| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a dew from being condensed on an inner wall of a test tank while a gas concentration is stabilized by a method wherein a dehumidifier and a circulation pump are arranged from a circulation opening side in a circulation circuit between the circulation opening of a tester and its return opening, and only moisture in a gas atmosphere in the test tank is released to the open air by an ion exchange membrane of the dehumidifier to make a dry gas by dehumidification. SOLUTION: A test gas is adjusted in concentration by dilution and mixing, and introduced into a test tank. A circulation circuit is provided between a circulation opening 16 of the test tank of a gas corrosion tester 2 to be adjusted to the gas concentration atmosphere and its return opening 17, and a dehumidifier 1 and a circulation pump 18 are arranged successively from the circulation opening 16 side. Only the moisture in an exhaust gas is released to the open air through an ion exchange membrane 4 to be dehumidified while it is passed from a gas inlet to an outlet on a side surface of a frame wherein the ion exchange membrane 4 is spread on both sides in the dehumidifier 1, and the product is returned as a dry gas into the gas atmosphere. Control of the circulation pump 18 is executed by a temperature and humidity control mechanism 13. Thereby, a change in a gas concentration to be caused by dissolution of the gas into dew condensed water and dew condensation on an inner wall of the test tank can be prevented.</p> |
