Diver Safety; Oxygen Exposure; Decompression Dives - Suunto EON CORE 2.0 User Manual

Suunto EON Core

3.10.1. Diver safety

Because any decompression model is purely theoretical and does not monitor the actual
body of a diver, no decompression model can guarantee the absence of DCS. Experimentally
it has been shown that the body adapts to decompression to some degree when diving is
constant and frequent. Two personal adjustment settings (P-1 and P-2) are available for divers
who dive constantly and are ready to accept greater personal risk.
CAUTION: Always use the same personal and altitude adjustment settings for the actual
dive and for the planning. Increasing the personal adjustment setting from the planned
setting as well as increasing the altitude adjustment setting can lead to longer
decompression times deeper and thus to larger required gas volume. You can run out of
breathing gas underwater if the personal adjustment setting has been changed after dive
planning.

3.10.2. 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 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 (if helium is activated in use):
The selected O % (and possible helium %)
•
2
CNS% and OTU (visible only after your customization in DM5)
•
Audible notification when CNS% reaches 80%, then notification when 100% limit is
•
exceeded
Notifications when OTU reaches 250 and then again when 300 limit is exceeded
•
Audible alarm when pO
•
Audible alarm when pO
•
WARNING: WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM
LIMIT IS REACHED, YOU MUST IMMEDIATELY TAKE ACTION TO REDUCE OXYGEN
EXPOSURE. Failure to take action to reduce oxygen exposure after a CNS%/OTU warning is
given can rapidly increase the risk of oxygen toxicity, injury, or death.

3.11. Decompression dives

When on a decompression (deco) dive you exceed the no-decompression limit, Suunto EON
Core provides the decompression information required for ascent. Ascent information is
always presented with two values:
Ceiling: depth that you should not go above
•
Asc. time: optimum ascent time in minutes to surface with given gases
•
20
value exceeds the preset limit (pO
2
value is < 0.18 (pO
2 2
high alarm)
2
low alarm)