US 12,000,807 B2
Gas chromatograph, maintenance switch mode setting method and non-transitory computer readable medium storing maintenance switch mode setting program
Yuki Komori, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/311,935
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Dec. 17, 2018, PCT No. PCT/JP2018/046430
§ 371(c)(1), (2) Date Jun. 8, 2021,
PCT Pub. No. WO2020/129136, PCT Pub. Date Jun. 25, 2020.
Prior Publication US 2022/0026402 A1, Jan. 27, 2022
Int. Cl. G01N 30/06 (2006.01); G01N 30/16 (2006.01); G01N 30/30 (2006.01); G01N 30/02 (2006.01)
CPC G01N 30/30 (2013.01) [G01N 30/06 (2013.01); G01N 30/16 (2013.01); G01N 2030/025 (2013.01); G01N 2030/3084 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A gas chromatograph comprising:
a first sample vaporization unit that vaporizes a sample;
a second sample vaporization unit that vaporizes a sample;
a first separation column that separates a sample supplied from the first sample vaporization unit into respective sample components;
a second separation column that separates a sample supplied from the second sample vaporization unit into respective sample components;
a first carrier gas supplier that supplies a carrier gas, for guiding a sample that is vaporized in the first sample vaporization unit to the first separation column, to the first sample vaporization unit;
a second carrier gas supplier that supplies a carrier gas, for guiding a sample that is vaporized in the second sample vaporization unit to the second separation column, to the second sample vaporization unit;
a column oven that contains the first and second separation columns and has a first heater for heating the first and second separation columns;
a first detector that detects respective sample components obtained by separation in the first separation column;
a second detector that detects respective sample components obtained by separation in the second separation column;
a first auxiliary gas supplier that supplies an auxiliary gas to the first separation column; and
a controller that executes control by increasing a supply pressure of an auxiliary gas applied by the first auxiliary gas supplier to a pressure higher than a pressure during an analysis of a sample supplied from the first sample vaporization unit and lowering a supply pressure of a carrier gas applied by the first carrier gas supplier to a pressure lower than a pressure during the analysis of the sample supplied from the first sample vaporization unit such that the supply pressure of the auxiliary gas is higher than the supply pressure of the carrier gas, and sets a first maintenance switch mode in which the first sample vaporization unit is maintainable with the first heater continuing to heat the first and second separation columns and supplies a sample supplied from the second sample vaporization unit to the second separation column as well as setting the first maintenance switch mode to continue an analysis process.