Specifications

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. Diving Science and Technol-

ogy

(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 Oxy-

gen Accumulation (O2) Bar Graph (Fig. 11a). As time remaining before reaching the oxygen expo-

sure 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 De-

compression 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 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.

Air Time Remaining

The ATMOS

calculates Air Time Remaining using a patented algo-

rithm that is based a diver's individual breathing gas consumption

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 conjunction with a

knowledge of the depth dependence to predict the breathing gas re-

quired for the diver to make a safe controlled ascent including any re-

quired decompression stops.

Fig. 11 - O2 Accumulation

Dive Time Remaining