Oxygen related information displayed by the dive computer is also designed to ensure that all warnings and displays occur at the appropriate phases of a dive. For example, the following information will be shown before and during a dive when the computer is set in NITROX mode:

the selected O2% on the alternative display

OLF% alternative display for either CNS% or OTU% (whichever is larger)

audible alarms are given and the OLF value starts to blink when the 80% and 100% limits are exceeded

audible alarms are given and the actual PO2 value blinks when it exceeds the preset limit

in dive planning, the maximum depth according to the O2% and maximum PO2 selected

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Suunto D4 manual