| 摘要 |
A technology for measuring an air permeability which can avoid, by using pur e water in place of oil as a sealing liquid, adverse effects by oil mist and c an accurately measure an air permeability by identifying variations in vapor concentration to be caused by using water. A device for measuring an air permeability installed in a constant temperature/humidity room, wherein an a ir chamber (22) is formed inside an inner tube (2) with the inner tube fitted i n an outer tube (1) storing a sealing liquid, a sample clamping unit (5) is provided between an air passage (3) extending from the air chamber through t he bottom of the outer tube and an exhaust passage (42) facing the air passage, pure water (W) is used as the sealing liquid, and a temperature/humidity measuring unit (6) and an air supply port (7) opened/closed by a solenoid valve (71) are provided in the vicinity of the sample clamping unit in the a ir passage.
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