MIL-PRF-38715B
3.1 First article. When specified (see 6.2), a sample(s) shall be subjected to first article
inspection in accordance with 4.2.
3.2 Materials. The contractor shall select the materials, but the materials shall be capable of
meeting all of the operational and environmental requirements specified herein. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent possible
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs.
3.2.1 Metals. Metals shall be of the corrosion-resistant type and/or be suitably treated to resist
corrosion during normal service life. Materials contained within hermetically sealed enclosures
are considered to be suitably protected from corrosion. Requirements specified for
fungicidal and
corrosion protective treatment, anodizing of aluminum alloy parts, and nickel plating of steel parts
are not applicable for parts within hermetically sealed instruments. Stainless steel parts, steel
parts that have been nickel plated, and aluminum alloy parts that have been anodized, shall be
further protected against corrosion if necessary.
3.2.2 Fungus-proof materials Materials which are not nutrients for fungi shall be used to the
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greatest extent practicable. In cases where materials that are nutrients for fungi must be used,
such materials shall be treated with a
fungicidal agent.
3.2.3 Protective treatment When materials are used in the construction of the indicator that
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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. The usage of
any protective coating that will crack, chip, or scale with age or extremes of climatic and
environmental conditions shall be avoided.
3.2.4 Explosive resistance The indicator shall be constructed intrinsically safe for Class I,
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Division 1, Group A, B, C and D locations (as defined by National Fire Protection Association
Code 70 Article 500).
3.3 Physical characteristics
3.3.1 Weight. The total weight of the indicator, both types, including batteries shall not exceed
20 pounds.
3.3.2 Dimensions.The indicator shall not be larger than 2 feet in any dimension.
3.3.3 Controls. The indicator shall be provided with a control(s) for obtaining the initial zero
setting of the indicator and shall have a control(s) for changing the sensitivity (ranges) of the
indicator. When set, controls shall not be accidentally disturbed. Controls must be usable with
cold weather gear gloves.
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