| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which the deterioration of lubricating oil, such as the engine oil, turbine oil, refrigerating machine oil, etc., can be detected with high accuracy and a refrigerating system for which whether or not the fault of the system is caused by low-pressure gas leakage can be discriminated. SOLUTION: In the method, the deterioration of lubricating oil is detected with high accuracy by using the characteristic ultraviolet-absorbing peak of a resulted product of deterioration contained in the lubricating oil. Since a low-pressure gas leakage detecting means 6 using the method is provided in the refrigerating system composed of a compressor 1, a condenser 2, an expanding mechanism 3, and an evaporator 4 to detect the quantity of a product of oxidative deterioration of the lubricating oil dissolved in the oil, the presence/ absence of mixed air in the refrigerating system caused by the gas leakage from a low pressure-side pipeline can be confirmed and whether or not a fault is caused by low-pressure gas leakage can be discriminated.
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