TM 9-1240-401-34&P
Secure pressure regulator (1) to a tank containing
1
pressurized nitrogen.
If registered pressure is 100 psi (689.48 kPa)
or less, obtain a replacement.
2
Open nitrogen tank valve (2) and observe pressure
gage (3). Gage should indicate pressure in nitro-
gen tank.
Adjust pressurized regulator by rotating handle (4)
3
until pressure gage (5) indicates 5 psi (34.47 kPa).
4
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
5
adapter (7) with four machine screws (8) and four
wing nuts (9).
6
Connect hose assembly (10)to the inlet port (11 )
on fabricated leak test adapter (7).
7
8
Adjust handle (4) counterclockwise until 1 psi (6.89
kPa) is registered on the low pressure gage (5).
9
Maintain a 1-psig (6.89-kPa) pressure for 10 sec-
onds; then adjust handle (4) clockwise to the
closed position.
Disconnect hose assembly (10) from the inlet port
10
(11 ) and lay hose assembly (10) aside.
11
Completely immerse level assembly (6) and fabri-
cated leak test adapter (7) in a container of clear
water.
12
While level assembly is immersed inspect the
areas around the level (12) vial and lamp shell (13)
for air bubbles that indicate pressure leaks.
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