Operation Manual

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25
4 Functions during the dive
III UWATEC Aladin TEC 2G
III
4.8 Oxygen toxicity (CNS O
2
%)
Aladin calculates oxygen toxicity based on depth, time and the gas mixture
and displays it in the location of the ascent rate. The toxicity is expressed in
1% increments of a maximum tolerated value (O
2
clock).
The symbol "CNS O
2
" is displayed together with the percentage.
An audible attention signal goes off if oxygen
toxicity reaches 75%. The symbol "CNS O
2
"
flashes.
Ascend to shallower depth to decrease oxygen
loading and consider terminating the dive.
When oxygen toxicity reaches 100%, an audible
alarm goes off every 4 seconds. "CNS O
2
" and
the percentage value flash. Danger of oxygen
toxicity!
Start procedure for terminating the dive.
• During an ascent and if the CNS O
2
% value does not increase anymore (due
to a lower partial pressure of oxygen), the audible warning is suppressed.
• During the ascent, the display of the oxygen toxicity is replaced by the ascent
rate. If the ascent is stopped, the display changes back to the indication of the
CNS value.
• Aladin will display CNS O
2
% values exceeding 199% with 199%.
CNS O
2
%
DEPTH
NO STOP
DIVE TIME

CNS O
2
%
DEPTH
NO STOP
DIVE TIME
4s

CNS O
2
%
DEPTH
NO STOP
DIVE TIME
WARNING
WARNING
Oxygen toxicity
Max Operating Depth MOD
4.7 Partial pressure of oxygen (ppO
2
max ) / Maximum Operating Depth (MOD)
The maximum partial pressure of oxygen ppO
2
max (default 1.4bar) determines
the Maximum Operating Depth (MOD). Diving deeper than the MOD will
expose the diver to oxygen partial pressures higher than the set maximum level.
The ppO
2
max and consequently the MOD can be reduced manually (->20,
setting the gas mixture, point 5).
In addition the maximum allowed ppO
2
can be set by means of SmartTRAK or
with " set 1 " between 1.2 to 1.6bar ->46.
The MOD is a function of ppO
2
max and the mixture used. If during the
dive the MOD is reached or exceeded Aladin sends an audible attention
message and the MOD is displayed (flashing) in the lower left corner.
Ascend to a depth shallower than the displayed MOD in order to diminish the
danger of oxygen poisoning.
The MOD should not be exceeded. Disregarding the warning can lead to
oxygen poisoning.
CNS O
2
%
DEPTH
NO STOP
DIVE TIME
4s
WARNING
WARNING