Scott Sigma 2 User Manual
SIGMA 2
Self-contained Breathing Apparatus
User Instructions
Article No. 1035017 Issue G 05. 2010
Self-contained Breathing Apparatus
Contents
WARNINGS ............................................................................................................................................................................... ii
1. INTRODUCTION ........................................................................................................................................................ 1
1.1 IMPORTANT .............................................................................................................................................. 1
1.2 BREATHABLE AIR .................................................................................................................................... 1
1.3 APPARATUS DURATION .......................................................................................................................... 1
1.4 PERSONNEL TRAINING ........................................................................................................................... 1
1.5 SERVICING ............................................................................................................................................... 2
1.6 SPARE PARTS AND ACCESSORIES ....................................................................................................... 2
1.7 NOTIFIED BODIES .................................................................................................................................... 2
2. TECHNICAL DESCRIPTION ..................................................................................................................................... 2
2.1 GENERAL .................................................................................................................................................. 2
2.2 APPARATUS DESCRIPTION .................................................................................................................... 2
2.3 PNEUMATIC SYSTEM .............................................................................................................................. 4
2.4 REDUCER ................................................................................................................................................. 4
2.5 DEMAND VALVE ....................................................................................................................................... 4
2.6 FACEMASKS ............................................................................................................................................. 5
3. PRE-USE AND MONTHLY CHECKS ........................................................................................................................ 6
3.1 GENERAL .................................................................................................................................................. 6
3.2 PNEUMATICS ............................................................................................................................................ 6
3.3 DEMAND VALVE ....................................................................................................................................... 6
3.4 CHECK FACEMASK .................................................................................................................................. 6
3.5 POSITIVE PRESSURE, BYPASS AND LEAK TEST ................................................................................. 7
3.6 WHISTLE TEST ......................................................................................................................................... 7
3.7 REPLACING CYLINDERS ......................................................................................................................... 7
3.7.1 Fitting a replacement Cylinder of the same size. ....................................................................... 8
4. DONNING PROCEDURE .......................................................................................................................................... 8
5. DOFFING INSTRUCTIONS ..................................................................................................................................... 11
6. AFTER USE ............................................................................................................................................................. 12
7. SCHEDULED MAINTENANCE ................................................................................................................................ 14
3.7.2 Fitting a replacement Cylinder of a different size. ...................................................................... 8
4.1 HARNESS .................................................................................................................................................. 8
4.2 DON FACEMASK ...................................................................................................................................... 8
4.2.1 Head Harness ............................................................................................................................ 8
4.2.2 Head-net .................................................................................................................................... 9
4.3 OPEN CYLINDER VALVE ......................................................................................................................... 9
4.4 FACEMASK SEAL CHECK ...................................................................................................................... 10
4.5 BYPASS CHECK ..................................................................................................................................... 10
4.6 LEAK TEST .............................................................................................................................................. 10
4.7 WHISTLE TEST ....................................................................................................................................... 10
4.8 CYLINDER PRESSURE .......................................................................................................................... 11
5.1 REMOVE FACEMASK ............................................................................................................................. 11
5.2 TURN OFF CYLINDER ............................................................................................................................ 12
5.3 REMOVE APPARATUS ........................................................................................................................... 12
5.4 CLEAN AND CHECK APPARATUS ........................................................................................................ 12
6.1 CLEAN FACEMASK ................................................................................................................................ 12
6.2 CLEAN APPARATUS .............................................................................................................................. 13
6.3 DEMAND VALVE ..................................................................................................................................... 13
6.4 CHECK APPARATUS .............................................................................................................................. 13
6.5 FIT FULLY CHARGED CYLINDER .......................................................................................................... 13
6.6 LEAK TEST .............................................................................................................................................. 13
6.7 RECORD TEST DETAILS ....................................................................................................................... 14
6.8 STORAGE ................................................................................................................................................ 14
7.1 MONTHLY ................................................................................................................................................ 14
7.2 ANNUALLY .............................................................................................................................................. 14
Registered Office: Scott Health and Safety Limited, Pimbo Road, West Pimbo,
Skelmersdale, Lancashire, WN8 9RA, England.
i
WARNINGS
Please Read Carefully and Fully Understand
This manual is for use by personnel 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 SIGMA 2 User Instructions may result in injury or death.
Scott Health and Safety Limited 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 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 selfcontained, 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.
In order to ensure the optimum performance and user safety, the apparatus
must be tested and serviced in accordance with Section 7 and the notes in
Section 1 under 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 1 for details.
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.
The harness must not be used as a vehicle seat restraint.
DISCLAIMER
Failure to follow 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 in whole, or used for purposes other than its
intended purpose without the written permission of Scott Health and Safety Limited.
ii
SIGMA 2
1. INTRODUCTION
1.1 IMPORTANT
SIGMA 2 must be serviced in accordance
with the Servicing Schedule on at least an
annual basis. Please refer to notes under
Servicing.
These instructions for the use, care and
maintenance of the apparatus must be
followed to ensure the correct and safe
operation of SIGMA 2.
For any enquiries regarding the use of
SCOTT breathing apparatus, please
contact Training and Technical Support
Services at Scott Health and Safety
Limited.
1.2 BREATHABLE AIR
Air used to supply or charge breathing
apparatus may be natural or synthetic. The
composition of breathable air is given in
Table 1.
COMPONENT
OXYGEN 23.14 20.948
NITROGEN 75.52 78.08
ARGON 1.29 0.93
CARBON
DIOXIDE
HYDROGEN 0.000 003 0.000 05
NEON 0.001 270 0.001 818
HELIUM 0.000 037 0.000 524
KRYPTON 0.000 330 0.000 114
XENON 0.000 039 0.000 009
MASS %
(Dry Air)
0.05 0.031 4
Table 1: Breathable Air
There is an increased fire risk when the
oxygen content is above the value shown.
The purity/quality of air used to supply and
charge breathing apparatus should be
tested periodically in accordance with
national regulations. If not specified
otherwise, contaminants shall not exceed
the permissible exposure level.
National regulations must be observed.
VOLUME%
(Dry Air)
The mineral oil content shall be such that
the air is without the odour of oil. The odour
threshold is in the region of 0.3 mg/m
The water content shall not exceed 50
3
for 207 bar apparatus and 30 mg/m3
mg/m
3
.
for 300 bar apparatus.
1.3 APPARATUS DURATION
All durations quoted are nominal, based on
an Average Wearer Consumption Rate of
40 litres/minute and FULLY CHARGED
cylinders. Actual Wearer Consumption rates
vary due to many factors, such as:
1. Workload: high work rates increase
consumption rates.
2. Weight of apparatus and use of
heavy or restrictive clothing.
3. Work environments with extremes of
heat or cold.
4. Physical fitness of the wearer.
5. Other factors include emotional
stress and fatigue.
It is important that all wearers are aware of
these factors and take account of them
when assessing cylinder duration.
1.4 PERSONNEL TRAINING
Personnel who use self-contained,
compressed air breathing apparatus must
be fully trained in accordance with these
instructions and national regulations.
These instructions cannot replace an
accredited training course run by fully
qualified instructors in the proper and safe
use of SCOTT breathing apparatus.
Please contact Training and Technical
Support Services or your distributor for
training course details.
Training and Technical Support
Services:
Scott Health and Safety Limited
Pimbo Road,
West Pimbo,
Skelmersdale,
Lancashire,
WN8 9RA,
England.
Tel: +44 (0) 1695 711711
Fax: +44 (0) 1695 711775
1
SIGMA 2
1.5 SERVICING
SIGMA 2 must be serviced at scheduled
intervals by personnel who have completed
a formal training course and hold a current
certificate for servicing and repairing
SCOTT breathing apparatus. Details of the
servicing schedule are contained in the
SCOTT SIGMA 2 Service Manual, copies of
which can only be obtained by registered
holders of a current certificate.
Your distributor or Training and Technical
Support Services can provide training
course details and quotes for service
contracts. Please see above for contact
details.
1.6 SPARE PARTS AND
ACCESSORIES
Our Customer Services Department
provide an efficient, friendly, customer
contact point for ordering new apparatus,
spare parts and accessories. The team can
also provide general information on SCOTT
products.
Customer Services:
Scott Health and Safety Limited
Pimbo Road,
West Pimbo,
Skelmersdale,
Lancashire,
WN8 9RA,
England.
Tel: +44 (0) 1695 711711
Fax: +44 (0) 1695 711775
1.7 NOTIFIED BODIES
Inspec International Limited (0194)
56 Leslie Hough Way,
Salford,
Greater Manchester,
M6 6AJ,
England.
BSI Product Services (0086)
Kitemark House,
Maylands Avenue,
Hemel Hempstead,
HP2 4SQ,
England.
2. TECHNICAL
DESCRIPTION
2.1 GENERAL
SIGMA 2 is a self-contained, open circuit,
compressed air, positive pressure,
breathing apparatus, approved to EN 137
(self-contained open circuit breathing
apparatus). It is 'CE' marked in accordance
with Council Directive 89/686/EEC.
SIGMA 2 is approved for use at sea by:
Lloyds Inspectorate, in accordance with
SOLAS regulation 17 and the 1980
Merchant Shipping Act.
Please call Scott Health and Safety
Limited for further apparatus approval
details.
2.2 APPARATUS
DESCRIPTION
SIGMA 2 has a lightweight back-plate and
harness. The two stage pneumatic system
consists of a first stage reducing valve; and
a Demand Valve (DV) that is attached by a
bayonet fitting, to the positive pressure full
facemask.
The back-plate is injection moulded
polyamide/glass/carbon composite, with a
fully adjustable flame retardant polyester
webbing harness. The Kevlar
band is fully adjustable and can
accommodate one cylinder from the range
listed in Table 2. A glass-filled polyamide
cam-lock buckle facilitates quick and easy
cylinder replacement. A lumbar pad,
fabricated from flame retardant polyester
and packed with flame retardant closed cell
foam, cushions the weight of the apparatus.
It is attached to the lower back-plate by
means of press-studs. Pneumatic hoses
run in channels moulded into the inner
back-plate. Hose retaining clips are
moulded on the edge of the channels. A
cylinder valve retainer on the lower backplate provides a secure mounting for the
cylinder valve.
TM
cylinder
2
SIGMA 2
Cylinder Types Water
Volume
(litres)
CYL-1200 6.0 207 1200 22 8 30 8.8
CYL-HWG-1200 6.0 207 1200 22 8 30 7.2
CYL-FWC-1300 4.7 300 1300 25 7 32 5.0
CYL-1640 6.0 300 1640 33 8 41 12.5
CYL-HWG-1640 6.0 300 1640 33 8 41 10.0
CYL-FWC-1640 6.0 300 1640 33 8 41 6.3
CYL-1800 9.0 207 1800 33 12 45 13.0
CYL-HWG-1800 9.0 207 1800 33 12 45 11.2
CYL-FWC-1800 9.0 207 1800 33 12 45 6.75
CYL-FWC-1860 6.8 300 1860 37 9 46 6.75
CYL-2240 11.0 207 2240 41 15 56 14.4
CYL-FWC-2460 9.0 300 2460 50 12 62 8.8
Table 2: Cylinders approved for use with SIGMA 2
Cylinder Material is identified by codes within the Cylinder Type. Table 3 identifies the
meaning of the cylinder material code and the specification to which the cylinder is
manufactured:
Code Material Specification
No Code Steel (e.g.: CYL-1200) BS5045 Pt.1
HWG Hoop Wrapped Glass Fibre (e.g.: CYL-HWG-1200) HSE-AL-HW1
FWC Fully Wrapped Carbon (e.g.: CYL-FWC-1300) HSE-AL-FW2
Charging
Pressure
Free Air
Volume
(litres)
Nominal
Duration
(minutes)
Warning
Period
(minutes)
Table 3: Cylinder Codes and Specifications
Total
Duration
(minutes)
Cylinder
Charged
Weight
(Kg)
Durations are nominal and based on an Average Wearer Consumption Rate of 40 L/min and
are for fully charged cylinders.
Total Duration =
Nominal Duration =
Warning Period =
Cylinder Water Capacity x Whistle Operating Pressure
Cylinder Free Air Capacity
Average Wearer Consumption Rate
Total Duration minus the Warning Period.
Average Wearer Consumption Rate
3
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