Sigma 2 Type 25
GENERAL
Check that all parts are clean and undamaged.
Ensure that the shoulder harness is fully
slackened and that a fully charged cylinder is
securely attached to the back-plate. Replace
discharged cylinders.
Check that the harness slides freely through
buckles.
Check that the facemask visor is clear and free
from marks and damage that might impair
vision. Fully slacken head-harness straps.
Apparatus that fails any of these checks must
be serviced in accordance with the SIGMA 2
TYPE 2 Service Manual.
PRE-USE AND MONTHLY CHECKS
PNEUMATICS
DEMAND VALVE
Check that the DV O-ring is clean and
undamaged.
Fit the DV to the facemask and check that the
locking catch clicks into place. Gently twist the
DV to ensure that it is securely fitted.
CHECK FACEMASK
Don the facemask.
Open the cylinder valve and check that the
cylinder is full.
Check that the facemask pressurises. If
necessary adjust the mask to obtain a leak
tight fit. DO NOT over-tighten the harness as
this distorts the mask.
Check cylinder connector O-ring is clean and
undamaged.
Screw hand-wheel connector firmly into the
cylinder valve outlet.
Check that pressure gauge, whistle and hoses
are in good condition and are not kinked or
stretched.
Check that the bypass valve is closed (flat area
on knob is toward the face-piece).
Press the black reset button.
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