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LUNA 2.0 AI USER MANUAL
3 .19 .2 Switching back to a gas mixture with lower oxygen concentration
There may be situations where you have to switch back to a tank with lower oxygen concentration. This can
happen, for instance, if you want to descend again below the MOD of the higher oxygen concentration gas (T2),
or if you have run out of T2 gas during decompression. At this point you can manually initiate the gas switch by
long-pressing the right button.
Long-press the right button to conrm the switch or short -press the right or left buttons to select a different gas
mixture.
3 .19 .3 Gas switch not carried out at the planned depth
If you fail to conrm the gas change within the 30 seconds of when the LUNA 2.0 AI suggests it, the gas is excluded
from the decompression calculation and the decompression schedule is adapted accordingly, basically reecting
the fact that you will nish the dive without using the excluded gas.
3 .19 .4 Delayed gas switch
You can catch up on a planned gas mixture switch at any time by selecting the gas manually. Press-and-hold the
right button to start the gas switch procedure. The LUNA 2.0 AI will display the tank and its oxygen concentration.
This helps you verify that you are performing a switch to a safe gas. At this point you would long-press the right
button to conrm the switch. The LUNA 2.0 AI will display the message GAS CHANGE SAVED and adapt the
decompression schedule accordingly.
3 .19 .5 Submerging below the MOD after a gas switch
If after having switched to gas T2 you inadvertently drop again below the MOD for that mixture, the MOD alarm will
immediately be activated. In this case, you would either switch back to gas T1 or ascend above the MOD for gas
T2.
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