Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

A prototype active end-of-service-life indicator for respirator cartridges.

Authors
Maclay-GJ; Yue-C; Findlay-MW; Stetter-JR
Source
Appl Occup Environ Hyg 1991 Aug; 6(8):677-682
NIOSHTIC No.
00201363
Abstract
A prototype device for indicating the end of service life of respirator cartridges was developed. The device consisted of a microsensor embedded in the charcoal bed of the cartridge that was electrically connected to a small low power producing module mounted on the face mask. The module triggered a flashing light emitting diode alarm that was visible to the user when 90% of the bed life was expended. The sensor consisted of a chemiresistor that was designed to produce a generic response to many of the contaminants that the face mask filter was supposed to remove and to operate at room temperature. It utilized a compensated bridge design to minimize the effects of changes in ambient temperature and relative humidity. The sensors were tested for their ability to respond to 100 to 4000 parts per million cyclohexane (110827) vapor. The initial response was rapid and the response time, defined as the time to reach 90% of the full signal, was on the order of 30 to 45 seconds. Relative response times as a percentage of the response time to cyclohexane measured for methylene-chloride (75092), benzene (71432), hexane (110543), carbon-tetrachloride (56235), acetone (67641), ethanol (64175), and methanol (67561) vapors were 100, 100, 85, 50, 5, 3, and 3%, respectively. The authors conclude that the prototype sensing system is an attractive and safer alternative to commonly used sensory warnings for indicating that the service life of respirator cartridges is approaching the end.
Keywords
NIOSH-Publication; NIOSH-Grant; Respirators; Chemical-cartridge-respirators; Warning-devices; Cycloalkanes; Organic-vapors; Laboratory-testing; Respiratory-protective-equipment;
CODEN
AOEHE9
CAS No.
110-82-7; 75-09-2; 71-43-2; 110-54-3; 56-23-5; 67-64-1; 64-17-5; 67-56-1;
Publication Date
19910801
Document Type
Journal Article
Funding Amount
399790.00
Funding Type
Grant
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R44-OH-02312
Issue of Publication
8
ISSN
1047-322X
Priority Area
Respirator Research; Respirators;
Source Name
Applied Occupational and Environmental Hygiene
State
IL
Performing Organization
Transducer Research, Inc., Naperville, Illinois
TOP