Negative Pressure Leak Test - MSA G1 SCBA Operating Manual

WARNING!
Ensure that the top of the facepiece seal
no hair between the facepiece's seal and the user's skin.
Failure to follow these warnings can result in serious personal injury or death.

Negative Pressure Leak Test

In order to check the facepiece-to-face tightness a negative pressure leak test must be performed
before each use.
(4) Adjust facepiece and tighten the straps firmly and evenly.
directly contacts the user's forehead. Ensure that there is
(1) Seal the inlet connector with the palm of your hand or by
attaching the regulator.
If properly aligned the bypass knob will show on the right
side of the user's facepiece.
(2) Test tightness.
a)Inhale and hold breath for 10 seconds.
The facepiece must stay collapsed on face.
b)Exhale.
The exhalation valve should open and release the pressure
inside the facepiece.
(3) If necessary retighten the straps.
If the leak test fails the facepiece must not be used.
G1 SCBA
Donning
US
37