White Paper
White Paper: Airborne Particle Monitoring: Impact Of ISO 21501-4 Calibration
By Joe Gecsey, MET ONE/Hach Company
Dependable, consistent and repeatable results in monitoring airborne particles in cleanrooms and clean zones depend both on the sampling technique of the analyst and on the performance of the particle counting instrument. The control of the sampling technique often is the subject of a unique SOP (Standard Operating Procedure) while the performance of the instrument is typically reviewed and verified through an annual or semi-annual calibration process.
The calibration process itself has been subject to a greater degree of variability in actual practice and throughout the lengthy life of the instrument than would be desired, due to different calibration techniques magnified by infrequent maintenance and calibration. This variability can be minimized by the implementation of the ISO 21501-4 calibration standard. Although there will be additional time and cost in the calibration process, the end result will be a noteworthy improvement in repeatability over the lifetime of the instrument and also improvement in reproducibility between instruments.
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