| 摘要 |
PURPOSE:To execute a quantitative analysis of various hydrocarbons in a sample as well as all the hydrocarbons by one detecting apparatus, by providing a plurality of detection electrodes. CONSTITUTION:A component to be measured in a sample charged in a hydrogen flame 6 is burnt and ionized and a minute current being proportional to concentration is made to flow by electric fields between the opposite electrodes 11 and 12, and 11 and 28. This minute current is detected as a voltage value through amplifying elements 13 and 29 and outputted to a differential amplifier 31 directly and through a photocoder 14 respectively. An ionization energy of hydrocarbon is lower as a molecule thereof turns higher, in general, and the ionization of methane, for instance, proceeds in a high-temperature part of the hydrogen flame. Therefore, hydrocarbons other than the methane are detected by the detecting electrode 28 being smaller in length than the detecting electrode 12. Accordingly, all the hydrocarbons are detected from the amplifying element 13, while the hydrocarbons other than the methane are detected from the amplifying element 29. |
