MEASUREMENT DEVICE FOR WATER VAPOR TRANSMISSION RATE AND MEASUREMENT METHOD FOR WATER VAPOR TRANSMISSION RATE

摘要

Disclosed is a water vapor transmission rate measurement device for measuring water vapor transmission rates with a high degree of accuracy and in a short amount of time. Also disclosed is a measurement method therefor. The water vapor transmission rate measurement device (1) is equipped with a chamber (2), a dry gas introduction pathway (5), a dry gas ejection pathway (6), a water vapor supply unit (17), a control unit (30), and a water vapor amount measurement device (8). The chamber (2) is divided into a first room (13) and a second room (14) by the object to be measured (F). The water vapor supply unit (17) is capable of supplying water vapor to the first room (13). The control unit (30) controls the water vapor supply unit (17) in a manner such that moisture is added to the object to be measured (F) when a first valve (24) and a second valve (29) are open, and water vapor is supplied to the first room (13) when the first valve (24) and the second valve (29) are closed. The water vapor amount measurement device (8) measures the amount of water vapor that is transmitted through the object to be measured (F) towards a measurement space from the first room (13) when the first valve (24) and the second valve (29) are closed.