MIL-DTL-81219C
3.1.5 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the
transmitter except where magnetic materials are essential.
3.1.6 Non-ferrous materials. Non-ferrous materials shall be used for all parts of the
indicator except where ferrous materials are required.
3.1.7 Corrosive fumes. Materials used in the construction of the transmitter shall not
produce corrosive or deleterious fumes under the test conditions specified herein.
3.1.8 Protective treatment. When materials are used in the construction of the indicator
that are subject to deterioration when exposed to climatic and environmental conditions likely to
occur during service usage, they shall be protected against such deterioration in a manner that
will in no way prevent compliance with the performance requirements of this specification.
Protective coatings that will crack, chip, or scale with age or the extremes of climatic and
environmental conditions shall not be used.
3.2 Design and construction.
3.2.1 Design. The indicator shall be in accordance with the applicable MS drawing and
the requirements specified herein.
3.2.1.1 Size. The outline dimensions shall be in accordance with the applicable MS
drawing.
3.2.1.2 Indication. The type and characteristics of the indication of the elapsed time
shall be in accordance with the applicable MS drawing.
3.2.1.3 Sealing. Unless otherwise specified herein, the indicating cell shall be
hermetically sealed or fully encapsulated. The hermetic sealing or encapsulation shall be
accomplished such that the seal will not be dependent upon materials which will be adversely
affected by the action of any atmosphere to which the indicator may be subjected.
3.2.1.4 Scale. The indicator scale shall be in accordance with the applicable MS
drawing and 3.2.1.4.1 and 3.2.1.4.2.
3.2.1.4.1 Scale visibility. The scale shall be so designed that the full scale of the
indicator can be easily read at a distance of 18 inches. There shall be no objectionable shadow
on the graduated scale with general illumination and the indication cell shall be free from defects
that would prevent the indicator from being easily read. Such defects include but are not limited
to scratches, cracks and chips. This requirement applies both before and after the tests specified
herein.
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