Page 72
Doc. 13301-Tec-RevB (2022-05-25)
Technical Modes
Operating Instructions
Advanced Config 2
PPO2 Limits
This section allows changing of PPO2 limits�
WARNING
Do not change these values unless
you fully understand the effect�
OC Min.
PPO2
0.18
OC Mod. PPO2 1.40
OC Deco
PPO2
1.61
CC Min.
PPO2 0.40
CC Max.
PPO2 1.60
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Adv. Config 2
All values are in absolute
atmospheres [ATA] of
pressure� (1 ATA = 1�013 bar)
OC Low PPO2
PPO2 of all gases display in
flashing red when less than this
value� (Default 0�18)
OC MOD PPO2
This is the maximum allowable PPO2 during the
bottom phase of the dive -
M
aximum
O
perating
D
epth� (Default 1�4)
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
that is 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�
CC Min PPO2
PPO2 displays in flashing red when less than this
value� (Default 0�40)
CC Max PPO2
PPO2 displays in flashing red when greater than this
value� (Default 1�60)
Note: In both OC and CC modes, “Low PPO2” or
“High PPO2” alerts are displayed when the limits are
violated for more than 30 seconds�
Bottom Gases Vs. Deco Gases
In OC Tec, and 3 GasNx modes, the least oxygen rich
mix is considered a bottom gas and obeys the OC
MOD PPO2 limit� Other gases are considered deco
gases and obey Deco PPO2 limit�
This is another reason it is important to turn off all
gases that you are not carrying�
In Air only and Nitrox modes - not described in this
manual - all gases are considered bottom gases and
obey OC MOD PPO2 limit, even in decompression�