SIGMA 2
7
3.5 POSITIVE PRESSURE,
BYPASS AND LEAK TEST
1. Insert fingers in the facemask seal
and check there is a steady flow of air out of
the mask.
2. Remove fingers and allow mask to re-
seal.
3. Open the bypass and check there is a
steady flow of air into the facemask.
4. Close the bypass.
5. 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.
3.6 WHISTLE TEST
1. 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.
2. Release head-harness and remove
the facemask.
3. Apparatus that passes all of these
checks is now ready for use.
3.7 REPLACING CYLINDERS
1. Check that the cylinder valve is
closed and slowly undo the cylinder
connector hand-wheel. Remove the reducer
from the cylinder.
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