B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
183/107
B01D 46/10 (2006.01) G01N 1/22 (2006.01)
Patent
CA 1036958
FILTER CASSETTE WITH REMOVABLE CAPSULE Abstract of the Disclosure A shallow cup has a central inlet opening in its base and a filter disc closing its open end, whereby a hollow capsule is formed. A barrier member inside the cup is located between its base and the filter and has a central portion spaced from the filter and the cup inlet. This central portion is provided with holes around a solid central area that has a diameter at least as great as the inlet opening. A separable two-part cassette contains the capsule with its marginal area clamped between the two parts. The part containing the cup is provided with a central inlet port in an end wall spaced from the capsule, and the other part of the cassette covers the fil- ter and is provided with an outlet port. Between the capsule and inlet port in the cassette there is a baffle that causes neurespirable particles in the incoming air to be trapped be- fore they can reach the capsule. After a period of filtering, the cassette is opened and the preweighed capsule is removed and weighed again to ascertain the amount of particulate matter captured by the capsule.
243715
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