North FRONTIER Series, Инструкция пользователя

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2.2 COMPACT DEMAND VALVE (CDV)
The patented Compact Demand Valve regulator combines high flow with a low profile to improve
mobility (Figure 3). The CDV exhalation valve greatly reduces breathing resistance which allows for
longer duration of cylinder use. The CDV is easily docked into the facepiece using a threaded hand
wheel. An optional first breath CDV is also available.
2.3 FIRST STAGE PRESSURE REDUCER
Air leaves the cylinder, passes through a sintered bronze filter in the hand wheel assembly, and then
continues on to the first-stage pressure reducer where it is reduced to approximately 125 psi. The
reducer is a simple piston type that requires no adjustment and incorporates an automatic, self-seat-
ing pressure relief valve to protect the downstream low-pressure components (Figure 4). It is made
of high quality aluminum, and is securely mounted to the cylinder.
2.4 REMOTE CYLINDER PRESSURE AND END-OF-SERVICE TIME INDICATORS
The remote pressure gauge and whistle assembly is chest mounted on the right shoulder strap. The
pressure gauge is waterproof with a neoprene protective cover and features a luminous dial and
pointer markings. The gauge display shows the fraction of cylinder pressure remaining.
The primary End-of-Service-Time indicator is a whistle which is set to sound at 23%-27% of rated
cylinder pressure per NIOSH requirements.
2.5 BACKFRAME AND HARNESS
The backframe and harness assembly utilize ergonomic design principles to produce a comfortable,
low profile unit that evenly distributes the SCBA weight between the wearer’s hips and shoulders
(Figure 5).
A quick-release cylinder band fits a wide range of cylinders with an infinitely adjustable strap to
ensure a tight fitting cylinder.
The harness material is a custom woven Nylon with easy slide shoulder buckles allowing for quick
donning of the Frontier SCBA. Optional Kevlar straps and shoulder pads are also available.
2.6 CYLINDER AND VALVE ASSEMBLY
A range of cylinder types and capacities are accommodated on the FRONTIER 2216 psi and 4500
psi models. (Please refer the table in Section 2.7 for specifics.)
The cylinder valve is of forged aluminum construction with a permanent Teflon coating. The valve
outlet is a standard CGA-346 fitting on 2216 psi cylinders, and a standard CGA-347 fitting on 4500
psi cylinders. Each valve has a frangible disc safety relief device, and a dual-reading pressure
gauge. Valve protection is provided by an elastomeric bumper.
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Never lift or carry the unit by the facepiece or gauge assembly. If a hose becomes kinked or oth-
erwise damaged, it should be replaced. Check for damage next to the metal ends of the hose.
CAUTION