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USE OF NITROX MIXES WITHIN THE EUROPEAN UNION
Within the European Community the use of Nitrox mixes is regulated by norms EN 13949 and EN 144-3.
OCEAN REEF has designed and manufactured a special regulator line that complies with the aforementioned
regulations. The first and second stage regulators of this line are identified by the marking "Nitrox" and
also feature components colored green to allow an immediate identification.
These regulators can be used with oxygen enriched air containing an oxygen concentration higher than 22%
and up to 100% (pure oxygen), at a maximum operating pressure of 200 bar (2900 psi) or 300 bar (4351 psi)
depending on the version.
As required by European Standards, Nitrox first stage regulator connections have been designed and
approved to be used exclusively with Nitrox cylinders and cylinder valves, in order to prevent confusion
with the corresponding standard-production compressed air regulators. OCEAN REEF Nitrox connections
comply with EN 144-3. In Nitrox first stage regulators, compatibility with high pressure oxygen (higher than
40 bar / 580 psi and up to 200 bar /2900 psi or 300 bar (4351 psi) depending on the version) is ensured
by the choice of special materials used to manufacture seats, O-rings, gaskets and seals used in the high
pressure first stage mechanism valves. Components are lubricated with a specific oxygen lubricant. OCEAN
REEF Nitrox regulators are assembled in a dedicated area in order to comply with the high cleanliness
standards required for oxygen compatibility.
Do not use Nitrox regulators with oxygen enriched air if they have been used with compressed
air. There might be residues of flammable materials that could cause serious accidents.
Do not use silicone grease for the lubrication of Nitrox regulators.
Second stage regulators, pressure gauges, consoles and other accessories used in combination
with Nitrox first stage regulators must also be compatible with the use of Nitrox mixes.
Maintenance on regulators that use Nitrox must be performed every 100 dives or at least
annually.
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Main features of Nitrox dedicated regulators
NEPTUNE III Package Owner's Manual rel. 2.1
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