In-depth survey report: control technology for environmental enclosures - an evaluation of in-use enclosures at Nelson Manufacturing Company, Yuba City, California.
Heitbrink WA; Moyer E
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, ECTB 223-18a, 2000 Dec; :1-25
Optical particle counters were used to measure the aerosol concentration inside and outside of a modified Nelson Spray Cab. Testing was conducted to evaluate compliance with American Society of Agricultural Engineers Standard S525. For the S525 test, the tractor is driven over an unpaved surface for several hours to evaluate aerosol penetration into the cab. Two 8-channel optical particle counters are used to measure size-dependent dust concentrations inside and outside of the cab. This test is performed on a single cab. These test results were compared to a stationary test which could be performed on each cab. In the stationary test, the spray cab, which is mounted on a tractor, is set inside an enclosure. Aerosol, generated by burning incense sticks, is used to evaluate aerosol penetration into the cab. A single two-channel optical particle counter (model 227 A Met One, Pacific Scientific, Grants Pass, Oregon) is used to measure the aerosol concentration outside and inside the cab. The stationary and mobile test gave different results. These results are thought to be caused by the aerosol generation inside the cab and a relatively low concentration of particles outside of the cab during field S525 testing. Also, some optical particle counter measurements were biased due to the excessive aerosol concentrations. This source of experimental error can be addressed by fabricating a diluter from a capsule filter.
Aerosol-particles; Air-contamination; Air-quality; Air-quality-control; Silica-dusts; Particle-counters; Control-technology; Engineering-controls; Environmental-control; Standards; Agricultural-machinery; Tractors; Region-9
Field Studies; Control Technology
NTIS Accession No.
National Institute for Occupational Safety and Health