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ISO 21501: Determination of Particle Size Distribution
single particle light interaction methods


Included with ISO 21501, there are four parts

  • Part 1: Light scattering aerosol spectrometer (still undergoing preparation)
  • Part 2: Light scattering liquid-borne particle counter
  • Part 3: Light extinction liquid-borne particle counter
  • Part 4: Light scattering airborne particle counter for clean spaces

The documentation and approval of ISO 21501-2, -3, and -4 subsequently replaces and cancels ISO 13323-1:2000.

Read below to better understand ISO 21501-4, Light scattering airborne particle counter for clean spaces and to find particle counter solutions that meet this standard.

Contact us if you need more information or have questions.

Papers

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Click here to signup and download files (Understanding ISO 21501-4)

The ISO 21501 standard widens the scope of analysis to include methodology for airborne particle counting and liquid particle counting (both light scattering and extinction methods). Specifically, ISO 21501-4 provides a calibration procedure and verification method for airborne particle counters to ...

Download above file for full tables and figures, or for overview, see HTML Version.


Products

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Lasair III Particle Counter

Lasair® III Particle Counter

The Lasair® III particle counter is ISO 21501 compliant through the use of an on-board PHA. Its large IR touch screen with simplified user interface makes the new standard for particle counters.

Model

  • 310 B
  • 310 C
  • 350 L
  • 5100

First Channel

  • 0.3 µm
  • 0.3 µm
  • 0.3 µm
  • 0.5 µm

Flow Rate

  • 1 CFM
  • 1 CFM
  • 50 LPM
  • 100 LPM
Without Measurement There Is No Control
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