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Norm

ISO 21501-4:2007

Issue date: 2007 05 07

Determination of particle size distribution — Single particle light interaction methods — Part 4: Light scattering airborne particle counter for clean spaces

ISO 21501-4:2007 describes a calibration and verification method for a light scattering airborne particle counter (LSAPC), which is used to measure the size and particle ...
Withdrawn: 2018 05 18
Publisher:
International Organization for Standardization
Format:
Digital | 16 Pages
Language:
English

ISO 21501-4:2007 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 ISO 21501-4:2007 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 ISO 21501-4:2007 are used for the classification of air cleanliness in cleanrooms and associated controlled environments in accordance with 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 ISO 21501-4:2007:

  • 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.
ISO 21501-4:2018
2018 05 18
Determination of particle size distribution — Single particle light interaction methods — Part 4: Li...
Norm
ISO 21501-4:2007
2007 05 07
Determination of particle size distribution — Single particle light interaction methods — Part 4: Li...
Norm
ISO 13323-1:2000
2000 11 02
Determination of particle size distribution — Single-particle light interaction methods — Part 1: Li...
Norm
Norm
ISO 21501-4:2018
Issue date : 2018 05 18
Determination of particle size distribution — Single particle light interaction methods — Part 4: Light scattering airborne particle counter for clean spaces