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13
500AI
Oxygen Accumulation Time Remaining
Oxygen accumulation (exposure) during a dive, or 24 hour period, appears
graphically as the O2 Bar Graph (Fig. 13a). As time remaining before reaching
the oxygen exposure limit decreases, segments are added to the O2 bar graph.
When the amount of time remaining before reaching the oxygen limit becomes
less than the No Decompression Dive Time Remaining, calculations for the
dive will be controlled by oxygen. Oxygen Time Remaining will then appear as
the main numeric time display (Fig. 13b) as signified by the O
2
icon appearing
to the right of the display.
As oxygen accumulation continues to increase, the O2 bar graph will enter the
yellow Caution Zone. High O2 Mode is explained in detail later in the Han-
dling the Extremes section.
Breathing Gas Time Remaining
The 500AI calculates Breathing Gas Time Remaining using a patented algo-
rithm that is based on a diver's individual breathing gas consumption rate and
current depth. Tank pressure is measured once each second, and an average
rate of consumption is calculated over a 90 second period. This rate of con-
sumption is then used in conjunction with a knowledge of the depth depen-
dence to predict the breathing gas required for the diver to make a safe con-
trolled ascent including any required decompression stops.
Fig. 13 - O2 Accumulation
Time Remaining
a
b
0
70
140
210
280
350
5000
4000
3000
2000
1000
0
FT
MAX
FT
O
2
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