| 摘要 |
PROBLEM TO BE SOLVED: To obtain a measuring apparatus by which the dust holding amount of a dust filter (a bag filter) can be measured automatically by a method wherein a time-dependent change in a fiter differential pressure generated between an air-to-be- filtered storage chamber and a clean air chamber is recorded, an air suction operation is stopped when the filter differential pressure becomes a prescribed value and the compressed air is spouted from a nozzle. SOLUTION: A filter body part 1 is constituted of a test-piece mounting part 3, of a clean air chamber 4, of an air-to-be-filtered storage chamber 5 and of a floating- dust generation device. First, a test piece at a dust filter 47 is set on the test-piece mounting part 3, the floating-dust generation device is operated, and the filtering operation of the air in the air-to-be-filtered storage chamber 5 is started at a constant filtration speed. Simultaneously with the start of the filtering operation, a filter differential pressureΔP due to the filter 47 is generated, and it is always measured and recorded by a differential pressure (ΔP) measuring and recording device. Then, when the differential pressureΔP which is increased due to an increase in a dust accumulation amount reaches a preset value, an air suction operation by an isokinetic sampling device is stopped, and dust particles which are stuck to the test piece are blown off by the compressed air.
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