BioPak 240R-NIOSH User Instruction Manual
47C090, Revision C
Page 10 of 25
2. APPARATUS DESCRIPTION
2.1 General
BioPak 240R
is a closed-circuit, positive-
pressure, self-contained breathing
apparatus (CCBA) for use in long-duration
missions into atmospheres that are
immediately dangerous to life and health
(IDLH). Applications may include mine
rescue, fire-fighting, confined space entry,
domestic preparedness, military, tunnel
rescue and HAZMAT.
All versions of the
BioPak 240R
feature a
backpack-style housing that is worn over the
shoulders and hips of the wearer. A
pressure gauge is supplied to indicate
remaining stores of oxygen and two visual
alarms and one audible alarm is provided for
system status.
The closed-circuit design will recycle the
user’s exhalation breath by removing carbon
dioxide, replacing consumed oxygen,
trapping condensation and cooling the
breathing gas.
The positive-pressure design will maintain
internal breathing gas pressures slightly
above external atmospheric pressure. This
feature will provide increased protection
against the inward migration of external
toxins to the wearer.
All external housing components are static
dissipative and flame retardant.
The
BioPak 240R
is approved to the USA
standards illustrated by the approval labels
in the beginning of this manual.
2.2 Harness
The
BioPak
harness is padded to increase
wearer comfort. The flame-retardant
harness is manufactured from Kevlar™ and
Nomex™ materials with stainless steel
hardware. The harness is attached directly
to the apparatus via locking stainless steel
screws.
2.3 Housing
The backpack-style housing is injection
molded from a flame-retardant
polycarbonate/stainless steel alloy that is
lightweight, high-strength and static-
dissipative. The housing consists of a lower
portion and an upper portion that snap
together in a secure fashion without the
need for connection hardware.
2.4 Breathing Loop
The breathing loop consists of the breathing
chamber, breathing hoses, facemask
connector and facemask.
The breathing chamber consists of the
center section, center section lid and
diaphragm. The spring loaded diaphragm
maintains positive pressure within the
apparatus. All oxygen additions will occur
within the breathing chamber as well as over
pressure venting. Carbon dioxide is
removed from exhalation gas by the carbon
dioxide scrubbers located within the
breathing chamber. Excessive moisture will
be retained by the moisture containment
sponges located within the center section.
Inhalation gas cooling is achieved as the
gas travels around the two coolant canisters
of the breathing chamber and past the
Internal phase change module (PCM)...
