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24
5 Functions at the surface
UWATEC
®
Smart dive computers
5.1 End of a dive
After reaching the surface (<0.8 m/3 ft) Smart Z remains in dive mode for 5
minutes. The delay allows for surfacing for a short period for orientation.
After 5 minutes the dive is closed and it is entered into the logbook.
For the calculations of the desaturation and no-fly time it is assumed that the
diver breathes air while on the surface.
5.2 Desaturation time
After the dive has been closed
DESAT
, desaturation time in hours and
minutes and, if available, oxygen toxicity is displayed. Desaturation time is
determined either by oxygen toxicity, nitrogen saturation or the regression of
microbubbles, depending on which requires the longer time. Oxygen toxicity
("CNS O
2
") is displayed and adjusted until the value becomes 0%.
Desaturation time is indicated until the next dive or until it reaches zero.
The display is switched off to save energy three minutes after the last manipula-
tion is made. The calculations are nevertheless continued in the background.
5.3 No-fly time
The "no-fly time" is indicated beside the icon "do not fly". "No-fly time" is the
time in hours that should pass before a flight and is displayed and adjusted until
the value becomes 0 hours.
Flying while Smart Z displays "do not fly" may
lead to serious injury or death from decompression
sickness.
%
CNS O
2
%
NO
CNS O
2
%
NO
Desaturation time
Oxygen toxicity
Do not fly icon
No-fly time
5.4 Microbubble warning
Through repetitive dives microbubbles accumulate in the lungs if the surface
interval is not long enough. Ignoring decompression stops or ascending at an
excessive rate can also lead to microbubbles in tissues. In order to reduce the
risk of decompression sickness for repetitive dives, the surface interval should
be planned long enough. If Smart Z calculates that the formation of micro
-
bubbles occurs during the surface interval, it will advise a diver to extend the
surface interval via the microbubble warning. The duration of the microbubble
warning is visible by entering the dive planner -> 33.
If the "microbubble warning (NO DIVE)" is visible
during the surface interval, the diver should not
undertake another dive.
If the dive is made in spite of the microbubble warning, the diver must cope
with a clearly shorter no-stop time or an extension of decompression. Also,
the duration of the microbubble warning at the end of the dive can increase
considerably.
CNS O
2
%
NO
NO
Microbubble
warning
Desaturation time
WARNING
WARNING
WARNING
104


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