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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 bars (2900 psi) or 300 bar (4351 psi) depending on the version.
9.1 MainfeaturesofNitroxdedicatedregulators
As required by European Norms, Nitrox rst 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.
SCUBAPRO Nitrox connections comply with EN 144-3.
In Nitrox rst 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 rst stage mechanism valves. Components are lubricated
with a specic oxygen lubricant. SCUBAPRO Nitrox regulators are assembled in a dedicated
area in order to comply with the high cleanliness standards required for oxygen compatibility.
9.2 Useandmaintenancenotes
Nitrox regulators must be used only with oxygen enriched air and only in combination with
compressors and cylinders specically dedicated to the use of Nitrox mixes. Breathable
air (21% oxygen), even if compliant with European Norm EN 12021, can contain a certain
amount of hydrocarbons. These, while not constituting a health hazard, can ignite in the
presence of a high concentration of oxygen.
Should Nitrox regulators be used with compressed air coming from a compressor lubricated
with standard oil they could be contaminated by ammable residues that would make them
dangerous when used again with oxygen enriched air. In case of such a contamination,
before using the regulator again with Nitrox, it will be necessary to disassemble it and
perform an oxygen-specic cleaning in compliance with special procedures (for instance:
CGA G-4.1 protocol or ASTM G93-88 or other ofcially approved procedures) carried out by
a SCUBAPRO certied technician trained in oxygen cleaning and procedures.
1. During routine maintenance procedures it is required to use only genuine SCUBAPRO
components specically approved for the use with oxygen (seats, O-rings and lubricant).
2. After use, rinse thoroughly with fresh water, let dry completely before storing in a dry,
clean, cool place.
3. Never use solvents as they might damage rubber and plastic components.
4. Slowly open the cylinder valve in order to minimize the risk of ignition of the high oxygen
content mix.
5. Components requiring lubrication (O-rings, etc.) must be treated only with suitable
products. In any case never use silicone grease on components used in the high
pressure parts of the regulator, doing so would compromise the compatibility with
Nitrox mixes.
A SCUBAPRO Nitrox EN 144-3 regulator must be overhauled by an authorized SCUBAPRO
technician after every 100 dives or not later than every year, whichever comes rst. The
servicing is compulsory to preserve safety and the limited lifetime warranty also. Please refer
to the Johnson Outdoors warranty conditions.
⚠
WARNING
Do not use Nitrox regulators with oxygen enriched air if they have been used with
compressed air. There might be residues of ammable materials that could cause
serious accidents.
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