| 摘要 |
<p>PURPOSE:To detect oil leakage with high sensitivity, by adding rhodamine B beforehand in a water-soluble working fluid, irradiating excitation light to the liquid to be monitored such as waste water contg. the oil leaking from a hydraulic cylinder and measuring the intensity of fluorescence by the rhodamine B. CONSTITUTION:Rhodamine B is added up to about 1,000ppm to a water-soluble working fluid (consisting essentially of glycolic compds.) to be used for hydraulic cylinders of hot rolling mills, etc. For example, when the working fluid leaks and is mixed together with the cooling water for rolling rolls into a waste water system, the sample water which is passed through a filter 12 and is thus removed of foreign matter is flowed through a fluorescence measuring cell 13. The light of an Xe lamp 14 is divided to excitation light of 500-550nm by a spectroscope 15 for excitation and is then irradiated to the cell 13. Only the light of 550-600nm is removed with a spectroscope 16 for emission of light, and the intensity of fluorescence is measured with a detector 17. The electric signal thereof is converted to a concn. with a data processing device 18, and the concn. of the rhodamine is displayed on a display 19. The oil leakage is thus detected quickly and continuously.</p> |
