SUUNTO HELO2 - Manual (Page 68)

will cause inert gas percentages to be understated and will affect decompression
calculations. If you want to adjust the computer to provide more conservative calcula-
tions, 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 MIXED GAS mode, the Dive Planning mode calculates
using the O
2
% and PO
2
values that are currently in the computer.
To set the nitrox, trimix and/or heliox mixes, refer to Section 5.8.1. Setting the gases.
Default gas mix settings
In the MIXED GAS mode, the Suunto HelO2 allows you to set 1–8 gas mixes containing
8–99% oxygen and 0–92% helium.
In the MIXED GAS mode, the default setting is standard air (21% O
2
and 0% He). It
remains in this setting until the O
2
% is adjusted to any other percentage of oxygen
(8%–99%). 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 and helium displays
When the MIXED GAS mode is activated, the display will show the information in the
figure below. In the MIXED GAS mode, the maximum operational depth is calculated
based on set O
2
%, He% and PO
2
values.
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