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The no decompression algorithm is based upon Haldanes theory using maximum allowable nitro-
gen levels developed by Merrill Spencer. Repetitive diving control is based upon experiments de-
signed and conducted by Dr. Ray Rogers and Dr. Michael Powell in 1987. Diving Science and
Technology
®
(DSAT), a corporate affiliate of PADI
®
, commissioned these experiments.
Oxygen Accumulation Time Remaining
Oxygen accumulation (exposure) during a dive, or 24 hour period, appears graphically as the
Oxygen Accumulation (O2) Bar Graph (Fig. 11a). 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 that depth will be controlled by oxygen.
Oxygen Time Remaining will then appear as the main numeric time display (Fig. 11b) as signi-
fied by the O2 Time icon appearing on the display. As oxygen accumulation continues to in-
crease, the O2 Bar Graph will enter the yellow Caution Zone.
Air Time Remaining
The
ATMOS ai
calculates Air Time Remaining using a patented al-
gorithm that is based a diver's individual breathing gas consump-
tion rate and current depth. Tank Pressure is measured once each
second and an average rate of consumption is calculated over a 60
second period. This Rate of Consumption is then used in conjunc-
tion with a knowledge of the depth dependence to predict the
breathing gas required for the diver to make a safe controlled as-
cent including any required decompression stops.
Fig. 11 - O2 Accumulation
Dive Time Remaining
a
b
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