(주)에이피엠엔지니어링

시험환경 내 입자수에 대한 OPC, CNC 장비 간 마스크 밀착 성능비교

Fit Performance Comparison Between OPC and CNC Based on Number of Ambient Aerosol Particles

Abstract

Objectives: Fit performance may vary depending on the ambient aerosol number and ratio in respective test

environment. Although several instrument can measure it, they differ with respect to the measurement

principle and the range of ambient aerosols collected to calculate the fit factor.

Methods: In this study, the fit performance between a condensation nuclei counter(CNC) and an optical

particle counter(OPC) was compared according to ambient aerosol number concentration, and evaluated

consistency. One type respirators(N95 masks) was worn by 50 participants PortaCount®(Pro+ 8038) and

MT®(05U) were connected with one probe to one mask, and Fit Factors(FFs) were measured simultaneously.

Results: The interclass correlation coefficient of the fit factor and ambient aerosol number, as measured by

the two instrument, was 0.82 and 0.79, respectively, indicating a high consistency level. On the other hand

there was a significant correlation between the successful test performance of the OPC instrument and the

ambient aerosol number.

Conclusions: The test was passed with the CNC and OPC instruments when the ambient aerosol number was

635–3,332 particles/cm3 and 368–1,976 particles/cm3, respectively. Thus, the ideal ambient aerosol number of

particles differed between the two instrument.

Key words 

Ambient aerosol number concentration, CNC, Fit test, N95 mask, OPC

▶출처 : 한국산업보건학회지, 제32권 제2호(2022)