62
As depth increases during a dive, the partial pressure of oxygen
(PO2) increases. When PO2 becomes equal to, or greater than,
1.40 ATA, or 0.2 ATA less than the PO2 Alarm set point (a
user setting);
the red LED will flash, Audible Alarm will sound
(unless set OFF), and the current PO2 value, PO2 symbol, O2 seg-
ment of the O2 Bar Graph, and UP Arrow will appear on the Main
Display as a warning until PO2 decreases. Current Depth and Dive
Time Remaining will also be displayed (Fig. 97).
If PO2 continues to increase, the value displayed will increase to-
ward a maximum value of 5.00 ATA in increments of .01 ATA.
When it reaches a value of
1.60 ATA
,
or the PO2 Alarm set
point (a user setting),
the red LED will flash, the Audible Alarm
will sound (unless set OFF) again, and the current PO2 value, PO2
symbol, O2 segment of the O2 Bar Graph, and UP Arrow will
flash as a warning until PO2 decreases (Fig. 60).
While in High PO2 Mode, the Alternate Displays previously de-
scribed can be accessed using the Advance (Front) button, and the
Backlight can be activated using the Select (Bottom) button.
NOTE: While in High PO2 Mode, the ATMOS ai
will automatically revert to the Main Display after 3
seconds unless the Advance (Front) button is
pressed to view another display of information.
Fig. 59 - PO2 Warning
Fig. 60 - PO2 Alarm
