ISO 21501-4:2007

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

Standard Details

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.

General Information

Status : WITHDRAWN

Standard Type: Main

Document No: ISO 21501-4:2007

Document Year: 2007

Pages: 16

Edition: 1

Section Volume:
ISO/TC 24/SC 4. Particle characterization

ICS:
19.120 Particle size analysis. Sieving

Preview Document

Life Cycle

Published

ISO 21501-4:2018

Currently Viewing

WITHDRAWN

ISO 21501-4:2007

ISO 21501-4:2007

Standard Details

General Information

Life Cycle

Add Standards To Trackedge

Enquiry Form