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Evaluation of a condensation particle counter for vehicle emission measurement: Experimental procedure and effects of calibration aerosol material |
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| Authors: | Xiaoliang Wang Robert Caldow Gilmore J. Sem Naoya Hama Hiromu Sakurai |
| Affiliation: | 1. TSI Inc., 500 Cardigan Road, Shoreview, MN 55126, USA;2. Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Pkwy, Reno, NV 89512, USA;3. Tokyo Dylec Corp., Naitoh-machi Bldg. 1, Naitoh-machi, Shinjuku-ku, Tokyo 160-0014, Japan;4. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan |
| Abstract: | A limit on particle number emission from the exhaust of Euro 5/6 engines will take effect in 2011 and engine exhaust particle number concentrations are required to be measured by particle number counters that meet requirements set forth by the UN/ECE particulate measurement programme (PMP). The TSI Model 3790 engine exhaust condensation particle counter (EECPC) was developed to meet these PMP requirements. This paper describes an experimental study that evaluated the performance of the EECPC. Experimental setup and procedures for calibrating EECPCs were evaluated. It was found that the EECPC counting efficiency strongly depended on the aerosol material. Among several materials tested, the counting efficiencies were highest for poly-α-olefin and lowest for sodium chloride. Errors in the concentration measurement due to the aerosol material dependence were estimated and found to be significant. Considerations for selecting aerosol materials for EECPC calibration are discussed with regard to best match with engine testing conditions. |
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