| 摘要 |
PURPOSE:To enable analysis while eliminating the effect of the flow rate change of a measuring gas with an analyzer for measuring gas concn. from the difference in the heat conductivity of the measuring gas by heating the measuring gas by a heat ray element and introducing the gas by natural convection into a measuring chamber. CONSTITUTION:A measuring side cell wall pipe 4 is provided into a cell block 11 of a measuring instrument and a reference side cell wall pipe is provided to face said pipe. A heat ray element 6a is inserted into the pipe 4. A heat ray element is similarly inserted into the reference side cell wall pipe as well. A partition member 10 having a small hole is provided to the lower part of the pipe 4. The measuring gas G lows in a measuring gas flow passage 19 during this time. The measuring gas G flows through the small hole of the member 10 into the pipe 4 and is heated by the element 6a so as to be ascended by the natural convection. The gas turns over downward at the top end of the pipe 4 and returns to the flow passage 19. The gas concn. is analyzed from the difference in the heat conductivity between the measuring side cell wall pipe and the reference side cell wall pipe. Since the measuring gas is introduced into the measuring chamber by the natural convection, the replacement is speeded up and the analysis with high accuracy is executed.
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