SUUNTO D9 - Manual (Page 67)

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6.2. DIVING IN NITROX MODE [DIVEEAN]
6.2.1. BEFORE DIVING IN NITROX MODE
If set to the Nitrox mode (DIVEean), the correct oxygen per-
centage of the gas in your cylinder must always be entered in-
to the computer to ensure correct nitrogen and oxygen calcu-
lations. The dive computer adjusts its mathematical nitrogen
and oxygen calculation models. The dive computer will not
accept fractional percentage values of oxygen concentration.
Do not round up fractional percentages. For example, 31.8%
oxygen should be entered as 31%. Rounding up will cause
nitrogen percentages to be understated and will affect decom-
pression calculations. If there is a desire to adjust the compu-
ter to provide more conservative calculations, use the perso-
nal 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 Nit-
rox use result in longer no-decompression times and shallo-
wer maximum depths than diving with air.
As a safety precaution the oxygen calculations in the compu-
ter are made with an oxygen percentage of 1% + setO
2
% .
When the dive computer is set in Nitrox mode also the Dive
Planning mode calculates with the O
2
% and PO
2
values that
Fig. 6.15. Nitrox Dive Mode
Activation. Maximum Ope-
rational Depth based on set
O2% (32%) and PO2 (1.4
bar) is 32.4m].
Fig. 6.16. Diving in Nitrox
mode. Set O2% is 32%.