ISO 27891:2015 PDF

Scope: This International Standard describes methods to determine the detection efficiency of condensation particle counters (CPCs) at particle number concentrations ranging between 1 cm-3 and 105 cm-3, together with the associated measurement uncertainty. In general, the detection efficiency will depend on the particle number concentration, the particle size, and the particle composition. The particle sizes covered by the methods described in this International Standard range from approximately 5 nm to 1000 nm. The methods can therefore be used both to determine a CPC calibration factor to be applied across the range of larger particle sizes where the detection efficiency is relatively constant (the plateau efficiency), and to characterize the drop in CPC detection efficiency at small particle sizes, near the lower detection limit. These parameters are described in more detail in Annex A. The methods are suitable for CPCs whose inlet flows are between approximately 0,1 l/min and 5 l/min. This International Standard describes a method for estimating the uncertainty of a CPC calibration performed according to this International Standard.

ISO 27891:2015 Referenced Document

ISO 15900:2009 Determination of particle size distribution - Differential electrical mobility analysis for aerosol particles
ISO 21501-1:2009 Determination of particle size distribution - Single particle light interaction methods - Part 1: Light scattering aerosol spectrometer
ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories
ISO/IEC Guide 99:2007 International vocabulary of metrology - Basic and general concepts and associated terms (VIM)
VDI 3491 Blatt 4-1980 Particulate matter measurement; generation of test aerosols; Sinclair-La Mer-generator

2015 ISO 27891:2015 Aerosol particle number concentration - Calibration of condensation particle counters