Abstract: An apparatus for monitoring particulate matter includes a fluid flow passage. Some embodiments include a cartridge defining a part of the fluid flow passage extending from a cartridge inlet to a cartridge outlet and a particle size selector in the fluid-flow passage between the cartridge inlet and the cartridge outlet. The particle size selector comprises a curve section in the fluid flow passage where the flow of fluid undergoes a change in direction and an impact surface extending transversely to the fluid flow passage on an outside of the curve. A particle counter is located downstream from the particle size selector. A pump is connected to drive a flow of a fluid containing the particulate matter through the fluid flow passage. The apparatus may be made compact. Embodiments may be worn and used to monitor exposure of persons to particulate matter.

Abstract: An apparatus for monitoring particulate matter includes a fluid flow passage. Some embodiments include a cartridge defining a part of the fluid flow passage extending from a cartridge inlet to a cartridge outlet and a particle size selector in the fluid-flow passage between the cartridge inlet and the cartridge outlet. The particle size selector comprises a curve section in the fluid flow passage where the flow of fluid undergoes a change in direction and an impact surface extending transversely to the fluid flow passage on an outside of the curve. A particle counter is located downstream from the particle size selector. A pump is connected to drive a flow of a fluid containing the particulate matter through the fluid flow passage. The apparatus may be made compact. Embodiments may be worn and used to monitor exposure of persons to particulate matter.