A Vapor Challenge Method of Measuring the Residual Life of Gas Filters
Abstract
A residual filter life test has been developed involving the use of a weakly adsorbed vapor to 'count' available adsorption sites. The method was developed for military filters containing ASC carbon to determine when the physical adsorption capacity of a filter had been depleted to the extent that change-out is required. The procedure requires measurement of the time for a challenge chemical (ammonia) to appear in the filter effluent with a correction factor being applied based on the temperature and relative humidity of the airflow through the filter. The procedure is best suited for collective protection filters but could also be applied to gas mask canisters. A correlation between breakthrough time and residual adsorption capacity must be experimentally determined for each filter design. Work remains to be performed to demonstrate the test procedure on an actual filter system and to determine the correlation for each type of filter. (sdw)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA227711
Entities
People
- Terrence C. Mcdonald
- Thomas W. Mix