Oil-mist concentration measuring apparatus

PURPOSE: To obtain an oil-mist concentration measuring apparatus, which can measure the concentration of oil mist in gas, whose oil-mist concentration is to be measured, simply and accurately and can be manufactured at a relatively low cost. CONSTITUTION: An oil-mist concentration measuring apparatus is provided with an ultraviolet-ray lamp 1, which emits ultraviolet rays, a visible-light lamp 2 which emits visible light, a measuring cell 3 which contains object gas whose oil-mist concentration is to be measured and transmits the rays from the lamps 1 and 2, and a comparing cell 4 which contains clean comparing gas and can transmits the rays from the lamps 1 and 2. Furthermore, the following parts are provided. Photodetector elements 51 and 52 and a differential amplifier 71 determine the difference between the intensity of the rays from the lamp 1 through the measuring cell 3 and the intensity of the rays from the lamp 1 through the comparing cell 4. Photodetectors 61 and 62 and a differential amplifier 72 determine the difference between the rays from the lamp 2 through the measuring cell 3 and the intensity of the rays from the lamp 2 through the comparing cell 4. An operating device 8 corrects the former difference with the latter difference and determines the concentration of the oil mist. COPYRIGHT: (C)1993,JPO&Japio