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A1 USER MANUAL
4.7 Diving with MB-levels
Microbubbles are tiny bubbles that can
build up inside a diver’s body during a dive
and normally dissipate naturally during an
ascent and on the surface after a dive. Dives
within no-stop times or the observance of
decompression stops do not prevent the
formation of microbubbles in the venous
blood circulation.
Dangerous microbubbles are those
migrating into the arterial circulation.
The reasons for the migration from the
venous blood circulation to the arterial
circulation can be because of a build-up
of microbubbles collecting in the lungs.
SCUBAPRO has equipped the A1 with
technology to help protect divers from
these microbubbles.
With the A1 you can choose – according
to your specic needs – a MB-level that
will provide a level of protection from
microbubbles. Diving with MB-levels
includes additional ascent stops which
slow the ascent process, giving the body
more time to desaturate. This works
contrary to the formation of microbubbles
and may increase safety.
The A1 features 6 microbubble levels (L0-
L5). Level L0 corresponds to SCUBAPRO’s
well-known decompression model ZH-
L16 ADT and does not require additional
stops due to microbubble formation.
Levels L1 to L5 offer additional protection
from microbubble formation, with level
L5 offering the highest level and most
protection.
Similar to the display of information during
decompression dives or dives within no-
stop time, the A1 displays the depth and
duration of the rst level stop as well as the
total time of ascent as soon as the MB no-
stop time has run out. As the MB no-stop
time is shorter than the ordinary no-stop
time, you will be required to perform a stop
sooner than a diver using level L0.
If you ignore a required stop, the A1 will
simply step down to a lower MB-level. In
other words, if you choose level L4 prior
to the dive, and during the dive you ignore
the L4’s recommended stops, the A1 will
automatically adjust the setting to level L3
or lower.
Comparison of dives with MB level L0
and level L5
When two A1 dive computers are used
simultaneously, with one unit set to a MB-
level of L5 and the other to a MB-level of
L0, the no-stop time for the L5 unit will be
shortened and more stops will be required
before the L5 diver has the same obligation
of a decompression stop as the L0 diver.
These additional stops help dissipate
microbubbles.
Time
Depth
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