4.11 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 <199:> means remaining time of 199 minutes or
more.
• No-stop time is calculated on line and influenced by the current
workload and current water temperature
If no-stop time drops below 3 minutes, an audible
attention signal is activated and the no-stop value
begins to flash.
If no-stop time is less than 1 minute, the no-stop
display shows the flashing value "0".
In order to prevent a decompression dive, ascend
slowly until the no-stop time is 5 minutes or more.
Dives that require decompression stops are not
recommended.
NO STOP
22
4 Functions during the dive
III UWATEC
®
Smart dive computers
%
NO STOP
%
NO STOP
CNS O
2
%
4 sec
No-stop time
4.10 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 calculated on the basis of the current tank pressure,
breathing rate, the temperature, and the dive data so far recorded. The RBT is
based on the assumption that the tank pressure should amount to the set pres-
sure (default 40 bar/600 psi) at the end of the dive. Alterations can be made with
SmartTRAK. A graphic representation of RBT is on page 15.
During dives with several gas mixtures, the calculation of the RBT is based
on the assumption that the diver will use the
current gas mixture
to finish the
dive.->34, 35
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 func-
tion of the valve is in the open (down) position during the dive.
If the RBT drops below three minutes, an audible
attention signal is activated, the ascent arrow is dis-
played and the tank icon start flashing.
Start ascent immediately.
The RBT value should never reach <0:>. With
RBT=0 the remaining tank reserve may not be suf-
ficient for the ascent.
When the last minute has passed (RBT=0) an audible alarm is activated every
4 seconds. The RBT, the ascent arrow and the tank icon start flashing. The
audible alarm* on exceeding the RBT is suppressed at depths less than 6.5
m (21 ft) if TEC is in the no-stop phase.
Start ascent at once.
*
The audible RBT alarm can be changed to an audible attention signal by
means of SmartTRAK.
%
NO STOP
%
NO STOP
4 sec
4 sec
RBT < 3 minutes
RBT = 0 minutes
WARNING
WARNING
WARNING
WARNING
WARNING
