SUUNTO D6 - Manual (Page 69)

6.2.3. Oxygen limit fraction (OLF)
If set to NITROX mode, in addition to tracking the diver's exposure to nitrogen, the
instrument tracks the exposure to oxygen. These calculations are treated as entirely
separate functions.
The dive computer calculates separately for Central Nervous System oxygen toxicity
(CNS) and Pulmonary Oxygen toxicity, 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 calculations are based on the factors listed in Section
9.3 “Oxygen exposure”.
6.2.4. Gas change and multiple breathing gas mixes
One of Suunto D6’s special features is the possibility to set an additional nitrox mix to
be used during a dive. This feature can be activated by setting the MIX2 to ON and
entering other parameters in the same way as with the primary gas. Mix 2 settings
are held until you change them (they will not return to default settings automatically).
A dive is always started with MIX1. During the dive, the Suunto D6 enables you change
to another enabled mix, which is within the set maximum oxygen partial pressure. The
tissue calculation during the dive is based on the mix you have selected.
The Suunto D6 allows gas changes to enabled gas mixes during the dive. Gas changes
are made by following the procedure below:
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