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SETTING FO2 FOR NITROX DIVES
• For each value of FO2, the MOD (Max Operating Depth) that can be achieved for
the PO2 Alarm limit previously set will be displayed.
• When the FO2 50% Default is set On and FO2 Gas 1 is set for a numerical value, 10
minutes on the surface after that dive, the FO2 for Gas 1 will be displayed as 50 and
further dives will be calculated based on 50% O2 for oxygen calculations and 21%
O2 for Nitrogen calculations (79% Nitrogen) unless the FO2 for Gas 1 is set before
the dive.
• FO2 for Gas 1 continues to reset to the FO2 50% Default after subsequent repetitive
dives until 24 hours elapse after the last dive, or the FO2 50% Default is turned Off.
• When the FO2 50% Default is set Off, the FO2 for Gas 1 will remain at the last Set
Point for the remainder of that series of repetitive dives.
• The default FO2 for Gas 1 each new dive period is Air.
• When FO2 for Gas 1 is set for AIR, the calculations are the same as when it is set to
an FO2 of 21%. When FO2 for Gas 1 is set to Air, it remains set for Air until it is set
for a numerical FO2 value (21 to 50%).
• When FO2 is set only to Air, the O2BG and PO2 values and/or warnings will not be
displayed during the dive.
• MODs affected by the PO2 limit set will not be displayed when FO2 for Gas 1 is set
to Air.
• The Element II keeps track of O2 so that if FO2 for Gas 1 is subsequently set for a
numerical value, the O2 accumulated during previous Air dives will be accounted for
in the next Nitrox dive (during that dive period and series of repetitive dives).
• Once FO2 Gas 1 is set for a numerical value (21 to 50%) and a dive is made, the
Air option is disabled until 24 hours elapse after the last dive. The Air option will not
be displayed in Set FO2 Gas 1 until a full 24 hour Surface Interval has elapsed.
