6
Sigma 2 Type 2
POSITIVE PRESSURE, BYPASS AND
LEAK TEST
WHISTLE TEST
REPLACING CYLINDERS
Insert fingers in the facemask seal and check
there is a steady flow of air out of the mask.
Remove fingers and allow mask to re-seal.
Open the bypass and check there is a steady
flow of air into the facemask.
Close the bypass.
Close the cylinder valve, hold your breath, and
monitor the pressure gauge for 10 seconds.
Check that the reading does not drop during
this period.
With the cylinder valve still closed, monitor the
pressure gauge and breathe down air in the
system. Check that the whistle sounds clearly
at between 50 and 60 bar.
Release head-harness and remove the
facemask.
Apparatus that passes all of these checks is
now ready for use.
Check that the cylinder valve is closed and
slowly undo the cylinder connector hand-
wheel. Remove the reducer from the cylinder.
Grasp the sides of the cam-lock buckle with the
index finger and thumb of the right hand, use
the left index finger to slide back the ribbed
catch and lift the buckle.
Open the buckle and lift the empty cylinder
from the back-plate.
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