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  • BSI
    BS ISO 21501-4:2018 Determination of particle size distribution. Single particle light interaction methods - Light scattering airborne particle counter for clean spaces
    Edition: 2018
    $418.55
    / user per year

Description of BS ISO 21501-4:2018 2018

This document describes a calibration and verification method for a light scattering airborne particle counter (LSAPC), which is used to measure the size distribution and particle number concentration of particles suspended in air. The light scattering method described in this document is based on single particle measurements. The typical size range of particles measured by this method is between 0,1 μm and 10 μm in particle size.

Instruments that conform to this document are used for the classification of air cleanliness in cleanrooms and associated controlled environments in accordance with ISO 14644‑1 and ISO 14644‑2, as well as the measurement of number and size distribution of particles in various environments.

The following parameters are within the scope of this document:

  • size setting error;

  • counting efficiency;

  • size resolution;

  • false count;

  • maximum particle number concentration;

  • sampling flow rate error;

  • sampling time error;

  • response rate;

  • calibration interval;

  • reporting results from test and calibration.



Standard NumberBS ISO 21501-4:2018
TitleDetermination of particle size distribution. Single particle light interaction methods - Light scattering airborne particle counter for clean spaces
StatusWithdrawn
Publication Date2018-05-25
Withdrawn Date2023-02-13
ReplacesBS ISO 21501-4:2007
Identical National Standard OfISO 21501-4:2018
DescriptorsClean rooms, Light divergence, Particle size distribution, Air pollution, Test equipment, Calibration, Particulate air pollutants, Verification, Particle size measurement, Counting, Contaminants, Particulate materials, Optical measurement, Air
ICS19.120 Particle size analysis. Sieving
CommitteeLBI/37
ISBN978 0 580 86373 8
PublisherBSI
Pages34

The following editions for this book are also available...

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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