4.10 Decompression information
No-stop time is displayed if no decompression stops are necessary. The arrow
is visible if no
decompression stops are necessary. The figures indicate no-stop time in minutes.
• No-stop display <99:> means remaining time of 99 minutes or
more.
• No-stop time is calculated on line and influenced by the actual
workload and current water temperature.
Messages: There is an acoustic signal if no-stop time
is less than 1 minute. In this last minute, the no-stop
display shows the flashing value <0>.
Response:
In order to prevent a decompression dive, you must
ascend a few metres (feet) after this message.
Do not use the Smart for planned decompression
dives!
NO STOP
18
4 Functions during the Dive
III Uwatec
®
Smart dive computers
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
NO STOP
%
C
DIVE TIME
DEPTH
DECO INFO
MAX.DEPTH
CNS O
2
%
NO STOP
%
%
C
4 sec
No-stop time
4.9
COM
Remaining Bottom Time (RBT)
RBT is the time left at the current depth until the point of time when the ascent
must be started. The RBT is shown in the lower display. The RBT is calculated on
the basis of the current tank pressure, the temperature, and the dive data so far
recorded. The RBT is based on the assumption that the tank pressure should amo-
unt to the set pressure (default 40 bar/560 psi) at the end of the dive. Alterations
can be made with SmartTrak. A graphic representation of RBT is on page 11.
Never allow the RBT to go below three minutes. If the RBT goes below three
minutes there is a danger of insufficient supply of gas mixture for the ascent
as well as an increased risk of decompression sickness and serious injury or
death may result!
Correct calculation of RBT when using a reserve or “J“-type valve is possible
only if the reserve function of the valve is in the open (down) position during
the dive.
Messages: If the RBT drops below three minutes, an
acoustic attention signal is activated, the ascent
arrow is displayed and the tank icon and RBT start
flashing.
Response: Start ascent immediately.
Messages: The RBT-value should never reach <0:>.
With a RBT=0 the remaining tank reserve may not
be guaranteed anymore after ascending. It is possi-
ble that the gas reserve will not be large enough for
the ascent.
When the last minute has passed (RBT=0) an acoustic
alarm is activated every 4 seconds. The RBT, the
ascent arrow and the tank icon start flashing. The
acoustic alarm on exceeding the RBT is suppressed
at depths less than 6.5 m (21 ft) if Smart Com is in
the no-stop phase.
Response:
Start ascent at once
RBT
bar
TANK DATA
RBT
bar
TANK DATA
RBT
bar
4 sec
RBT
≤
3 minutes
RBT = 0 minutes
WARNING
WARNING
WARNING
WARNING
WARNING
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