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UWATEC Aladin Tec Manual

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23
4 Functions during the dive
III UWATEC
®
Aladin
®
dive computers
III
4.8 Oxygen toxicity (CNS O
2
%)
Aladin
®
calculates oxygen toxicity from depth values, time and the gas mixture
and displays it in place of the ascent rate. The toxicity is expressed in 1% incre-
ments 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 toxi-
city 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
precentage 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
%
CNS O
2
%
DEPTHDEPTH
NO STNO STOPOP
DIVE DIVE TIMETIME
4 sec
S
L
O
W
CNS O
2
%
DEPTHDEPTH
NO STNO STOPOP
DIVE DIVE TIMETIME
WARNING
WARNING
Oxygen toxicity
>Temp., O
2
>Temp. , Time
,
O
2
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 1.4 bar) determines
the Maximum Operating Depth (MOD). Diving deeper than the MOD will expo-
se the diver to oxygen partial pressures higher than the set maximum level.
TEC The ppO
2 max
and consequently the MOD can be reduced manually (->18,
setting the gas mixture, point 5).
TEC In addition the maximum allowed ppO
2
can be set by means of SmartTRAK
or with
"
set 1
"
between 1.2 to 1.6 bar ->40.
The MOD is a function of ppO
2 max
and the mixtu-
re used. If during the dive the MOD is reached or
passed Aladin
®
sends an audible
attention messa-
ge 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
%
DEPTHDEPTH
NO STNO STOPOP
DIVE DIVE TIMETIME
4 sec
WARNING
>Temp. , O
2
>Temp. , Time
>MOD
WARNING
… 23 …


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