EQUIPMENT: Is the Future of Semi Closed Rebreather Diving Here?
How does it work?
The compact and sleek unit uses 2 x 2litre cylinders to provide you with up to 2.5hours of dive time. When fully loaded with gas and scrubber material, the Submatix 100ST weighs only 15kg.
The fully mechanical Submatix requires very little set up time and has very few parts to fail. The unit is what is known as a Constant Mass Flow Semi Closed Rebreather. This means that it uses a carefully manufactured flow reducer to accurately deliver gas at a predetermined flow rate regardless of depth.
This simple device means that gas planning couldn’t be easier allowing you to plan your dive time with ultimate precision.
Various flow reducers are available offering the user ultimate flexibility of depth and the gas used.
The gas used in the Submatix is premixed Nitrox. The 2 x 2litre cylinders are filled with nitrox of a predetermined mix suitable for the dive. This gas is then delivered at just the right rate to enable you to dive for extended periods without the risk of receiving too much or too little oxygen.
This is achieved by taking the exhaled air from the diver and passing it though the scrubber filled with a granular carbon dioxide absorbent material that removes the carbon dioxide. This ‘cleansed’ air then has nitrox added before being inhaled by the diver.
Not only is this a very efficient use of gas but the carbon dioxide absorbtion process actually produces heat and moisture meaning that the gas you breath in is warm and moist – a far cry from the dry cold air that open circuit divers are used to.
This mechanical process does not rely on computers or manual intervention – simply set the unit up before you enter the water and then enjoy your diving. Basic monitoring of cylinder pressure throughout the dive is all that is required – no different to diving open circuit.
the unit right for me?
Example – A diver diving
a single 12ltr cylinder to 30m using air, with a breathing rate of 20lpm.
The same dive on the Submatix 100ST using 40% Nitrox would give the user a total dive time available of 64mins (allowing a 9.4lpm flow)
To achieve the same dive time on Open Circuit would require a set of twin 15ltr cylinders weighing around 35kgs!
More than double the weight and size of the Submatix 100ST.
training do I need?
TDI – Technical Diving International
All courses are recognised by BSAC and SAA so the unit is suitable for branch diving activities. A unit cannot be purchased without appropriate and approved training from a recognised training agency.
Call the Abyss (UK) Diving Ltd offices for details of courses and to find your local instructor.
new with the Submatix?
The Submatix 100ST features many patented parts and research and development continues. The unit itself is upgradeable to develop with your experience. Call the Abyss (UK) Diving Ltd office for full details or speak with your instructor as to how the unit can be upgraded.
Core to the Submatix development has been efficiency and ease of use
in a compact user friendly unit.
Real Time PPO2 Monitoring with the OxyScan
Safe rebreather diving relies on knowing what you are
breathing. With Semi Closed Rebreathers this is achieved by using a PPO2
monitor placed in the inhale side of the breathing loop. The O2 cell reads
the PPO2 of the gas in the bag and displays a clear reading on a digital
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