초록 ▼

A method of and apparatus for testing the integrity of individual filters or filter stages of a multistage filtering system including a diffuser permanently mounted upstream and/or downstream of the filter stage to be tested for generating pressure differentials to create sufficient turbulence for u

A method of and apparatus for testing the integrity of individual filters or filter stages of a multistage filtering system including a diffuser permanently mounted upstream and/or downstream of the filter stage to be tested for generating pressure differentials to create sufficient turbulence for uniformly dispersing trace agent particles within the airstream upstream and downstream of such filter stage. Samples of the particle concentration are taken upstream and downstream of the filter stage for comparison to determine the extent of particle leakage past the filter stage.

대표청구항 ▼

A method of testing the integrity of a filter mounted in a housing in sealing engagement therewith comprising: passing an airstream in a laminar flow path through said housing and filter, introducing trace agent particles into said airstream upstream of said filter, introducing from a separate sourc

A method of testing the integrity of a filter mounted in a housing in sealing engagement therewith comprising: passing an airstream in a laminar flow path through said housing and filter, introducing trace agent particles into said airstream upstream of said filter, introducing from a separate source a restricted high velocity airstream in an axial direction within said first mentioned airstream and along said laminar flow path, diffusing said high velocity airstream outwardly in a diverging path into said laminar flow path to create pressure differentials for agitating and uniformly dispersing said particles within said first mentioned airstream to form a homogeneous air-particle mixture passing through said filter, and sampling the filtered airstream downstream of said filter to determine the extent of particle concentration therein.