Facemasks With A Net Harness; Positive-Pressure Test; Facemask Seal Test; Whistle Test - Scott Safety PROPAK Series Manual

Facemasks with a Net Harness

Place the neck-strap around the neck.
Hold the mask by the side of the net harness,
place the chin into the chin-cup and pull the
mask onto the face. Grasp the pull-strap at the
rear of the net harness and pull the net over
the head.
Tighten harness side straps. DO NOT OVER-
TIGHTEN.
Inhale deeply to activate the DV. Breathe
normally.

POSITIVE-PRESSURE TEST

With the cylinder valve open, insert a finger
under face-seal and check for a steady outward
flow of air. Remove finger and allow mask to
re-seal.

FACEMASK SEAL TEST

Close the cylinder valve and continue to hold
the hand-wheel. Hold breath for 10 seconds
and listen carefully for leaks. A leak will cause
the pressure gauge reading to fall.
If the facemask fails the leak test: open the
cylinder valve, loosen the head-harness adjust
the facemask and repeat the test.

WHISTLE TEST

With the cylinder valve still closed, slowly
breathe down the air from the system. Check
that the whistle (13) sounds clearly as the
pressure gauge falls to 55 bar (+5 bar).
Once the whistle has sounded, open the
cylinder valve fully.
WARNING: DO NOT use apparatus that fails
this test. Attach an explanatory note and
return for servicing.

FINAL CHECKS

Check that the cylinder valve is fully open and
that the pressure gauge (14) shows that there
is sufficient air.
Turn on the DV bypass knob (26) and check for
a steady flow of air into the mask. Close the DV
bypass knob.

AIRLINE ATTACHMENTS

Check the supply airline flow and pressure.
Remove connector dust caps and check for
wear and damage.
Make connection to an appropriate connector
capable of supplying breathable compressed
air (see Section - Compressed-Air Airline
Supplies).
WARNING: Airlines should be at least 15
metres long.
Use anti-static hoses in flammable or explosive
atmospheres.
Close cylinder valve while breathing from the
airline.
Check that the connection is secure and that
the connector releases easily, without sticking.
Press the DV reset button (25).
Pressurise the attachment and check all
connections for leaks. Ensure that the female
connector on the airline attachment does not
leak.
WARNING: DO NOT use attachments that
show signs of excessive wear or damage, or
that leak excessively.
Replace dust caps.
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