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
Repeat steps 8 through 11 three additional times.
Set purge device (8) PUMP/NITROGEN switch (11) to PUMP and LEAK
TEST/PURGE (10) switch to PURGE.
Remove the air chuck from the viewer pressure valve and screw on pressure valve
cap. Tighten firmly finger tight.
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