초록 ▼

A volume flow control device for an aerosol sampler is disclosed. The device includes a mechanism for drawing the aerosol through the sampler. A critical flow venturi is disposed downstream in the sampler for maintaining a predetermined volume flow of aerosol through the sampler. The aerosol drawing

A volume flow control device for an aerosol sampler is disclosed. The device includes a mechanism for drawing the aerosol through the sampler. A critical flow venturi is disposed downstream in the sampler for maintaining a predetermined volume flow of aerosol through the sampler. The aerosol drawing mechanism is adapted to create a vacuum downstream of the venturi.

대표청구항 ▼

Flow controller apparatus for an ambient aerosol sampler, comprising: critical flow venturi means connected to said sampler for limiting the volumetric flow of air through said sampler at a predetermined rate, said venturi means having a rectangular entrance, a converging section that extends from s

Flow controller apparatus for an ambient aerosol sampler, comprising: critical flow venturi means connected to said sampler for limiting the volumetric flow of air through said sampler at a predetermined rate, said venturi means having a rectangular entrance, a converging section that extends from said rectangular entrance axially downwardly and inwardly to a throat section of circular cross-section sized to cause a choked flow condition at said predetermined volumetric flow rate, said converging section being gradually and smoothly transformed from a substantially rectangular cross-section at the entrance to a substantially circular cross-section adjacent the throat.