Aeris CompuMask, Operating Manual

Page: 73 / 149

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As you ascend from Depth following a dive that has approached
the No Decompression Limit, the TLBG segments will recede (Fig.
60a) as control shifts to slower compartments. 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 CompuMask's 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. Diving Science and Technology
®
(DSAT), a
corporate affiliate of PADI
®
, commissioned these experiments.
Oxygen Accumulation Time Remaining (OTR)
When the CompuMask is set for Nitrox operation, Oxygen
Accumulation (saturation or exposure) during a dive, or 24 hour
period, appears graphically as the O2 Bar Graph (O2BG) (Fig.
61a). As time remaining before reaching the Oxygen Exposure
Limit decreases, segments are added to the O2BG.
When the amount of time remaining before reaching the Oxy-
gen Limit (OTR) becomes less than the No Decompression Dive
Time Remaining (NDC), calculations for that Depth will be
controlled by Oxygen.
Fig. 61 - O2BG
Fig. 60 - TLBG
a
a