Page 5 of 44
P/N 595236-01 Rev. B 10/11
SERVICE LIFE
Each configuration of self-contained breathing apparatus (SCBA) certi-
fied by NIOSH is assigned a "service life" classification for a duration
time of each size of air supply cylinder (30 minute, 45 minute, etc.).
The service life duration time is determined by NIOSH using a breathing
machine designed to simulate an average adult user performing work at
a "moderate work rate."
Do not expect to obtain the NIOSH rated service life duration time 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 strenu-
ous, the duration may be less than one half the NIOSH rated service life,
and the time remaining after the end of service indicator alarm actuates
may be similarly reduced. The end of service indicator alarm actuates
when approximately 25% of full cylinder pressure remains in the cylinder
and valve assembly. The alarm will continue to operate until the cylinder
is nearly depleted.
The duration time 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 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 tun-
nel 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 OPTIONS AND/OR ACCES-
SORIES AUTHORIZED BY SCOTT AND AP-
PROVED BY NIOSH MAY BE INSTALLED
IN THIS RESPIRATOR. THE USE OF UNAU-
THORIZED AND/OR UNAPPROVED OPTIONS
OR ACCESSORIES COULD CAUSE PARTIAL
OR COMPLETE FAILURE OF THE RESPIRA-
TOR WHICH MAY RESULT IN INJURY OR
DEATH.
WARNING
THE USER OF THIS RESPIRATOR MUST RE-
CEIVE TRAINING IN THE OPERATION OF
THE RESPIRATOR INCLUDING THE OPERA-
TION OF ALL OPTIONS AND/OR ACCESSO-
RIES INCORPORATED IN THE RESPIRATOR.
SEE WARNING AT THE BEGINNING OF PAGE
TWO OF THIS INSTRUCTION.
WARNING
RESPIRATORS SHALL NOT BE WORN
WHEN CONDITIONS PREVENT A GOOD
FACE TO FACEPIECE SEAL OR A GOOD
SEAL AROUND THE NOSE CUP. SUCH
CONDITIONS MAY INCLUDE, BUT ARE NOT
LIMITED TO, GROWTH OF BEARDS, SIDE-
BURNS, A SKULL CAP THAT PROJECTS UN-
DER THE FACEPIECE, OR TEMPLE PIECES
ON GLASSES. ALSO, THE ABSENCE OF ONE
OR BOTH DENTURES CAN SERIOUSLY EF-
FECT THE FIT OF THE FACEPIECE. USE
OF THE RESPIRATOR WITHOUT A GOOD
FACE TO FACEPIECE SEAL OR A GOOD
SEAL AROUND THE NOSE CUP SEAL MAY
REDUCE THE DURATION OF USE AND/OR
EXPOSE THE USER TO THE ATMOSPHERE
THE RESPIRATOR IS INTENDED TO PRO-
TECT AGAINST RESULTING IN SERIOUS
INJURY OR DEATH.
