Sizing of particles

Several different ways can be defined to measure a particle. According the ISO 14644-3 the manufacturer is allowed to define his own system of measuring. The PDM system uses a method of measuring widely used in machine vision. Airborne particle counters have a way of measuring the size equivalent to the polystyrene latex sphere (PSL) particle. Airborne particle counters use this method as the PSL’s are used as well in their calibration method and because it fits better the sensor type used. See full article.

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