Specifications

66
OXYGEN EXPOSURE
The 500AI is a sophisticated instrument designed with capabilities that go be-
yond the range of recreational diving with compressed air. It will help you to
avoid and manage excessive oxygen exposure.
PARTIAL PRESSURE OF OXYGEN
As depth increases during the dive, the partial pressure of oxygen (PO2) in-
creases. As you approach the maximum depth allowed for the FO2 value set
for the dive, the 500AI will alert you and display the PO2 value while you re-
duce your level of PO2 according to your specialized nitrox training.
High PO2 Dive Mode
The 500AI enters the High PO2 Dive Mode when the partial pressure of oxy-
gen becomes equal to, or greater than, 1.40 ATA. A double beep is emitted
and the current PO2 value and symbol PO2 will appear and remain on display
until the level of PO2 decreases below a value of 1.40 ATA (Fig. 75).
If partial pressure of oxygen continues to increase, the value of PO2 displayed
will increase from 1.40 toward a maximum value of 5.00 ATA in increments of
'.01' ATA.
Fig. 75 - High PO2 Warning
FT
O
2
0
70
140
210
280
350
5000
4000
3000
2000
1000
0