Check Function Of Lgdv; Tightness Check Of Lgdv With Universal Test Device; Checking The Closing Pressure - MSA G1 Operating Manual

b) The LGDV should NOT make any unusual sounds including whistling, chattering, or
popping
(9) Remove the full face mask from the face.
(10) Ensure that air flows freely.
(11) Push the LGDV release buttons.
a) Ensure that air flow stops.
5.4

Tightness Check of LGDV with Universal Test Device

Check that the LGDV is tight both without medium pressure and with medium pressure.
Without Medium Pressure
(1) Switch off LGDV.
(2) Connect LGDV to universal test device using the connecting adapter.
(3) Generate positive pressure of +7.5 mbar on test device and hold for 60 s.
The pressure change must not exceed 1 mbar in 60 seconds.
With Medium Pressure
(1) Switch off LGDV.
(2) Connect medium pressure line to a pressure reducer and open cylinder valve.
(3) Connect LGDV to universal test device using a connecting adapter.
(4) Observe pressure change.
The pressure change must not exceed 1 mbar in 60 seconds.
5.5

Checking the Closing Pressure

(1) Switch off LGDV and connect to medium pressure.
(2) Connect to test equipment via test adapter line.
(3) Close all lines of the test equipment.
WARNING!
Use a test adapter line to prevent damage to test equipment not protected against positive pres-
sure. Close the connection between LGDV and test equipment.
(4) Switch on LGDV by pushing the flush button.
(5) Open test adapter line.
a) Release a volume flow of 5 l/min through test equipment vent.
(6) Close vent.
The static pressure must be less than 3.9 mbar.
G1 Integrated SCBA System
Functional Tests
GB
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