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ISO 21501-1:2025

Determination of particle size distribution - Single particle light interaction methods - Part 1: Light scattering aerosol spectrometer

This document specifies characteristics of a light scattering aerosol spectrometer (LSAS) which is used for measuring the size, number concentration and number-based size distribution of particles suspended in a gas. This document provide the calibration procedure and the validation method for aerosol spectrometers.

 

This document applies to:

 

    characterization of metered dose inhalers (MDI), dry powder inhalers (DPI) and nebulizers in pharmacy;

 

    production control of active agents;

 

    cut-off determination: impactors, cyclones and impingers;

 

    atmospheric aerosols: bio-aerosols, stables or composting facilities, nebulized droplets, measurements in street tunnels;

 

    fractional separation efficiency determination of filters.

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International Organization for Standardization [iso]

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