SIGMA 2
5
The first breath version can be shut by
pressing a reset button on the DV and
opens when the wearer takes the first
breath. This permits the DV to be removed
from the face-piece while the cylinder valve
is open, without loss of cylinder air.
The bypass provides a constant flow of air
in the unlikely event that the regulator
malfunctions in a ‘no flow’ mode.
The bypass is opened by turning the knob
through 90°. As use of the bypass
consumes cylinder air rapidly, it must only
be used to escape from the hazardous
area.
2.6 FACEMASKS
SIGMA 2 is approved for use with: Vision
3, PanaSeal and PanaVisor full
facemasks, all of which conform to EN 136.
All are available with 5-point, fully
adjustable web or net head harnesses and
neck-straps. An inner mask minimises CO
2
dead space and visor misting. A speech
diaphragm is fitted.
Vision 3 Facemask with Head-harness
PanaSeal is suitable for medium and
smaller face sizes. PanaVisor is suitable
for medium to larger face sizes. Vision 3 is
available in three sizes: small, medium and
medium/large.
PanaSeal/PanaVisor Facemask with
Head-net
Vision 3 is moulded in grey silicone, while
PanaSeal and PanaVisor are non-
dermatitic black neoprene, or blue silicone.
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