This specification covers semi-portable frost/dew point monitors used to determine the moisture content of shipboard compressed air systems.

Monitors shall be of the following types and pressure ranges as specified.

Monitor types shall be as follows:

Chilled surface monitor (CSM) - dew point temperature determined by visual or automatic detection of vapor condensation on a chilled mirror surface exposed to sample air (see 6.2).

Direct reading hygrometer (DRH) - dew point temperature determined by measuring the electrical properties of a sensing device exposed to sample air (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 55Z3, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

Pressure ranges for either type shall be as follows:

Low pressure (LP)- 1 to 150 pounds per square inch (lb/in²).

High pressure (HP)- 3,000 to 5,000 lb/in² (see 6.2).