As the gas dilution system for the exhaust air gas determination of part dilution mode and the gas dilution system null part for particulate condition material measurement in exhaust air gas

摘要

PROBLEM TO BE SOLVED: To provide a gas diluted gas diluting system for measuring exhaust gases, capable of partially diluting collected exhaust gases with a gas for dilution, such as air and highly accurately controlling the gas for dilution, while the flow quantity is relatively large, with a high-speed response.;SOLUTION: In a gas supply channel 5 for dilution, a first channel 33 for making the gas for dilution flow at a prescribed quantity of flow is provided in parallel with a second channel 34, provided with a piezoelectric valve 43 for controlling the quantity of flow of the gas for dilution. Differential pressure flow meter 60 included in the gas supply channel 5 for dilution is provided for a third channel 36, provided on the downstream side from the merging point 35 of the fist channel 33 and the second channel 34, and the opening of the piezoelectric valve 43 is controlled, on the basis of the actual quantity of flow of the gas for dilution detected by the differential pressure flow meter 60, included in the gas supply channel 5 for dilution.;COPYRIGHT: (C)2004,JPO&NCIPI