20
Functional Tests
G1 Industrial SCBA
US
5
Functional Tests
WARNING!
If the SCBA does not function properly for all tests as described in the Functional Tests section, the
SCBA must be removed from service and the condition must be checked and corrected by an MSA
trained and certified repair person before using. Failure to follow this warning can result in serious
personal injury or death.
If the SCBA has passed the visual inspection successfully, conduct the functional tests daily and after
each use.
If any part of the SCBA fails the functional test, do not use the SCBA and return the device to a certified
repair technician.
NOTE
: The functional checks must be conducted with a full cylinder. Before starting the tests, check
the pressure gauge on the cylinder valve to verify that the cylinder is full.
5.1
Check that the Regulator and Facepiece Can Hold a Negative Pressure
(1) Close the cylinder valve and vent any air from the system using the bypass knob or the purge
cover on the regulator. After venting, ensure that the bypass knob is fully closed (clockwise).
(2) Hold the facepiece against the face to create an effective seal.
(3) Attach regulator to the facepiece and inhale until the facepiece begins to collapse against the
face.
(4) Hold breath for approximately 10 seconds.
a) Negative pressure should be maintained and the facepiece should remain collapsed against
the face for the entire 10 seconds.
Do not use the SCBA if negative pressure cannot be maintained in the facepiece.
