Abstract: An ambient particulate sampler assembly including an upper section with a nozzle entry and an impactor nozzle housing removably receiving a single nozzle jet. A lower section is removable from the upper section and includes an impaction chamber with one or more outlets. A set of different size nozzle jets are provided and each is insertable in the impactor nozzle housing to allow the user or manufacturer to selectively choose a particular measuring criteria.

Abstract: A photometer device including an inlet passage for receiving a fluid such as an aerosol at a specified flow rate, an outlet passage separated from the inlet passage by a gap, and a radiation passage across the gap. The flow rate and the significant dimension of the inlet passage are set to produce a laminar flow of the aerosol. The gap and the significant dimension of the outlet passage are set to maintain a laminar flow of the aerosol across the gap to prevent contamination of the radiation passage.