Determining concentration of differently sized particle-dust aggregates in aerosol

摘要

The concentration determination method involves a device which has a sensor/collector module (16) has an influx head (1) opening directly into a separation nozzle (2) of the first stage (22) of a virtual impactor, divided from its second stage (23) by a partition (41). A minor portion of the influx enters a reception nozzle (3) while the major portion (Q1) passes through a first filter (7) removing particles of diameter less than 4 microns. Intermediate and final filters (8,9) extract fractions with particle sizes 4-10 and more than 10 microns respectively. The computer (18) and pump (19) are housed in a separate module (17).