Oceanic Dive Computer Pro Plus 2 - Manual (Page 19)

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Fig. 11 - FO2 set for 21%
Once a dive is made with the unit set as a Nitrox Computer
(FO2 set for a numerical value), it cannot be programmed to
operate as an Air Computer until 24 hours after the last dive.
'Air' will not be displayed as an option in the FO2 Mode.
However, you can set FO2 for 21% for use with Air.
When FO2 is set at a value of 21% (Fig. 11), the unit will
remain set at 21% for subsequent nitrox dives until FO2 is
set to a higher value, or until it automatically turns off and is
reactivated.
FO2 50% Default
If the Default function is set to ON (Fig. 12) and FO2
is set to a value 'greater than 21%', the FO2 set point value
will automatically revert to 50% 10 minutes after that dive.
The Maximum Depth that can be achieved with a PO2 of
1.60 ATA will also be displayed.
• FO2 must therefore be reset for each repetitive nitrox
dive, or the value will automatically 'default' to 50(%)
and the dives will be calculated based on 50% O2 (50%
nitrogen) for oxygen calculations and 21% O2 (79%
nitrogen) for nitrogen calculations.
Fig. 12 - FO2 Default ON
MAX
ATR
O 2
N 2
ATR
O 2
N 2