SUUNTO VYTEC - Manual (Page 33)

31
affect oxygen exposure according to the en-
tered O
2
% and PO
2
values. Calculations
based on Nitrox use result in longer no-de-
compression times and shallower maximum
depths than diving with air.
As a safety precaution the oxygen calcula-
tions in the computer are made with an oxy-
gen percentage 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 maximum oxygen par-
tial 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 manu-
ally 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
pressures for MIX2 and MIX3 are stored per-
manently.
3.4.2. Oxygen Displays
If set to Nitrox mode the NITROX display, with
all labeled oxygen information and the label
NITROX, is shown after activation. In Dive
Fig. 3.19. Decompression
dive, above ceiling.
Note downward pointing
arrow, Er warning and
an audible alarm. You
should immediately
(within 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
Recommended 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