Scott Safety RAS User manual

RAS
2026506 A
02.2013 0086

CONTENTS
WARNINGS 1
INTRODUCTION 2
APPROVALS 2
LIMITATIONS OF USE 2
BREATHABLE AIR 2
COMPRESSED AIR AIRLINE SUPPLIES 2
PERSONNEL TRAINING 2
SERVICING 2
SPARE PARTS AND ACCESSORIES 3
WARRANTY 3
TECHNICAL DESCRIPTION 3
GENERAL 3
FILTERS 3
DEMAND VALVE HOSE 3
DEMAND VALVE (DV) 3
PANASEAL / VISION 3 / PROMASK FACEMASK 3
BANDOLIER AND WAISTBELT HARNESS 4
PRE-USE AND MONTHLY CHECKS 4
INSPECTION 4
BANDOLIER WAISTBELT 5
DV & FACEMASKS 5
AIRLINE CHECKS 5
DONNING PROCEDURES 6
ATTACHING THE FILTER 6
DONNING THE BANDOLIER 6
FACEMASKS 6
NEGATIVE PRESSURE TEST 7
POSITIVE PRESSURE TEST 7
FACE SEAL TEST 8
DEMAND VALVE TEST 8
AIRLINE SUPPLY 8
WHILE IN USE 8
DOFFING 9
AFTER USE 10
CLEANING 10
CHECK APPARATUS 10
STORAGE 10
SCHEDULED MAINTENANCE 10
MONTHLY 10
ANNUALLY 10

RAS1
PRE-OPERATIONAL WARNINGS
Please Read Carefully and Fully Understand
This manual is intended for use by personnel who have been trained in the use and care of
compressed-air breathing apparatus, and MUST NOT be used as a self-teaching guide by
untrained users. Failure to understand or adhere to the RAS user instructions may result in injury
or death.
Scott Safety has taken great care to ensure that the information in this manual is accurate,
complete and clear. However, Training and Technical Support Services will be pleased to clarify
any points in the manual and answer questions on Scott Safety breathing apparatus.
The following warnings are in accordance with certifying authority requirements and apply to
the use of breathing apparatus in general:
Breathing apparatus users must be fully trained in the use and care of self-contained,
compressed-air breathing apparatus.
Ensure that the selection of the apparatus type is sufficient for the tasks being undertaken
and the hazards likely to be encountered. Please refer to National Regulations for guidance.
Adequate protection may not be provided in certain highly hazardous atmospheres.
The apparatus must be tested and serviced in accordance with Section - Scheduled
Maintenance and the notes in Section - Personnel Training and Servicing.
The quality of air used to supply and charge breathing apparatus must meet the
requirements of EN 12021:1999. See Section - Introduction for details.
Ensure that a good seal can be obtained between the face and facemask. The wearing of
beards, side-burns or spectacles may adversely affect the sealing of a facemask to the
wearer’s face.
The apparatus is not designed for use underwater.
This apparatus does not protect against carbon dioxide, carbon monoxide or other toxic
gases and vapours.
RAS is not approved for use in flammable or explosive atmospheres.
DISCLAIMER
Failure to comply with these instructions or misuse of the apparatus may result in: death, injury
or material damage, and invalidate any warranty or insurance claims.
COPYRIGHT
This manual must not be copied in part or whole, or used for purposes other than its intended
purpose without the written permission of Scott Safety.

2RAS
INTRODUCTION
APPROVALS
RAS apparatus is ‘CE’ marked in accordance
with EEC Directive EC/686/1986.
It is approved to European Standard EN
14593-1:2005 (Respiratory Protective Devices -
Compressed air line breathing apparatus with
demand valve).
Facemasks are approved to EN136:1998.
Scott Safety is quality assurance approved to:
ISO 9001.
Notified Body
BSI (0086)
Kitemark Court,
Davy Ave,
Knowlhill,
Milton Keynes,
MK5 8PP.
England
LIMITATIONS OF USE
RAS must only to be used with Scott Safety
breathing apparatus Facemasks.
Only to be used by competent personnel
trained by Scott Safety Instructors, or their
approved agents.
DO NOT use with spectacle side arms, beards
(or other facial hair), or clothing that may
prevent the facemask forming a good seal with
the face.
BREATHABLE AIR
Air used to supply or charge breathing air may
be natural or synthetic and must comply with
EN 12021:1999.
COMPRESSED AIR AIRLINE
SUPPLIES
Air for use with compressed air airlines must
conform to EN12021:1999.
Airline pressure must be between 5.0 - 9.0 bar
(70 - 130psi). Airflow supply capacity for a
single airline is given in Table 1. Generally - each
additional wearer requires an extra 150 litres/
minute, each additional pair of wearers requires
300 L/min for one wearer and 450 L/min for
two wearers (see Table 1). All measurements
must be taken at the wearer end of the airline.
An airline flow tester (Article Number 1035978)
is available from Scott Safety.
Example: for 8 users (4 pairs) the recommended
flow is 4 x (300 + 150) = 1800 litres/minute.
Table 1 Wearer Air Consumption
No. of Wearers Airflow (L/min.)
1 300
2 450
3750
4 900
Airline hoses used with Scott Safety breathing
apparatus must be Scott Safety products,
approved to EN14593-1:2005.
PERSONNEL TRAINING
Personnel who use breathing apparatus must
be fully trained in accordance with Local
National Regulations and these instructions.
These instructions cannot replace an accredited
training course run by fully qualified instructors
in the proper and safe use of Scott Safety
breathing apparatus.
Contact Training & Technical Support Services
or a Scott Safety distributor for training
information.
Training & Technical Support Services,
Scott Safety,
Pimbo Road, West Pimbo,
Skelmersdale, Lancashire,
WN8 9RA, United Kingdom.
Tel: [phone]
Fax: [phone]
SERVICING
RAS must be serviced at scheduled intervals
by personnel who have completed a formal
training course and hold a current certificate
for the servicing and repair of Scott Safety
breathing apparatus. Details of the servicing
schedule are contained in the Scott Safety
RAS Service Manual, copies of which can only
be obtained by registered holders of a current
certificate.
Your distributor or Training and Technical
Support Services at Scott Safety will be
pleased to provide training course details and
quotes for service contracts.

RAS3
SPARE PARTS AND
ACCESSORIES
Customer Services provide an efficient,
friendly, customer contact point for ordering
new apparatus, spare parts and accessories.
The team can also provide general information
on Scott Safety products.
WARRANTY
The products manufactured at our factories in
Skelmersdale and Vaasa carry a warranty of
12 months (unless stated otherwise) for parts,
labour and return to site. The warranty period
runs from the date of purchase by the end user.
These products are warranted to be free
from defects in materials and workmanship
at the time of delivery. Scott Safety will
be under no liability for any defect arising
from wilful damage, negligence, abnormal
working conditions, failure to follow the
original manufacturer’s instructions, misuse or
unauthorised alteration or repair.
Evidence of purchase date will need to be
provided for any claims arising during the
warranty period. All warranty claims must be
directed through Customer Services and in
accordance with our sales return procedure.
TECHNICAL
DESCRIPTION
GENERAL
RAS is a positive pressure airline apparatus with
a bandolier and waistbelt harness. The supply
airline hose connects to a CEN connector that
supplies the facemask mounted demand valve
via a length of medium pressure air hose. The
facemask with filter and can be fitted with a
suitable Scott Safety Particulate filter when
entering, or leaving the hazard area with the
airline disconnected. In this mode the facemask
functions as a negative pressure device.
WARNING: RAS must not be used in oxygen
deficient or hazardous atmospheres when
disconnected from the Airline supply.
A NRV in the airline connector prevents
contaminant entering the breathing hose while
the wearer is disconnected from the airline.
FILTERS
The service life of the filters is dependent on
the environment and the use-by-date marked
on the filter. DO NOT use damaged, wet,
clogged, or time expired filters.
The filter screws into the facemask’s screw
connector. A filter cover is provided to
preserve the filter when an airline is in use. A
blank-plug is provided to seal the mask when
a filter is not fitted. Filters must conform
to EN14387:2004+A1:2008 or EN143 with
an EN148-1 standard thread and must be
appropriate for the known work place hazards.
RAS apparatus may be used with up to 90
metres (297 feet) of medium pressure airline
hose, with a burst pressure in excess of 80 bar.
When likely to come into contact with corrosive
fluids or materials, it is recommended that only
anti-static hoses are used.
DEMAND VALVE HOSE
The hose has a working pressure of 16 bar and
a burst pressure in excess of 80 bar.
The airline manifold assemblies have an integral
particle filter to remove contaminant from the
air supply.
The RAS airline manifold assemblies incorporate
a NRV.
DEMAND VALVE (DV)
The DV operates in conjunction with the exhale
valve in the facemask to maintain a positive
pressure within the facemask.
The DV has a reset button that enables wearers
to close the airflow through the DV, allowing
the facemask to be removed without loss of
cylinder air.
When the apparatus is donned the DV is
normally ‘reset’ (closed), and is opened
(activated) when the wearer takes a first breath.
PANASEAL / VISION 3 /
PROMASK FACEMASK
The Panaseal, Vision 3 and Promask facemasks
are available, manufactured in non-dermatitic
Neoprene or Silicone and have a 5-point
head harness. A neckstrap is provided. The
polycarbonate visor is impact resistant.
An inner mask minimises CO2 dead space and
visor misting. A speech diaphragm is fitted.

4RAS
BANDOLIER AND WAISTBELT
HARNESS
The bandolier and waistbelt harness is easy
clean webbing or standard fabric with nylon
buckles. Airline pull is taken by the harness, via
a D-ring sewn into the bandolier. The airline
connector manifold is attached to the D-ring
by a shackle.
PRE-USE AND MONTHLY
CHECKS
WARNING: Do not use apparatus that fails
any of the following inspections or checks.
INSPECTION
Check that:
The apparatus is complete, clean and in good
condition.
All buckles are in good condition and close
and open freely.
Waistbelt and shoulder straps are fully
slackened and ready for use.
Check that the orange O-ring on the DV
outlet is clean and in good condition.
The facemask, especially the visor, is in good
condition with the harness fully slackened.
When airline hoses are used, check that:
Hoses are in good condition: free of splits,
abrasions and crush damage.
Couplings are in good condition and can be
made and broken easily.
The air supply conforms to EN 12021:1999
(See Introduction).
Check that the filter is suitable for the
workplace hazard and within its use-by date
(see filter label). If a filter is not fitted the
blanking plug must be fitted.
Check that the O-ring on the filter or blanking
plug is in good condition.
Buckles on both apparatus are black nylon and
stainless steel.
In addition to the QF bayonet connector; there
is a right screw connector for attaching the
replaceable air filter.
A blanking plug is provided which must be
fitted if the facemask is used without a filter.

RAS5
BANDOLIER WAISTBELT
WARNING: Do not use the apparatus if the
shackle is missing or damaged.
Check there is no damage or excess wear in
the bandolier and that the shackle is securely
attached to the D-ring. If necessary tighten the
shackle nut.
Ensure that the CEN airline connector is clean
and in good condition.
Equipment that is damaged or shows signs of
excessive wear should be returned to a Scott
Safety service centre.
DO NOT use the equipment if it fails any of the
above checks.
Check the airline supply pressure.
DV & FACEMASKS
Press the black rubber reset button on the side
of the DV.
Check that the red bypass switch is turned so
that the flat on the bypass switch aligns with
the DV outlet.
Check that the facemask is clean and
undamaged.
Check that the orange DV O-ring is clean and
in good condition.
Fit the DV to the facemask and turn it in the
facemask fitting until the red locking catch
engages fully. Twist the DV gently to confirm
that it has engaged.
AIRLINE CHECKS
Check the supply airline flow and pressure.
Remove connector dust caps and check for
wear and damage.
Make connection to an appropriate connector
capable of supplying breathable compressed
air (See Introduction, Compressed Airline
Supplies).
Check that the connection is secure and that
the connector releases easily, without sticking.
Press the DV reset button.
Pressurise the attachment and check all
connections for leaks. On airline attachments
check that the female connector does not leak.
DO NOT use attachments that show signs
of excessive wear, or damage or that leak
excessively.
Replace dust caps.

6RAS
DONNING POCEDURES
ATTACHING THE FILTER
WARNING: When breathing from an airline,
a filter cover, or blanking plug must be in
place to ensure that the first breath will
activate.
Check that the cord from the filter cover is
around the filter connector. Check that the
filter is in-date (see filter label).
Check that the filter O-ring is in place and
in good condition. Screw the filter to the
facemask.
If a filter is not used a blank plug must be fitted
in its place.
DONNING THE BANDOLIER
Hang the facemask from the neckstrap and
don the bandolier so that the DV hose is over
the right shoulder.
Fasten the waistbelt and adjust the shoulder
strap for a comfortable fit.
FACEMASKS
Hold the head harness lower straps, place chin
in chin-cup and pull straps over back of head,
brushing hair away from faceseal.

RAS7
Tighten the straps in sequence: bottom, side
then top. DO NOT over-tighten as this distorts
the faceseal.
NEGATIVE PRESSURE TEST
Disconnect the airline supply.
Attach the filter seal cord to the neckstrap and
fit the filter seal to the mask.
Use a thumb to seal the airline coupling.
Press the filter seal with the palm of the hand to
seal the filter inlet, and inhale. Hold your breath
for 10 seconds. Check that the facemask pulls
on to the face and does not pull away during
the 10 seconds.
Re-connect the airline supply.
POSITIVE PRESSURE TEST
Check that the bypass switch is in the closed
position and inhale sharply to activate the first
breath mechanism.
Insert a finger under the mask seal and check
for a steady outward flow of air.
Remove the finger and allow the mask to re-
seal.

8RAS
FACE SEAL TEST
Hold your breath for 10 seconds and listen
carefully for leaks.
If the facemask fails the leak test: open the
cylinder valve loosen the headharness adjust
the facemask and repeat steps 1 to 3 until a full
seal is achieved.
DO NOT use apparatus that leaks.
DEMAND VALVE TEST
Open the bypass switch and check that there is
a steady flow of air into the facemask.
Close the bypass switch.
AIRLINE SUPPLY
Connect the airline to the apparatus and close
the cylinder valve.
If necessary, take a sharp breath to activate the
DV, and then breathe normally.
WHILE IN USE
In the unlikely event that the DV fails to
supply air - open the bypass switch and go
immediately to a safe breathable atmosphere.
In the unlikely event that the DV fails to
supply air, even when the bypass is open - go
immediately to a safe breathable atmosphere.
DO NOT remove the facemask while in a
hazardous atmosphere.
Ensure that the airline does not become
trapped, snagged, kinked or crushed.
Ensure that the airline air supply is sufficient
for the duration of the tasks to be undertaken.
When air is supplied by a compressor, ensure
that the air at the air intake is clean and free of
contaminant and exhaust fumes.
When air is supplied from an airline trolley,
ensure that the trolley is monitored by a
competent person.
Ensure filter cover is in place when breathing
from the airline supply.
Leave the hazardous area if you taste, or smell
contaminant.

RAS9
DOFFING
WARNING: Do not remove the apparatus
until well clear of the hazard area.
Hold your breath and press the DV reset button.
Release the head harness by pulling the buckles
forward, and remove the facemask.
Push the airline couplings together and pull
back the CEN collar to disconnect the airline
hose.
Open the DV bypass to vent any compressed
air from the facemask and close the bypass.
Replace the dustcap on the coupling.
Release the waistbelt, and remove the
apparatus.
Clean and check the apparatus in accordance
with Section - After Use Cleaning and Testing
before returning it to service.

10RAS
AFTER USE
CLEANING
Cautions:
DO NOT immerse the DV in water.
USE ONLY the specified methods and
materials. DO NOT use bleach, solvent,
detergent or abrasive cleaners.
Dry thoroughly, away from direct heat and
sunlight, prior to storage.
Disconnect DV from the facemask.
Wash and disinfect the mask thoroughly in a
solution of disinfectant and hand-hot warm
water.
Rinse the mask thoroughly in clean running
water. Pay particular attention to flushing out
the exhale valve.
Hang mask by its neckstrap and allow it to dry
thoroughly away from direct heat or sunlight.
When dry, sanitise the faceseal with Distel
disinfectant wipes.
Note: Distel disinfecting wipes are available in
packs of 20 sachets, (Article No. 2004225) or
drums of 100 wipes (Article No. 1017652).
Polish the visor inside and out with a clean, lint-
free cloth and slacken the head harness, ready
for use.
Sponge the harness with a mild soap and warm
water solution. Rinse thoroughly and dry in a
well-ventilated room away from direct heat and
sunlight.
Cautions:
DO NOT immerse the DV.
DO NOT store until completely dry.
Fit the yellow cap on the DV outlet.
If required use a small brush (tooth brush) and
a mild solution of soap and warm water to clean
around the locking catch and bypass switch.
Clean the valve body using a lint free cloth
moistened in a mild solution of soap and warm
water.
CHECK APPARATUS
Operate the DV locking catch and bypass
switch several times and check that they do
not stick. If either is not free moving, attach
explanatory note and return for service.
Check that the harness is not worn or
damaged, and that buckles and fastenings
are fully operational. Apparatus with major
defects must be returned for service, with an
explanatory label attached.
Check apparatus in accordance with Section -
Pre-Use and Monthly Checks.
STORAGE
Device must be protected from damage during
transportation.
The apparatus must be stored in a clean
dry environment away from direct heat and
sunlight.
Storage temperature should not exceed +40oC
to -10oC.
SCHEDULED
MAINTENANCE
MONTHLY
Test RAS in accordance with the instructions
given in Section - Pre-use and Monthly
Checks of this Manual. Record test details
in the apparatus’ BA Logbook. This record is
mandatory in the UK and most EC countries;
and must be kept up to date and available
for inspection. Please see Section - Check
Aparatus for details.
ANNUALLY
RAS must be returned for a workshop service
annually and for a major workshop service at
six-yearly intervals.
After each workshop service, perform the
user checks detailed in Section - Pre-use
and Monthly Checks of this Manual prior to
returning RAS to service.
Check that workshop service details have been
recorded in the apparatus’ BA Log.

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[email protected]
Tel: [phone]
Fax: [phone]
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Pimbo Road, West Pimbo,
Skelmersdale, Lancashire,
WN8 9RA, England © 2011 Scott Safety. All rights
reserved. SCOTT, the SCOTT
SAFETY Logo, Scott Health
and Safety, RAS are registered
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affiliates.English (GB)