SUUNTO VYTEC - Manual (Page 35)

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After five seconds the display will automati-
cally revert to the original display.
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 calcu-
lations are treated as entirely separate func-
tions.
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 ex-
posure for each is expressed as 100%.
The Oxygen Limit Fraction (OLF) has 11 seg-
ments, 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 calculations are based on the factors
listed in section 6.3. “Oxygen Exposure”.
3.4.4. Gas Change, Multiple
Breathing Gas Mixes
The Vytec has as a special feature the possi-
bility to set two additional nitrox mixes to be
used during the dive. This feature can be acti-
vated by setting the MIX2 and/or MIX3 “ON”
and entering other parameters in the same
way as on the primary gas (See chapter
4.3.1.4 Nitrox/Oxygen settings). Mix 2 and 3
settings are held until you change them (they
will not return to default settings automatical-
ly). Cylinder pressure data is available for one
wireless transmitter only. A dive is always
started with MIX1, during the dive the Vytec
lets you change to any enabled mix, which is
Fig. 3.26. The lowest bar
graph blinks to indicate
that the OLF value
shown relates to OTU.
Fig. 3.27 Changing gas
mix. Current gas mix is
MIX1 (21%). Scroll though
enabled mixes by pressing
PLAN or TIME button.
Select new mix by pressing
MODE (OK) button.
NO DEC TIME
MAX
DIVE TIME
OLF
bar
AIR TIME
m
PO2
O2%
OK
m
° C TIME
O2%
m
NO DEC TIME
MAX
T
C
B
Fig. 3.25. Alternative
display. Pressing TIME
button displays current
time, maximum depth,
temperature, CBT and
O2%, if Air Time is less
than 30 minutes.