Articles | Volume 13, issue 7
Atmos. Meas. Tech., 13, 3651–3660, 2020
https://doi.org/10.5194/amt-13-3651-2020
Atmos. Meas. Tech., 13, 3651–3660, 2020
https://doi.org/10.5194/amt-13-3651-2020

Research article 08 Jul 2020

Research article | 08 Jul 2020

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

Sergej Molleker et al.

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Latest update: 25 Feb 2021
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Short summary
A novel constant-pressure-inlet design for use in airborne aerosol particle mass spectrometry – an aerodynamic lens focuses aerosol particles into a vacuum chamber – is presented. The pressure of a few hectopascals at the lens is precisely controlled over a large flight altitude range up to 21 km. The constant pressure is achieved by changing the inner diameter of a properly scaled flexible O-ring acting as a critical orifice. Particle transmission at various inlet pressures is characterized.