Deep Life Group, including Open Safety Equipment Ltd, use
both Matlab for formal specification and modelling, fitting
well with the use of SPARK Ada and other coding tools.
Matlab operates with unbounded systems, such as those with
analogue sensors, and is easy to follow. For those reasons,
we have chosen Matlab for the specification modelling for
the rebreather development, resulting in the six rebreather
models produced by Open Safety Equipment Ltd (OSEL). All
rebreather code used by OSEL is written in SPARK Ada, a
language used for the most onerous safety applications,
including nuclear reactor control, Heathrow's air traffic
control, the European Fighter Project and others.
The models published below are believed to be the most
detailed available for a rebreather. If there is a material
feature not represented, or a phenomenon not caputured,
please let us know.
User manual for the
Comprehensive Rebreather Model(691KB)
This is the user manual for the Verification model
A quick start guide is also available, from the
Rebreather-World library, written by one of its users:
in 2014 - use the WebArchive on
https://archive.org/web/access to access.
Life's Comprehensive Rebreather Verification Model
Rev 3e: Last update 6/3/2008 (488KB)
This rebreather model is believed to be the most
detailed and exact rebreather verification model in
existence, modelling the environment, the rebreather,
sensors and actuators.
The model is used to validate each part of the design
and its implementation: that is every part of the
design is formally verified.
The model is also used in in accident investigation to
reduce the list of plausible causes left from
filtering the FMECA Vol 6 list faults with the
evidence available. See the Readme file for revision
history, and examples of use.
Reference Verification Model
for Buhlmann ZH-16A Decompression Algorithm with
MatLAB R14 and Simulink code, with documentation and a
GUI, for the Reference Model for the ZH-16A
Decompression Algorithm, with extra compartment for He
(Compartment 1b). These are reference models and should be
used for that purpose only (that is, independent code
To use: Unzip, Start MatLab R14, click on main_RB_TB.m
and run it (F5). You should now see a dive computer
like GUI. Enter a profile using Manual mode or reading
a profile (under Depth), then RUN, PAUSE, change to
Deco (under Depth), RUN to get deco profile. See
graphs under Profile Figure.