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 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.
22
4 Functions during the dive
UWATEC
®
Smart dive computers
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.
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.
If the RBT drops below three minutes, an audible
attention signal is activated, the ascent arrow is
displayed 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
sufficient 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 flas-
hing.
The audible alarm
on exceeding the RBT is
suppressed at depths less than 6.5 m (21 ft) if
Smart Z is in the no-stop phase.
Start ascent at once.
