Citation

Fu S, Li Q, Hu J, Dong H. China Saf. Sci. J. 2020; 30(6): 37-42.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.06.006

PMID

unavailable

Abstract

In order to prevent harm caused by respiratory dust and to monitor mass concentration of individual exhalation dust, a portable personal concentration monitoring test prototype was developed by using infrared light emitting photodiode as a light source according to principle of light scattering, and its pneumatic control circuit and optical control and detection circuit were designed. Then, prototype and comparison instrument were put in a self-made dust test device together with dust gas which featured a flow rate of 2 L/ min and a particle size of 5 μm. The results show that when mass concentration of dust is between 0-150 mg/ m3, measured voltage of prototype increases along with increase of dust concentration, and they maintain a good linear relationship. The relative error between measured concentration value of prototype by using regression equation and that of comparison instrument is within ±4%, indicating that the device meets requirements of relevant dust verification regulations. © 2020 China Safety Science Journal. All rights reserved.

Language: zh