Scott SKA-PAK AT Installation and operation manual

Page 1 of 44 P/N 595189-01 Rev A 4/10
TYPICAL SKA-PAK AT WITH STANDARD HARNESS
REAR VIEW
TYPICAL SKA-PAK AT WITH STANDARD HARNESS
FRONT VIEW
Scott SKA-PAK AT units may vary in appearance, accessories and options.
OPERATING & MAINTENANCE INSTRUCTIONS
AIRLINE
CONNECTION
HOSE
HOSE FROM
PRESSURE
REDUCER TO
BREATHING
REGULATOR
CYLINDER
AND VALVE
ASSEMBLY
SHOULDER
STRAP
AIRLINE
CONNECTION
HOSE
PRESSURE
REDUCER
HEAD
HARNESS
CYLINDER
VALVE KNOB
BREATHING
REGULATOR
WITH VIBRALERT
HOSE FROM
PRESSURE REDUCER
TO BREATHING
REGULATOR
SKA-PAK®AT
AUTO TRANSFER
COMBINATION SELF-CONTAINED BREATHING APPARATUS
FOR ESCAPE AND PRESSURE DEMAND TYPE C
SUPPLIED-AIR RESPIRATOR WITH AUTO TRANSFER
FACEPIECE
PRESSURE GAUGE
WITH ELECTRONIC
ALARM
WARNING
IMPROPER USE OF THIS RESPIRATOR MAY RESULT IN PERSONAL INJURY OR DEATH.
IMPROPER USE INCLUDES, BUT IS NOT LIMITED TO, USE WITHOUT ADEQUATE TRAINING,
DISREGARD OF THE WARNINGS AND INSTRUCTIONS CONTAINED HEREIN, AND FAILURE
TO INSPECT AND MAINTAIN THIS RESPIRATOR.
THIS RESPIRATOR IS INTENDED TO BE USED ONLY IN CONJUNCTION WITH AN ORGANIZED
RESPIRATORY PROTECTION PROGRAM WHICH COMPLIES WITH THE REQUIREMENTS OF
"PRACTICES FOR RESPIRATORY PROTECTION," Z88.2 AVAILABLE FROM AMERICAN NATIONAL
STANDARDS INSTITUTE INC., 1430 BROADWAY, NEW YORK, N.Y., 10018; OR THE REQUIREMENTS
OF OSHA SAFETY AND HEALTH STANDARD 29 CFR 1910 PARAGRAPH 134 AVAILABLE FROM THE
U. S. DEPARTMENT OF LABOR, OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION; OR
OTHER PERTINENT NATIONALLY RECOGNIZED STANDARDS, SUCH AS THOSE PROMULGATED
BY THE US COAST GUARD OR THE DEPARTMENT OF DEFENSE.
COPYRIGHT ® 2010, SCOTT, All Rights Reserved

Page 2 of 44P/N 595189-01 Rev A 4/10
WARNING
CERTAIN ENVIRONMENTS MAY REQUIRE
THAT PROTECTIVE MATERIAL COVER
SOME OR ALL OF THE RESPIRATOR IN
ADDITION TO COVERING THE USER. THE
USER MUS T BE ABLE T O ACCESS THE
CONTROLS OF THE RESPIRATOR AT ALL
TIMES. INABILITY TO ACCESS CONTROLS
OF THE RESPIRATOR WHEN THE RES-
PIRATOR IS NEEDED FOR ESCAPE MAY
RESULT IN SERIOUS INJURY OR DEATH.
WARNING
DO NOT USE THE SELF-CONTAINED AIR
SUPPLY FOR ANY PURPOSE OTHER THAN
EMERGENCY ESCAPE. IF THE SELF-CON-
TAINED AIR SUPPLY HAS BEEN DEPLETED,
THERE MAY BE INSUFFICIENT AIR SUPPLY
FOR ESCAPE WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
IF EITHER THE VIBRALERT END OF SER-
VICE TIME INDICATOR OR THE ELECTRONIC
ALARM ACTUATES AT ANY TIME DURING
RESPIRATOR USE, LEAVE THE AREA RE-
QUIRING RESPIRATORY PROTECTION IMME-
DIATELY. ACTUATION OF THE VIBRALERT
MEANS THAT THE AIR SUPPLY HOSE HAS
FAILED AND IS NO LONGER PROVIDING THE
NECESSARY PRESSURE TO OPERATE THE
RESPIRATOR. ACTUATION OF THE ELEC-
TRONIC ALARM MEANS THAT THE AIR SUP-
PLY CYLINDER HAS BEEN DEPLETED TO
90% (+/-5%) OF FULL VOLUME. IN EITHER
CASE, FAILURE TO LEAVE THE HAZARD-
OUS AREA IMMEDIATELY MAY RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
DO NOT OPERATE THIS EQUIPMENT WHILE
UNDER THE INFLUENCE OF DRUGS, ALCO-
HOL, OR ANY MEDICATIONS OR SUBSTANC-
ES WHICH MAY AFFECT VISION, DEXTERITY,
OR JUDGMENT. USERS OF THIS EQUIPMENT
MUST BE IN GOOD PHYSICAL AND MENTAL
HEALTH IN ORDER TO OPERATE SAFELY.
DO NOT USE THIS EQUIPMENT WHEN FA-
TIGUE PREVENTS SAFE OPERATION. STAY
ALERT WHEN OPERATING THIS EQUIPMENT.
INATTENTION OR CARELESSNESS WHILE
OPERATING THIS EQUIPMENT MAY RESULT
IN SERIOUS INJURY OR DEATH.
GENERAL DESCRIPTION
The Scott SKA-PAK AT respirator is approved by the National In-
stitute for Occupational Safety and Health (NIOSH) as a pressure-
demand, open circuit, combination self contained breathing apparatus
for escape and Type C supplied-air respirator. The SKA-PAK AT is
designed to provide respiratory protection during entry into, work in
and escape from an objectionable, oxygen deficient and/or unbreath-
able (toxic) atmosphere.
This respirator is to be used only by persons trained in the use of
the respirator and only in conjunction with an organized respiratory
protection program. This respirator is not to be used under water, for
interior structural fire fighting or for any other purpose not authorized
by the organized respiratory protection program that applies specifi-
cally to the user.
The SKA-PAK AT is referred to as a “combination SCBA/hoseline”
respirator because it operates as either a pressure-demand Type C
supplied-air respirator when using air from a remote air supply system
connected to the supply hose or as an escape only self-contained
breathing apparatus when using air from the cylinder on the waist
belt. The self-contained air supply may be used if the remote air sup-
ply system fails or when the air supply hose must be disconnected
from the respirator for emergency escape from the work area. The
SKA-PAK AT offers the additional advantage of an Automatic Transfer
pressure reducer which can detect an interruption in the supplied-
airline air pressure and automatically switch to the breathing cylinder
while warning the user through the VIBRALERT® end of service time
indicator in the facepiece mounted regulator.
The SKA-PAK AT is available in five configurations for use with
the following air supply cylinders: 2216 psi 3 minute, 3000 psi 5
minute, 10 minute and 15 minute, and 4500 psi 10 minute and 15
minute. These time durations represent NIOSH standards. Depend-
ing on activity and respiration rate, the actual duration may be much
less than the NIOSH rating. Refer to the NIOSH approval label for
the SKA-PAK AT, SCOTT P/N 595014-01, for the list of approved
component part numbers.
When used as a Type C supplied-air respirator, the SKA-PAK AT
must be supplied with clean, respirable air through the appropriate
air supply hose.
The respirator consists of an adjustable harness to support the
respirator on the body of the user, a cylinder and valve assembly
for storing compressed breathing air, an automatic transfer pres-
sure reducing regulator and coupling mounted on the cylinder
valve, a cylinder pressure gauge with an ELECTRONIC alarm, an
airline connection hose, one or more segments of air supply hose
to connect the respirator to an air supply system, a hose assembly
connecting the pressure reducer to the facepiece mounted pres-
sure demand breathing regulator with VIBRALERT®, and a full
facepiece assembly.
SKA-PAK®AT
AUTO TRANSFER
COMBINATION SELF-CONTAINED BREATHING APPARATUS WITH HARNESS
FOR ESCAPE AND PRESSURE DEMAND TYPE C
SUPPLIED-AIR RESPIRATOR WITH AUTO TRANSFER

Page 3 of 44 P/N 595189-01 Rev A 4/10
WARNING
FAILURE TO PROPERLY FIT THE RESPIRA-
TOR FACEPIECE TO THE USER MAY RESULT
IN LITTLE OR NO RESPIRATORY PROTEC-
TION AND MAY EXPOSE THE WEARER TO
SUBSTANCES WHICH CAN CAUSE SERIOUS
INJURY OR DEATH.
The breathing regulator is equipped with a VIBRALERT alarm which
warns the user with both sound and feel that the supplied-airline
pressure has been interrupted and that the reducer has automatically
transferred to the cylinder air supply. The ELECTRONIC alarm will
be actuated when the cylinder pressure drops below 90% (+/- 5%)
of full rating, whether caused by breathing down the cylinder or to
indicate a malfunction or leak in the cylinder supply system. The
ELECTRONIC alarm requires one 9V battery for operation. See the
ELECTRONIC ALARM BATTERY REPLACEMENT section of this
instruction.
The breathing regulator is also equipped with an air-saver/donning
switch to prevent rapid loss of air if the air supply is turned on before
donning the facepiece or if the facepiece is removed before discon-
necting the supply hose or before turning off the air supply. The
regulator is available with or without a quick disconnect fitting.
SCOTT full facepieces are available in a variety of styles and sizes.
The facepieces may be readily detached from the breathing regulator
to allow for the use of the best fitting and most comfortable size or
style facepiece for an individual user. Fit testing per OSHA Standard
29 CFR Part 1910 or ANSI Standard Z88.2 requires testing in the
negative pressure mode using equipment such as a Portacount®
Plus2Respirator Fit Tester. For this, SCOTT facepieces require use
of SCOTT Fit Test Adapter P/N 804057-01 or equivalent and appropri-
ate negative pressure testing equipment. Mask Seal Kit P/N 805655-
01 may also be required to attain a proper fit. Each size facepiece
may be equipped with a lens kit if the use of corrective spectacles
is required.
Several self-contained air cylinders are available for use with the
SKA-PAK AT.
The airline air supply must be supplied with breathing air known to
be suitable for human respiration at a pressure of 80 psig to 115 psig
operation with a minimum flow rate of 200 liters per minute (lpm).
Airline connection hoses used during Type C supplied-air respirator
operation have one of five types of quick connect plugs and come
in single- or dual-plug versions. Dual plug versions provide a facil-
ity for transition between redundant air supply hoses. On both the
single and dual plug versions, a check valve in the pressure reducer
prevents air flow from the respirator when the air supply hose is not
in use or is disconnected from the respirator. On dual plug versions,
each plug is individually checked to prevent depletion of the air sup-
ply when one (or both) of the air supply hoses is disconnected from
the respirator or not in use.
Air supply hoses are available in several lengths. The maximum length
and maximum number of segments of air supply hose allowed varies
with the type of air supply hose. The air supply hoses and their limita-
tions are covered in Table 1 and Table 2 of this instruction sheet.
1 Kevlar is a registered trademark of E.I. du Pont de Nemours, Inc.
2 Portacount®Plus is a registered trademark of TSI Incorporated
WARNING
RESPIRATORS SHALL NOT BE WORN WHEN
CO N D I TION S PR E V E NT A G O O D FAC E
TO FACEPIECE SEAL OR A GOOD SEAL
AROUND THE NOSE CUP. SUCH CONDI-
TIONS MAY INCLUDE, BUT ARE NOT LIMIT-
ED TO, GROWTH OF BEARDS, SIDEBURNS,
A SKULL CAP THAT PROJECTS UNDER
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.
GENERAL DESCRIPTION
CONTINUED ON NEXT PAGE...
WARNING
THE USE OF AIR SUPPLY HOSE OTHER
THAN THOSE SPECIFICALLY INTENDED FOR
USE WITH THE RESPIRATOR OR THE USE
OF LENGTHS EXCEEDING THE MAXIMUM
LENGTHS SPECIFIED MAY REDUCE THE
ABILITY OF THE RESPIRATOR TO SUPPLY
AIR AND MAY EXPOSE THE USER TO THE
HAZARDOUS ATMOSPHERE WHICH MAY
RESULT IN SERIOUS INJURY OR DEATH.
WARNING
USE ONLY BREATHING AIR KNOWN TO BE
SUITABLE FOR HUMAN RESPIRATION. THE
USE OF "TOOL AIR," "INSTRUMENT AIR,"
OR ANY AIR SUPPLY NOT SPECIFICALLY
INTENDED FOR HUMAN BREATHING CAN
RESULT IN SERIOUS INJURY OR DEATH.
WARNING
IF USE OF A HOSE IN THE WORK AREA
WILL CREATE A HAZARD, DO NOT USE THIS
RESPIRATOR. MAKE WHATEVER CHANGES
ARE NECESSARY FOR SAFETY, SUCH AS
SELECTING AN APPROPRIATE RESPIRA-
TOR. FAILURE TO CONSIDER ALL POS-
SIBLE CIRCUMSTANCES IN THE USE OF
THIS EQUIPMENT MAY RESULT IN SERIOUS
INJURY OR DEATH.

Page 4 of 44P/N 595189-01 Rev A 4/10
ADJUSTABLE HARNESSES
STANDARD HARNESSES
Two versions of the standard harness are available: a flame re-
sistant waist and shoulder harness made of Kevlar1black aramid
webbing with yellow stripes and metallic buckles, and a corrosion
resistant waist and shoulder harness made of black nylon webbing
with nonmetallic buckles. If accidental exposure to heat and/or flame is
possible, use only the Kevlar head harness and the Kevlar waist and
shoulder harness on SKA-PAK AT respirators. The black-colored nylon
webbing used on the corrosion resistant waist and shoulder harness
and the black-colored polyester head harness will soften or melt if
exposed to high temperatures and, if exposed to flame, may burn.
The SKA-PAK AT Retrofit Kit provides the SKA-PAK AT reducer as-
sembly and the required VIBRALERT® regulator to use the SKA-PAK
AT with an original SKA-PAK and SKA-PAK PLUS standard harnesses.
To maintain compliance with the NIOSH approval, a service update
of the associated cylinder and valve assemblies may have to be per-
formed by an authorized SCOTT Service Center. Check the NIOSH
approval label for the SKA-PAK AT, SCOTT P/N 595014-01, for the
list of approved component part numbers.
FULL BODY HARNESS
Where fall protection is required, the SKA-PAK AT is available with
a multipurpose Full Body Harness (P/N 805061-04). This harness is
intended to be used only in accordance with both the user's respira-
tory protection program and fall protection program. For additional
instructions on application, fitting, maintenance, and inspection of the
Full Body Harness, see DBI/SALA® document (SCOTT P/N 89497-01)
provided with the Full Body Harness.
GENERAL DESCRIPTION CONTINUED...
AIRLINE
SUPPLY HOSE
CYLINDER AND
VALVE ASSEMBLY
FULL BODY
HARNESS
AIRLINE
CONNECTION
HOSE
PRESSURE
REDUCER
HEAD HARNESS
CYLINDER
VALVE KNOB
BREATHING
REGULATOR
WITH VIBRALERT HOSE FROM
PRESSURE
REDUCER TO
BREATHING
REGULATOR
FACEPIECE
PRESSURE GAUGE
WITH ELECTRONIC
ALARM
TYPICAL SKA-PAK AT
WITH FULL BODY HARNESS
REAR VIEW
TYPICAL SKA-PAK AT
WITH FULL BODY HARNESS
FRONT VIEW
WARNING
DO NOT USE THE BLACK POLYESTER HEAD
HARNESS OR BLACK NYLON WAIST AND
SHOULDER HARNESS WHEN ACCIDENTAL
EXPOSURE TO HIGH HEAT OR FLAME IS
A POSSIBILITY. IN THOSE CIRCUMSTANC-
ES, THE POLYESTER MAY MELT OR BURN
CAUSING INJURY OR MAY INTERFERE WITH
RESPIRATORY PROTECTION RESULTING IN
SERIOUS INJURY OR DEATH.
WARNING
MANUFACTURERS INSTRUCTIONS FOR
THE FULL BODY HARNESS MUST BE FOL-
LOWED. DO NOT USE HARNESS IF WEAR
OR DAMAGE IS PRESENT. IF BODY HAR-
NESS HAS BEEN SUBJECTED TO FALL
ARREST OR IMPACT FORCES IT MUST BE
IMMEDIATELY REMOVED FROM SERVICE
AND DESTROYED. CONNECTING SNAP AND
D-RING MUST BE COMPATIBLE IN SIZE,
SHAPE AND STRENGTH. FAILURE TO FOL-
LOW MANUFACTURER’S INSTRUCTIONS
FOR HARNESS MAY RESULT IN SERIOUS
INJURY OR DEATH.

Page 5 of 44 P/N 595189-01 Rev A 4/10
WARNING
THE HIGH PHYSICAL AND/OR EMOTIONAL
LEVEL ASSOCIATED WITH EMERGENCY
SITUATIONS TEND TO INCREASE BREATH-
ING RATE AND TO DECREASE THE ACTUAL
DURATION OF THE SELF-CONTAINED AIR
SUPPLY. FAILURE TO CONSIDER THESE
FACTORS MAY RESULT IN SERIOUS INJURY
OR DEATH.
WARNING
DO NOT USE THIS RESPIRATOR IN A PRES-
SURIZED ENVIRONMENT. THE DURATION OF
THE SELF-CONTAINED AIR CYLINDER ON
THIS RESPIRATOR WILL BE SIGNIFICANTLY
SHORTER IN A PRESSURIZED ATMOSPHERE
AND MAY NOT PROVIDE ADEQUATE TIME
FOR ESCAPE RESULTING IN SERIOUS INJURY
OR DEATH.
WARNING
THE PURGE VALVE IS AN EMERGENCY CON-
TROL FOR USE ONLY IN THE EVENT OF A
FAILURE OF THE MASK MOUNTED BREATH-
ING REGULATOR. OPENING THE PURGE
VALVE FOR ANY OTHER REASON WHILE
THE RESPIRATOR IS BEING SUPPLIED WITH
AIR FROM THE ESCAPE AIR SUPPLY CYL-
INDER COULD EXHAUST THE RESPIRATOR
AIR SUPPLY IN AS LITTLE AS 2 MINUTES
AND MAY RESULT IN SUDDEN TERMINATION
OF BREATHING AIR WHICH COULD CAUSE
SERIOUS INJURY OR DEATH.
DURATION OF THE RESPIRATOR
The SKA-PAK AT respirator is rated and approved by NIOSH as a
combination self-contained breathing apparatus for escape and pres-
sure demand Type C supplied-air respirator.
The duration of this respirator, when used as a Type C supplied-air
respirator, is limited only by the capacity of the air-supply system.
The duration of this respirator during use as an escape only SCBA
is limited by the capacity of the self-contained air supply cylinder on
the waist belt. The cylinder's rated duration is marked on the cylinder.
The user should not expect to obtain exactly the stated duration of
breathing air during each use of the self-contained air supply cylin-
der. The user’s breathing rate may be more or less than the 40 lpm
respiration standard used in the NIOSH tests. Depending on activity
and respiration rate, the actual duration may be less than 1/2 the
rated duration of the air supply cylinder.
The length of time the self-contained air supply cylinder will continue
to provide breathing air during any one use depends 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 excite-
ment, fear or other emotional factors.
4. The degree of training or experience the user has with this or
similar equipment.
5. Whether or not the cylinder is fully charged at the start of the use
period.
6. The possible presence in the compressed air of carbon dioxide
concentrations 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 psig gauge) 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. Whether the purge valve is open.
10. The condition of the respirator.
INTRINSIC SAFETY
The SCOTT SKA-PAK AT respirator equipped with an electronic
end of time indicator (ELECTRONIC alarm) is listed by SGS U. S.
TESTING COMPANY INC. as intrinsically safe per ANSI/UL Std.
UL-913 for use in Class I, II, III, Groups A, B, C, D, E, F, and G
Hazardous Locations when powered by one of the following 9 volt
batteries: Energizer2Alkaline No. 522 or EN22, Duracell3Alkaline
No. PC 1604 or MN 1604, or for increased service life use Ultralife4
Lithium Battery No. U9VL.
WARNING – Substitution of Components May Impair Intrinsic Safety. To
reduce the risk of ignition of a ammable atmosphere, batteries must only
be changed in an area known to be nonammable. To reduce the risk of ex-
plosion, do not mix old batteries with unused batteries, or mix batteries from
different manufacturers.
The electronic end of service time indicator has not been evalu-
ated as an ignition source in explosive or flammable atmosphere
by MSHA/NIOSH.
WARNING
REGULARLY INSPECT THE SKA-PAK AT
RESPIRATOR INCLUDING THE ELECTRONIC
ALARM AS DESCRIBED IN THIS INSTRUC-
TION. VERIFY THAT THE PROPER BATTER-
IES ARE USED AND THAT THERE IS NO
DAMAGE TO OR MODIFICATION OF THE
UNIT THAT WOULD IMPAIR THE INTRINSIC
SAFETY. IF THE SKA-PAK AT IS USED IN AN
EXPLOSIVE OR FLAMMABLE ATMOSPHERE,
FAILURE TO CORRECT CONDITIONS THAT
MAY IMPAIR THE INTRINSIC SAFETY OF
THE EQUIPMENT MAY LEAD TO A FIRE OR
AN EXPLOSION WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.
3Energizer is a registered trademark of Eveready Battery Company, Inc., St. Louis, MO.
4 Duracell is a registered trademark of the Procter & Gamble Company, Cincinnati, OH .
5Ultralife is a registered trademark of Ultralife Batteries, Inc., Newark, NY.
QUESTIONS OR CONCERNS
If you have any questions or concerns regarding use of this equipment, contact
your authorized SCOTT 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.

Page 6 of 44P/N 595189-01 Rev A 4/10
FACEPIECE FITTING AND FIT TESTING
A respirator Quantitative Fit Test must be performed to ensure the correct
respirator facepiece size has been selected and assigned to the user. It is
the responsibility of the Respiratory Protection Program Manager or Safety
Coordinator to assist the user in selecting the correct respirator size relative
to the user’s facial features and dimensions. Fit Testing must be performed
with any approved SCOTT accessories that will be used with the respirator
installed, such as a communications device installed on the facepiece.
Respirator fit tests are explained fully in the American National Standard
Practices for Respiratory Protection, ANSI Z88.10-2001 which is published
by the American National Standards Institute (ANSI), 11 West 42nd Street,
New York, New York, 10036, and in the Occupational Safety and Health
Standards, OSHA 29 CFR 1910.134 Appendix A, which is published by the
Occupational Safety and Health Administration (OSHA), 200 Constitution
Avenue, NW, Washington DC, 20210.
Quantitative Fit Testing per OSHA Standard 29 CFR Part 1910.134 Appendix
A, or ANSI Standard Z88.10-2001 requires testing in the negative pressure
mode using equipment such as a Portacount®1 Respirator Fit Tester. For
Quantitative Fit Testing, SCOTT facepieces require use of the appropriate
negative pressure testing equipment such as the Portacount Respirator Fit
Tester along with the following:
• SCOTT 40mm facepiece Adapter, P/N 200423-01,
• a new SCOTT P100 Cartridge, P/N 052683,
• SCOTT Probed Fit Test Adapter P/N 805628-01 or equivalent probed
facepieces and the full range of sizes and styles
• Mask Seal Kit, P/N 805655-01
• the appropriate SCOTT communication device and mounting bracket
properly installed on the facepiece, if such an accessory will be used
with the respirator.
• any other optional hood, eyeglass, or other accessory that will be used
with the respirator.
The size and style facepiece must be selected based on the user’s mea-
sured face size. For initial fitting, carefully don the facepiece and conduct a
NEGATIVE PRESSURE LEAK TEST according to the instructions provided
with the 40mm Adapter. Refer to the DONNING PROCEDURE section of this
instruction for the procedure. Follow the DONNING PROCEDURE CARE-
FULLY. If the selected facepiece does not pass the NEGATIVE PRESSURE
LEAK TEST or does not fit securely without movement in the chin or chin
cup area or the user experiences discomfort in the chin or throat, try the
next nearest size, larger or smaller. After passing the NEGATIVE PRESSURE
LEAK TEST, the facepiece size selected must be verified by successfully
passing a respirator Quantitative Fit Test.
When fit testing for Open-Circuit, Pressure Demand Self-Contained Breath-
ing Apparatus and/or Type C Pressure-Demand Supplied Air Respirator
mode of operation (minimum Fit Factor equal to or greater than 500
minimum) appropriate negative pressure testing equipment must be used.
You should use a P100 Filter, SCOTT P/N 052683 and the SCOTT P/N
805628-01 Fit Test Adapter.
When using a Portacount Respirator Fit Tester for Quantitative Fit Test-
ing, TSI recommends that the level of particles in the ambient air must be
between 5000 and 30000 particles/cm3. Refer to the Portacount Respirator
Fit Tester user instructions for details including available Particle Genera-
tors to use with the Portacount Respirator Fit Tester if you have difficulty
achieving the minimum level of ambient particle count required.
Test subjects must be in good health at the time of the fit testing. Smoking
or eating less than 30 minutes prior to the test is prohibited. Any and all
conditions that might interfere with a good face to facepiece seal must be
addressed and corrected before performing the fit testing. Refer to the list
of conditions in the DONNING PROCEDURES section of this instruction.
WARNING
FIT TESTING IN ACCORDANCE WITH OSHA
STANDARD 29 CFR PART 1910 IS REQUIRED
AS PART OF THE REQUIRED TRAINING BE-
FORE USE OF THIS RESPIRATOR. FAILURE
TO PROPERLY FIT AND TRAIN THE USER
IN USE OF THE FACEPIECE AND RESPIRA-
TOR MAY RESULT IN EXPOSURE TO THE
HAZARDOUS ATMOSPHERE WHICH COULD
LEAD TO SERIOUS INJURY OR DEATH.
WARNING
THE USER MUST BE PROPERLY FITTED
USING A RESPIRATOR QUANTITATIVE FIT
TEST BEFORE USE AND FOLLOW ALL
WARNINGS AND SPECIAL OR CRITICAL
USER’S INSTRUCTIONS SPECIFIED DUR-
ING USE. FAILURE TO DO SO MAY RESULT
IN SERIOUS INJURY OR DEATH.
WARNING
RESPIRATORS SHALL NOT BE WORN WHEN
CONDITIONS PREVENT A GOOD FACE
SEAL. SUCH CONDITIONS MAY INCLUDE,
BUT ARE NOT LIMITED TO, GROWTH OF
BEARDS, SIDEBURNS, FACIAL HAIR OR
LOW HAIRLINE THAT CROSSES OR IN-
TERFERES WITH THE SEALING SURFACE,
THICK OR PROTRUDING HAIRSTYLES SUCH
AS PONY TAILS OR BUNS THAT INTERFERE
WITH THE SMOOTH AND CLOSE FIT OF THE
HEAD HARNESS TO THE HEAD, A SKULL
CAP THAT PROJECTS UNDER THE FACE-
PIECE, TEMPLE PIECES ON CORRECTIVE
EYE GLASSES, EXCESSIVE USE OF COS-
METICS INCLUDING MOISTURIZERS, MAKE-
UP, OR AFTER SHAVE, OR ANYTHING ELSE
WHICH INTERFERES WITH THE FACE TO
FACEPIECE SEAL. ALSO, THE ABSENCE OF
ONE OR BOTH DENTURES CAN SERIOUSLY
AFFECT THE FIT OF A FACEPIECE. USE OF
AN IMPROPERLY FITTED FACEPIECE MAY
LEAD TO EXPOSURE TO THE HAZARDOUS
ATMOSPHERE WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.

Page 7 of 44 P/N 595189-01 Rev A 4/10
To verify the fit factor of the respirator, testing must incorporate an exercise
regimen of normal daily activities. SCOTT requires the following set of fit
test exercises, which are based on OSHA Standard 29 CFR Part 1910.134
Appendix A, and ANSI Z88.10-2001 with modifications.
Exercises are to be performed each for 60 seconds (except as noted) in
a standing position during the test:
• Normal Breathing
• Deep breathing
• Turning head side to side
• Moving head up and down (look up/look down)
• Talking (read the Rainbow Passage)
• Grimace (15 seconds)
• Bending Over (touch toes) / Reach up (toward the ceiling)
• Normal Breathing (repeat)
Fit test exercises must be performed carefully as if the respirator was being
used in a hazardous atmosphere. DO NOT bump the facepiece, filter, or
adapter into the body through exaggerated motions. DO NOT talk except
when directed to by the test administrator.
SCOTT requires that users of this respirator with an approved SCOTT
facepiece, must achieve a Fit Factor of at least 500 for Type C Pressure-
Demand Supplied Air Respirator mode of operation for use with their as-
signed facepiece style and size using the fit test procedures and exercise
regimen stated above. If a Fit Factor of at least 500 cannot be achieved
with any facepiece size or style, the user MUST NOT use this respirator.
If the respirator user passes a NEGATIVE PRESSURE LEAK TEST but
DOES NOT pass a respirator Quantitative Fit Test, try the next nearest
size, larger or smaller and repeat the NEGATIVE PRESSURE LEAK TEST
and the Quantitative Fit Test. If leakage is still detected, either per these
user instructions or the OSHA fit testing process, the use of Mask Seal Kit
P/N 805655-01 may be required to attain a proper fit. Refer to the INSTAL-
LATION AND USE INSTRUCTIONS, SCOTT P/N 89462-01, included with
the Mask Seal Kit. After installing the Mask Seal Kit, repeat the fit testing
process to confirm a proper fit.
Once the proper size is selected and assigned to the user following suc-
cessful Portacount Respirator Fit Tester testing to achieve minimum Fit
Factors required, the respirator user must perform and pass a NEGATIVE
PRESSURE LEAK TEST as described in these instructions every time the
facepiece is donned to ensure proper fit before using the respirator in a
hazardous atmosphere.
During NEGATIVE PRESSURE LEAK TESTING, any facepiece leakage
that is detected from other than the face to facepiece seal may indicate
damaged or defective equipment. Remove the defective equipment from
service and tag for repair by authorized personnel. Repeat the testing with
equipment known to be operating properly.
IF A SATISFACTORY NEGATIVE PRESSURE LEAK TEST CANNOT BE
PERFORMED, DO NOT USE THE RESPIRATOR OR ENTER THE HAZ-
ARDOUS ATMOSPHERE.
The facepiece alone does not provide any protection against a hazardous
atmosphere without the use of the complete respirator.
A respirator Quantitative Fit Test must be routinely carried out as outlined
above for each user of this respirator to determine or confirm the amount
of protection that the respirator provides.
Periodically repeating the fit testing is required to identify any physical
changes of the user (such as those listed in the DONNING PROCEDURES)
which could effect the fit of the facepiece.

Page 8 of 44P/N 595189-01 Rev A 4/10
6 A Guide to Industrial Respiratory Protection, HEW Publication Number (NIOSH)
76-189, John A. Pritchard (US. Dept. of Health Education and Welfare), p. 13.
WARNING
DO NOT USE OXYGEN! SUPPLYING THE
RESPIRATOR WITH OXYGEN MAY CAUSE
SICKNESS OR MAY CAUSE A FIRE OR EX-
PLOSION RESULTING IN SERIOUS INJURY
OR DEATH.
WARNING
THE AIR SUPPLY PRESSURE MUST REMAIN
BETWEEN 80 PSIG AND 115 PSIG WITH SUIT-
ABLE FLOW AT ALL TIMES DURING USE. IF
THE A IR S UPPLY DOE S NOT MAINT AI N
THESE REQUIREMENTS, THE RESPI-
RATOR MAY NOT PROVIDE ADEQUATE
PROTECTION FROM THE HAZARDOUS
ATMOSPHERE WHICH MAY RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
THE AIR SUPPLY MUST BE FREE OF CON-
DENSED MOISTURE. AIR REGULATORS, BY
THEIR NATURE, BECOME COLD DURING
USE AND CAN CAUSE MOISTURE IN THE
AIR SUPPLY TO FREEZE EVEN AT AMBIENT
TEMPERATURES WELL ABOVE 32° F / 0°
C. FROZEN MOISTURE IN THE AIR SUPPLY
MAY RESULT IN PARTIAL OR COMPLETE
FAILURE OF THE RESPIRATOR WHICH MAY
CAUSE SERIOUS INJURY OR DEATH.
AIR SUPPLY SYSTEM REQUIREMENTS
When the respirator is used as a Type C supplied air respirator IT
IS THE RESPONSIBILITY OF THE ORGANIZED RESPIRATORY
PROGRAM UNDER WHICH THE RESPIRATOR IS USED TO PRO-
VIDE A SUPPLY OF AIR THAT IS KNOWN TO BE CLEAN AND
SAFE FOR BREATHING AND TO ENSURE THAT ALL OTHER
REQUIREMENTS OF THE BREATHING AIR SUPPLY SYSTEM
STATED BELOW ARE MET.
To use the SKA-PAK AT combination respirator as a Type C supplied-
air respirator, it must be connected to a suitable supply of clean
breathing air through one or more segments of air supply hose. The
air supply system must supply air containing no less than 19.5 percent
oxygen and meeting the Grade “D” requirements of the Compressed
Gas Association (CGA) Commodity Specification for Air G–7.1 avail-
able from the CGA, Inc. 1235 Jefferson Davis Highway, Arlington,
Virginia, 22202.
In addition, the air must be dry, TO A DEW POINT OF -65°F / -54°C
OR LOWER. If the breathing air is not dry, water may condense on the
inside of the air supply lines or inside the respirator. In temperatures
at or below freezing, +32°F / 0°C, the condensation may freeze inside
the air supply lines or inside the respirator, possibly causing the flow
of breathing air to be reduced or to stop completely.
NOTE
THE AIR USED IN THE AIR SUPPLY CYLINDER ON THE RESPIRA-
TOR IS ALSO REQUIRED TO BE DRY TO A DEW POINT OF -65°F
/ -54°C OR LOWER.
The user’s breathing air volume requirement will vary depending on
the activity being performed. The volume of air needed, expressed in
liters per minute (lpm) at 1 atmosphere pressure, may range from less
than 20 lpm when at rest to over 60 lpm during heavy work.6
The air supply system must have the capacity to meet the user’s
volume requirement for respiration while maintaining the required
supply pressure of no less than 60 psig and no more than 125 psig
at the point of attachment of the respirator airline connection hose
to the air supply system. If the pressure in the air supply system
can exceed 125 psig, the air supply system shall be equipped with
a pressure-release mechanism that will prevent the pressure at
the point of attachment of the hose to the air supply system from
exceeding 125 psig.
The coupling installed on the air supply system must match both the coupling
installed on the supply hose and the coupling installed on the airline connec-
tion hose. The correct coupling must be directly installed on the air supply
system. Adapters shall not be used. The couplings and fittings that
mate with the couplings used on SCOTT air supply hose are available
from SCOTT or from the coupling manufacturer. To determine what
couplings are required, locate the SCOTT part number stamped on
the end of the Airline Connection Hose Assembly located in the waist
belt of the respirator. Refer to Table 2 on Page 29 of this instruction
to determine the manufacturer and series number of the couplings.
The SKA-PAK PLUS combination respirator is NIOSH certified only
when used with one of the types of hose with which it has been tested
and approved. The types of hose are:
SCOTT 30010-Series air supply hose
• SCOTT 26370-Series air supply hose
• SCOTT 200820-Series air supply hose
• SCOTT 803904-01 air supply hose.
• SCOTT 30020-Series air supply hose and
• SCOTT 26369-Series air supply hose

Page 9 of 44 P/N 595189-01 Rev A 4/10
7Hansen is a registered trademark of Tuthill Corporation.
8Foster is a registered trademark of Foster Manufacturing Co., Inc.
9Schrader is a registered trademark of Scovill, Inc.
10 Cejn is a registered trademark of Cejn AB
Single Plug Version Dual Plug Version
AIRLINE CONNECTION HOSES
FIGURE 1
WARNING
DO NOT USE OTHER HOSES, COUPLINGS
OR ADAPTERS TO ATTACH INCOMPATIBLE
COMPONENTS TO THE RESPIRATOR. IN-
COMPATIBLE COMPONENTS MAY REDUCE
THE ABILITY OF THE RESPIRATOR TO SUP-
PLY AIR AND MAY EXPOSE THE USER TO
THE HAZARDOUS ATMOSPHERE WHICH
COULD RESULT IN SERIOUS INJURY OR
DEATH.
WARNING
THE USER OF THIS RESPIRATOR MAY HAVE
TO DISCONNECT THE HOSE COUPLING
SUDDENLY AND UNDER STRESSFUL CON-
DITIONS. THE USER MUST BE ABLE TO DIS-
CONNECT THE COUPLING UNDER THE CON-
DITIONS WHICH MAY BE ENCOUNTERED
DURING USE, FOR EXAMPLE, WITHOUT BE-
ING ABLE TO SEE THE COUPLING, WITH
GLOVES ON, WITH ONE HAND, ETC. FAIL-
URE TO ADEQUATELY TRAIN THE USER MAY
RESULT IN SERIOUS INJURY OR DEATH.
The 30010-Series, 26370-Series, 200820-Series, and 803904-01 air
supply hoses may be interchanged to supply a single SKA-PAK AT
respirator, and, except for these, different types of supply hose may
NOT be mixed.
The 30010 series hose utilize a Hansen7brass disconnect coupling.
The 26370 series hose utilizes a stainless steel Foster8disconnect
coupling. The 26369 series hose utilizes a stainless steel Hansen HK
disconnect coupling. The 30020 series hose utilizes a steel Schrader9
disconnect coupling. The 805659 series hose utilizes a brass Cejn10
disconnect coupling. One of these types of couplings is located on
the end of the airline connection hose and at the ends of each seg-
ment of air supply hose. Dual airline connection hoses terminate in
two couplings, both of which are of one of the above types.
The air supply hose segments must be directly coupled to the airline
connection hose at the waist belt of the respirator, to each other and
to the air supply system. Adapters shall not be used.
After determining which type of air supply hose and couplings are
used with your respirator, locate the appropriate section of Table 1 on
page 23 of this instruction sheet for detailed instructions on operating
the coupling and for limitations on air supply hose length and number
of segments allowed.
FIGURE 2

Page 10 of 44P/N 595189-01 Rev A 4/10
TABLE 1
LIMITATIONS AND OPERATING INSTRUCTIONS FOR SUPPLY HOSE
NOTE: THE AIR SUPPLY PRESSURE MUST BE MAINTAINED BETWEEN 80 PSIG AND 115 PSIG
WHILE FLOWING AT LEAST 200 LITERS PER MINUTE (LPM) TO EACH USER.
A B C A B C A B C A B C
HANSEN HK COUPLING
USED ON 26369
SERIES
FOSTER COUPLING
USED ON 26370
SERIES
SCHRADER COUPLING
USED ON 30020
SERIES
HANSEN COUPLING
USED ON 30010 SERIES
FIGURE 3
COUPLINGS USED ON SUPPLY HOSES
A B C
CEJN COUPLING
USED ON 805659
SERIES
WARNING
THE USER OF THIS RESPIRATOR MAY HAVE TO DISCONNECT THE HOSE COUPLING SUDDENLY AND UNDER
STRESSFUL CONDITIONS. THE USER MUST BE ABLE TO DISCONNECT THE COUPLING UNDER THE CONDI-
TIONS WHICH MAY BE ENCOUNTERED DURING USE, FOR EXAMPLE, WITHOUT BEING ABLE TO SEE THE
COUPLING, WITH GLOVES ON, WITH ONE HAND, ETC. FAILURE OF THE USER TO ADEQUATELY PERFORM
THESE TASKS UNDER STRESSFUL CONDITIONS MAY RESULT IN SERIOUS INJURY OR DEATH.
INSTRUCTIONS FOR OPERATION OF COUPLINGS
Note: The user shall practice and be able to discon-
nect the couplings quickly in an emergency situation.
1. To connect the coupling, rotate socket sleeve "B" until
the alignment notch in the sleeve is in line with align-
ment peg in body "A".
2. Slide sleeve "B" toward the supply hose (away from plug
"C") and insert plug "C" into socket "A". Release sleeve
"B" while pushing the plug into the socket until engaged,
as evidenced by a "click". Test for positive engagement
by tugging on the plug.
3. Rotate sleeve "B" one-quarter to one-half turn to lock
the plug against accidental release.
4. To disconnect the coupling, realign sleeve "B" with the
body of socket "A" as described in step 1. Slide sleeve
"B" away from the body (toward the supply hose) to
release the plug fitting from the socket.
IF IT IS NOT PRACTICAL TO SEE THE ALIGNMENT
NOTCH IN THE SLEEVE, USE THE FOLLOWING
PROCEDURE TO DISCONNECT THE COUPLING:
1. Grasp sleeve "B" with the right hand.
2. Simultaneously rotate and push the sleeve away from the
plug until the alignment notch in the sleeve lines up with
the alignment peg in the body and the socket separates
from the plug.
1The female connectors on all supply hose series are checked to stop the flow of air when they are disconnected. Both male and
female connectors are checked on 26369 series supply hose.
2"0" feet = direct connection to air supply source.
3Segments of supply hose are commonly available in 25 ft, 50 ft, 75 ft, and 100 ft length segments.
Supply Hose1
30010 Series with
brass Hansen cou-
plings
26369 Series
with stainless steel
Hansen HK
couplings
30020 Series with
steel Schrader cou-
plings
805659 Series with
brass CEJN cou-
plings
0 to 300
0 to 300
0 to 150
0 to 300
0 to 300
1. Insert plug fitting "C" into socket "A" and continue
pushing until it is engaged as evidenced by a "click".
2. Test for positive engagement by tugging on the plug.
3. Disconnect the coupling by pushing in on plug "C" while
pulling back on sleeve "B". Plug "C" will separate.
1. Insert plug fitting "C" into socket "A" and continue
pushing until it is engaged as evidenced by a "click".
2. Test for positive engagement by tugging on the plug.
3. Disconnect the coupling by rotating sleeve "B" 1/8
turn in the clockwise direction as viewed from the
female end of socket "A".
Approved
Total
Lengths2(in ft)
Maximum Number
of Segments Ap-
proved 3
6
12
12
12
12
26370-Series or
200820-Series,
or 803904-01 Hose
with stainless steel
Foster couplings

Page 11 of 44 P/N 595189-01 Rev A 4/10
REPLACING THE AIRLINE CONNECTION HOSE
FIGURE 4
O-RING ON FITTING
O-RING ON CHECK
VALVE IN REDUCER
AIRLINE CONNECTION HOSE REPLACEMENT
To replace an airline connection hose with a different type of
Scott airline connection hose, remove the hose from the pressure
reducer by loosening the fitting on the end of the hose with a 3/4
inch open end wrench until it separates from the pressure reducer.
See FIGURE 4.
Inspect the airline connection hose to be installed to be certain that
the hose is dry, free from obstructions, that the threads on the end
fitting are not damaged and that the O-ring seal on the hose fitting
is present and in good condition. If the threads are damaged or if
the O-ring seal is missing or damaged, DO NOT USE THE AIRLINE
CONNECTION HOSE; remove the airline connection hose from service
and tag for repair by authorized personnel.
Inspect the O-ring in the reducer and replace if damaged. Before
installing hose, be sure the check valve is properly installed in the
reducer and the O-ring is placed on the check valve.
To install an airline connection hose, slide the end with the fitting
through the sleeve on the waist belt from the right side as worn and
thread the fitting into the pressure reducer using moderate force.
NOTES: 11 SCOTT Part Number stamped into end of hose. See FIGURE 2.
12 SCOTT Part Number stamped into hose within 6 inches of either end.
13 Specify silicone seals if ordering couplings from the manufacturer.
14 Female connector with 1/4 inch male NPT inlet fitting.
15 Female connector with 1/4 inch female NPT inlet fitting.
TABLE 2
IDENTIFICATION OF SUPPLY HOSE AND SUPPLY HOSE COUPLINGS
SCOTT Airline Connection
Hose Assy Number11
Corresponding SCOTT
Supply Hose Required12
Type of coupling required from
coupling manufacturer for connec-
tion to air supply system
SEE WARNING BELOW
Air Supply Couplings
Available from SCOTT
804305-01 Single Plug
or
804319-01 Dual Plug
804305-02 Single Plug
or
804319-02 Dual Plug
804305-03 Single Plug
or
804319-03 Dual Plug
30010-SERIES, 26370-SERIES,
200820-SERIES or 803904-01
30020-Series
26369-Series
804305-07 Single Plug 805659-Series
Hansen 3000 Series13
or Foster 3 Series Manual
Schrader Standard
Twist Lock
Hansen 2HK Series
Cejn 342 Series
Part No. 19458-0014
Part No. 19889-005
Part No. 6831-0014
Part No. 55065-0015
Part No. 1000800515
Not Available
WARNING
DO NOT ATTEMPT TO CHANGE ANY FIT-
TINGS ON THE RESPIRATOR OR RESPIRA-
TOR SUPPLY HOSE. THE USE OF FITTINGS,
CONNECTIONS OR ADAPTERS NOT SUP-
PLIED BY SCOTT MAY VOID THE WARRAN-
TY, VOID NIOSH CERTIFICATION AND MAY
ADVERSELY EFFECT RESPIRATOR PERFOR-
MANCE AND ENDANGER THE RESPIRATOR
USER RESULTING IN SERIOUS INJURY OR
DEATH.

Page 12 of 44P/N 595189-01 Rev A 4/10
WARNING
BATTERY MUST ONLY BE CHANGED IN AN AREA
KNOWN TO BE NONFLAMMABLE. CHANGING
THE BATTERY IN A FLAMMABLE ATMOSPHERE
MAY CAUSE AN IGNITION WHICH COULD RE-
SULT IN SERIOUS INJURY OR DEATH.
FIGURE 5A FIGURE 5B
COVER
GASKET
PLUS AND
MINUS
EMBOSSED
IN COVER
BATTERY
ELECTRONIC ALARM BATTERY REPLACEMENT
The ELECTRONIC alarm requires a single 9 volt battery for operation.
The LOW BATTERY YELLOW light on the ELECTRONIC alarm will
appear when the battery must be replaced. When the LOW BATTERY
YELLOW light begins flashing, the battery has sufficient power to
continue normal operation for a period of time longer than the longest
duration cylinder that may be installed on the SKA-PAK AT. However,
after use of the respirator is terminated, the battery must be replaced
before respirator use is resumed. Once the LOW BATTERY YELLOW
light has been activated, the ELECTRONIC alarm will not initialize on
start-up with a depleted battery and the RED warning light will not op-
erate. Beyond a point, the YELLOW LIGHT will glow instead of flash.
Replace the battery as follows:
1. Verify that the cylinder valve is closed and open the purge valve
to relieve any pressure in the system. Close the purge valve.
2. Unscrew counterclockwise the single knurled screw on the cover
of the ELECTRONIC alarm housing.
3. Open the housing cover and pull the cover gasket away from the
cover to reveal the battery. See FIGURE 5A.
4. Remove the old battery by lifting the bottom first.
5. Replace with one of the following 9 volt batteries: Energizer
Alkaline No. 522 or EN22, Duracell Alkaline No. PC1604 or
MN1604, or for increased service life use Ultralife Lithium Bat-
tery No. U9VL.
Be sure battery is properly oriented with the + pole of the battery
(the smaller male snap connector) positioned against the battery
contact labeled + as shown in FIGURE 5B. As soon as the battery
makes contact, the RED and YELLOW lights will flash alternately
as they do for the initialization sequence. IF THE BATTERY IS
INSTALLED INCORRECTLY, NEITHER LIGHT WILL FLASH.
6. With a fresh battery installed, fit the cover gasket back around
the inside of the cover.
7. Close the cover and thread the knurled screw clockwise back in
to secure the cover to the housing. Screw should be finger tight
with the cover fully closed and the gasket evenly compressed.
8. Test the operation of the ELECTRONIC alarm as outlined in
the REGULAR OPERATIONAL INSPECTION section of this
instruction.
9. In the case of an inoperative or malfunctioning ELECTRONIC
alarm, respirator must be removed from service and sent to an
authorized service center for alarm repair or replacement. DO
NOT use a respirator with an inoperative or malfunctioning ELEC-
TRONIC alarm.
WARNING
REGULARLY INSPECT THE SKA-PAK AT
RESPIRATOR INCLUDING THE ELECTRONIC
ALARM AS DESCRIBED IN THIS INSTRUC-
TION. VERIFY THAT THE PROPER BATTER-
IES ARE USED AND THAT THERE IS NO
DAMAGE TO OR MODIFICATION OF THE
UNIT THAT WOULD IMPAIR THE INTRINSIC
SAFETY. IF THE SKA-PAK AT IS USED IN AN
EXPLOSIVE OR FLAMMABLE ATMOSPHERE,
FAILURE TO CORRECT CONDITIONS THAT
MAY IMPAIR THE INTRINSIC SAFETY OF
THE EQUIPMENT MAY LEAD TO A FIRE OR
AN EXPLOSION WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.

Page 13 of 44 P/N 595189-01 Rev A 4/10
WARNING
DAMAGED CYLINDERS MAY SUDDENLY
LEAK OR RUPTURE IF LEFT CHARGED WITH
COMPRESSED AIR. FAILURE TO INSPECT
FOR DAMAGE AND TO EMPTY THE AIR
FROM DAMAGED CYLINDERS MAY RESULT
IN SERIOUS INJURY OR DEATH.
WARNING
THIS INSPECTION PROCEDURE REQUIRES
USING A SMALL AMOUNT OF AIR FROM THE
SELF-CONTAINED AIR SUPPLY CYLINDER
ON EACH INSPECTION. IF THE CYLINDER
GAUGE IS NO LONGER READING "FULL",
THE CYLINDER MUST BE RECHARGED TO
ITS FULL CONDITION BEFORE RETURNING
TO SERVICE. USE OF A CYLINDER AIR SUP-
PLY THAT IS LESS THAN FULL MAY RESULT
IN REDUCED DURATION OF THE RESPIRA-
TOR AND MAY RESULT IN SUDDEN TERMI-
NATION OF BREATHING AIR WHICH COULD
CAUSE SERIOUS INJURY OR DEATH.
WARNING
FOLLOW THE REGULAR OPERATIONAL IN-
SPECTION PROCEDURE EXACTLY. IF THE
PURGE DOES NOT ACTUATE AS DESCRIBED
IN THIS INSTRUCTION OR ANY OTHER OP-
ERATIONAL MALFUNCTION IS NOTED, DO
NOT USE THE RESPIRATOR. REMOVE THE
RESPIRATOR FROM SERVICE AND TAG IT
FOR REPAIR BY AUTHORIZED PERSON-
NEL. FAILURE TO PROPERLY IDENTIFY
MALFUNCTIONS MAY RESULT IN SERIOUS
INJURY OR DEATH.
WARNING
REGULARLY INSPECT THE SKA-PAK AT
RESPIRATOR INCLUDING THE ELECTRONIC
ALARM AS DESCRIBED IN THIS INSTRUC-
TION. VERIFY THAT THE PROPER BATTER-
IES ARE USED AND THAT THERE IS NO
DAMAGE TO OR MODIFICATION OF THE
UNIT THAT WOULD IMPAIR THE INTRINSIC
SAFETY. IF THE SKA-PAK AT IS USED IN AN
EXPLOSIVE OR FLAMMABLE ATMOSPHERE,
FAILURE TO CORRECT CONDITIONS THAT
MAY IMPAIR THE INTRINSIC SAFETY OF
THE EQUIPMENT MAY LEAD TO A FIRE OR
AN EXPLOSION WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.
REGULAR OPERATIONAL INSPECTION
The following procedure shall be used when you first receive the res-
pirator and for scheduled inspection of the respirator. All respirators
shall be inspected after each use. A respirator not routinely used but
kept for emergency use shall be inspected at least monthly. If dam-
age or discrepancies are noted during the inspection of the respirator,
remove the respirator from service and tag for repair by authorized
personnel.
Ensure that the cylinder valve is closed (push in and rotate the cyl-
inder valve knob full clockwise).
To vent any trapped air in the system, open the purge valve by rotat-
ing the red knob on the breathing regulator to the full counterclock-
wise position. Any trapped air will flow from the regulator. Close the
purge valve by rotating the knob to the full clockwise position when
air flow stops.
CYLINDER INSPECTION
NOTE
IT IS THE RESPONSIBILITY OF THE USER TO ENSURE THAT ALL
DOT REQUIREMENTS FOR THE SELF-CONTAINED AIR SUPPLY
CYLINDER ON THIS RESPIRATOR ARE MET AND MAINTAINED.
1. Check the latest cylinder hydrostatic test date to ensure it is
current. All cylinders used with SCOTT self-contained breathing
apparatus must be visually inspected regularly and hydrostatically
tested by a licensed cylinder retester in accordance with the ap-
propriate US Department of Transportation (DOT) specification
or the applicable DOT exemption. For a complete listing of retest
date requirements, refer to the current revision of Safety Pre-
cautions for Air-Pak Cylinders, Scott P/N 89080-01, available on
request from Scott Health and Safety. Composite cylinders (those
cylinders utilizing fiber over wrap) must be tested in accordance
with the DOT exemption status up to the maximum life of fiber
overwrapped cylinders which, at the time of the publication of
this instruction, is 15 years from the date of manufacture. The
date of manufacture marked on the cylinder is also the date of
the first hydrostatic test. It is the responsibility of your organized
respiratory protection program to arrange for visual inspection and
hydrostatic testing of cylinders by a licensed retester.
2. Visually inspect cylinder and valve assembly for physical dam-
age such as dents or gouges in metal or in composite wrapping.
Cylinders which show physical damage or exposure to high heat
or flame, such as paint turned brown or black, decals charred
or missing, pressure gauge lens melted or elastomeric bumper
distorted, and cylinders which show evidence of exposure to
chemicals such as discoloration, cracks in the cylinder or the
composite wrapping, peeling of the outer layers of the composite
wrapping and/or bulging of the cylinder wall, shall be removed
from service and emptied of compressed air. Refer to current
applicable publications on compressed gas cylinder inspection
available from Compressed Gas Association Inc. (703-413-4341),
1725 Jefferson Davis Hwy., #1004, Arlington, VA 22202.
3. Check the cylinder gauge for a “FULL” indication. If the cylinder
pressure is less than “FULL,” replace the cylinder with a fully
charged cylinder or have the cylinder charged to the full condi-
tion.
Proceed to HARNESS INSPECTION.
REGULAR OPERATIONAL INSPECTION
CONTINUED ON NEXT PAGE...

Page 14 of 44P/N 595189-01 Rev A 4/10
FIGURE 6A
SKA-PAK PLUS HARNESS ATTACHMENTS
REGULAR OPERATIONAL INSPECTION CONTINUED...
FEMALE BUCKLE
STANDARD HARNESS
FEMALE BUCKLE
FULL BODY HARNESS
HARNESS INSPECTION
1. Inspect the harness as follows:
a) Inspect the Standard Harness for frayed webbing or damaged
buckles. Make sure that all belts and straps are assembled
properly as shown on Front Cover. Adjust the straps to approxi-
mately the full out position. Adjust the shoulder strap so that it
holds the waist belt approximately at waist level.
b). Inspect the Full Body Harness for frayed webbing or damaged
buckles. Make sure that the Full Body Harness is assembled
properly as shown on Page 4 and referenced in the DBI/SALA
full body harness user instructions (SCOTT P/N 89497-01) pro-
vided with the harness. If any damage is found, do not use the
harness.
NOTE
IF THE FULL BODY HARNESS HAS BEEN SUBJECTED TO FALL AR-
REST OR IMPACT FORCES, IT MUST BE IMMEDIATELY REMOVED
FROM SERVICE AND DESTROYED.
2. Inspect the cylinder attachment to the harness as follows:
a) If the SKA-PAK AT is fitted to a SKA-PAK PLUS harness (either
a standard harness or a Full Body Harness), inspect the valve
hanger bracket and the female buckle. The valve hanger bracket
should be securely engaged in the female buckle and should
not lift out with normal handling. To remove the air supply cyl-
inder from the harness, press the release tab at the bottom of
the hanger bracket away from the cylinder valve and lift the air
supply cylinder. See FIGURE 6A.
VALVE HANGER BRACKET
PUSH TAB
TO
RELEASE

Page 15 of 44 P/N 595189-01 Rev A 4/10
b) If the SKA-PAK AT has been retro-fitted to an existing SKA-PAK
harness, verify that the cylinder and valve assembly is properly
fitted to the harness. Inspect the cylinder clamps. Both clamps
must be tight and hold the cylinder to the harness securely.
Tighten as necessary. See FIGURE 6B.
FIGURE 6B
SKA-PAK HARNESS ATTACHMENTS
REGULAR OPERATIONAL INSPECTION
CONTINUED ON NEXT PAGE...
Proceed to PRESSURE REDUCER AND AIR PATH INSPECTION.

Page 16 of 44P/N 595189-01 Rev A 4/10
REGULAR OPERATIONAL INSPECTION CONTINUED...
FIGURE 7
COUPLING GASKET
PRESSURE
REDUCING
REGULATOR
COUPLING
GASKET
PRESSURE REDUCER AND AIR PATH INSPECTION
1. Inspect the gauge and ELECTRONIC alarm for damage or modi-
fications that may impair the intrinsic safety. Verify that a fresh
battery is installed in the ELECTRONIC alarm. The ELECTRONIC
alarm requires one 9V battery for operation. See the ELECTRONIC
ALARM BATTERY REPLACEMENT section of this instruction.
2. Inspect the pressure reducer for exterior damage.
3. Inspect the cylinder valve outlet threads and the coupling gasket.
The gasket is located on the nipple coupling that connects the
pressure reducer to the cylinder valve. To expose the threads and
the gasket for inspection, grasp the hand wheel coupling on the
pressure reducer and turn the hand wheel counterclockwise until
the pressure reducer separates from the cylinder valve. Inspect the
cylinder valve outlet for bent or damaged threads. If the gasket is
present and in good condition and the valve outlet is undamaged,
thread the coupling back onto the cylinder valve using hand tight
pressure. See FIGURE 7.
CAUTION
WRENCHES SHALL NOT BE USED TO TIGHT-
EN THE HOSE COUPLING. OVER TIGHTEN-
ING THE HOSE COUPLING MAY DAMAGE
THE NIPPLE SEAL.
WARNING
A DAMAGED OR MISSING COUPLING GAS-
KET MAY CAUSE AIR LEAKAGE THAT MAY
REDUCE THE DURATION OF USE WHICH
COULD RESULT IN CIRCUMSTANCES
THAT COULD CAUSE SERIOUS INJURY OR
DEATH.

Page 17 of 44 P/N 595189-01 Rev A 4/10
WARNING
CLOSE THE PURGE VALVE WHEN NOT IN
USE. FAILURE TO CLOSE THE PURGE VALVE
WILL EMPTY THE SELF-CONTAINED AIR
SUPPLY IN A VERY SHORT TIME, POSSIBLY
LESS THAN 2 MINUTES WHICH WILL RE-
DUCE THE DURATION OF USE AND COULD
RESULT IN CIRCUMSTANCES THAT COULD
CAUSE SERIOUS INJURY OR DEATH.
WARNING
FAILURE TO CHECK ENGAGEMENT OF THE
COUPLING AS DESCRIBED MAY LEAD TO
HOSE SEPARATION AND LOSS OF BREATH-
ING AIR RESULTING IN SERIOUS INJURY
OR DEATH.
QUICK DISCONNECT FITTING
FIGURE 8
A B
A B
PULL SLEEVE
BACK
PUSH PLUG IN
4. Inspect the airline connection hose for cuts or damage. Check that
it is installed tightly into the pressure reducing regulator at one
end and that the plug is free from dirt accumulations at the other
end; check both plugs on dual airline connection hoses. Clean as
required. Care must be taken to remove any dirt accumulations
or obstructions from the plug without allowing them to enter the
airline connection hose. Inspect the body and plugs at the end of
dual airline connection hoses for damage and ensure the plugs
are threaded tightly into the body. Inspect the dust cap on dual
airline connection hoses for damage and install it on one of the
plugs.
5. Inspect the air supply hose segments for cuts and signs of contami-
nation. Check the end fittings of the hose for dirt accumulations or
obstructions. Clean the fittings as required. Care must be taken
to remove any dirt accumulations or obstructions from the fittings
without allowing them to enter the air supply hose.
6. Inspect the hose assembly that connects the pressure reducer to
the breathing regulator. Be sure that the hose is undamaged and
connected tightly to the pressure reducer.
7. If the hose to the facepiece mounted breathing regulator is
equipped with a quick disconnect check that the quick discon-
nect is engaged properly. See FIGURE 8. The quick disconnect
operates as follows:
a) While pushing the plug “A” into the socket, pull the locking sleeve
“B” back toward the guard. The plug “A” will separate.
b) To reconnect, push plug “A” into socket until the locking sleeve
“B” pops forward. Test for proper engagement by tugging on the
coupling.
8. Check that the breathing regulator purge valve (red knob on regu-
lator) is closed (knob turned fully clockwise and pointer on knob
upward).
9. Inspect the breathing regulator for exterior damage. Verify that
the breathing regulator is clean.
10. Check that the breathing regulator is installed properly into the
facepiece. The retaining latch on the breathing regulator (located
opposite the purge valve) shall be engaged with the notch on the
right hand side of the facepiece as worn.
Proceed to INSPECTION OF THE FACEPIECE.
WARNING
DIRT OR FOREIGN MATERIAL IN THE
AIRLINE HOSE OR CONNECTION PLUG
M A Y C A U S E P A R T I A L O R C O M P L E T E
FAI LURE OF T HE RESPIR ATOR IN H OSE
LINE OPERATION OR IN SELF-CONTAINED
OPERATION. FAILURE TO INSPECT THE
AIRLINE CONNECTION COULD RESULT
IN SERIOUS INJURY OR DEATH.
REGULAR OPERATIONAL INSPECTION
CONTINUED ON NEXT PAGE...

Page 18 of 44P/N 595189-01 Rev A 4/10
REGULAR OPERATIONAL INSPECTION CONTINUED...
FIGURE 9
FACEPIECE WITH
NO VOICEMITTERS
FACEPIECE WITH
VOICEMITTERS
VOICEMITTERS
INSPECTION OF THE FACEPIECE
Examine the facepiece assembly for damaged or worn components. The
facepiece must be complete and in serviceable condition with no worn,
loose, or damaged components.
• The AV-2000 style facepieces include the AV-2000, the Weld-O-
Vista, and the Scott-O-Vista (the Scott-O-Vista does not have
voicemitters).
• The AV-3000 style facepieces include the AV-3000 and the AV-
3000 SureSeal.
Inspect the facepiece as follows:
1. Inspect the facepiece seal and other rubber components for de-
formation, wear, damage, or cracks.
2. Inspect the lens for cracks, gouges, scratches, or any condition
that could impair the operation of the facepiece or the user’s vi-
sion.
3. Inspect the lens frame or bezel for damage such as cracks or
distortion.
4. Check that all lens frame retainers or bezel screws are present
and installed correctly.
5. Check that all harness anchors are present and operating
properly.
6. Inspect the head harness for correct installation with all straps
oriented correctly.
7. Inspect the head harness for damage or worn components.
8. Inspect the voicemitters for dents or damage. Verify that the voicemit-
ters are properly installed and secure in the voicemitter ducts.

Page 19 of 44 P/N 595189-01 Rev A 4/10
REGULAR OPERATIONAL INSPECTION
CONTINUED ON NEXT PAGE...
CAUTION
IF THE NOSE CUP IS REMOVED FOR INSPEC-
TION, MAKE CERTAIN IT IS REASSEMBLED
CORRECTLY FOR THE MODEL FACEPIECE
AND STYLE OF NOSE CUP.
FIGURE 10
Checking Voicemitter Ducts
AV-3000 FACEPIECES ONLY
FIGURE 11
BLACK Nose Cup
BEHIND Face Seal
FIGURE 12
GRAY Nose Cup
IN FRONT OF Face Seal
BLACK
BEHIND
FACE SEAL
GRAY
IN FRONT OF
FACE SEAL
AV-2000 STYLE FACEPIECES ONLY
AV-2000 Nose Cup
Always BEHIND the Face Seal
FIGURE 13
9. Inspect the nose cup for cuts or damage. Also look for any signs
of damage to the facepiece port side of the nose cup where the
regulator attaches.
10. Check that the nose cup is
properly seated between the
flanges of the voicemitter
ducts. See FIGURE 10.
11. All SCOTT facepieces used with this respirator may be fitted with
a nose cup. Verify that the Nose Cup is properly installed for the
model of facepiece being used. A Nose Cup is standard on the
SCOTT AV-2000®, Weld-O-Vista, and AV-3000® full facepieces
and optional on the SCOTT-O-VISTA® full facepiece.
a) SCOTT AV-3000 and AV-3000 SureSeal Facepieces are avail-
able with two different styles of nose cup: a BLACK Nose Cup
which fits behind the face seal, and a GRAY Nose Cup which
fits in front of the face seal. The BLACK Nose cup must be fit-
ted BEHIND the Face Seal as shown in FIGURE 11. The GRAY
Nose Cup must be fitted IN FRONT OF the Face Seal as shown
in FIGURE 12.
b) The AV-2000, the Weld-O-Vista, and the SCOTT-O-VISTA, the
Nose Cup always goes BEHIND the face seal REGARDLESS
of the color of the nose cup. See FIGURE 13.
12. Verify that the facepiece is clean.
13. Adjust the head straps to the full outward position.
Proceed to OPERATIONAL TESTING OF THE RESPIRATOR.
WARNING
TO MAINTAIN NIOSH APPROVAL, AN AV-
3000 FACEPIECE EQUIPPED WITH A SURE-
SEAL FACESEAL P/N 31001738 (SMALL),
P/N 31001739 (MEDIUM), OR P/N 31001740
(LARGE) MUST BE USED ONLY W I T H
GREY NOSE CUP P/N 31001043 (SMALL),
P/N 31001044 (MEDIUM), OR P/N 31001045
(LARGE). USE OF A NON-APPROVED CON-
FIGURATION IN A HAZARDOUS ATMO-
SPHERE MAY RESULT IN SERIOUS INJURY
OR DEATH.

Page 20 of 44P/N 595189-01 Rev A 4/10
WARNING
AIR FLOW FROM THE AIRLINE CONNEC-
TION HOSE WILL CONSUME AIR FROM THE
SELF-CONTAINED AIR SUPPLY AND CAN
SIGNIFICANTLY SHORTEN THE DURATION
OF THE RESPIRATOR. FAILURE TO PRO-
VIDE A FULL CYLINDER WITH THE SKA-PAK
AT MAY LEAD TO CIRCUMSTANCES THAT
COULD RESULT IN SERIOUS INJURY OR
DEATH.
WARNING
NEVER PLACE A SKA-PAK AT RESPIRA-
TOR IN SERVICE IF THE CYLINDER GAUGE
INDICATES LESS THAN "FULL." AIR LOSS
FROM THE SELF-CONTAINED AIR SUPPLY
CYLINDER DUE TO INSPECTION AND TEST-
ING CAN SIGNIFICANTLY SHORTEN THE DU-
RATION OF THE RESPIRATOR. FAILURE TO
PROVIDE A FULL CYLINDER WITH THE SKA-
PAK AT MAY LEAD TO CIRCUMSTANCES
THAT COULD RESULT IN SERIOUS INJURY
OR DEATH.
WARNING
IF THE VIBRALERT END OF SERVICE TIME
INDICATOR DOES NOT ACTUATE AS DE-
SCRIBED, DO NOT USE THE RESPIRATOR.
REMOVE THE RESPIRATOR FROM SERVICE
AND TAG FOR REPAIR BY AUTHORIZED
PERSONNEL. USE OF A RESPIRATOR WITH-
OUT A PROPERLY OPERATING VIBRALERT
END OF SERVICE TIME INDICATOR MAY
RESULT IN SERIOUS INJURY OR DEATH.
1. Don the facepiece properly (see donning procedures under USE
OF THE RESPIRATOR) or hold the facepiece tightly to the face
to effect a good seal. Inhale slightly and hold breath. A negative
pressure (suction) shall be created, pulling the facepiece toward
the face. Hold breath for 5 to 10 seconds. If leakage is noted,
remove the respirator from service and tag for repair by authorized
personnel.
2. Briefly remove the facepiece (see doffing procedures under TERMI-
NATION OF USE) to take a breath if necessary. Don the facepiece
or hold the facepiece tightly to the face. Depress the air-saver/
donning switch fully and release. Open the cylinder valve by turn-
ing the valve knob counterclockwise fully. The VIBRALERT will
actuate and the ELECTRONIC alarm will flash for approximately
five seconds to initialize. No air flow shall be detected at this time.
Inhale sharply to start the flow of air, then take one breath and
hold.
NOTE
IF THE PURGE VALVE IS ADJUSTED TO PRODUCE A FLOW, IT
MAY NOT BE POSSIBLE TO RESET THE AIR-SAVER/DONNING
SWITCH BY INHALING; CLOSE THE PURGE VALVE AND REPEAT
THE TEST.
Air shall flow freely into the facepiece during inhalation and stop
when inhalation ceases. VIBRALERT shall actuate. Hold breath for
5 to 10 seconds. If airflow continues after inhalation has ceased,
recheck the fit of the facepiece (see Step 1). If airflow continues
after checking the fit, remove the respirator from service and tag
for repair by authorized personnel. Exhale into the facepiece and
take a second breath. Air shall leave the facepiece through the
exhalation valve during exhalation and fresh air shall flow into the
facepiece on inhalation. Depress the air saver switch fully and re-
lease. Doff the facepiece. No air shall flow from the facepiece.
3. With the cylinder valve open and the air-saver/donning switch
depressed, check the open end of the fitting on the airline con-
nection hose for any sign of leakage. If leakage or if airflow from
the airline connection hose can be detected from the fitting, DO
NOT USE THE Respirator; remove the respirator from service and
tag for repair by authorized personnel.
On respirators equipped with a dual airline connection hose, check
both plugs for leakage. If leakage or airflow can be detected from
the fitting, DO NOT USE THE RESPIRATOR; remove the respira-
tor from service and tag for repair by authorized personnel.
Close the cylinder valve by pushing in on the cylinder valve knob
while turning it fully clockwise. Vent any trapped air in the respi-
rator by opening the purge valve momentarily. Close the purge
valve when air flow and VIBRALERT stop. The ELECTRONIC
alarm shall flash until air is purged from the system. Check the
gauge on the air cylinder to be certain the cylinder still indicates
“FULL.”
OPERATIONAL TESTING OF THE RESPIRATOR
REGULAR OPERATIONAL INSPECTION CONTINUED...