16
4 Functions during the Dive
III Uwatec
®
Smart dive computers
The prescribed ascent rate must be observed at all times! Exceeding the pre-
scribed ascent rate can lead to bubbles in the arterial circulation which can
lead to serious injury or death due to decompression sickness.
• The Smart may require a decompression stop even within the no-stop phase
because of the danger of formation of microbubbles due to an improper
ascent.
• The decompression time 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 time and total ascent time.
At shallow depth, a slow ascent may shorten the decompression time.
• Display of the ascent rate has the priority to <CNS O
2
LIMIT>.
Messages:
Response: Reduce ascent rate
Excessive ascent rates for longer periods are entered in the logbook.
Ascent rate Optical
alarm
Acoustic 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
)
The tolerable partial pressure of oxygen can be set by means of the SmartTrak
software between 1.2 and 1.95 bar (default 1.4 bar). The set value and the
information about the actual ppO
2
are not displayed.
Messages: Depending on the mixture used and the setting of the maximum
partial pressure of oxygen (ppO
2 max
) the limit for an attention
message is reached at different depths. When the set maximum
partial pressure is reached Smart sends an acoustic attention
message, the ascent arrow appears and the current depth dis-
play starts flashing.
Response: Ascend to a shallower depth in order to diminish the danger of
oxygen poisoning.
• The allowed maximum depth 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
WARNING
WARNING
WARNING
WARNING
Eg-SMART III+IV 13.10.2001 11:15 Uhr Seite 16
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