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against a maximum allowable Nitrogen level. Whichever one is
closest to this maximum level is the controlling compartment for
that Depth. Its resulting value will be displayed numerically along
with the symbols NDC and TIME (Fig. 80a) and graphically as
the Nitrogen Bar Graph (Fig. 80b).
As you ascend from Depth following a dive that has approached
the No Decompression Limit, the Nitrogen Bar Graph segments
will recede as control shifts to slower compartments. This is a
feature of the Decompression Model that is the basis for Multi-
level Diving, one of the most important advantages that Oceanic
dive computers offer.
The ATOM's algorithm is based upon Haldane’s theory using
maximum allowable nitrogen levels developed by Merrill Spen-
cer. 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 (saturation or exposure) during a dive, or
24 hour period, appears graphically as the O2 Bar Graph when
the Alternate #2 (O2) screen is accessed (Fig. 81a). As time
remaining before reaching the Oxygen Exposure Limit decreases,
segments are added to the O2 Bar Graph.
Fig. 81 - O2 Bar Graph
Fig. 80 - Nitrogen Bar Graph
b
a
a
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