Patent ID: 8668377

Claim:
A gas diluter, for mixing a first gas to be diluted with a second gas diluting the first gas, comprising: a plurality of passages receiving introduction of the first gas and different from each other in terms of passing time of the first gas after being introduced; and a mixing portion mixing the first gas passing through said plurality of passages with the second gas; wherein said plurality of passages includes: a plurality of dilution chambers decreasing a concentration of the first gas by mixing the first gas with the second gas; connection passages directly connecting said plurality of dilution chambers in series; and a branch passage introducing the first gas in distribution into said plurality of dilution chambers, and wherein said mixing portion includes: an introduction passage introducing the second gas into one dilution chamber positioned at one end portion of said plurality of dilution chambers connected in series; and a discharge port through which to discharge a mixture gas of the first gas and the second gas from other dilution chamber positioned at the other end portion of said plurality of dilution chambers connected in series, wherein an aperture of the introducing passage is spaced at a predetermined distance from an aperture of one of the connection passages in the dilution chamber positioned at the one end portion, and an aperture of a passage for exhaustion having the discharge port is spaced at a predetermined distance from an aperture of one of the connection passages in the dilution chamber positioned at the other end portion, and apertures of the connection passages are spaced at a predetermined distance from each other in the other dilution chambers.