TM 9-4120-385-14
(c) Connect a nitrogen cylinder to the pressure switch line.
NOTE
The nitrogen cylinder gauge should be calibrated from 0 to 1000 psig.
the pressure switch. No continuity on the multimeter should be indicated.
(e) Slowly increase the nitrogen pressure. The switch should trip at 405 psig +/
17 psig. The switch tripping will be indicated by a break in continuity on the multimeter.
Replace switch if it does not operate within tolerances.
(f) Reduce the nitrogen pressure to 350 psig while observing the multimeter.
Continuity on the multimeter should be indicated.
(g) Slowly decrease the nitrogen pressure. The switch should trip at 285 psig +/
17 psig. The switch tripping will be indicated by a break in continuity on the multimeter.
Replace switch if it does not operate within tolerances.
c.
REMOVAL.
1. Remove four screws retaining instruction plate and switch enclosure (4).
NOTE
Hold enclosure when removing hardware.
2. Remove two screws (1) and lockwashers (2) securing switch (3).
3. Carefully remove the switch (3) from the enclosure (4).
4. Pull sensing line through grommet.
d.
INSTALLATION.
1. Place switch (3) and sensing line in unit. Excess sensing line should be coiled and
secured with 1inch tape.
2. Carefully feed sensing line through grommet.
3. Mount switch (3) inside enclosure (4) and secure with two screws (1) and
4. Mount enclosure (4) and instruction plate with four screws (5).
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