Chang Gyu Woo1, Ki-Jung Hong1, Hak-Joon Kim1, Yong-Jin Kim1, Bangwoo Han 1, Jeongeun An2, Su Ji Kang3, Sung-Nam Chun3

Department of Environmental Machinery, Korea Institute of Machinery & Materials, Daejeon 34103, Korea
Parkor Korea Indus Co., Ltd., Seoul 08584, Korea
Clean Power Generation Laboratory, KEPCO Research Institute, Daejeon 34056, Korea

Received: August 29, 2018
Revised: August 29, 2018
Accepted: October 8, 2018
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Cite this article:
Woo, C.G., Hong, K.J., Kim, H.J., Kim, Y.J., Han, B., An, J., Kang, S.J. and Chun, S.N. (2019). Development and Performance Evaluation of a Porous Tube Dilutor for Real-time Measurements of Fine Particles in High-humidity Environments. Aerosol Air Qual. Res. 19: 461-466.


  • For measuring fine particles in the exhaust gas, porous tube dilutor was developed.
  • Through dilution in the sampling process, condensable particles were excluded.
  • Particles larger than 3 µm in diameter were successfully measured.
  • The dilutor can be used to continuous real-time monitoring PM10 and PM2.5.


Real-time measurement of fine particles in stack emission gases is an important component in continuous environmental monitoring of PM10 and PM2.5. We developed a porous tube dilutor (using both hot and cold dilution) to measure fine, but not condensable, particles in highly humid gas emissions and compared our device to a commercial ejector-type dilutor. Particle size distributions were measured in emissions from a diesel engine and a coal-fired boiler. The porous tube dilutor successfully measured particles in accumulation mode, including relatively large particles over 3 µm in diameter (without nuclei), whereas the ejector dilutor detected some condensable particles but could not detect large particles. The porous tube dilutor successfully removed condensed water droplets generated by a humidifier in a 30-m3 chamber.

Keywords: Sampling; PM10; PM2.5; Dilution; Condensable.


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