| 摘要 |
PURPOSE:To make it possible to perform long-time stable measurement under a severe condition, by forming the upper part in an aeration tank as a gaseous mixture collecting part for collecting a gaseous mixture of carrier gas and gas dissolved in measuring water, and successively arranging an oxygen adder, an oxygen remover and an oxygen concn. measuring instrument. CONSTITUTION:The upper part in an aeration tank 1 is formed into a gaseous mixture collecting part 5 for collecting a gaseous mixture of carrier gas and gas dissolved in measuring water and the gaseous mixture collecting part 5 is connected to a moisture remover 7 through a gas exhaust port 6 while the outlet of the moisture remover 7 is connected to an analytical apparatus 8. This analytical apparatus 8 has an X-course wherein a first oxygen adder 10 and an oxygen concn. measuring instrument 11 are successively arranged to the pipeline 9 connected to the moisture remover 7 in series and a Y-course wherein an oxygen remover 13, an oxygen adder 14 and an oxygen concn. measurng instrument 15 are arranged to the pipeline 12 branched from the moisture remover 7 apart from the pipeline 9. Extracted gas, from which moisture is removed in the moisture remover 7, is flowed through the X-course and the Y-course as divided streams. |
