Apeks NS158000, Owner'S Manual, Page: 15 / 96

DIVE FEATURES
Doc. 12-7969 Doc. 12-7969 r09 (9/22/22)
15
© Apeks (2022)
DTR (DIVE TIME REMAINING)
The DSX 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 DECO (no decompression) or O2 TIME icons.
NO DECOMPRESSION
No Decompression is the maximum amount of time that you can stay at your present depth before entering de-
compression. 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 mathematically 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 result-
ing value NO DECO (no decompression) will be displayed. It will also be displayed graphically as the N2 or GF
Bar Graph, see Bar Graphs later in this section.
As you ascend, the N2 Bar Graph 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 Apeks dive
computers offer.
O2 TIME (OXYGEN TIME REMAINING)
When set for nitrox operation, O2 SAT (Oxygen Saturation) during a dive is displayed on the More Dive Data
screen as a percentage of allowed saturation identified by the O2 SAT graphic. 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 TIME values are inversely related; as the O2 SAT value increases
the O2 TIME value decreases.
When the O2 TIME value becomes less than the No Decompression calculations for the dive, DTR (Dive Time
Remaining) will be controlled by O2 SAT and the O2 TIME value will be displayed as the DTR on the Dive Main
screen, identified by the O2 TIME icon.
DTR is
No Decompression
AR
DEPTH DIVE TIME
PO2
1.30
14%
85.
9
M
0:23
NO DECO
0:34
T
0:0
TS
7
FiO2
1.99
Dil PO2
GF
MAX DEPTH
AVG DEPTH
TEMPERATURE
PO2
MOD
O2 SAT
NITROX MODE
MORE DIVE DATA
89 M
47 M
24 °C
1.11
100 M
24 %
O2 Saturation
during a nitrox
dive