Abstract
Aerosol counting Characteristics of two types of coutinuous flow condensation nucleus counters (CNCs) were investigated. Three CNCs of each type (TSI, Model 3020 and 8010) were tested by using monodisperse NaCl aerosols ranging from 0.005 to 0.2 μm in diameter. Dependencies of indicated concentration on particle size and number concentration were investigated by inter-comparison with CNCs.
When aerosol number concentration is less than 103 particles/ml, no significant difference in indicated concentration was observed among six CNCs. However, systematic differencies between the CNC types were observed over 103 particles/ml, where operational mode of the model 3020 changes from single counting mode to photometric mode. After compensation of the systematic differencies, no significant concentration dependency was observed. It was also observed that the model 3020 detected smaller particles than the model 8010. The detectable size was slightly different even for the same type of CNC. differencies.
