| 摘要 |
PURPOSE:To reduce the irregularity in the sensitivity of hydrocarbon and to detect a hydrogen flame ion with high accuracy, by contacting a gaseous mixture of sample gas and auxiliary fuel gas with a combustion catalyst member to heat the same and subsequently burning said mixture in a combustion chamber. CONSTITUTION:Sample gas and auxiliary fuel gas are introduced and the resulting gaseous mixture is sent to a gaseous mixture jet nozzle 7 from a passage 4. The jet nozzle 7 is packed with a combustion catalyst member 15 and a heater 16 is provided to the nozzle 17 to heat the gaseous mixture to predetermined temp. while said gaseous mixture is contacted with the catalyst member 15. Next, the gaseous mixture is sent to a combustion chamber 3 from the jet nozzle 7 and burnt. Then, the concn. of gas to be measured, for example, hydrocarbon gas is measured by a measuring collector 8 and a measuring current signal lead-out wire 12. Because the combustion catalyst member is provided, in the measurement of hydrocarbon gas, the irregularity in relative sensitivity due to the kind of hydrocarbon is reduced and the concn. of hydrocarbon can be measured with high accuracy. |
