Design Aeris, Reference Manual

Page: 15 / 40

15
OXYGEN EXPOSURE LIMITS
Predicted exposure limits and oxygen calculations associated with the dive computers' Ni-
trox modes are based on maximum exposure durations published by the NOAA (National
Oceanic and Atmospheric Administration) in the NOAA Diving Manual.
DIVE TIME REMAINING* (DTR)
One of the most important features of AERIS dive computers is the DTR numeric display.
The dive computers constantly monitor no decompression status and oxygen exposure. In-
tegrated models also monitor the rate of air consumption.
The DTR display will indicate the time that is calculated to be more critical for you at that
particular moment (i.e.; whichever time is the least amount available). The specific time
being displayed is identified by an icon or graphic.
No Decompression Time Remaining (NDC)
NDC is the maximum amount of time that you can stay at your present depth before
entering decompression. It is calculated based on the amount of nitrogen absorbed by
hypothetical tissue compartments. The rates each of the compartments absorb and release
nitrogen is mathematically modeled and compared 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 identifying icon
and graphically as the NIBG.
As you ascend from depth following a dive that has approached the no decompression
limit, the NIBG will recede as control shifts to slower compartments.
(continued on page 17)
* This unique feature has been granted U.S. Patent No. 4,586,136.