8
Using demand regulators with nitrox mixtures in the EU (European
Union) countries.
Scubatech offers additional models of demand regulators specially produced for use
with nitrox mixtures of oxygen content over 21%, including the use of oxygen. The
above products were tested in accordance with PN-EN 144-3:2005 standards
Respiratory protective devices - Gas cylinder valves - Part 3: Outlet Connections for
diving gases nitrox and oxygen and PN-EN 13949:2005 Respiratory equipment -
Open-circuit self-contained diving apparatus for use with compressed nitrox and
oxygen - Requirements, testing, marking.
Please contact an authorised salesperson of Scubatech products to receive more
information regarding these models.
6. Using in cold water
CAUTION
Cold water diving requires completion of a specialist training carried out by a
qualified instructor.
In accordance with European CEN standardization, the temperature of cold water is
10°C or lower. In such conditions, particularly in fresh water that has higher freezing
point, the risk of freezing of a pressure reducing valve or diving regulator is high. The
usual effects include a constant outflow of breathing gases, and their quicker loss as
a result. The lower the ambient temperature is, the higher the risk of the above
described situation is.
Demand regulators operating at low temperatures must be properly protected.
Isolating a water chamber in a pressure reducing valve from the environment with the
use of an antifreeze agent is the absolute minimum protection required. It is
recommended to use the above system in pressure reducing valves used for diving
at the depth below 30m.
To reduce the risk of freezing of a demand regulator, it is necessary to:
avoid releasing breathing gases on the surface and underwater at the air
temperatures around 0°C and below,
not cause activation of a diving regulator,
avoid simultaneous use of a buoyancy compensator and inflator of a dry suit,
before and during diving stay on the surface as short as possible at the air
temperatures around 0°C and below,
avoid quicker use of breathing gases,
not practice breathing in two persons with the use of a single demand
regulator. Using an additional fully self-contained demand regulator is safer in
emergency situations,
use clean and dry cylinders filled only in places authorized for this purpose.
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