatory decompression obligation
may result in serious injury or death.
If in presence of a required decompression
stop you ascend more than 0.5m/2ft above
the required stop, Square will trigger an
alarm: the value of the current depth and the
value of the required stop depth will blink,
and a sequence of beeps can be heard. This
will continue for as long as you stay 0.5m/2ft
or more above the required stop.
Low battery
WARNING:
Do not start a dive if the battery symbol is
displayed on the screen. The computer may
fail to function during the dive and this could
lead to serious injury or death.
2.7
Display information
Upon immersion, Square will automatically
start to monitor the dive regardless of
what state it was in prior to the immersion.
Details on the information displayed can be
found in the next sections.
The dive time is displayed in minutes. If during
the dive you ascend to the surface, the time
spent on the surface will only be counted if
you descend again below 0.8m/3ft within
5 minutes. This allows for brief periods
of orientation. While on the surface, the
time will not show as progressing but it
is running in the background. As soon
as you submerge, the time will resume,
including the time spent on the surface. If
you spend more than 5 minutes at depth
shallower than 0.8m/3ft, the dive will be
considered ended, the logbook closed and
a subsequent immersion would cause the
dive time to start again from zero.
Maximum displayed time is 199 minutes.
For dives longer than that, the dive time
starts again from 0 minutes.
38
ALADIN SQUARE USER MANUAL
English
Depth: the depth is given in 10cm resolution
when metric mode. When the depth is
displayed in feet, the resolution is always 1
foot. At a depth shallower than 0.8m/3ft,
the display shows --. Maximum possible
depth is 120m/394ft.
No-stop time: calculated in real time and
updated every 4 seconds. Maximum
displayed no-stop times is 99 minutes.
WARNING:
During all dives, perform a safety stop between
3 and 5 meters/10 and 15 feet for 3 to 5 minutes,
even if no decompression stop is required.
Temperature: Square displays the water
temperature during the dive and the air
temperature on the surface. However,
the skin temperature influences the
measurement when worn at the wrist.
Decompression information: when Square
calculates the need for a mandatory
decompression stop, it shows you how
long and how deep your deepest stop is. It
also gives you the total ascent time. Stops
deeper than 27m/90ft and total ascent times
longer than 99 minutes are shown as “- - “.
Decompression information at MB L0: if you
are diving with an MB level different than
MB L0, you can ask Square to show you
the decompression information pertinent to
the underlying MB L0 calculation. For more
information on MB levels, please refer to
chapter Diving with MB levels.
2.7.1
Display configuration during
the dive
Throughout the dive, Square displays the
current depth (top row left), the elapsed dive
time (bottom row left) and the no-stop or
decompression information (top row right).
In addition, Square utilizes the alternate
displayed data at middle and bottom row
right regarding the dive. By pressing right
button will show, in sequence:
1. PDIS depth (when pending)
2. Maximum depth (only if 1m/3ft ascent
detected)
2. Water temperature
3. Heart rate (if activated)
4. O2 %
a. MOD of the active gas (if gas d enabled)
b. If gas 1 active then bail out info using
only gas 1 at the middle row
c. Active MB level
d. No-stop or decompression information
at L0 (displayed in middle row, only if
diving with an MB level other than L0)
5. CNS % if greater than 1%
6. Time of the day in the bottom row for 5
seconds (temperature at bottom row right).
2.7.2
Setting bookmarks
By press and hold LIGHT button you can
set any number of bookmarks as reminders
of particular moments during the dive. The
bookmarks will appear on the dive profile in
LogTRAK.
If the “stop watch” counter has
 NOTE:
been enabled the long press left will
activate it.
ALADIN SQUARE USER MANUAL
39
2.7.3
Safety stop timer
If a minimum depth of 10m/30ft has
been reached during the dive, at a depth
of 5m/15ft the safety stop timer will start
according to settings either automatically
or you may start this by pressing a button.
If you go below 6.5m/20ft, the timer will
disappear and the no-stop time is shown
again. Upon returning to 5m/15ft, the timer
will start again if set to automatic. As long
as you are shallower than 6.5m/20ft and
there are no decompression obligations,
you can press left button to restart the
countdown manually.
2.7.4
Activating the backlight
To activate the backlight, press left.
The default duration of the backlight is
6 seconds, but you can set a custom
backlight duration time at dive settings.
Read chapter Setting the Backlight on
duration, about how to do this.
NOTE: The backlight is not available
 when
the BATTERY CHANGE
warning appears.
2.7.5
Diving with MB levels
Microbubbles are tiny bubbles that can
build up inside a diver’s body during any
dive and normally dissipate naturally
during an ascent and on the surface after
a dive. Dives within no-stop time and
observance of decompression stops do
not prevent the formation of microbubbles
in the venous blood circulation. Square
has been equipped with an enhanced
UWATEC algorithm, named ZH-L8 ADT
MB, to reduce the formation of these
microbubbles.
40
This enhanced algorithm allows the user
to choose a level of conservatism over and
in addition to the worldwide proven safety
record of the standard ZH-L8 ADT algorithm.
There are five levels of added conservatism
(or MB levels), from L1 to L5, with L5 being
the most conservative and L1 being just a bit
more conservative than the standard ZH-L8
ADT, here referred to as L0.
Choosing a MB level between L1 and L5
makes the algorithm more conservative,
therefore the diver will have either shorter
no-stop times or deeper and longer
decompression stops (referred to as
level stops) than when diving with L0.
Consequently the body will either take up
less nitrogen (shorter no-stop dives) or will
be able to off-gas more before returning to
the surface (dives with level stops). Both
work towards reducing the amount of
microbubbles present in the body at the
end of the dive.
Please refer to chapter Setting the Micro Bubble
level for information on setting the MB level.
2.7.6
Display information
When diving with a MB level other than
L0, Square still carries out all calculations
relating to L0 in the background. To
understand the relation between set MB
level and the underlying L0 calculation and
how the information appears on the display,
we shall use the example of a dive with MB
L3 set in the dive computer.
ALADIN SQUARE USER MANUAL
L0 information in
background
2.7.7
No-stop
No-stop
Display shows L3 no-stop time.
Level stop
No-stop
Display shows L3 level stop information. The white
STOP symbol appears on the display.
Level stop
Decompression
Display shows L3 level stop information. In addition to
the white STOP symbol, also the black DECO symbol
appears to indicate that also L0 is in decompression.
Display of underlying L0
decompression information
During the dive, the information displayed
is always relative to the active MB level.
However, the underlying L0 data is
available as one of the alternate information
fields. When pressing the right button
the appropriate number of times, the L0
information will be visible instead of the
active MB level information for 5 seconds,
after which it is replaced again by the
information relative to the active MB level.
While the L0 information is shown, the
symbol L0 appears in the middle row of
the display. This allows you to be aware of
what the maximum possible no-stop time
is or what the mandatory decompression
requirements are.
2.7.8
Cascading MB levels
When diving with an MB level, Square
carries out all calculations relating to L0 and
to all MB levels in between the currently
active one and L0. This gives the diver the
flexibility to start with a given MB level but
to cascade down to a less conservative
level during the dive: if you start the dive
at L4 but decide not to carry out all the
required L4 stops, you can cascade down
through L3, L2, L1 all the way to L0. Only
decompression stops relating to L0 are
mandatory and must be respected at all
times, whereas the level stops calculated
by the MB levels are recommended but not
mandatory.
2.7.9
Display details
English
L3 information on
display
permanently displayed on the screen. It is
no longer possible to finish the dive with the
MB level set at the beginning of the dive.
When the level stop depth is the same as
the deco stop depth, ascending 1.5m/5ft
above it will cause Square to cascade
down to L0.
At the end of the dive, for five minutes after
reaching the surface, the active (reduced)
MB level is shown on the display. After five
minutes Square changes to surface mode
and switches back to the MB level set prior
to the dive.
2.7.10
PDI Stops
Square is equipped with the innovative
Profile Dependent Intermediate Stops
introduced on other Uwatec dive
computers.
PDI
Stop
optimizes
the
leading
compartment off gassing with a low
gradient at depth which is calculated from
the current profile.
After the dive profile has reached a level
where PDI Stop is recommended the Square
shows symbol PDIS on the bottom row right
followed by the suggested stop depth.
Level stop ignored/MB level
reduced
If a level stop is required and you ascend
1.5m/5ft or more above it, Square will
reduce your active MB level to the next one
compatible with the current depth. When
this happens, the new active MB level is
ALADIN SQUARE USER MANUAL
When ascending to a PDI stop depth the
PDIS symbol starts blinking and 2 minute
down time counter starts running.
41
Once PDIS depth has been reached,
you should stay on the zone that is
-0.5m..+3.0m / -2ft..+10ft from the shown
PDIS depth. If you descend below this zone
the PDIS counter will be deactivated and
Square calculates a new PDIS depth.
WARNING:
Dives in gauge mode are performed at your
own risk. After a dive in gauge mode you must
wait at least 48 hours before diving using a
decompression computer.
When on the surface in gauge mode,
Square will show neither the remaining
desaturation time nor the CNS O2% value.
It will however display a surface interval up
to 24 hours and a 48 hour no-fly time. This
no-fly time is also the time during which you
cannot switch back to computer mode.
WARNING:
The gauge mode surface display after a
dive shows the dive time at the bottom row
left. In the top row right the stopwatch is
running from the dive start or last manual
restart. On the bottom row right the
maximum depth of the dive is shown. After
5 minutes timeout the display changes to
gauge menu mode.
Even when performing a PDI stop, you still
MUST perform a safety stop at 5m/15ft for 3 to
5 minutes. Performing a 3 to 5 minute stop at
5m/15ft at the end of any dive is still the best
thing you can do for yourself!
2.8
Gauge mode
During a dive in gauge mode, Square
displays a dive time in the bottom row left.
The stop counter is shown at the top row
right and it can be reset and restarted by
pressing SEL button.
When Square is set to gauge mode, it will
only monitor depth, time, and temperature,
and will not carry out any decompression
calculations. You can only switch to
gauge mode if the computer is completely
desaturated. All audible and visual warnings
and alarms, other than the low battery
alarm, are turned off.
42
ALADIN SQUARE USER MANUAL
As in SCUBA mode, press right to view
the time of day for 5 seconds in the bottom
row left and other alternative information at
the bottom row. In the display below the
time of the day has been selected (23:43)
combined with average depth (12.8m).
data is saved in 1 second intervals. The
higher amount of saved data requires
more space and the consequence is that
approx 10 hours of log data can be stored
in Apnea mode.
English
While in gauge mode, the average depth
can be reset. To reset the average depth,
press and hold left button.
In Apnea mode it is also possible to start
and stop the dive manually by pressing the
SEL in dive set summary display. This way
you can use the Square for static apnea
dives, where normal dive start depth of 0.8
meters will not start a new dive.
As with gauge mode, Square doesn’t
carry out any decompression calculation.
You can only switch to apnea mode if the
computer is completely desaturated.
Apnea mode at surface after a dive shows
the maximum depth at top row left and the
dive duration at bottom row left.
Alternative info can be selected in the
following order:
The surface interval time is counting at
the top row right for 15 minutes and if no
repetitive dive is done the Square turns to
dive set summary display.
1. Temperature
2. Average depth
3. Max depth
4. Current time of the day at the bottom row
left (replaces the dive time for 5 seconds)
2.9
Apnea mode
Apnea mode during the dive shows at top
row left the current depth, at bottom row
left the time, at bottom row right the HR
and at the middle row right the ascent/
descent speed.
Square has an advanced Apnea diving
mode. The main features include faster
sampling rate than in normal SCUBA mode
and alarm functions tailored to Apnea diving.
Square measures the depth in Apnea
mode every 0.25 seconds to ensure the
precise maximum depth. In logbook the
ALADIN SQUARE USER MANUAL
43
3.
SQUARE
ACCESSORIES
3.1
HR belt
Square receives the signal of the various
low frequency heart rate belts, for example
Polar or Scubapro belts. The position to
wear a HR belt is shown below.
Alternative information can be selected by
pressing right button. The information can
be scrolled in following order:
1. Sequential dive number
Adjust the strap so that it is comfortable to
wear but so that it holds on the place.
When using a diving suit the HR belt must
be directly against the skin.
Moisten the electrode areas if your skin is
dry or when using a dry suit.
2. Heart rate (if activated)
You must enable the heart rate setting on
your Square, refer to chapter Set HR limits
(Workload settings) of how to do this.
After a dive rinse the heart rate belt in fresh
water, dry it and store on a dry place.
With completely sealed HR belts the battery
cannot be changed.
We recommend having the battery change
by authorized SCUBAPRO Uwatec dealer
for the HR belts with a battery cap.
Check the operation conditions and depth
rating of the HR belt from the unit or its
package.
44
ALADIN SQUARE USER MANUAL
SQUARE PC
INTERFACE
4.1
Shark
English
4.
The communication between Square and
PC/Mac is possible only with a Shark.
4. Confirm the connection at Square
by pressing right, the successful
connection is indicated by a light on
the Shark.
5. Select USB device Square
Extras -> Options -> download
The communication between the Square
and the Shark is established via the
contacts on the case bottom. Therefore if
the water contacts or the spring contacts
of the cradle have dirt on the surface, this
should be cleaned with a piece of clothing
before use.
4.2
Introduction to
SCUBAPRO LogTRAK
4.2.1
Download dive profiles
LogTRAK is the software that allows
Square to communicate with a Windowsbased PC or Mac OS.
From LogTRAK, by selecting Dive ->
Download Dives you can transfer the
Square Logbook to your PC or Mac.
In order to take advantage of any of
these features, you need to establish a
communication between your PC and
Square with a cradle.
There are three main views each
showing a specific part of your dive logs:
Profile showing the graphical data of the
dive.
Details about the dive, where you can
edit for example the equipment and tank
information.
Location, which shows your dive site at
the world map.
To start the communication
1. Connect the Shark to your PC
2. Launch LogTRAK on your PC
3. Connect the Shark to your Square
The selection tabs for views are on the top
of the main window.
ALADIN SQUARE USER MANUAL
45
4.2.2
Change warnings/settings
of the Square and reading
computer info
By selecting Extras -> Computer settings
you can enable/disable warnings that cannot
be changed at Square unit via menus.
Read chapter Warnings and alarms
about the possible selections that you can
modify on your Square.
You may also change the shown units
between metric/imperial. Select Extras ->
Options -> measurement units:
46
ALADIN SQUARE USER MANUAL
5.1
TAKING CARE OF
SQUARE
Technical information
Operating altitude:
with decompression – sea level to
approximately 4000m/13300ft
without decompression (gauge mode) –
at any altitude
Max operating depth:
120m/394ft; resolution is 0.1m until
99.9m and 1m at depth deeper than
100m. Resolution in ft is always 1ft.
Accuracy is within 2% ±0.2m/1ft.
Decompression calculation range:
0.8m to 120m / 3ft to 394ft
Clock:
quartz clock, time, date, dive time display
up to 199 minutes
Oxygen concentration:
adjustable between 21% and 100%
Operating temperature:
-10C to +50C / 14F to 122F
Power supply:
CR2450 litium battery
5.2
Maintenance
The depth accuracy should be verified
every two years, that can be done by
authorized SCUBAPRO dealer. Besides
this, Square is virtually maintenance free.
All you need to do is rinse it carefully with
fresh water after each dive and change the
battery when needed. To avoid possible
problems with your Square, the following
recommendations will help assure years of
trouble free service:
- avoid dropping or jarring your Square
- do not expose Square to intense, direct
sunlight
- do not store Square in a sealed container,
always ensure free ventilation
If there are problems with the water
contact, use soapy water to clean Square
and dry it thoroughly. Do not use silicone
grease on the water contacts!
- Do not clean Square with liquids
containing solvents.
- Check the battery capacity before each
dive.
- If the battery warning appears, replace
the battery.
- If any error message appears on the
display, take Square back to an authorized
SCUBAPRO UWATEC dealer.
English
5.
Life of the battery:
About 2 years or 300 dives, which ever
comes first. Actual battery life depends on
the number of dives per year, the length
of each dive, the water temperature, the
usage of backlight and heart rate.
ALADIN SQUARE USER MANUAL
47
5.3
Replacing the battery in
Square
WARNING:
We recommend having the battery of Square
replaced by an authorized SCUBAPRO UWATEC
dealer. The change must be made with particular
care in order to prevent water from seeping in.
The warranty does not cover damages due to an
improper placement of the battery.
Square stores the tissue saturation
information in non-volatile memory, so
the battery can be replaced at any time
between dives without loss of information.

NOTE: - After a dive, Square stores
tissue desaturation data once an
hour while on the surface until it is
completely desaturated. If battery is
changed while Square has remaining
desaturation time, the tissue data
will not be lost, but Square will
reference the last stored data set. As
a consequence, the data displayed on
the surface screen after the battery
change (desaturation time, surface
interval, no-fly time and CNS O2) may
be different from the values displayed
just prior to the battery removal.
5.4
Warranty
Square has a two-year warranty covering
defects in workmanship and functioning.
The warranty only covers dive computers
which have been bought from an
authorized SCUBAPRO dealer. Repairs or
replacements during the warranty period
do not extend the warranty period itself.
Excluded from warranty coverage are faults
or defects due to:
- excessive wear and tear
- exterior influences, e.g. transport
damage, damage due to bumping and
hitting, influences of weather or other
natural phenomena
- servicing, repairs or the opening of the
dive computer by anybody not authorized
to do so by the manufacturer
- pressure tests which do not take place in
water
- diving accidents
- improper placement of the battery cap.
For European Union markets, the warranty
of this product is governed by European
legislation in force in each EU member state.
All warranty claims must be returned with
dated proof-of-purchase to an Authorized
SCUBAPRO Dealer. Visit www.scubapro.com
for the dealer nearest you.
- After replacing the battery, you must set
the date and time.
- There are two O-rings at Square battery
compartment.
- Both O-rings must be replaced each time
when Square is opened.
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ALADIN SQUARE USER MANUAL
GLOSSARY
AVG:
Average depth, calculated from the beginning of the dive or from the
time of reset.
CNS O2:
Central Nervous System oxygen toxicity.
DESAT:
Desaturation time. The time needed for the body to completely eliminate
any nitrogen taken up during diving.
Dive time:
The time spent below a depth of 0.8m/3ft.
Gas 1, gas d
Refers to the main gas (1) and the decompression gas (d) when using
the multi gas option of the ZH-L8 ADT MB PMG algorithm.
Local time:
the time in the local time zone.
Max depth:
Maximum depth attained during the dive.
MB:
Microbubble. Microbubbles are tiny bubbles that can build up in a diver’s
body during and after a dive.
MB level:
One of the six steps, or levels, in SCUBAPRO’s customizable algorithm.
MOD:
Maximum Operating Depth. This is the depth at which the partial pressure
of oxygen (ppO2) reaches the maximum allowed level (ppO2max). Diving
deeper than the MOD will expose the diver to unsafe ppO2 levels.
Multi gas:
Refers to a dive in which more than one breathing gas is used (air and/
or Nitrox).
Nitrox:
A breathing mix made of oxygen and nitrogen, with the oxygen
concentration being 22% or higher. In this manual, air is considered as
a particular type of Nitrox.
NO FLY:
Minimum amount of time the diver should wait before taking a plane.
No-stop time:
This is the time that a diver can stay at the current depth and still make a direct
ascent to the surface without having to perform decompression stops.
O2:
Oxygen.
%O2:
Oxygen concentration used by the computer in all calculations.
PDIS:
Profile Dependent Intermediate Stop is an additional deep stop which
is suggested by Square at depth where 3rd, 4th or 5th compartment
starts off gassing.
PMG
Predictive Multi Gas, refers to the algorithm capable of including up to
two different Nitrox mixes in its decompression calculations.
ppO2:
Partial pressure of oxygen. This is the pressure of the oxygen in the
breathing mix. It is a function of depth and oxygen concentration. A
ppO2 higher than 1.6bar is considered dangerous.
ppO2max:
The maximum allowed value for ppO2. Together with the oxygen
concentration it defines the MOD.
Press:
The act of pressing and releasing one of the buttons.
Press and
hold:
The act of pressing and holding one of the buttons for 1 second before
releasing it.
INT.:
Surface interval, the time from the moment the dive is closed.
ALADIN SQUARE USER MANUAL
English
6.
49
50
SOS mode:
The result of having completed a dive without respecting all mandatory
decompression obligations.
Stopwatch:
A stopwatch, for example to time certain legs of the dive.
Switch depth:
The depth at which the diver plans to switch to a higher oxygen
concentration mix while using the multi gas option in the ZH-L8 ADT
MB PMG algorithm.
UTC:
Universal Time Coordinated, refers to time zone changes when
traveling.
ALADIN SQUARE USER MANUAL
INDEX
Active backlight
Warnings
All-silent mode
Altimeter
Ascent rate
Backlight
Battery
Bookmarks
Buttons
Clock settings
CNS O2
Date
Desaturation
Desaturation reset
Dive planner
Diving at altitude
Flying after diving
Gauge mode
Heart rate monitor
Logbook
Maintenance
MB levels
Microbubbles
MOD
Mountain lakes
No-dive warning
Nitrox
Nitrox reset
No-fly time
Oxygen concentration
Oxygen partial pressure
PC interface
PMG
ppO2max
Safety stop timer
LogTRAK
SOS mode
Stopwatch
Surface interval
Technical information
Time of day
Time zone
Units
UTC
Water contact
Water type
ALADIN SQUARE USER MANUAL
English
7.
13, 17, 29, 40;
34, 46;
17;
9, 30;
36;
13, 17, 29, 40;
7, 13, 38, 48;
29, 39;
6, 28;
15
32, 35, 37, 49;
8, 16;
49
21, 31;
9;
29;
30;
42;
23, 26, 44;
8, 10, 45;
47;
40, 49;
40, 49;
10, 37, 49;
31;
31;
21, 32, 49;
21;
8, 29, 42, 49;
32;
32;
45;
33, 49;
49;
40;
45;
31, 50;
42, 50;
8, 26, 49;
47;
8, 43;
49;
17;
16, 50;
18, 45, 47;
24;
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ALADIN SQUARE USER MANUAL