Record Keeping; Functional Tests; Regulator And Facepiece Hold Negative Pressure; Regulator Operation - MSA G1 SCBA Operating Manual

4.13 Record Keeping

When inspection is complete, record the date of the inspection and the initials of the designated
inspector. To make a more detailed record of the operations performed, use an MSA Inspection and
Maintenance Checklist for Self-Contained Breathing Apparatus (P/N 492329). When the inspection
data has been recorded, the SCBA is ready for functional tests.
5

Functional Tests

WARNING!
If the SCBA does not operate correctly for all functional tests, remove the SCBA from service. Make
sure an MSA trained and certified repair technician corrects the unsatisfactory condition before
returning the SCBA to service. Failure to obey this warning can result in serious personal injury or
death.
NOTE: The cylinder must be full during functional tests. Before starting the functional tests, look at the
pressure gauge on the cylinder valve assembly to make sure the cylinder is full.
If the SCBA passes all visual inspections successfully, do the functional tests daily and after each use.
If any part of the SCBA fails the functional test, remove the SCBA from service and return it to a certi-
fied repair technician.
5.1

Regulator and Facepiece Hold Negative Pressure

(1) Turn the handwheel clockwise to close the cylinder valve.
(2) Turn the regulator bypass knob counterclockwise to open the regulator bypass valve, or if
equipped, push the purge button, to release all pressure from the SCBA.
(3) Hold the facepiece against the face to create an effective seal.
(4) Attach the regulator to the facepiece.
(5) Inhale until the facepiece begins to collapse against the face.
(6) Hold your breath for approximately 10 seconds. The facepiece should stay collapsed against the
face for the entire 10 seconds, holding negative pressure.
(7) If the facepiece cannot hold negative pressure, remove the SCBA from service.
5.2

Regulator Operation

(1) Push the release buttons on the top and bottom of the regulator to make sure the regulator is off.
(2) Turn the regulator bypass knob clockwise to make sure the regulator bypass valve is fully closed.
(3) Turn the handwheel counterclockwise to open the cylinder valve.
(4) Monitor the LED display. Make sure the LEDs come on in a sequenced pattern. When the
sequence is complete, the corresponding system pressure will show.
(5) Turn the regulator bypass knob counterclockwise to open the regulator bypass valve.
(6) Make sure air flows from the regulator.
(7) Turn the regulator bypass knob clockwise to close the regulator bypass valve.
(8) Don the facepiece or hold the facepiece against the face to create an effective seal.
(9) Attach the regulator to the facepiece.
G1 SCBA 2018 Edition
Functional Tests
27
US