ISO 21501-4 (Cleanrooms and associated controlled environments — Part 1: Classification of air cleanliness by particle concentration) requires airborne particle counter calibrations to be completed following ISO 21501-4. The table below defines the parameters of ISO 21501-4.
By calibrating particle counters following ISO 21501-4 the end result is a higher accuracy calibration. If the particle counter is passing an ISO 21501 calibration you can be assured that the sensor is operating correctly and the particle count data is accurate.
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