| 摘要 |
PURPOSE:To take in a sufficient quantity of measuring gas, even if a flow velocity of measuring gas is low, by providing a gas collecting hole on the side wall which faces a gas flow direction of a gas collecting pipe, and providing a gas exhaust hole on a position which orients a horizontal direction against the gas flow direction. CONSTITUTION:A gas collecting hole 2 is penetrated and provided in a position which orients a gas flow direction of the side wall of the tip part of a gas collecting pipe 1. In the inside of the gas collecting pipe 1, a gas leading-in pipe 3 having an almost equal sectional area as an area of the gas collecting hole 2 is provided and its tip part 9 is made to face a gas sensor part 9, and also, its outside periphery and the gas collecting pipe 1 is cut off by a partition wall 4. On the other hand, in a position which orients a horizontal direction against the gas flow direction of the side wall of the gas collecting pipe 1, a gas exhaust hole 10 communicating with an external space of the gas leading-in pipe 3 is penetrated and provided. A measuring gas is taken positively into the inside of the gas collecting pipe 1 by a plus pressure in the vicinity of the gas collecting hole 2 and a minus pressure in the vicinity of the gas exhaust hole 10.
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