Operating Instructions
Page 52
Doc. 15301-RevB (2023-11-24)
PPO2 Limits
This section allows changing of PPO2 limits�
All values are in absolute atmospheres [ATA] of
pressure� (1 ATA = 1�013 Bar)
Bottom gas vs deco gas assumptions
When not in deco:
The least oxygen rich mix that is turned on and all
mixes with 40% O2 or less are assumed to be bottom
gases� All other gases are assumed to be deco gases�
When in deco:
Only the least oxygen rich mix is assumed to be a
bottom gas� All other gases are assumed to be deco
gases�
OC Low PPO2
For all gases, PPO2 and the active gas display will
flash red when the active gas is less than this value�
(Default 0�18)
OC MOD PPO2
This is the maximum allowable PPO2 during the
bottom phase of the dive - Maximum Operating
Depth� (Default 1�4)
For all bottom gases, PPO2 will turn yellow when
within 0�03 of OC MOD PPO2�
Also for all bottom gases, PPO2 and the active gas
display will flash red when PPO2 is more than 0�03
greater than OC MOD PPO2�
MODs of bottom gases are determined with this value�
OC Deco PPO2
All decompression predictions (Deco schedule and
TTS) assume that the gas used for decompression at
a given depth will be the gas with the highest PPO2
less than or equal to this value� (Default 1�61)
Suggested gas switches (when the current gas is
displayed in yellow) are determined by this value� If
you change this value, please be sure you understand
its effect�
For example, if lowered to 1�50, then a switch to
oxygen (99/00) will not be assumed at 6m/20ft�
PPO2 of all deco gases display in yellow when within
0�03 of OC DECO PPO2�
For all OC deco gases, PPO2 and the active gas flash
red when PPO2 is more than 0�03 greater than OC
DECO PPO2�
MODs of deco gases are determined with this value�
Reset Limits
Resets all PPO2 limits for this dive mode back to
defaults�
Note: A “Low PPO2” or “High PPO2” alert is displayed
when the limits are violated for more than 30 seconds�
WARNING
Do not change these values unless
you fully understand the effect�
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