US 11,815,432 B2
Thermal conductivity detector and gas chromatograph including same
Yuji Nakama, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/273,442
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Jul. 18, 2019, PCT No. PCT/JP2019/028336
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/059279, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 2018-177177 (JP), filed on Sep. 21, 2018.
Prior Publication US 2021/0341438 A1, Nov. 4, 2021
Int. Cl. G01N 30/66 (2006.01); G01N 30/12 (2006.01); G01N 30/02 (2006.01)
CPC G01N 30/66 (2013.01) [G01N 30/12 (2013.01); G01N 2030/025 (2013.01); G01N 2030/126 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A thermal conductivity detector for a gas chromatograph, comprising:
a heat generator that is driven to maintain a certain temperature and in which a resistive value changes in accordance with thermal conductivity of a gas flowing around the heat generator;
a first flow path that houses the heat generator; and
a second flow path; and
a third flow path that connects the first flow path to the second flow path, wherein
first and third openings to which a carrier gas is led alternately and a second opening to which a sample gas is led are formed at the third flow path,
the first opening, the second opening and the third opening are provided to be arranged in this order from the first flow path toward the second flow path,
a distance between the second and third openings in the third flow path is equal to or smaller than 1.3 times of a maximum dimension of the second opening, and
at least part of a portion between the second opening and the third opening of the third flow path has a cross sectional area equal to or smaller than an area of the second opening.