ISO 21501

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The ISO standard ISO 21501 describes a calibration method for measuring individual particles, but for different particle counters . It consists of four parts.

  • ISO 21501-1: Scattered light spectrometer for air applications
  • ISO 21501-2: Scattered light particle counter for water applications
  • ISO 21501-3: Extinction particle counter for water applications
  • ISO 21501-4: Scattered light particle counter for clean rooms

As a control of the particle size and number is indispensable in the pharmaceutical and chemical industry or in waterworks, for example, this standard was defined. Calibration in accordance with standards ensures that different devices deliver the same results.

ISO 21501 applies to particle sizes of around 0.06 µm - 100 µm, depending on the area of ​​application. Defined calibration particles are used to ensure reproducibility of the results. In addition to the size calibration, other important parameters for particle counters are specified in the standard (e.g. counting accuracy, flow rate, maximum particle concentration and calibration interval).

literature

  • ISO 21501-1: 2009 Determination of particle size distribution - Single particle light interaction methods - Part1: Light scattering aerosol spectrometer , ISO 2009, ( ISO 21501-1: 2009 Online )
  • ISO 21501-2: 2019 Determination of particle size distribution - Single particle light interaction methods - Part2: Light scattering liquid-borne particle counter , ISO 2007, ( ISO 21501-2: 2019 Online )
  • ISO 21501-3: 2019 Determination of particle size distribution - Single particle light interaction methods - Part3: Light extinction liquid-borne particle counter , ISO 2007, ( ISO 21501-3: 2019 Online )
  • ISO 21501-4: 2018 Determination of particle size distribution - Single particle light interaction methods - Part4: Light scattering airborne particle counter for clean spaces , ( ISO 21501-4: 2018 Online )