Particle size distribution, Particle size measurement, Particulate materials, Light divergence, Grain size

Particle size distribution, Particle size measurement, Particulate materials, Light divergence, Optical measurement, Test equipment, Liquids, Suspensions (chemical), Counting, Calibration, Verification, Contaminants

Particle size distribution, Particle size measurement, Particulate materials, Light divergence, Optical measurement, Test equipment, Liquids, Suspensions (chemical), Counting, Calibration, Verification, Contaminants

Particle size distribution, Particle size measurement, Particulate materials, Light divergence, Optical measurement, Test equipment, Air, Particulate air pollutants, Air pollution, Counting, Calibration, Verification, Contaminants, Clean rooms

Monitoring particle contamination levels is required in various fields, e.g. the electronics and pharmaceutical industries, and in the manufacturing of precision machines and in medical operations. Particle counters are useful instruments for monitoring particle contamination in the 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 by different instruments.