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Suunto EON Steel
An increase in partial pressure is indicated by a positive number, and a decrease by a
negative number. The changes in ppN2 and ppHe are displayed next to each gas mixture that
that you want to switch to. Maximum operating depth (MOD) of a breathing gas is the depth at
which the partial pressure of oxygen (pO
pO
limit for the gas.
2
An ICD warning is generated when:
1. Gas switch depth is greater than 10 m (30 ft)
2. Geometric mean of the partial pressure change of N2 and partial pressure change of He is
bigger than 0.35 bar.
If these limits are exceeded with a gas switch, Suunto EON Steel indicates the risk of ICD as
shown below:
In this example, the available gas mixtures for a deep Trimix dive are:
Trimix 15/55, MOD 76.7m (pO
•
Trimix 35/15, MOD 35.7m (pO
•
Trimix 50/10, MOD 22m (pO
•
Oxygen, MOD 6m
•
Suunto EON Steel highlights the dangerous ICD condition when the gas mixture switches
from 15/55 to 35/10 at a depth of 34.7 m.
If this gas switch is made, the change in ppN2 and ppHe are far beyond the safe limits.
One way to avoid the ICD risk is to increase helium content in the 35/10 gas mixture to a
35/25 Trimix mixture. This would keep the changes in partial pressure at a safe level and
remove the danger of sudden ICD.
4.26. Oxygen calculations
During a dive, Suunto EON Steel calculates partial pressure of oxygen (pO
system toxicity (CNS%) and pulmonary oxygen toxicity, tracked by OTU (oxygen toxicity units).
The oxygen calculations are based on currently accepted exposure time limit tables and
principles.
By default in Air/Nitrox dive mode, CNS% and OTU values are not displayed until they reach
80% of their recommended limits. When either value reaches 80%, EON Steel notifies you and
the value stays in the view. In default Trimix mode, CNS% and OTU values are displayed in the
bottom-right corner field as scrollable info.
NOTE: You can customize views to always show CNS% and OTU.
4.27. Personal adjustments
Suunto Fused™ RGBM 2 algorithms provide 5 personal setting options (+2, +1, 0, -1, -2). These
options refer to decompression models. +2 and +1 can be considered conservative, while -2
and -1 can be considered aggressive. 0 is the default setting and is neutral, for ideal
36
) of the gas mix exceeds a safe limit. You can define
2
1.3)
2
1.6)
2
1.6)
2
), central nervous
2
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