MIL-DTL-24236/16G
Method for quality conformance inspection: Go-no-go test procedure (type II). The switch shall be inserted into a
standard high temperature test block, and the switch terminals connected to a relay coil. The relay contacts shall
control the power to the test block heater and operate a lamp to indicate when the switch contacts transfer. The
switch shall be allowed to cycle "on and off", a minimum of ten(10) cycles. The operating temperature of the
switch will be determined by observing the temperature at the time of contact closure as indicated by the lamp.
The operating temperature of the switch shall be within the tolerances listed in table I.
Sensitivity response: Applicable.
Temperature anticipation: Applicable.
Watertight seal: Applicable to switch contact chamber with the following exceptions: The switch contact chamber
shall be immersed up to but not to include the mounting flange. A vacuum shall be drawn to an absolute pressure
of 0 inch to 6 inches of Mercury. This pressure shall be maintained for a minimum of one minute. Any evidence of
continuous stream of bubbles from within the contact chamber shall be cause for failure.
Dielectric withstanding voltage: Test voltage 500 V rms, current flow not to exceed 100 microamperes.
Insulation resistance: Not less than 2 megohms.
Contact resistance: Not applicable.
Thermal shock: Method 107 of MIL-STD-202, test condition E, except low temperature shall be -65°F and following
the test shall be within ±25°F of the pretest temperature setting following the test.
Terminal strength: Method 211 of MIL-STD-202. Test conditions A and E, with 25 inch-pounds for condition E.
Moisture resistance: Measurements shall be taken upon completion of tests and again after switches have dried.
Insulation resistance shall be not less than 2 megohms.
Flame response: Applicable. Flame tests shall be conducted using the flame test burner, see figure 2. The flame
shall completely envelop the sensing element of the switch. Starting ambient for flame response shall be a
minimum of 200°F below switch operating temperature, or room ambient, whichever is greater. The switch shall be
cooled to this ambient following each exposure. All flame temperatures shall be measured by using an 18-gauge
wire thermocouple. The thermocouple bead shall be at the center of the flame and the two wires leading to the
bead shall be parallel and shall extend for a distance of 3 inches horizontally into the flame. The vertical distance
between the flame and the thermocouple shall be the same as that between the flame and the test article.
Vibration: Monitor for contact closure or opening, as applicable, during resonance search. There shall be no
loosening of terminal hardware. Calibration check after testing shall be within ±25°F of pretest temperature setting.
Shock: Applicable. Testing to be conducted at room ambient and without electrical load and thermal conditions.
No measurements to be taken during testing. Calibration test at conclusion shall be within ±25°F of pretest
temperature setting.
Endurance: 2,000 cycles. Final setting to within ±30°F of pretest of temperature setting.
Sand and dust: Not applicable.
Test sampling: Fifteen sample units shall be subject to qualification testing. They shall be set, 5 each, to 215°F,
600°F, and 900°F, prior to the start of testing. For quality conformance inspection, every fifth sample unit
undergoing the inspection shall be set to 250°F, tested, reset to 900°F, and tested. The applicable terminal
hardware shall be installed on each sample unit prior to testing, and shall be kept on throughout the tests.
Part or Identifying Number (PIN): M24236/16- (dash number from table I).
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