Shimadzu Corporation

Yuji Nakama

Shigeaki Shibamoto

Minoru Kashihara

Kazunori Takahashi

Kasumi Sasaki

A sample vaporization chamber for gas chromatograph includes a cylindrical insert provided, at least on a lower end side of an inner peripheral surface or an outer peripheral surface thereof, with a first threaded portion, and an insert fixing portion provided with a second threaded portion to be threaded with the first threaded portion in the inner space of the housing. The insert fixing portion is configured to fix the insert in the inner space of the housing in a state in which the insert is accommodated in the inner space by threading the first threaded portion of the insert inserted in the inner space through the opening with the second threaded portion.

Sample vaporization chamber and gas chromatograph comprising said sample vaporization chamber

A gas chromatograph includes a sample introduction unit configured to introduce a vaporized sample into a separation column together with a carrier gas, a detection unit configured to detect a gas emitted from the separation column, and a catalyst processing unit. The catalyst processing unit includes a catalyst configured to introduce a gas containing the carrier gas discharged from the sample introduction unit or the detection unit to oxidize the hydrogen gas.

Gas chromatograph

A thermal conductivity detector () includes: a cell block () provided therein with a measurement cell () serving as a space in which a filament () for exchanging heat with a gas is arranged, the cell block () being provided with a cell inlet () for introducing a gas into the measurement cell () and a cell outlet () for flowing out the gas from the measurement cell (); an outlet flow path () communicated with the cell outlet () of the cell block (); a buffer block () provided therein with a buffer space (), the buffer block () having an inlet port () for introducing the gas into the buffer space () and a discharge port () for discharging the gas from the buffer space (), the inlet port () being fluidly connected to the outlet flow path (); and a discharge member () retaining a fluid resistance portion () for increasing fluid resistance of the discharge port (), the discharge member () being attached to the buffer block () such that the gas discharged from the discharge port () passes through the fluid resistance portion (), the discharge member () being configured to be detachable from the buffer block () together with the fluid resistance portion ().

Thermal conductivity detector

A thermal conductivity detector includes: a first flow path () in which a filament () is arranged; a second flow path () provided separately from the first flow path (); an introduction flow path () configured to fluidly communicate between an upstream of the first flow path () and an upstream end of the second flow path (); a sample inlet () configured to introduce a sample gas to the introduction flow path (); a first gas inlet () provided between the sample inlet () in the introduction flow path () and an upstream end of the first flow path (); a second gas inlet () provided between the sample inlet () in the introduction flow path () and an upstream end of the second flow path (); a carrier gas supply source (); a selector () configured to selectively introduce the carrier gas from the carrier gas supply source () to one of the first gas inlet () and the second gas inlet (); and a detection circuit () configured to detect a component in a sample gas via the filament (), wherein when the carrier gas from the carrier gas supply source () is guided to the first gas inlet (), a reference phase in which only the carrier gas flows through the first flow path () is formed, when the carrier gas from the carrier gas supply source () is guided to the second gas inlet (), a sampling phase in which the sample gas flows through the first flow path () is formed, and wherein fluid resistance of the first flow path () and flow resistance of the second flow path () are designed such that a ratio of a difference between a reference flow rate and a sampling flow rate to each of the reference flow rate and the sampling flow rate becomes 15% or less, the reference flow rate being a flow rate of a gas flowing through the first flow path () in the reference phase, the sampling flow rate being a flow rate of gases flowing through the first flow path () in the sampling phase.

Provided is a gas chromatograph capable of efficiency circulating air in a column oven. The gas chromatograph is provided with a column oven, a heater, a fan, and a cylindrical member. The column oven accommodates a column. The heater heats the inside of the column oven. The fan has a blade that rotates about a rotation axis in the column oven, and sends air toward the column provided in the axial direction that is a direction along the rotation axis. The cylindrical member is arranged to accommodate at least a part of the fan in a state of being spaced apart from the column in the axial direction and surrounding an outer periphery of the fan along a rotational direction of the blade.

A thermal conductivity detector includes a first pipe path that houses a filament, a second pipe path and a third pipe path that connects the first pipe path to the second pipe path. In the third pipe path, first, second and third gas lead-in portions are arranged in this order from the first pipe path toward the second pipe path. A carrier gas is led to the first and third gas lead-in portions alternately, and a sample gas is led to the second gas lead-in portion. The distance between the second and third gas lead-in portions is equal to or smaller than 1.3 times of a maximum dimension of an opening formed at the second gas lead-in portion. At least part of the third pipe path between the second gas lead-in portion and the third gas lead-in portion has a cross sectional area that is equal to or smaller than an area of the opening formed at the second gas lead-in portion.

Thermal conductivity detector and gas chromatograph including same

An upstream portion of a flow path is stored in a cell block. A filament for detecting thermal conductivity of a sample gas is stored in the upstream portion. The sample gas is led to a downstream portion of an exhaust pipe path through the flow path. The flow path is kept warm by a temperature retainer such that the temperature of the sample gas that passes through the exhaust pipe path does not decrease to a temperature equal to or lower than a liquefaction temperature of the sample gas. Alternatively, at least one portion including a downstream end of the exhaust pipe path is provided to be attachable to and detachable from another portion of the flow path.

A thermal conductivity detector includes a first pipe passage and an exhaust pipe passage. The first pipe passage is accommodated in a cell block together with a heating device. The exhaust pipe passage has an outlet port at the downstream end, and most of the exhaust pipe passage including the downstream end is drawn out of the cell block. The heating device maintains the space in the cell block at a temperature capable of vaporizing the sample. A filament is accommodated in the first pipe passage. The gas passing through the first pipe passage is discharged out of the thermal conductivity detector through the exhaust pipe passage outlet port. On the inner surface of the exhaust pipe passage, a coating having resistance to a cleaning fluid for removing the adhered substance due to the sample gas is formed.

Thermal conductivity detector and gas chromatograph equipped with the same

Provided is a thermal conductivity detector including a detection channel through which a gas to be measured flows as a fluid, a heat conducting part that includes at least a filament provided at a position in the detection channel at which the filament is in direct contact with the fluid flowing through the detection channel, the filament being folded at least once in a direction substantially parallel to a flow direction of the fluid flowing through the detection channel, and that conducts heat via the fluid flowing through the detection channel, and a detection circuit that detects an electric signal in accordance with a change in current or voltage of the filament. The filament is folded by being holed on a folding pin provided substantially perpendicular to the flow direction in the detection channel, and the folding pin has a position shift prevention structure for preventing a fold of the filament hooked on the folding pin from shifting in a longitudinal direction of the folding pin.

Provided is a gas chromatograph including a column which separates a sample; a detector which is configured to alternately introduce a carrier gas containing a sample component separated by the column and a carrier gas alone into a detection unit by changing an inflow point of the carrier gas to acquire a signal; an analysis information input unit with which analysis information is input; a data retaining unit which retains data indicating a relationship between a column flow rate and a carrier gas flow rate which is obtained in advance; and calculation unit which is configured to calculate the carrier gas flow rate on the basis of the analysis information input from the analysis information input unit and calculate the carrier gas flow rate according to the calculated column flow rate by using the calculated column flow rate and the data retained in the data retaining unit.

A thermal conductivity detector that causes a fluid to come into contact with the surface of a heated temperature sensing element, that causes the temperature of the temperature sensing element to change according to the thermal conductivity of the fluid, and that detects the fluid based on a change in the electrical resistance of the temperature sensing element at that time or on a change in the value of a current to be applied to the temperature sensing element is provided. The thermal conductivity detector includes a cell space where the temperature sensing element is accommodated and to which a fluid is introduced and from which the fluid is discharged, a buffer space that is connected to a fluid outlet of the cell space, and a discharge channel that is connected to a fluid outlet of the buffer space.

Thermal conductivity detector and gas chromatograph

Detection sensitivity of a single-filament thermal conductivity detector is to be increased. A thermal conductivity detector is a single-filament thermal conductivity detector, and includes a measurement cell, a phase switching mechanism, and a measurement section. The measurement section starts measurement of thermal conductivity of a sample gas after a lapse of a sample gas measurement start time that is set in advance, after a reference phase is switched to a sample phase by the phase switching mechanism, and starts measurement of thermal conductivity of a reference gas after a lapse of a reference gas measurement start time that is set in advance as a length of time different from the sample gas measurement start time, after the sample phase is switched to the reference phase by the phase switching mechanism.

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Kyoto, Japan

Yuji Nakama