Secure pressure regulator (1) to a tank containing
If registered pressure is 100 psi (689.48 kPa)
or less, obtain a replacement.
Open nitrogen tank valve (2) and observe pressure
gage (3). Gage should indicate pressure in nitro-
Adjust pressurized regulator by rotating handle (4)
until pressure gage (5) indicates 5 psi (34.47 kPa).
Circuit card assembly must be removed from
M1 18A3 elbow telescope level assembly prior
to securing on fabricated leak test adapter
Secure level assembly (6) to fabricated leak test
adapter (7) with four machine screws (8) and four
wing nuts (9).
Connect hose assembly (10)to the inlet port (11 )
on fabricated leak test adapter (7).
Adjust handle (4) counterclockwise until 1 psi (6.89
kPa) is registered on the low pressure gage (5).
Maintain a 1-psig (6.89-kPa) pressure for 10 sec-
onds; then adjust handle (4) clockwise to the
Disconnect hose assembly (10) from the inlet port
(11 ) and lay hose assembly (10) aside.
Completely immerse level assembly (6) and fabri-
cated leak test adapter (7) in a container of clear
While level assembly is immersed inspect the
areas around the level (12) vial and lamp shell (13)
for air bubbles that indicate pressure leaks.