Specifications

FO2 Set for an Air Dive

When set with an FO2 value of 'Air', the 500AI will perform calculations the

same as if FO2 were set for 21% oxygen, internally accounting for oxygen load-

ing for any subsequent Nitrox dives. However, oxygen related displays, warn-

ings, and the O2 Bar Graph will not appear on the display for that dive (Fig.

32), or subsequent dives, unless FO2 is set for a numerical value (21 to 50%).

Setting FO2

To access FO2 Set Mode while in the Surface Mode and set the unit for Air or

the percentage (%) of oxygen (FO2) in your nitrox mix:

• press the Advance (Left) button 2 times

• press the Select (Right) button repeatedly, or press and hold it, until the

value of FO2 for the nitrox mix being used is displayed

• the FO2 value displayed (Fig. 33a) will advance from 21 to 50 (%) in in-

crements of 1 (%), then display 'Air' again.

• the Maximum Depth that can be achieved with an oxygen partial pres-

sure (PO2) of 1.60 ATA will be displayed (Fig. 33b) for each FO2 value.

No PO2 value will appear for Air.

The unit reverts to Surface Mode after 2 minutes, unless the Advance (Left)

button is pressed to access the Plan Mode.

Fig. 32 - Dive Mode

(FO2 Set for Air)

Fig. 33 - Setting FO2

140

210

280

350

5000

4000

3000

2000

1000

MAX