ISO 27891:2015

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ISO 27891:2015 is an international standard that provides methods for calibrating condensation particle counters (CPCs). It specifies how to determine the detection efficiency of CPCs for different particle number concentrations and sizes, including the associated measurement uncertainty. The standard covers particle sizes from approximately 5 nm to 1000 nm and inlet flows between 0.1 l/min and 5 l/min.