MIL-DTL-12211G
4.7 Methods of inspection.
4.7.1 Materials and construction. Conformance to 3.2, 3.2.1, and 3.3 shall be determined by inspection
of contractor records providing proof or certification that design, construction, processing, and materials
conform to requirements. Applicable records shall include drawings, specifications, design data,
receiving inspection records, processing and quality control standards, vendor catalogs and certifications,
industry standards, test reports, and rating data.
4.7.2 Defects. Conformance to 3.3 through 3.3.2, 3.7, and 3.9 shall be determined by examination for
the defects listed in table V. Examination shall be visual, tactile, or by measurement with standard
inspection equipment.
4.7.3 Calibration.
4.7.3.1 Type I switches. To determine conformance to 3.4.1.1, type I switches shall be subjected to
the following procedure: Starting at a pressure 10 psi above the upper actuation pressure specified on
the applicable MS standard or drawing, the pressure shall be gradually decreased to a point 10 psi below
the lower actuation pressure specified. For switches where minimum operating pressure is 10 psi or less,
the lower test pressure shall be zero psi. The pressure shall then be increased to the point 10 psi above
the upper pressure specified. During both phases of the operational cycle, a light tapping of the switch, to
cause actuation, is permissible. The point at which the switch opens and closes shall be recorded.
4.7.3.2 Type II switches. To determine conformance to 3.4.1.2, type II switches shall be subjected to
the following procedure: Starting at a pressure 10 psi below the lower actuation pressure specified on the
applicable MS or drawing, the pressure shall be gradually increased to a pressure 10 psi above the upper
actuation pressure specified. The pressure shall then be decreased to the point 10 psi below the lower
actuation pressure specified. For switches where the minimum actuation pressure is 10 psi or less, the
lower test pressure shall be zero psi. During both phases of the operational cycle, a light tapping of the
switch, to cause actuation, is permissible. The point at which the switch closes and opens shall be
recorded.
4.7.4 Terminal strength. To determine conformance to 3.4.2, the switch shall be securely mounted. A
cable with a suitable mating connection shall be attached to each switch terminal. The force, specified in
3.4.2, shall be applied to each cable in a direction perpendicular to the terminal connector pin. Confirm
that no damage to the switch body is evidenced and that there is not more than .062 inch (1.57 mm)
deformation to the terminals. Subsequently the switch shall be subjected to the applicable test of 4.7.3 to
verify performance.
4.7.5 Pressure overload. To determine conformance to 3.4.3, the switch shall be subjected to the
specified overload for 1 minute. Subsequently, the switch opening and closing pressure shall be
determined, and shall be within 8 percent of the specified values.
4.7.6 High voltage. To determine conformance to 3.4.4, with the switch contacts open, 220 V rms at
60 Hz shall be applied for 1 minute between each terminal and the switch body. If there are two
terminals, the same voltage shall be applied for 1 minute between each separate terminal and the non-
current-carrying part of the switch, with the switch contacts open.
4.8 Environmental conditions.
4.8.1 Corrosion resistance. To determine conformance to 3.5.1, the switch shall be subjected to 200
hours of salt spray in accordance with ASTM B117. Subsequently, the switch shall pass the tests of 4.7.6
and 4.7.3.
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