SUUNTO VYTEC DS - Manual (Page 33)

31
on Nitrox use result in longer no-decompression
times and shallower maximum depths than div-
ing with air.
As a safety precaution the oxygen calculations
in the computer are made with an oxygen per-
centage of 1% + setO
2
% .
When the dive computer is set in Nitrox mode
the Dive Planning and Dive Simulation modes
both calculate with the O
2
% and PO
2
values
that are currently in the computer.
To set the Nitrox mixes refer to chapter 4.3 Set
Modes.
DEFAULT NITROX SETTINGS
In Nitrox mode the Vytec allows the user to set
1-3 nitrox mixes containing 21-99% oxygen.
In the Nitrox mode, the default setting for MIX1
is standard air (21% O
2
). It remains in this setting
until the O
2
% is adjusted to any other percentage of
oxygen (22% - 100%). The default setting for maxi-
mum oxygen partial pressure is 1.4 bar, however
you are able to set it in the range of 0.5 - 1.6 bar.
If unused, the computer will retain the manually
entered values for the oxygen percentage and
maximum oxygen partial pressure for MIX1 for
about two hours, after which it will revert to the
default settings.
MIX2 and MIX3 are by default set to OFF. To
set MIX2 and MIX 3 refer to chapter 3.4.4 Gas
change and multiple breathing mixes. Oxygen
percentages and maximum oxygen partial pres-
sures for MIX2 and MIX3 are stored permanent-
ly. If MIX2 and MIX3 are set OFF, the computer
will retain the manually entered values for the
oxygen percentage and maximum oxygen par-
tial pressure for MIX1 for about two hours, after
which it will revert to the default settings.
3.4.2. Oxygen Displays
If set to Nitrox mode the NITROX display,
with all labeled oxygen information and the
Fig. 3.19. Decompression
dive, above ceiling.
Note downward pointing
arrow, Er warning and
an audible alarm. You
should immediately (with-
in 3 minutes) descend to
or below ceiling.
DIVE TIME T
C
B
m
STOP
CEILING
ASC TIME
AIR TIME
bar
Fig. 3.20. Ceiling and
Floor Zones. The Recom-
mended and Manadatory
Safety Stop zone lies
between 6m and 3m [20 ft
and 10ft].
3m / 10ft
6m / 18ft
CEILING
FLOOR
Fig. 3.21. Nitrox display.
Maximum depth based
on set O2% (21%) and
PO2 (1.4 bar) is 54.1 m
[177 ft].
PO2
O2%
OLF
m