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Development of a prototype service-life indicator for organic vapor respirators.

Stricoff RS; Lindsay DB; Grain CF; Cohen ML; Loeffler H; Smith EM; Sidman KR
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 78-170, 1978 Aug; :1-57
A NIOSH sponsored effort to develop and test a prototype service life indicator for organic vapor air purifying respirators is reported. A series of performance requirements for an end of service life indicator (ESLI) was developed which addressed indicator characteristics, specificity, reliability, respirator fit, weight, impairment of vision, durability, breathing resistance, temperature and humidity, electrical components, and toxic materials. A theoretical evaluation of various detection approaches was conducted to select a specific developmental approach. It was found that the metal oxide gas sensor (MOGS) merited further assessment because of its low cost, commercial availability and desirable nonspecificity. Also, catalytic oxidation was studied. Experimental evaluation showed that the MOGS responded to a large number of organic vapors within a relatively small concentration range. A prototype ESLI incorporating the MOGS was designed and constructed. The device consisted of a belt or shirt pocket mounted battery pack connected to a detector/indicator unit fitted between the respirator facepiece and the chemical cartridge. It is recommended that the ESLI be tested under actual use conditions, and that the MOGS detector be tested against additional challenge atmospheres.
NIOSH-Contract; Contract-210-76-0163; Personal-protective-equipment; Safety-equipment; Air-quality-control; Respiratory-protective-equipment; Protective-equipment
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DHEW (NIOSH) Publication No. 78-170; Contract-210-76-0163
NIOSH Division
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National Institute for Occupational Safety and Health
Page last reviewed: December 11, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division