Description - MSA FireHawk M7XT Fonctionnement/Entretien

DESCRIPTION

FireHawk M7XT Air Masks from MSA are pressure-demand,
self-contained breathing apparatus (SCBA) certified by the
National Institute for Occupational Safety and Health (NIOSH)
for use in atmospheres immediately dangerous to life or
health:
``Immediately dangerous to life or health'' means conditions
that pose an immediate threat to life or health or conditions
that pose an immediate threat of severe exposure to contami-
nants, such as radioactive materials, which are likely to have
adverse cumulative or delayed effects on health [Title 42 CFR,
Part 84.2, (Q)].
This air mask complies with the National Fire Protection
Association (NFPA) Standard 1981 for Open-Circuit Self-
Contained Breathing Apparatus (SCBA) for Emergency
Services, and Standard 1982 for Personal Alert Safety Systems
(PASS).
This air mask has been designated by NIOSH as being CBRN
(chemical, biological, radiological, and nuclear) Agent
Approved. It complies with the special tests under NIOSH 42
CFR 84.63(c); Chemical Agent Permeation and Penetration
Resistance Against Distilled Sulfur Mustard (HD) and Sarin (GB)
and the Laboratory Respirator Protection Level (LRPL) tests.
The FireHawk M7XT Air Mask consists of the following
components.
• PR14™ First Stage Regulator
• Firehawk Second Stage Regulator
• Cylinder and Valve Assembly
• Audi-Larm™ Audible Alarm with URC Assembly
• FireHawk M7 Carrier and Harness Assembly
• Ultra Elite ® Facepiece
• FireHawk M7 HUD or I-HUD
• FireHawk M7XT Control Module
• FireHawk M7XT Power Module
Optional FireHawk M7XT Air Mask Components
• Ultra Elite XT Communications System
• FireHawk M7XT Telemetry Module
• MSA Accountability System
• Rescue Belt II
• ExtendAire II (EBSS)
FIREHAWK M7XT AIR MASK COMPONENTS
PR14 FIRST STAGE REGULATOR
The PR14 First Stage Regulator reduces the pressure from the
cylinder and valve assembly to an intermediate pressure,
which is in turn further reduced by the Firehawk Second Stage
Regulator to a pressure that is respirable by the user.
The regulator incorporates a large, easily replaceable, sintered
filter to capture particulates that may be in the air stream.
DESCRIPTION
FIREHAWK SECOND STAGE REGULATOR
The Firehawk Regulator is a pressure-demand regulator, which
maintains a positive pressure in the facepiece while the air
mask is in use.
The Firehawk Regulator attaches to the facepiece via a slide-
to-connect or a push-to-connect feature.
There are also two types of Firehawk Regulator intermediate
pressure hose connections, threaded and quick-connect.
CYLINDER AND VALVE ASSEMBLY
Capacity
Cubic Ft.
45
88
45
66
*as approved by NIOSH
The cylinder valve includes a metal valve body, threaded con-
nection for filling and attachment of the Audi-Larm Alarm,
handwheel, safety disc (burst disc), and pressure gauge.
The pressure gauge continuously shows the air pressure in the
cylinder.
The handwheel is used to open and close the cylinder valve.
AUDI-LARM ALARM WITH URC ASSEMBLY
The Audi-Larm Alarm rings when there is approximately 33%
of the air mask's rated service time remaining and when the
cylinder valve is first opened, providing an audible indication
that the alarm is working properly.
A high pressure hose delivers air at cylinder pressure from the
Audi-Larm Alarm to the PR14 First Stage Regulator.
Cylinder
30 min. 2216 psi
30 min. 4500 psi
45 min. 4500 psi
60 min. 4500 psi
NOTE: The remaining service time calculations are based on a
40 LPM (liters per minute) NIOSH breathing rate.
All FireHawk M7XT Air Masks are equipped with an Audi-Larm
Alarm that includes a URC Assembly (Universal Rescue
Connection). The URC Assembly is a male Quick-Fill inlet for
use by Rapid Intervention Crews for emergency filling of the
5
Pressure Rated Service* Time
psig minutes
4500
4500
2216
4500
End of Service
Remaining Service
Time Indicator
Time (approx)
Pressure (approx)
10 minutes 785 psi
10 minutes 1600 psi
15 minutes 1600 psi
20 minutes 1600 psi
MSA 314 (L) Rev. 2 - 10128861
30
60
30
45