Factors That Affect The Service Life Of The Scba; Standard Operation - MSA G1 SCBA Operating Manual

7.1

Factors that Affect the Service Life of the SCBA

CAUTION!
The service life of the SCBA is greatly reduced when the regulator bypass is used.
The following factors can affect the duration or service life of the equipment:
• Your average degree of physical activity
• Your general physical condition
• The degree to which your breathing rate is increased by excitement, fear, or other emotional
factors
• Your degree of training or experience with this or similar equipment
• Whether the cylinder is fully charged
• The concentration of carbon dioxide in the compressed air more than the 0.04 percent level
normally found in atmospheric air
• Atmospheric pressure: the service life of the SCBA is based on 1 atm (101,325 Pa) of pressure. If
used in a pressurized tunnel or caisson at 2 atm (202,650 Pa), the service life of the SCBA will be
half as long as when it is used at 1 atm (101,325 Pa). At 3 atm (303,975 Pa), the service life will
be one-third as long.
• Condition of the SCBA
7.2

Standard Operation

Periodically check the pressure indicated on the HUD and chest-mounted pressure indicator during
use.
The control module continually displays the cylinder pressure. The HUD indicates when each
segment of the total cylinder pressure has been reached.
When the needle on the pressure indicator goes into the red zone on the gauge face, the primary low-
pressure warning device alarms, a red pressure LED flashes on the HUD, and the ALARM button on
the control module and the buddy lights on the power module flash red.
The HUD, control module, and primary low-pressure warning device indicate when cylinder pressure
decreases below the following approximate values:
• 775 psi for 2216 psi systems
• 1575 psi for 4500 psi systems
• 1925 psi for 5500 psi systems
G1 SCBA 2018 Edition
During Use
US
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