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  Application of an O-ring pinch device as a constant-pressure inlet (CPI) for airborne sampling

Molleker, S., Helleis, F., Klimach, T., Appel, O., Clemen, H.-C., Dragoneas, A., et al. (2020). Application of an O-ring pinch device as a constant-pressure inlet (CPI) for airborne sampling. Atmospheric Measurement Techniques, 13(7), 3651-3660. doi:10.5194/amt-13-3651-2020.

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 Creators:
Molleker, Sergej1, Author           
Helleis, Frank2, Author           
Klimach, Thomas3, Author           
Appel, Oliver2, Author           
Clemen, Hans-Christian1, Author           
Dragoneas, Antonis1, Author           
Gurk, Christian4, Author           
Hünig, Andreas1, Author           
Köllner, Franziska1, Author           
Rubach, Florian1, Author           
Schulz, Christiane1, Author           
Schneider, Johannes1, Author           
Borrmann, Stephan1, Author           
Affiliations:
1Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              
2Max Planck Institute for Chemistry, Max Planck Society, ou_1826284              
3Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              
4Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: We present a novel and compact design of a constant-pressure inlet (CPI) developed for use in airborne aerosol mass spectrometry. In particular, the inlet system is optimized for aerodynamic lenses commonly used in aerosol mass spectrometers, in which efficient focusing of aerosol particles into a vacuum chamber requires a precisely controlled lens pressure, typically of a few hectopascals. The CPI device can also be used in condensation particle counters (CPCs), cloud condensation nucleus counters (CCNCs), and gas-phase sampling instruments across a wide range of altitudes and inlet pressures. The constant pressure is achieved by changing the inner diameter of a properly scaled O-ring that acts as a critical orifice. The CPI control keeps air pressure and thereby mass flow rate (≈0.1 L min−1) upstream of an aerodynamic lens constant, deviating at most by only ±2 % from a preset value. In our setup, a pressure sensor downstream of the O-ring maintains control of the pinch mechanism via a feedback loop and setpoint conditions are reached within seconds. The device was implemented in a few instruments, which were successfully operated on different research aircraft covering a wide range of ambient pressures, from sea level up to about 55 hPa. Details of operation and the quality of aerosol particle transmission were evaluated by laboratory experiments and in-flight data with a single-particle mass spectrometer.

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Language(s): eng - English
 Dates: 2020-07-08
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000548519300002
DOI: 10.5194/amt-13-3651-2020
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Title: Atmospheric Measurement Techniques
  Abbreviation : AMT
Source Genre: Journal
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Publ. Info: Göttingen : European Geosciences Union, Copernicus
Pages: - Volume / Issue: 13 (7) Sequence Number: - Start / End Page: 3651 - 3660 Identifier: ISSN: 1867-1381
CoNE: https://pure.mpg.de/cone/journals/resource/1867-1381