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to be understated and will affect decompression calculations. If you want to adjust the
computer to provide more conservative calculations, use the personal adjustment
feature to affect decompression calculations, or reduce the PO
2
setting to affect oxygen
exposure according to the entered O
2
% and PO
2
values. Calculations based on nitrox
use result in longer no-decompression times and shallower maximum depths than
diving with air.
As a safety precaution, the oxygen calculations in the computer are made with an
oxygen percentage of 1% + set O
2
% .
When the dive computer is set in NITROX mode, the Dive Planning mode calculates
using the O
2
% and PO
2
values that are currently in the computer.
To set the nitrox mixes, refer to Section 5.8.4. Setting the nitrox values.
Default nitrox settings
In NITROX mode, the Suunto D4 allows you to set a nitrox mix containing 21-50%
oxygen.
In the NITROX mode, the default setting is standard air (21% O
2
). It remains in this
setting until the O
2
% is adjusted to any other percentage of oxygen (22% - 50%). The
default setting for maximum oxygen partial pressure is 1.4 bar, however you are able
to set it in the range of 0.5 - 1.6 bar.
6.2.2. Oxygen displays
When NITROX mode is activated, the display will show the information in the figure
below. In NITROX mode, the maximum operational depth is calculated based on set
O
2
% and PO
2
values.
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