| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas proportionate sampling apparatus for accurately measuring and extracting a required exhaust sample flow rate with a total exhaust gas flow rate over a wide range of flow rates and diluting it with a clean gas. SOLUTION: The total flow rate of exhaust gases is measured through the use of a laminar flowmeter immediately in the back of an exhaust pipe. An exhaust gas sample flow rate at a specific ratio to this flow rate value at all times is measured and collected in a bag while being controlled by a control valve in the sampling apparatus. The flow rate is controlled through the use of a sample exhaust gas flow of a specific flow rate using CFO or CFV and clean dry air or gaseous nitrogen of a flow rate at a specific ratio to this as a dilution gas and each CFO or CFV, drawn by suction by a dry pump, mixed, and applied with pressure to adjust a diluted exhaust gas sample of specific pressure. Part of it is collected in a bag as a controlled and diluted exhaust gas sample proportional to the total exhaust gas flow rate by a variable cross-sectional-area orifice type flow rate measuring and controlling device. COPYRIGHT: (C)2007,JPO&INPIT
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