Preprints
https://doi.org/10.5194/ar-2023-16
https://doi.org/10.5194/ar-2023-16
13 Nov 2023
 | 13 Nov 2023
Status: a revised version of this preprint is currently under review for the journal AR.

Influence of soot aerosol properties on the counting efficiency of PN-PTI instruments

Tobias Hammer, Diana Roos, Barouch Giechaskiel, Anastasios Melas, and Konstantina Vasilatou

Abstract. In this work, we investigated the influence of different types of soot aerosol on the counting efficiency (CE) of instruments employed for the periodic technical inspection (PTI) of diesel vehicles. Such instruments report particle number (PN) concentration. Combustion aerosols were generated by a prototype bigCAST, a miniCAST 5201 BC, a miniCAST 6204 C and a miniature inverted soot generator (MISG). For comparison purposes, diesel soot was generated by a Euro 5b diesel test vehicle with by-passed diesel particulate filter (DPF). The size-dependent counting efficiency profile of six PN-PTI instruments was determined with each one of the aforementioned test aerosols. The results showed that the type of soot aerosol affected the response of the PN-PTI sensors in an individualised manner. Consequently, it was difficult to identify trends and draw conclusive results about which laboratory-generated soot is the best proxy for diesel soot. Deviations in the counting efficiency remained typically within 0.25 units when using laboratory-generated soot compared to Euro 5b diesel soot of similar mobility diameter (~50–60 nm). Soot with a mobility diameter of ~100 nm generated by the MISG, the lowest size we could achieve, resulted in similar counting efficiencies as that generated by the different CAST generators for most of the PN-PTI instruments, showing that MISG may be a satisfactory – and affordable- option for PN-PTI verification.

Tobias Hammer, Diana Roos, Barouch Giechaskiel, Anastasios Melas, and Konstantina Vasilatou

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on ar-2023-16', O. F. Bischof, 16 Nov 2023
    • AC1: 'Reply on CC1', Konstantina Vasilatou, 20 Nov 2023
  • CC2: 'Comment on ar-2023-16', Martin Fierz, 26 Dec 2023
  • RC1: 'Comment on ar-2023-16', Anonymous Referee #1, 14 Jan 2024
  • RC2: 'Comment on ar-2023-16', Anonymous Referee #2, 19 Jan 2024
Tobias Hammer, Diana Roos, Barouch Giechaskiel, Anastasios Melas, and Konstantina Vasilatou
Tobias Hammer, Diana Roos, Barouch Giechaskiel, Anastasios Melas, and Konstantina Vasilatou

Viewed

Total article views: 236 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
175 47 14 236 17 3 5
  • HTML: 175
  • PDF: 47
  • XML: 14
  • Total: 236
  • Supplement: 17
  • BibTeX: 3
  • EndNote: 5
Views and downloads (calculated since 13 Nov 2023)
Cumulative views and downloads (calculated since 13 Nov 2023)

Viewed (geographical distribution)

Total article views: 233 (including HTML, PDF, and XML) Thereof 233 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 22 Feb 2024
Download
Short summary
More than 35'000 particle counters designed for the periodic technical inspection of diesel engine exhaust have been placed on the European market in the past few years. This work shows that the counting efficiency of these instruments depend on the properties of the test aerosols, even if all of them are combustion-based soot of similar mobility diameter. The aim of this study is to promote harmonisation of measurement procedures in the field of emission control.
Altmetrics