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UP BUTTON TOGGLES BETWEEN PO2, OLF, DIVE TIME AND WATER TEMPERATURE.
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 cal- culations. The oxygen toxicity calculations are based on the factors listed in Sec- tion 10.3. Oxygen exposure .
6.3. Diving in FREE mode (DIVEfree)
If set to FREE mode, the dive computer can be used as a free diving instrument.
In the FREE mode, the total dive time is always displayed in minutes and seconds (mm:ss) in the center window.
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