SCOTT Sigma 2 User Manual

SIGMA 2
9
2. Fit the chin into the chin-cup, pull the
harness over the top of the head and
tighten the straps in sequence: bottom,
middle, top. DO NOT over-tighten.
4.2.2 Head-net
1. With the head-net straps fully
extended, insert the chin into the chin-cup
and use the loop at the back of the head-
net to pull the head-net over the head.
2. Tighten the top strap to bring the
visor and ori-nasal mask to the correct
level.
3. Tighten the side straps for a firm,
comfortable fit. DO NOT over-tighten as this
distorts the face seal.
4.3 OPEN CYLINDER VALVE
1. Slowly open cylinder valve fully:
• On Instant Air DVs, check that
the DV free-flows into facemask
until the head-harness straps are
tightened.
• On First Breath DVs, inhale
sharply to start the air supply to
the facemask.

SCOTT Sigma 2 Specifications

General

Type	Self Contained Breathing Apparatus (SCBA)
Application	Firefighting, Industrial
Cylinder Duration	Varies based on cylinder size and breathing rate
Approval	EN 137
Compatibility	Compatible with various cylinders
Features	Ergonomic design