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ISO 21501-4: Light Scattering Airborne Particle Counter for Clean Spaces
ISO 21501-4 covers instrument calibration procedures to ensure air particle counter sampling measurement inaccuracies are reduced. A Counting Efficiency Test is also included as a final confirmation of air particle counting performance.
All GMP cleanroom operators/users must ensure the air particle counters used to classify and monitor their cleanrooms are compliant with ISO 21501-4 requirements.
ISO 21501-4 Parameters
Counting efficiency at first channel
50% ± 20%
Counting efficiency at particle size 1.5-2.0 times first channel