SUUNTO D9 - Manual (Page 69)

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6.2.2. OXYGEN DISPLAYS
If set to Nitrox mode the D9 will additionally show on the alter-
native display:
•
the oxygen percentage, labeled with O
2
%
•
the set oxygen partial pressure limit, labeled with PO
2
•
the current oxygen toxicity exposure, labeled OLF
6.2.3. OXYGEN LIMIT FRACTION (OLF)
In addition to tracking the diver’s exposure to nitrogen, the
instrument tracks the exposure to oxygen, if set to Nitrox mo-
de. These calculations are treated as entirely separate func-
tions.
The dive computer calculates separately for Central Nervo-
us System oxygen toxicity (CNS) and Pulmonary Oxygen to-
xicity, the latter measured by the addition of Oxygen Toxicity
Units (OTU). Both fractions are scaled so that the maximum
tolerated exposure for each is expressed as 100%.
The Oxygen Limit Fraction (OLF) displays only the value of
the higher of the two calculations. The oxygen toxicity calcu-
lations are based on the factors listed in section 10.3. “Oxy-
gen Exposure”.
Fig. 6.19 Changing gas mix.
Current gas mix is MIX1
(32%). Scroll though enab-
led mixes by pressing UP or
DOWN button. Select new
mix by pressing SELECT
button.
Fig. 6.20 Changing gas mix.
Maximum Operating Depth
exceeded, gas can not be
selected. PO2 value is blin-
king.