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|  MIL-S-4040F
4.7.17 Salt spray (see 3.6.10). Solenoids shall be tested in accordance with method 101 of MIL-STD-202. The
following details shall apply:
a.
Applicable salt solution: Five percent.
b.
Test condition letter: B.
c.
Measurements after exposure: After exposure, solenoids shall be washed, shaken, and air blasted, and
then permitted to dry for 24 hours at room temperature. They shall then be inspected for evidence of
corrosion, peeling, chipping, blistering of the finish, and exposure of base metal. The insulation resistance,
dielectric withstanding voltage (sea level), operating force (torque), compensated actuating voltage, and
deactuating voltage (or current) shall then be tested as specified in 4.7.3, 4.7.4, 4.7.2.1, 4.7.2.2, and
4.7.2.3, respectively.
4.7.18 Sand and dust (see 3.6.11). Solenoids shall be tested in accordance with method 110 of MIL-STD-202.
The following details shall apply:
a.
Test condition letter: A.
b.
Measurement: At the end of the test period, the operating force (torque), compensated actuating voltage,
and deactuating voltage (or current) shall be tested as specified in 4.7.2.1, 4.7.2.2, and 4.7.2.3,
respectively.
4.7.19 Explosion (see 3.6.12). Solenoids shall be tested in accordance with method 109 of MIL-STD-202. The
following details shall apply:
a.
Mechanical and electrical load: Rated voltage and no mechanical load.
b.
Chamber temperature condition: See 3.1.
4.7.20 Life (see 3.7). Measure the coil resistance. Solenoids shall then be tested for life cycle with specified load
(see 3.1). Each solenoid shall be connected to a load in the range of 95 percent to 100 percent of that specified for
the maximum operating force. Continuous duty rating solenoids shall be subjected to an ambient temperature of
25C 2C for a period of 168 hours with the coil energized with rated voltage (or current). Intermittent duty solenoids
shall be energized for 168 hours at 25C 2C ambient temperature and with a continuous voltage (or current) such
that the watts input shall be equal to the product of rated input watts times duty cycle. The solenoid shall then be
operated for a minimum of 25,000 operations: 12,500 at the maximum rated temperature and 12,500 at the minimum
rated temperature. The rate of cycling shall be 10 cycles per minute minimum with coil energized approximately 66
percent of the cycle and deenergized approximately 33 percent of the cycle. For intermittent duty solenoids, the duty
cycle shall be as specified (see 3.1). Following the test, the coil resistance shall be measured, and the insulation
resistance and dielectric withstanding voltage (at sea level) shall be as tested as specified in 4.7.3 and 4.7.4.1,
respectively.
4.7.21 Coil life (see 3.7.1).
4.7.21.1 Continuous duty solenoids. Unless otherwise specified (see 3.1), continuous duty solenoids shall be
subjected to 90 percent of maximum rated temperature with rated voltage applied to the coil for a period of 280 hours.
The solenoid shall be suspended by twine or other poor heat conducting material. Where the solenoid is a part of an
assembly and mounted thereon, the maximum rated temperature and rated voltage shall be applied. At the end of the
high temperature conditioning and while maintaining high temperature, the solenoids shall be cycled, unless
otherwise specified (see 3.1), at a rate of 2 seconds "on" and 2 seconds "off" for 5,000 cycles of operation.
4.7.21.2 Intermittent duty solenoids. Intermittent duty solenoids shall be cycled at the specified duty cycle
temperature rating and duration as specified (see 3.1). Following coil life and cycling, coil current, DC coil resistance,
insulation resistance, and dielectric withstanding voltage (sea level) shall be measured as specified in 4.7.2.5,
4.7.2.6, 4.7.3, and 4.7.4.1, respectively.
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