User manual

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ALADIN SQUARE USER MANUAL
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.
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 fi ve 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.