Functional Tests; Check That The Lgdv And Full Face Mask Can Hold A Negative Pressure (Before Use Only); Tightness Check Of The Pressure Reducer; Only) - MSA G1 Operating Manual

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.
If the SCBA has passed the visual inspection successfully, conduct the functional tests.
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 LGDV and Full Face Mask Can Hold a Negative Pressure (Before Use only)

(1) Connect compressed air cylinder (see chapter 11.3 "Changing the Cylinder") and open the
cylinder valve.
(2) Close the cylinder valve and purge any air from the system using the purge cover on the
LGDV.
(3) Hold the full face mask against the face to create an effective seal.
(4) Attach LGDV to the full face mask and inhale until the full face mask begins to collapse
against the face.
(5) Hold breath for approximately 10 seconds.
Negative pressure should be maintained and the full face mask should remain collapsed
against the face for the entire 10 seconds.
Do not use the SCBA if negative pressure cannot be maintained in the full face mask.
5.2

Tightness Check of the Pressure Reducer

(1) Connect compressed air cylinder (see chapter 11.3 "Changing the Cylinder").
(2) Open cylinder valve and check operating pressure on pressure gauge.
The pressure value must read minimum 270 bar for 300 bar cylinders.
(3) Close cylinder valve.
After 60 seconds the pressure drop in the pressure gauge must not exceed 10 bar.
(4) Check warning device (see chapter 5.6 "Control Module, Power Module, HUD, and Primary
Low-Pressure Warning Device Operation").
5.3 Check Function of LGDV (Before Use only)
(1) Push the release buttons on the side of the LGDV to ensure the LGDV is shut off.
(2) Open the cylinder valve and ensure the valve is completely open.
(3) If applicable: Observe the LED display.
The LEDs must illuminate in a sequenced pattern.
After the sequence is completed, the corresponding system pressure will be displayed.
(4) Attach the LGDV to the full face mask.
(5) Ensure proper attachment by pulling on the LGDV.
(6) Don the full face mask or hold the full face mask against the face to create an effective seal.
(7) Inhale sharply to start air flow.
(8) Breathe normally.
a) Ensure proper LGDV response.
G1 Integrated SCBA System
Functional Tests
GB
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