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ALADIN SQUARE USER MANUAL
a maximum value of ppO
2
max of 1.6bar.
For oxygen concentrations of 80%
and higher, the ppO
2
max is  xed
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.
2.5.1 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 specifi ed 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 fi nish 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 certi cations to
accomplish multigas dives prior of making them.
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.
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
confi rm the gas switch, press SEL button.
NOTE: Start breathing from the tank
with the new gas mixture before
con rming 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 confi rm the switch, the text gas d
remains on the screen.
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