Uwatec Meridian Manual page 39

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• 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
make multi-gas dives prior of making them.
Meridian 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 the
oxygen fraction.
Time
1
Diving with 2 gas mixtures
switching gas mixture during the dive
During the ascent phase, when you reach a
depth corresponding to the MOD of gas d,
Meridian will suggest that you perform the
switch. An audible sequence goes off,
and the text gas d starts flashing on the
display together with the value of the MOD.
You have 30 seconds to respond to this
message, otherwise Meridian will consider
that Gas d will not be used and adapts the
decompression schedule accordingly. To
confirm the gas switch, press seL/esC
button.
SCUBAPRO MERIDIAN
Warning
d
d
Deco mix
Bottom mix
3. Meridian as a dive computer
F
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 for five
seconds without flashing.
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 and holding SEL/ESC button.
Meridian will display the text gas 1 and
its MOD, flashing. At this point press
seL/esC button to confirm the switch.
Meridian will display the text gas 1 for five
seconds without flashing and adapt the
decompression schedule accordingly.
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 Meridian
suggested it, Gas d is excluded from
the decompression calculation and the
decompression schedule is adapted
39