23
VT 4.0 OPERATING MANUAL
© 2002 Design, 2011
Doc. No. 12-5213-r02 (9/6/11)
Air Time Remaining (ATR)
ATR is
calculated 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 the Depth to predict the Air required for the diver to make a safe controlled Ascent
including the No Deco Deep and Safety Stops and any required Deco Stops.
Air Consumption and Depth are continuously monitored and ATR reflects any change in circumstances. For example, when you
suddenly find yourself swimming against a strong current and begin breathing more rapidly, the VT 4.0 will recognize the change
and adjust ATR accordingly.
ATR is the time you can remain at the present Depth and still safely surface with the Tank Pressure reserve that you selected during
setup (End Pressure Alarm Setting).
ATR is displayed on the Dive Main screens (Fig. 42a).
ATR Alarm
When ATR decreases to 5 minutes, the Audible will sound and the ATR time digits and graphic AIR TIME will flash (Fig. 43). If it
decreases to 0, the Audible will sound again. The time digits and graphic will continue to flash until ATR becomes greater than 5
minutes.
You should initiate a controlled Ascent while monitoring Tank Pressure. However, there is no reason to panic, the VT 4.0 has
allowed for the Air necessary for a safe Ascent including the No Deco Deep and Safety Stops, if set On, and any Deco Stops
required.
a
Fig. 42 - NO DECO MAIN
Fig. 43 - NO DECO MAIN
(during ATR Alarm)
NORM DIVE MODE STRUCTURE
DIVE
MAIN
M
S
A
2 sec
2 sec
< 2 sec
< 2 sec
GAS/TMT
Switch
Compass Op Main
Light (Smartglo)
60 sec
2 sec
DS Preview
Safety Stop
Main
Deep Stop
Main
A
< 2 sec
ALTs
A
< 2 sec
ALTs
ALTs
at 5 FT (1.5 M) for 5 sec
at 2 FT (0.6 M) for 1 sec
Surface.Mode
Dive.Mode
> GAS 1 Air
GAS 2 32%
GAS 3 21%
GAS 4 80%
Switch/
Confirm
A
< 2 sec
at 1/2 Max
Depth for 2 min
at Depth/Time
set, or Timer
Start/Stop Timer
M
< 2 sec
Reset Timer
A
2 sec
S
< 2 sec
Summary of Contents for VT 4.0
Page 4: ...4 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 FEATURES FUNCTIONS...
Page 10: ...10 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 NORM SURFACE MODES...
Page 19: ...19 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 DIVE MODE FEATURES...
Page 24: ...24 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 NORM DIVE MODES...
Page 31: ...31 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 GAS TMT SWITCHING...
Page 34: ...34 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 GAUG OP MODE...
Page 39: ...39 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 FREE DIVE OP MODE...
Page 44: ...44 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 COMPASS MODE...
Page 55: ...55 VT 4 0 OPERATING MANUAL 2002 Design 2011 Doc No 12 5213 r02 9 6 11 TECHNICAL DATA...
