Suunto VYTEC DS User Guide

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.

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.

Fig. 3.20. Ceiling and 
Floor Zones. The Recom-
mended and Manadatory 
Safety Stop zone lies 
between 6m and 3m [20 ft 
and 10ft].

Fig. 3.21. Nitrox display. 
Maximum depth based 
on set O2% (21%) and 
PO2 (1.4 bar) is 54.1 m 
[177 ft].