Specifications

Breathing gas consumption and depth are continuously monitored, and

Breathing Gas Time Remaining reflects any change in your circumstances.

For example, when a buddy starts breathing from your octopus or you sud-

denly find yourself swimming against a strong current and begin breathing

more rapidly, the 500AI will recognize this change and adjust your Breathing

Gas Time Remaining accordingly.

Remember, the Breathing Gas Time Remaining is the time you can remain at

the present depth and still safely surface with the tank pressure reserve that

you select during setup (End Gas Alarm Set Point).

When Gas Time Remaining indicates zero (Fig. 14a), you should immediately

initiate a controlled ascent while monitoring your tank pressure (Fig. 14b).

However, there is no reason to panic, the 500AI has allowed for the breathing

gas necessary for a safe ascent including any emergency decompression stops

required.

For example:

• You set the End Gas Alarm for 300 PSI (20 BAR)

• You are at a depth of 60 feet (20 meters)

• Gas Time Remaining decreases to 0:00

• You ascend at a maximum rate of 60 fpm (20 mpm)

• You surface with 300 PSI (20 BAR) pressure remaining in your tank

Fig. 14 - Breathing Gas

Time Remaining

140

210

280

350

5000

4000

3000

2000

1000