초록 ▼

A filter testing apparatus and method are provided wherein a challenge aerosol or the like is introduced upstream of the filter, and the downstream face of the filter is scanned with an air sampling probe to detect for the presence of leaking aerosol. The apparatus comprises a generally rectangular

A filter testing apparatus and method are provided wherein a challenge aerosol or the like is introduced upstream of the filter, and the downstream face of the filter is scanned with an air sampling probe to detect for the presence of leaking aerosol. The apparatus comprises a generally rectangular frame, and an air sampling probe which is mounted to the frame so as to be movable in a predetermined pattern wherein the entire face of an adjacent filter is scanned. The assembly may be removably mounted in a filter housing immediately downstream of the filter, or mounted on a framework downstream of a bank of several filters. In the latter instance, the assembly is sequentially indexed to a position alignment with each filter, and an upstream aerosol dispersion assembly is also provided which is correspondingly indexed across the filter bank. The rate of leaking challenge aerosol is continuously plotted on a moving sheet of paper to thereby permit the magnitude of a leak and its location on the face of the filter to be readily determined.

대표청구항 ▼

An apparatus adapted for detecting minute leaks of unfiltered air through an air filter, and which is characterized by the ability to scan the full area of the face of an adjacent filter and so as to permit the collection and sampling of air passing through a relatively small portion of the total ar

An apparatus adapted for detecting minute leaks of unfiltered air through an air filter, and which is characterized by the ability to scan the full area of the face of an adjacent filter and so as to permit the collection and sampling of air passing through a relatively small portion of the total area of the face of the filter at any given movement, and comprising a generally rectangular frame which is sized to generally conform to the outline of a filter to be tested, and which defines a lateral direction extending between one pair of opposite sides, a transverse direction extending between the other pair of opposite sides, and a longitudinal direction extending through the frame and perpendicular to the lateral and transverse directions, an air sampling probe having an air receiving open end, with the area of the open end being substantially less than the area defined within said frame, means mounting said probe to said frame with said probe open end facing in the longitudinal direction and so as to be adapted to open toward the face of an adjacent filter, and including drive means for sequentially traversing the probe in each lateral direction across the frame, and indexing the probe in the transverse direction a distance not greater than the transverse dimension of said open end of said probe and so that the entire face of an adjacent filter may be scanned by the probe, and means for conveying air received in the open end of said probe to a remote location for continuous analysis or the like.