In the ozone sensor and its ozone sensor the ozone concentration method of detection

摘要

PURPOSE:To prevent drying of an ozone sensitive material and to perform stabilized measurement by bringing a reactive test band impregnated with the ozone sensitive material into contact with ozone in a window for measurement while transferring the reactive test band and measuring the concn. of ozone from both the change in color of the ozone sensitive material and the transferring velocity. CONSTITUTION:While a rolled reactive test band 58 impregnated with 5-nitro-ferroin is transferred by the rollers 56, 57, it is brought into contact with the gas to be measured in an ozone sensitive window 55 and discolored in accordance with the concn. of ozone. The light emitted from a light source 1 is transmitted through the discolored test band 58. The absorption amount of light is detected by a photodetector 4 and the concn. of ozone is detected as the difference of detected resistance value. The transferring velocity of the test band 58 is controlled by a monitor 7 with a transistor 84 according to the change in color thereof. Therefore the change in color correspondent to the concn. is obtained and also the face of a fresh test band is always shown in the window 55. Thereby evaporation of a solvent in the test band is inhibited and malfunction is prevented and the stabilized measurement always is performed.