SUUNTO Vyper - Manual (Page 68)

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6.3. OXYGEN EXPOSURE
The oxygen exposure calculations are based on currently accepted exposure time
limit tables and principles. In addition to this the dive computer uses several
methods to conservatively estimate the oxygen exposure. These include for
example:
• the displayed oxygen exposure calculations are rounded to the next
higher whole percentage value
• for recreational scuba diving, the recommended upper limit of 1.4 bar
PO
2
is used as a default
• the CNS% limits up to 1.4 bar are based on 1991 NOAA Diving Man-
ual limits, but the limits higher than 1.4 bar are signifi cantly shortened.
Thus, if through carelessness or emergency you exceed the 1.4 bar PO
2
limit, the dive computer will still continue to calculate and show OLF%
information
• the uptake and recovery for both CNS% and OTU% are monitored
• the OTU monitoring is based on the long-term daily tolerance level and
the recovery rate is reduced
• the half time limit for the CNS recovery is 75 minutes
• the maximum depth warning limit based on 1.4 bar PO
2
is calculated
and displayed. If extra conservatism for the depth limits is required the
PO
2
can be adjusted to 1.2 or 1.3 bar.
Oxygen related information displayed by the dive computer is also designed to
ensure all warnings and displays in the appropriate phases of a dive. E.g. the fol-
lowing information will be shown before and during a dive:
• the adjusted O
2
%
• the color-coded OLF% bar graph for both CNS% and OTU% monitor-
ing
• audible alarms are given and the OLF bar graph starts to blink when the
80% and 100% limits are exceeded
• the blinking of the bar graph stops, when the PO
2
is below 0.5 bar
• the PO
2
is shown when it is greater than the preset limit.