BS ISO 21501-4:2007 - Determination of particle size distribution. Single particle light interaction methods. Light scattering airborne particle counter for clean spaces – BSI British Standards

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BS ISO 21501-4:2007

Determination of particle size distribution. Single particle light interaction methods. Light scattering airborne particle counter for clean spaces

Status : Current, Under review   Published : August 2007

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PDF

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HARDCOPY



BS ISO 21501-4:2007 Determination of particle size distribution. Single particle light interaction methods. Light scattering airborne particle counter for clean spaces

Monitoring particle contamination levels is required in various fields, e.g. in the electronic industry, in the pharmaceutical industry, in the manufacturing of precision machines and in medical operations. Particle counters are useful instruments for monitoring particle contamination in air. The purpose of this part of ISO 21501 is to provide a calibration procedure and verification method for particle counters, so as to minimize the inaccuracy in the measurement result by a counter, as well as the differences in the results measured by different instruments.  

Part 4 of BS ISO 21501 describes a calibration and verification method for a light scattering airborne particle counter (LSAPC), which is used to measure the size and particle number concentration of particles suspended in air. The light scattering method described in this part of ISO 21501 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 part of BS ISO 21501 are used for the classification of air cleanliness in cleanrooms and associated controlled environments in accordance with BS EN ISO 14644-1, as well as the measurement of number and size distribution of particles in various environments.

The following are within the scope of this part of BS ISO 21501:

  • Size calibration
  • Verification of size setting
  • Counting efficiency
  • Size resolution
  • False count rate
  • Maximum particle number concentration
  • Sampling flow rate
  • Sampling time
  • Sampling volume
  • Calibration interval
  • Test report.

Contents of BS ISO 21501-4 includes:

  • Terms and definitions
  • Requirements
  • Size calibration
  • Verification of size setting
  • Counting efficiency
  • Size resolution
  • False count rate
  • Maximum particle number concentration
  • Sampling flow rate
  • Sampling time
  • Response rate
  • Calibration interval
  • Test report
  • Test method
  • Uncertainty of particle size calibration
  • Bibliography



Standard NumberBS ISO 21501-4:2007
TitleDetermination of particle size distribution. Single particle light interaction methods. Light scattering airborne particle counter for clean spaces
StatusCurrent, Under review
Publication Date31 August 2007
Cross ReferencesISO 9276-1, ISO 14644-1, ASTM F50-92, ASTM F328-98, ASTM F649-01, JIS B 9921:1997, GUM:1995
ReplacesBS ISO 13323-1:2000
International RelationshipsISO 21501-4:2007
Draft Superseded By05/30137700 DC
DescriptorsParticulate materials, Optical measurement, Verification, Test equipment, Counting, Light divergence, Air pollution, Contaminants, Calibration, Particulate air pollutants, Clean rooms, Air, Particle size measurement, Particle size distribution
ICS19.120
Title in FrenchDetermination de la distribution granulometrique. Methodes Détermination de la distribution granulométrique. Méthodes d'interaction lumineuse de particules uniques. Compteur de particules en suspension dans l'air en lumière dispersée pour espaces propres
Title in GermanBestimmung der Partikelgrößenverteilung. Partikelmessung durch Lichtstreuung an Einzelpartikeln. Luft-Streulichtpartikelzähler für Reinräume
CommitteeLBI/37
ISBN978 0 580 55678 4
PublisherBSI
FormatA4
DeliveryYes
Pages26
File Size627 KB
Price£170.00


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