80
Oxygen Accumulation Time Remaining (OTR)
When the VT3 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. 64a).
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 becomes less than the No Decompression Dive Time
Remaining, calculations for that Depth will be controlled by
Oxygen. Oxygen Time Remaining (OTR) will then appear as the
Dive Time Remaining (DTR) display (Fig. 64b) as signified by the
symbols TIME and O2. As Oxygen Accumulation continues to
increase, segments will add to the O2BG.
Air Time Remaining (ATR)
The VT3
calculates Air Time Remaining (ATR) using a patented
algorithm that is based on a diver's individual Air Consumption
Rate and Current Depth.
> Tank Pressure is measured once each second and an
average rate of Consumption is calculated over a 90
second period.
> This Rate of Consumption is then used in conjunction with a
knowledge of the Depth dependence to predict the Air
required for the diver to make a safe controlled Ascent
including any required Decompression Stops.
b
Fig. 64 - O2 Time Remaining
a
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