Functional Tests; Check That The Regulator And Facepiece Can Hold A Negative Pressure; Check Function Of Regulator - MSA G1 SCBA Operating Manual

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 purge any air from the system using the bypass knob or the purge
cover on the regulator
(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.
5.2

Check Function of Regulator

(1) Push the release buttons on the side of the regulator to ensure the regulator is shut off.
(2) If the regulator is equipped with a bypass valve, ensure that the bypass knob is fully closed
(clockwise).
(3) Open the cylinder valve and ensure the valve is completely open.
(4) Observe the LED display.
a)The LEDs must illuminate in a sequenced pattern.
After the sequence is completed, the corresponding system pressure will be displayed.
(5) Open the bypass knob (counterclockwise).
a)Ensure that air flows from the regulator.
(6) Close the bypass knob (clockwise).
(7) Attach the regulator to the facepiece.
(8) Ensure proper attachment by pulling on the regulator.
(9) Don the facepiece or hold the facepiece against the face to create an effective seal.
(10) Inhale sharply to start air flow.
G1 SCBA
Functional Tests
27
US