17
4 Functions during the Dive
III Uwatec
®
Smart dive computers
English
III
4.7 Oxygen toxicity (CNS O
2
%)
Oxygen toxicity is calculated from depth values, time and the gas mixture by the
calculation model and displayed in place of the ascent rate in percent of a maxi-
mum value tolerated (O
2
clock). The toxicity is expressed in 1%-increments.
Together with the percentage the symbol <CNS O
2
LIMIT> is displayed.
Messages: An acoustic signal is sent if oxygen toxi-
city reaches 75%. The symbol <CNS O
2
LIMIT> is
flashing and the ascent arrow appears.
Response: Ascend to shallower depth to decrease oxygen
loading.
Messages: When oxygen toxicity reaches 100%, an
acoustic alarm is sent every 4 seconds. <CNS O
2
LIMIT>, the precentage value and the ascent arrow
are flashing.
Danger of oxygen toxicity!
Response: Start ascent at once.
• During an ascent and if the CNS O
2
% value does not increase anymore (due
to a lower partial pressure of oxygen), the acoustic warning is suppressed.
• During the ascent, the display of the oxygen toxicity extinguishes and the
ascent rate is displayed. If the ascent is stopped, the display changes back to
the indication of the CNS value.
4.8
COM
Tank pressure
Tank pressure is indicated in the lower display.
The tank pressure is also used for the calculation of the remai-
ning bottom time (RBT) and the workload.
Messages: If the tank pressure falls short of the set
alarm pressure (SmartTrak) an acoustic alarm is sent
and the tank symbol is shown.
Default value of the alarm pressure: 100 bar (1400
psi)
Response: Start ascent at once.
Messages: In case of increased workload, the Smart
Com displays a lung symbol in the lower display and
an acoustic warning occurs.
Response: In order to prevent additional saturation, reduce
exertion, relax and breathe more slowly.
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
CNS O
2
%
NO STOP
%
%
C
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
CNS O
2
%
NO STOP
%
%
C
4 sec
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
NO
CNS O
2
%
NO STOP
%
%
C
Oxygen toxicity
TANK DATA
bar
TANK DATA
RBT
bar
4 sec
TANK DATA
4 sec
WARNING
WARNING
WARNING
WARNING
Eg-SMART III+IV 13.10.2001 11:16 Uhr Seite 17
