10
SERVICE LIFE
Each configuration of self-contained breathing apparatus (SCBA) cer-
tified by NIOSH is assigned a "service life" classification by NIOSH.
The "service life" classification is determined by a breathing machine
test conducted by NIOSH. The tests are conducted on a breathing
machine which is designed to simulate an average adult user perform-
ing work at a "moderate work rate" as defined by NIOSH.
The user should not expect to obtain the NIOSH rated service life
from this respirator on each use. The work being performed may be
more or less strenuous than that used in the NIOSH test. Where
work is more strenuous, the duration may be less than one half the
NIOSH rated service time. Likewise, the time remaining after any end
of service indicator alarm actuates may be similarly reduced. The
end of service indicator alarms actuate when approximately 25% of
full cylinder pressure remains in the cylinder and valve assembly.
The VIBRALERT will continue to operate until the cylinder is nearly
depleted. The HEADS-UP DISPLAY end of service time indicator
will continue to operate until it is manually turned off.
The duration of the respirator will depend on such factors as:
1. the degree of physical activity of the user;
2. the physical condition of the user;
3. the degree to which the user’s breathing is affected by excitement,
fear or other emotional factors;
4. the degree of training or experience which the user has with this
or similar equipment;
5. whether or not the cylinder is fully charged at the start of the work
period;
6. the possible presence in the compressed air of carbon dioxide con-
centrations greater than .04% normally found in atmospheric air;
7. the atmospheric pressure; for example, if used in a pressurized
tunnel or caisson at 2 atmospheres (15 psi gauge or approximately
30 psi absolute) the duration will be one-half as long as when used
at 1 atmosphere; and at 3 atmospheres will be one-third as long;
8. loose or improperly fitting facepiece;
9. the condition of the respirator.
WARNING
ONLY THOSE RESPIRATOR COMPONENTS
APPROVED UNDER THE NIOSH CBRN STAN-
DARD MAY BE USED FOR A CBRN APPLICA-
TION. THE USE OF UNAUTHORIZED AND/OR
UNAPPROVED COMPONENTS OR ACCESSO-
RIES FOR A CBRN APPLICATION COULD
CAUSE PARTIAL OR COMPLETE FAILURE OF
THE RESPIRATOR WHICH MAY RESULT IN
SERIOUS INJURY OR DEATH.
QUESTIONS OR CONCERNS
If you have any questions or concerns regarding use of this equipment,
contact your authorized SCOTT dealer or distributor, or contact SCOTT
at 1-800-247-7257 (or 704-291-8300 outside the continental United
States) or visit our web site at www.scotthealthsafety.com.
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