46
M2 USER MANUAL
Setting the gas mixture and the depth
for changing the gas mixture
Range of O
2
fraction
O
2
fraction
100%
21%
• The O
2
concentration of gases can only
be set in ascending order or as equal,
as shown in the picture above.
• The O
2
concentration setting showing
“--“ means that gas is disabled.
• Setting the ppO
2
max value to OFF
applies to Gas 1 only. Gas 2 and d are
always limited to a maximum value of
ppO
2
max of 1.6bar.
• For oxygen concentrations of 80% and
higher, the ppO
2
max is fixed at 1.6bar
and cannot be changed.
• The MOD for Gas 2 and Gas d are the
switch depths for those gases. This is
what the M2 uses for its calculations,
warnings and suggested switch points.
• When diving with more than one gas
mixture, the nitrox reset time function
(described in the section on nitrox reset
time) has the following effect: Gas 1 is set
to 21% Gases 2 and d are set to OFF.
F
NOTE:
Start breathing from the tank
with the new gas mixture before
confirming a switch. Always make
sure you are switching to the intended
gas. Failure to do so may result in
serious injury or death
.
4.9.1
Switching gas mixture during
the dive
During the ascent phase, when you reach
a depth corresponding to the MOD of Gas
d, the M2 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 the M2 will conclude
that Gas d will not be used and adapt
the decompression schedule accordingly.
To confirm the gas switch, press the SEL
button. After you confirm the switch, the
text Gas d remains on the screen for five
seconds without flashing.
4.9.2
Switching back to a gas
mixture with lower oxygen
concentration
There may be situations in which you have to
switch back to Gas 1 or Gas 2 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
Summary of Contents for M2
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