MSA PremAire Cadet Manual De Uso página 6

2 Operating Principles
WARNING!
• Particles and contaminants can enter an airline respirator system when air-supply hoses are disconnected and/ or
reconnected in a contaminated atmosphere. This could result in serious injury or death depending on the toxicity of
the contaminant involved. It is the responsibility of the user to determine the potential risk and to take the necessary
precautions which may include a requirement that NO disconnection or reconnection of air-supply hoses be
permitted in a contaminated atmosphere. If in doubt DO NOT disconnect and/ or reconnect.
• DO NOT disconnect when pressurized. Release all pressure from regulator by opening the bypass valve. Removing
the regulator when pressurized may result in serious personal injury, death, or damage to equipment.
• DO NOT use D/PD Duo-Twin Facepiece equipped PremAire CADET Respirators in IDLH atmosphere even if
equipped with the Emergency-Escape Air Cylinder.
• Never substitute, modify, add, or omit parts. Use only exact replacement parts in the configuration as specified by the
manufacturer.
Failure to follow this warning can result in serious personal injury or death.
2 Operating Principles
2.1 Operation
The PremAire CADET Supplied-Air Respirator provides respirable air to the user on demand - not constantly, as in a
constant-flow type device. As such, it is suitable for use with a large, compressed air cylinder of breathable air or a bank of
cylinders set up in cascade fashion. Alternatively, the PremAire CADET Respirator can be used with a compressor system
designed and configured to supply respirable breathing air to the respirator, within the NIOSH approved pressure range.
The PremAire CADET Respirator is designed to maintain a slight positive pressure of air inside the facepiece, whether the
wearer is inhaling or exhaling, to prevent contaminants from entering the facepiece, should there be slight face-to-
facepiece seal leakage.
WARNING!
DO NOT use the PremAire CADET Respirator in an IDLH atmosphere. DO NOT use the PremAire System for firefighting.
Failure to follow this warning can result in serious personal injury or death.
IDLH means conditions that pose an immediate threat to life or health or conditions that pose an immediate threat of severe
exposure to contaminants, such as radioactive materials, which are likely to have adverse cumulative or delayed effects on
health [Title 42 CFR, Part 84].
Non-IDLH means any hazardous atmosphere which may produce physical discomfort immediately, chronic poisoning after
repeated exposure, or acute adverse physiological symptoms after prolonged exposure. [Title 42 CFR, Part 84].
In normal use, the pressure-demand respirator is connected to an air supply of a type and duration selected by the user
and will provide respiratory protection as long as the user remains connected to the air supply.
The heart of the PremAire CADET Respirator is a pressure-demand regulator mounted at the facepiece. This mask
mounted regulator maintains a slight positive pressure within the facepiece while regulating and reducing the air supply to
a breathable pressure.
2.2 Air Supply Hose and Pressure Gauge
PremAire CADET Respirators can be used with a wide range of MSA air-supply hose, which can be interconnected up to a
maximum length of 300 feet. A maximum of 12 sections of air-supply hose may be used in making up the maximum 300
feet working length of hose. Each section of coiled hose is considered 50 feet in length (maximum 6 sections). MSA air-
supply hoses have various recommended temperature ranges.
WARNING!
DO NOT use the PremAire CADET Respirator whenever ambient or inlet-air temperatures are outside the temperature
ranges specified below for each hose material.
Failure to follow this warning can result in serious personal injury or death.
6 PremAire Cadet US