Aerosol Messgeraete

Suspended particles in the air are sampled at 40 ACFM through the circumferential inlet of the size selective inlet. The symmetrical design insures wind-direction insensitifity, and the inlet design and internal configuration makes the collection efficiency independent of the wind speed from 0 to 36 km/h. The particles are then accelerated through multiplecircular impact nozzles.

By virtue their large momentum, particles larger than 10 µm impactor cut-point impact onto the greased impaction surface. The PM-1ß particles smaller than 10 microns are carried vertically upward by the air flow and down multiple vent tubes to the 8"x10" hi-vol. filter, where they are collected.

The large particles settle out in the impaction chamber on the collection shim and are removed/cleaned during prescribed maintenance periods. The quartz fiber high-vol filter is weighed before and after sampling. The weight increase is the mass of particles smaller than 10 µm.