Step 11.
Position purge device LEAK TEST/PURGE switch (10) to LEAK TEST and
observe that the purge device gauge (9) indicates a steady reading of 3 1 PSI. If
unable to observe a steady reading of 3 1 PSI, a leak is present. Stop purge
procedure and seal night vision device leak(s). If purge device gauge (9) indicates
a steady pressure, position purge device LEAK TEST/PURGE switch (10) to
PURGE.
Step 12.
Repeat steps 8 through 11 three additional times.
Step 13.
Set purge device (8) PUMP/NITROGEN switch (11) to PUMP and LEAK
TEST/PURGE (10) switch to PURGE.
Step 14.
Remove the air chuck from the viewer pressure valve and screw on pressure valve
cap. Tighten firmly finger tight.
Step 15.
Prepare for continued purge/fill procedure or remove purging adapter (7), turn off
nitrogen tank valve (5) and remove and store fire control tool set (2) and purge
device (8).
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