US 11,808,744 B2
Liquid sample injection mechanism for an instrument for elemental analysis
Takeshi Iharada, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/608,690
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Aug. 4, 2020, PCT No. PCT/JP2020/029783
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2021/039305, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-156869 (JP), filed on Aug. 29, 2019.
Prior Publication US 2022/0214320 A1, Jul. 7, 2022
Int. Cl. G01N 31/12 (2006.01); G01N 31/10 (2006.01)
CPC G01N 31/12 (2013.01) [G01N 31/10 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An instrument for elemental analysis comprising:
a combustion tube that has a sample injection port with an open top and is for combusting a liquid sample therein;
a sample injection mechanism having a nozzle and a slider, the nozzle being for injecting a sample into the combustion tube, the slider being configured to slide between a first position and a second position above the combustion tube, the sample injection mechanism being configured so that the sample injection port of the combustion tube is sealed in a state where the slider is positioned at the first position, and the sample injection port is unsealed and the nozzle is positioned above the sample injection port in a state where the slider is positioned at the second position;
a carrier gas supply flow path communicating with inside of the combustion tube to supply carrier gas into the combustion tube;
a pressure sensor that detects pressure in the carrier gas supply flow path;
a detector for detecting components in sample gas flowing out of the combustion tube; and
an arithmetic part configured to determine an abnormality degree of a state in a system between the combustion tube and the detector based on a change in pressure, which is detected by the pressure sensor, at the time when the slider of the sample injection mechanism slides from the first position to the second position.