CONTOUR
15
2. Tighten harness side straps. DO
NOT over-tighten.
3. Inhale deeply to activate the DV
then breathe normally.
4.4 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.
4.5 FACEMASK SEAL TEST
1. Close the cylinder valve and keep
hold of the hand-wheel. Hold breath for
10 seconds and listen carefully for leaks.
A leak will cause the pressure gauge
reading to fall.
2. If the facemask fails the leak test:
open the cylinder valve, loosen the head-
harness, adjust the facemask and repeat
the test.
4.6 WHISTLE TEST
1. With cylinder valve still closed,
slowly breathe down the air from the
system. Check that the whistle sounds
clearly as the pressure gauge falls to 55
bar (±5 bar).
2. Once the whistle has sounded,
open the cylinder valve fully.
3. DO NOT USE apparatus that fails
this test. Attach an explanatory note and
return for service.
4.7 FINAL CHECKS
1. Check that the cylinder valve(s)
is/are fully open and that the pressure
gauge shows that there is sufficient air.
WARNING:
On Duo models, BOTH cylinder valves
MUST be fully open immediately prior
to and during use.
2. Turn on the DV bypass knob and
check for a steady flow of air into the
mask. Close the bypass knob.
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