VR Technology Limited
Decompression Algorithms
VR dive computers use a derivative of the Buhlmann ZHL 16 algorithm modified to
assimilate the latest thinking in practical micro-bubble avoidance for enhanced
decompression safety.
The VRx can also be configured to use our new VGM algorithm (see description at
the end of this manual and on our website).
You will note that on all decompression dives, the Buhlmann algorithm will prompt
for deep-water controlling stops of 2 minutes in duration. Deep-water stops are
recognised by their duration (normally two minutes) and a + next to the time. It is
important that these stops are conducted correctly for a safe decompression as they
help to reduce the problems associated with potential micro-bubble growth during an
ascent.
Should a microbubble stop be missed, a “Use tables” message will appear. The
decompression schedule displayed thereafter, although very close to the required
duration, may be in error. If this occurs consult backup tables and add additional stops
or stop time as required. While continued diving with the VR is possible, the
decompression displayed may not be exact. “Use tables” will show for 24 hours.
A major advantage is that after activating the VGM upgrade you still have access to
the original Buhlmann algorithm and can even switch between the two algorithms
from dive to dive if you wish depending on the type of diving you are doing. This is
possible because although the decompression profile on your VR screen reflects only
the selected algorithm, the computer still records tissue and bubble states using both.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
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