107
- for recreational scuba diving, the recommended upper limit of 1.4 bar PO
2
is
used as a default
- the CNS% limits up to 1.6 bar are based on 1991 NOAA Diving Manual limits
- the OTU monitoring is based on the long-term daily tolerance level and the re-
covery rate is reduced
Oxygen related information displayed by the dive computer is also designed to ensu-
re all warnings and displays in the appropriate phases of a dive. E.g. the following in-
formation will be shown before and during a dive, when the computer is set in Nitrox
mode:
- the selected O
2
% on the alternative display
- OLF% alternative display for either CNS% or OTU% (whichever 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 PO
2
value blinks when it exceeds the
preset limit
- in dive planning the maximum depth according to the O
2
% and maximum PO
2
selected.
