| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas concentration measuring apparatus capable of purging an analysis part etc. when measurement is halted. SOLUTION: When the measurement is halted, a valve 10 is switched to the side of a calibration gas to halt the introduction of a sample gas from a sample gas inlet 6. Then a zero gas is made to flow for three minutes to discharge the sample gas remaining in the analysis part 2 and a sample pump 12 with the zero gas from an outlet 18 and purge the sample pump 12, the analysis part 2, piping, etc. COPYRIGHT: (C)2005,JPO&NCIPI
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