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3.31.3 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. For example:
The displayed oxygen exposure calculations are raised to the
•
next higher percentage value.
The CNS% limits up to 1.6 bar (23.2 psi) are based on 1991 NOAA
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Diving Manual limits.
The OTU monitoring is based on the long-term daily tolerance
•
level and the recovery rate is reduced.
Oxygen related information displayed by the dive computer is also
designed to ensure that all warnings and displays occur at the
appropriate phases of a dive. For example, the following
information is provided before and during a dive when the
computer is set in Air/Nitrox or Trimix:
The selected O 2 % (and possible helium %)
•
CNS% and OTU
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Audible notification when CNS% reaches 80%, then notification
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when 100% limit is exceeded
Notifications when OTU reaches 250 and then again when 300
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limit is exceeded
Audible alarm when pO 2 value exceeds the preset limit (pO 2
•
high alarm)
Audible alarm when pO 2 value is < 0.18 (pO 2 low alarm)
•
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