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ºC
TIME
DIVE
O2%
m
NO DEC TIME
OLF
PO2
BEEP
BEEP
BEEP ...
TIME
MAX
ºC
O2%
m
NO DEC TIME
T
C
B
m
NO DEC TIME
ºC
MAX
DIVE TIME
O2%
OLF
Fig. 3.23. Oxygen
partial pressure and OLF
displays. There is an
audible alarm as oxygen
partial pressure is greater
than 1.4 bar or set value,
and/or the OLF has
reached 80% limit.
Fig. 3.24. Alternative
display. Pressing TIME
button displays current
time, maximum depth,
temperature, CBT and
O
2
%,
Fig. 3.25. The lowest bar
graph blinks to indicate
that the OLF value shown
relates to OTU.
3.4.3. Oxygen Limit Fraction (OLF)
In addition to tracking the diver’s exposure to nitrogen, the instrument tracks the
exposure to oxygen, if set to Nitrox mode. 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%.