MIL-DTL-28788C
MIL-STD-202. The following details shall apply:
a. Switches shall be connected to a pressure source. Both the inlet and outlet ports shall be
connected in their normal manner. The outlet of the switch shall be capped off at a distance
away from the switch, sufficient so not to be affected by the temperature buildup. The
medium specified or an approved equivalent shall be used.
b. The point of impingement of the applied flame shall be midway between the electrical
connector and the pressure flow ports.
c. The flame shall be applied for 5 minutes.
d. Immediately after removal of the external flame, there shall be no residual flame from the unit
under test.
e. The flow rate shall then be increased to the actuation point plus 10 percent and maintained
for a period of not less than 20 minutes during which there shall be no evidence of leakage by
visual inspection.
4.7.23 Salt spray (corrosion) (see 3.27). Switches and their mounting hardware and brackets (if
applicable) shall be tested in accordance with method 101 of MIL-STD-202. The following details shall
apply
a. Test condition B.
b. Measurements after exposure Following the drying period, the switches shall meet the
requirements specified in 3.27. Mounting hardware shall be removed at the end of the test.
4.7.24 Burst pressure (see 3.28). Switches shall be connected to equipment capable of supplying
the specified medium (see 3.1), at a pressure which can be varied from zero to at least the burst pressure
specified. The downstream side of the switch or switch test chamber may be closed. The pressure shall
be increased from zero to the specified burst pressure at a rate not exceeding 1 percent per second. The
specified burst pressure shall be maintained for at least 10 minutes, and the switches shall be examined
for evidence of leakage. Following the burst pressure test, the switches shall be subjected to the test for
dielectric withstanding voltage as specified in 4.7.16.
5. PACKAGING
5.3 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
6.3
Intended use. Switches furnished under this specification are intended for use in applications
that require the sensing of air or liquid flow.
6.4 Acquisition requirements.
6.4.1 For category I switches. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Title, number, and date of the applicable specification sheet and the complete military part
number.
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