12
VEO 4.0 OPERATING MANUAL
© Pelagic, 2019
Doc. No. 12-5671-r01 (3/20/19)
DTR (DIVE TIME REMAINING)
The Veo 4.0 constantly monitors No Decompression status and O2 Accumulation, and will display whichever time is the least amount available as
DTR on the No Decompression Dive Main screen. The Time being displayed will be identified by the NO DEC min (no decompression time) or O2
min icons.
NO DECOMPRESSION
No Decompression 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 these compartments absorb and release nitrogen is math-
ematically modeled and compared against a maximum allowable nitrogen level.
Whichever compartment is closest to this maximum level is the controlling compartment for that depth. Its resulting value NO DEC min (no decom-
pression time) will be displayed. It will also be displayed graphically as the TLBG Bar Graph, see Bar Graphs below.
As you ascend, the TLBG Bar Graph segments will recede 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 Oceanic dive computers offer.
DTR is
No Decompression
O2 MIN (OXYGEN TIME REMAINING)
When set for nitrox operation, O2 SAT (Oxygen Saturation) during a dive is displayed on an ALT screen as a percentage of allowed saturation
identified by the O2 SAT icon. The limit for O2 SAT (100%) is set at 300 OTU (Oxygen Tolerance Units) per dive or 24 hour period. See the chart at
the back of this manual for specific times and allowances. O2 SAT and O2 min values are inversely related; as the O2 SAT value increases the O2
min value decreases.
When the O2 min value becomes less than the No Decompression calculations for the dive, DTR (Dive Time Remaining) will be controlled by O2 SAT
and the O2 min value will be displayed as the DTR on the Dive Main screen, identified by the O2 min icons.
% O
2
Saturation
DTR is O2 MIN
DIVE ALT 3
DIVE MAIN
BAR GRAPHS
The Veo 4.0 features two specific bar graphs.
1. The one on the left represents nitrogen loading. It is referred to as the TLBG (Tissue Loading Bar Graph).
2. The one on the right represents ascent rate. It is referred to as the VARI Bar Graph.
Ascent Rate
Nitrogen Loading
Summary of Contents for VEO 4.0
Page 6: ...6 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 GETTING STARTED...
Page 11: ...11 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 DIVE FEATURES...
Page 16: ...16 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 DIVE SURFACE MODE...
Page 30: ...30 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 DIVE OPERATION...
Page 40: ...40 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 GAUGE MODE...
Page 44: ...44 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 FREE MODE...
Page 51: ...51 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 REFERENCE...
Page 55: ...55 VEO 4 0 OPERATING MANUAL Pelagic 2019 Doc No 12 5671 r01 3 20 19 TECHNICAL DATA...
