3. Diving with Galileo
61
English
3.7 Diving with more than
one gas mixture
NOTE:
You must set
PMG
to
ON
for Galileo
to allow diving with more than one gas
mixture. See section 2.3.9 for details
about setting the
PMG
function.
Galileo 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, Galileo will
predict the switch to the higher oxygen
concentration gas(es) at the depth(s)
that you specifi ed and provide you at all
times with a decompression schedule
comprehensive of all 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 Galileo 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 more than one gas mixture
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 more than one gas
mixture, 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 instantly.
- 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.
Galileo enables you to use up to three gas
mixtures during the dive (air and Nitrox only).
The three mixtures are labeled T1, T2 and TD
and must be in ascending order of oxygen
content, i.e. T1 has the lowest oxygen
concentration, T2 an intermediate value, and
TD has the highest oxygen concentration of
the three. Two or more tanks can also be
set to the same oxygen concentration. If you
are diving with only two mixtures, you will be
utilizing tanks T1 and TD.
Galileo can show the tank pressure of
each tank if the corresponding fi rst stage
regulator is equipped with an UWATEC
Smart transmitter, paired as described
in section 1.11. Note that Galileo can be
programmed and used for diving with more
than one gas mixture whether you use
transmitters or not.
3.7.1 Setting
the
oxygen
concentration when diving with
more than one gas mixture
To set the oxygen concentration for tanks
T1, T2 and TD you need to access the
O
2
setting
menu as described in section 2.2.
The look of the menu, however, changes
slightly when
PMG
is set to
ON
in that the
fi rst line now shows the tank designation
and the word
ON
or
OFF
next to it.
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