Technical information

16
4 Functions during the dive
UWATEC
®
Smart dive computers
The prescribed ascent rate must be observed at all times! Exceeding the
prescribed ascent rate can lead to microbubbles in the arterial circulation
which can lead to serious injury or death due to decompression sickness.
In case of an improper ascent Smart may require a decompression stop even
within the no-stop phase because of the danger of microbubbles formation.
The decompression duration necessary for the prevention of microbubbles can
increase massively if the ascent rate is exceeded.
From great depth a slow ascent may cause heightened saturation of tissues
and an extension of both decompression duration and total ascent time.
At shallow depth, a slow ascent may shorten the decompression duration.
Display of the ascent rate has the priority over <CNS O
2
>.
Reduce ascent rate
Excessive ascent rates for longer periods are entered in the logbook.
Ascent rate Visual
alarm
Audible alarm
SPEED
SPEED
SPEED
SPEED
S
L
O
W
S
L
O
W
S
L
O
W
S
L
O
W
%
%
%
%
4.6 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.
The ppO
2 max
can be set by means of SmartTRAK between 1.0 and 1.95 bar. The
set value and the information about the current ppO
2
are not displayed.
The MOD is a function of ppO
2 max
and the mixture used. If during the dive the
MOD is reached or exceeded Smart sends an audible attention message, the
ascent arrow appears and the current depth display starts flashing.
Ascend to a shallower depth in order to diminish the danger of oxygen
poisoning.
The MOD should not be exceeded. Disregarding the warning can lead to
oxygen poisoning.
ppO
2 max
should not be set higher than 1.6 bar
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
CNS O
2
%
NO STOP
%
%
C
4 sec
WARNING
WARNING
WARNING
WARNING