Seemann XP5, Owner'S Manual, Page: 20 / 108

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As you ascend from depth following a dive that has
approached the no decompression limit, the Nitrogen Bar
Graph will recede as control shifts to slower compart-
ments. This is a feature of the decompression model that is
the basis for multilevel diving, one of the most important
advantages that Aeris dive computers offer.
The no decompression algorithm is based upon Haldane’s
theory using maximum allowable nitrogen levels developed
by Merrill Spencer. Repetitive diving control is based upon
experiments designed and conducted by Dr. Ray Rogers
and Dr. Michael Powell in 1987.
Oxygen Accumulation Time Remaining
Oxygen accumulation (exposure) during a dive, or 24 hour
period, appears graphically as the Oxygen Accumulation
(O2) Bar Graph (Fig. 14a). 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 con-
trolled by oxygen. Oxygen Time Remaining will then ap-
pear as the main numeric time display (Fig. 14b) as signified
by the O2 Time icon appearing on the display. As oxygen
accumulation continues to increase, the O2 Bar Graph will
enter the yellow Caution Zone.
Fig. 14 - O2 Accumulation
Dive Time Remaining
a b