| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemiluminescence type nitrogen oxide concentration meter capable of preventing dew condensation of water in sample gas on a glass window surface interposed between a reaction vessel and a detecting part. SOLUTION: A semiconductor photoelectric converting element 41 for converting the intensity of chemiluminescence light to an electric signal is mounted through a metallic cooling bed 43 on the cooling side of an electronic cooling element 42 utilizing a Peltier effect, the radiation side of the electronic cooling element 42 is closely fixed onto a metallic detector base 44 of the electronic cooling element 42, and the reaction vessel 3 where sample gas and O3 are inserted is integrally connected to the upper part of a detector cap 45 including the glass window W connected to the detector base 44. The glass window W is formed by a double-glass window where two glass sheets W1, W2 are arranged in parallel through a spacer S.
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