SCOTT : Respiratory Protection - Breathing Apparatus Sigma 2 - Industrial

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Sigma 2 Breathing Apparatus

Art : ZD-SCT1100

Sigma 2 Breathing Apparatus



Self Contained Breathing Apparatus


The Scott Sigma-2 is an open circuit, self-contained, compressed air breathing apparatus. It consists of a back plate, carrying harness and pneumatic system, consisting of a reducer with integrated cylinder connector, pressure gauge, whistle and demand valve.
The Sigma can be configured in a number of different ways with various sized single cylinders and the choice of Vision 3, Panaseal, Panavisor or Promask PP facemask.



The Sigma-2 is specifically designed as a Marine/Industrial Fire Fighting SCBA, but is also suitable for providing respiratory protection for any IDLH environment.

Approval Information

• CE marked in accordance with EN137:1998




Pressure Reducing Valve
Rust Tube (Sabre Cyls)
Reducing Valve Seat
HP Pressure Gauge
HP Pressure Gauge Cover
MP Air Supply Hose Fittings

Facemask Visor
MP Air Supply Hose
HP Air Hose
Valve Handwheel (Sabre Cyls)
Cylinder Band
Strap Buckles
Cylinder Valve
Demand Valve Casing

Nickel Plated Brass
Polyamide (Nylon)
Nitrile, Silicone, EPDM
Stainless Steel
Stainless Steel, Polycarbonate Lens
Nickel Plated Brass

Neoprene, Silicone or Procomp
Chlorinated Polyethylene, fabric braid reinforcement, Nitrile liner
PTCFE liner, stainless steel braiding, Estane sleeve
Glass filled Polyamide
Flame retardant polyester
Glass & Carbon filled Nylon composite
Flame retardant polyamide and closed cell Polyethylene foam
100% Kevlar
Flamer retardant polyamide
Steel or Composite
Nickel Plated Brass
Glass filled Polyacetal and Polyamide



N.B. - Cleaning should only be carried out as specified in the user instructions.
Maintenance and Servicing must only be performed by trained personnel following the procedures in the Service and Maintenance manual.


Technical Specifications

Tempest Demand Valve

Compact positive pressure demand valve featuring servo-assisted, tilting diaphragm mechanism with low inspiratory resistance and responsive dynamic performance, automatic first breath actuation and hands free bypass facility. Components injection moulded from Polyamide and Acetyl with rubber seals and diaphragms.


First breath activation        -20 to -30 mbar
Peak flow performance      In excess of 500 litres/minute
Bypass flow                      150 litres/minute nominal
Static positive pressure      1.0 – 4.0 mbar


Reducing Valve

First stage pressure reducing valve featuring non-adjustable, spring loaded piston mechanism and outlet supply protected by pressure relief valve. Valve body and cap machined from nickel-plated brass with stainless steel spring and hose retainer U-clips.


Outlet pressure

200 bar inlet                                      5.5 to 9.5 bar
300 bar inlet                                      6.0 to 11.0 bar
Pressure relief valve protected              Approx. 13.5 bar
Flow restrictor to gauge supply hose     <25 litres minute


Pressure Indicator & Warning Whistle

Bourdon tube type dial indicator
Heat and Impact resistant Polycarbonate lens
Safety blow-out vent in rear of gauge - accuracy:- +/- 10 bar between 40-300 bar


Stainless steel swivel hose fittings


Medium pressure hose

Maximum working pressure   16 bar
Minimum burst pressure        80 bar

High pressure hose

Maximum working pressure   450 bar
Minimum burst pressure        800 bar


Packing Specifications

Single 69x41x28cm 5kg


Single configuration (less cylinder)                     2.3kg
Single configuration & facemask (less cylinder)    3.0kg
Length                                                         600mm
Width                                                           278mm
Depth (with 6.0 litre 200 bar cylinder)               200mm

Size: Details
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