US 9,435,774 B2Granted

Gas chromatograph apparatus

AssigneeShimadzu Corporation

InventorShuichi Kawana

Life of this patent

Estimating the term…

Loading patent…

Abstract

A gas chromatograph having a column which separates respective components contained in a gas sample introduced via a carrier gas over time, wherein an analysis mode and a standby mode can be switched and executed. The gas chromatograph apparatus comprises: a carrier gas flow path, a column protection gas flow path, a flow path switching part provided between the carrier gas flow path and the column protection gas flow path and a column so that only one of the carrier gas or a column protection gas is introduced into the column, and a flow path control part for controlling the flow switching part so as to introduce the carrier gas into the column at the time of the analysis mode and introduce the column protection gas into the column at the time of the standby mode.

Claims6

Dependent claims

A gas chromatograph apparatus having a column which separates respective components contained in a gas sample introduced via a carrier gas over time, wherein an analysis mode in which an analysis of said gas sample is executed and a standby mode in which an analysis is not executed can be switched and executed, said gas chromatograph apparatus comprising:

a) a carrier gas flow path for introducing said carrier gas into said column;
b) a column protection gas flow path for introducing a column protection gas separate from said carrier gas into said column;
c) a flow path switching part provided between said carrier gas flow path and said column protection gas flow path and said column so that only one of said carrier gas or said column protection gas is introduced into the column;
d) a flow path control part for introducing said carrier gas into said column at the time of said analysis mode and introducing said column protection gas into said column at the time of said standby mode;
e) a flow controller having at least one control mode from among a constant linear velocity mode, a constant flow volume mode, and a constant pressure mode as a mode for controlling a flow state of a gas introduced into said column;
f) a determination part for estimating at least one value of a linear velocity, a flow volume of the column protection gas, and a pressure of the column protection gas when the gas introduced into said column is changed from said carrier gas to said column protection gas without changing the control mode of said flow controller and parameters related to said mode at the time of a transition from said analysis mode to said standby mode and determining whether the estimated value is within a preset range;
and
g) a change indication part for prompting a user to change the control mode of said flow controller and/or the parameters related to said mode by means of a predetermined method if said determination part determines that said estimated value is not within said range.

5 more elements

A method for protecting a column in a gas chromatograph which separates respective components contained in a gas sample introduced via a carrier gas over time, wherein an analysis mode in which an analysis of said gas sample is executed and a standby mode in which an analysis is not executed can be switched and executed, said gas chromatograph comprising a flow controller having at least one control mode from among a constant linear velocity mode, a constant flow volume mode, and a constant pressure mode as a mode for controlling a flow state of a gas introduced into said column, the method comprising:

receiving an instruction from a user regarding a selected mode;
introducing said carrier gas in a carrier gas flow path in response to said analysis mode being selected by the user;
and
introducing a column protection gas separate from said carrier gas in response to said standby mode being selected by the user;
switching between only said carrier gas and only said column protection gas in response to the instruction of the user so that only one of said carrier gas or said column protection gas is introduced into the column by a flow path switching part provided between said carrier gas flow path and said column protection gas flow path and said column;
estimating at least one value of a linear velocity, a flow volume of the column protection gas, and a pressure of the column protection gas when the gas introduced into said column is changed from said carrier gas to said column protection gas without changing the control mode of said flow controller and parameters related to said mode at the time of a transition from said analysis mode to said standby mode and determining whether the estimated value is within a preset range;
and
prompting the user to change the control mode of said flow controller and/or the parameters related to said mode by means of a predetermined method if it is determined that said estimated value is not within said range.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/905,652Filed 30 May 2013
Published: US 2014/0352406 A14 Dec 2014
Granted: 6 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 30/38
Conditioning of the fluid carrier; Flow patterns: flow patterns
G01N 2030/324
Of pressure or speed: speed, flow rate
G01N 2030/385
Flow switching in a single column: by switching valves
G01N
Investigating or analysing materials by determining their chemical or physical properties

Family

US 2014/0352406 A1Pre-grant publication · published 4 Dec 2014
US 9,435,774 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key