| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for evaluating an ester oil that enable data consistent with an oil life of an actual machine to be easily obtained for hydrolytic stability of oils having different saturated moisture concentration.SOLUTION: The apparatus for evaluating an ester oil comprises: a hermetic container 12 that hermetically holds a predetermined amount of an ester oil 11; a heating device 13 that heats the ester oil 11 in the closed container 12 to hydrolyze the ester oil 11; a minute amount moisture analyzing device 14 that measures a minute amount moisture content in the closed container 12; a minute amount moisture addition device 16 that adds a minute amount of moisture 15 into the closed container 12; and a moisture concentration control device 17 that keeps the moisture content of the ester oil 11 in the closed container 12 at a predetermined concentration in accordance with a measurement result of the minute amount moisture analyzing device 14. |
