After five seconds the display will automatically 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 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 mea- sured by the addition of Oxygen Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure for each is ex- pressed 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 ad- dition 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 possibil- ity to set two additional nitrox mixes to be used during the dive. This feature can be activated 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 automatically). Cyl- inder pressure data is available for one wire- less transmitter only. A dive is always started with MIX1, during the dive the Vytec lets you change to any enabled mix, which is within the
m
| MAX |
O2% |
|
| NO DEC TIME |
C |
|
B |
|
T °C | TIME |
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.
| m |
| MAX |
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.
m
PO2
O2%
OK
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.
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