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m
O2%
NO DEC TIME
C
B
T
°
C
Fig. 3.25. Alternative display.
Pressing TIME button displays
current time, maximum depth,
temperature, CBT and O
Air Time is less than 30
minutes.
m
AIR TIME
NO DEC TIME
OLF
bar
DIVE TIME
Fig. 3.26. The lowest bar graph
blinks to indicate that the OLF
value shown relates to OTU.
30
3.4.3. OXYGEN LIMIT FRACTION (OLF)
In addition to tracking the diver's exposure to
nitrogen, the instrument tracks the exposure to
MAX
oxygen, if set to Nitrox mode. These calculations are
treated as entirely separate functions.
The dive computer calculates separately for Central
TIME
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%.
%, if
2
The Oxygen Limit Fraction (OLF) has 11 segments,
each representing 10%. The OLF bar graph displays
only the value of the higher of the two calculations.
When the OTU value meets and exceeds the CNS
value then in addition to displaying its percentage
the lowest segment blinks to indicate that the value
shown relates to OTU. The oxygen toxicity
MAX
calculations are based on the factors listed in section
6.3. "Oxygen Exposure".
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