19
Fig. 10 - FO2 set for Air
FO2 MODE
After Activation, the VT Pro will operate as an Air computer
without displaying information associated with oxygen calcula-
tions, unless it is set for a percentage of oxygen (FO2) other than
Air (a numerical value between 21 and 50 %).
When set with an
FO2 value of 'Air'
(Fig. 10), the VT Pro will
perform calculations the same as if FO2 were set for 21% oxy-
gen, internally accounting for oxygen loading for any subsequent
Nitrox dives. However, oxygen related displays, warnings, and
the O2 Bar Graph will not appear on the display for that dive, or
subsequent dives, unless FO2 is set for a numerical value (21 -
50).
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 reacti-
vated.
ATR
O
2
Fig. 11 - FO2 set at 21%
ATR
O
2
