Preprints
https://doi.org/10.5194/egusphere-2022-1206
https://doi.org/10.5194/egusphere-2022-1206
 
17 Nov 2022
17 Nov 2022
Status: this preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).

Pressure-dependent performance of CEN-specified Condensation Particle Counters

Paulus S. Bauer, Dorian Spät, Martina Eisenhut, Andreas Gattringer, and Bernadett Weinzierl Paulus S. Bauer et al.
  • Aerosol Physics and Environmental Physics, Faculty of Physics, University of Vienna, 1090 Vienna, Austria

Abstract. One of the most important parameters to quantify an aerosol is the particle number concentration. Condensation Particle Counters (CPCs) are commonly used to measure the aerosol number concentration in the nanometer range. To compare the data from different measurement stations and campaigns it is important to harmonize the instrument specifications, which is why the Technical Specification CEN/TS 16976:2016 was introduced for CPCs. There, the parameters of the CEN-CPC are specified for standard pressure and temperature. However, CEN-CPCs are used in various surroundings, on high mountains or on airplanes, where they are exposed to low-pressure conditions. Here, we present the pressure-dependent performance (including the concentration linearity and counting efficiency) of two different models of CEN-CPCs, the Grimm 5410 CEN and the TSI 3772-CEN. We found that their performance at 1000 hPa and 750 hPa was in accordance with the CEN-technical-specifications. Below 500 hPa, the performance decreased for both CPC-models, but the decrease was different for the two models. To gain insight into the performance of the two CPC-models, we performed a simulation study. This study included simulations of the saturation profiles and calculations of internal particle losses within the CPCs. The simulations reproduced the overall performance decrease with decreasing pressure and reveal that the internal structure of the CPC has a significant influence on the performance. We anticipate our publication to provide a deeper understanding of the counting efficiency of CPCs and their pressure dependence. Our findings might be a starting point for new standards that include the pressure-dependent performance or they could help for designing new CPCs.

Paulus S. Bauer et al.

Status: open (until 03 Jan 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1206', Anonymous Referee #1, 23 Nov 2022 reply

Paulus S. Bauer et al.

Paulus S. Bauer et al.

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Short summary
Particle number concentration is one important parameter to quantify an aerosol. The aerosol number concentration in the nanometer range is commonly measured with Condensation Particle Counters (CPCs). A CEN Technical Specification harmonizes the CPC specifications. However, it is not specified for low-pressure conditions as on high mountains or on airplanes. Here, we present the pressure-dependent performance of two different models of CEN-CPCs, the Grimm 5410 CEN and the TSI 3772-CEN.