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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”.
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