| 摘要 |
<p>PURPOSE:To enable correct measurement of a flow rate to be conducted without requiring a separate flow rate measuring device by providing cells which are subjected to the same carrier gas and at a flow rate of zero in a cell block and providing a hot wire filament here. CONSTITUTION:A reference cell A and a measuring cell B as well as a third cell C are provided in a cell block 1 inside an oven 14, while filaments FA to FC with constant current supplied from a constant current power source 15 are provided in respective cells. Carrier gas flows through the cell A, a sample vaporizing chamber 12, a column 13 and the cell B to a vent by a flow controller 11. Change in electric resistance of the filaments FA, FB according to change in gas concentration records concentration on a gas concentration recorder 18. At the same time difference in electric resistance of the filament FC and the filament FA of the cell C which are connected to a purge flow path 9 wherein it is communicated with the cell A and a valve is closed during operation and whose flow rate is zero when sealed is detected and the flow rate is displayed on a flow rate display 19. Thus a detector which does not require a separate flow meter and which is electric and highly accurate can be obtained.</p> |
