Title:
FILTER INSTRUMENT
Document Type and Number:
Japanese Patent JPS51111969
Kind Code:
A
Abstract:
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 filter and is provided with an outlet port. Between the capsule and inlet port in the cassette there is a baffle that causes nonrespirable particles in the incoming air to be trapped before 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.
More Like This:
Inventors:
SUTANREI PII NEBATSUSHIYU
Application Number:
JP890276A
Publication Date:
October 02, 1976
Filing Date:
January 31, 1976
Export Citation:
Assignee:
MINE SAFETY APPLIANCES CO
International Classes:
B01D27/08; G01N1/02; G01N1/22; (IPC1-7): B01D46/00; G01N5/00