Precision Matters: ISO 21501-4 Calibration of Particle Counters

Reliable particle measurement is the foundation of cleanroom monitoring and contamination control. ISO 21501-4 provides a globally recognized framework for the calibration of airborne particle counters, ensuring that measurements are accurate, reproducible, and comparable across different instruments and laboratories. This session will outline the key requirements of ISO 21501-4, including the definition of particle size accuracy, counting efficiency, resolution, false count rate, and flow rate verification. By standardizing these parameters, ISO 21501-4 establishes a basis for data integrity and regulatory compliance, helping organizations to minimize risk and safeguard product quality. Participants will gain a clear understanding of how adherence to ISO 21501-4 enhances confidence in monitoring results and supports consistent decision-making in critical cleanroom environments.