US 2016/0103105 A1 · THERMAL CONDUCTIVITY DETECTOR AND GAS CHROMATOGRAPH

Abstract

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.

Claims10

Dependent claims

A thermal conductivity detector comprising:

a cell member provided with a cell space including a fluid inlet and a fluid outlet;
a temperature sensing element, accommodated inside the cell space, whose electrical resistance is changed according to thermal conductivity of a fluid flowing through the cell space;
a detection circuit for detecting a change in the electrical resistance of the temperature sensing element;
a buffer space connected to the fluid outlet of the cell space and having a cross-sectional area that is greater than a cross-sectional area of the fluid outlet;
and
a discharge channel connected to a fluid outlet of the buffer space and having a cross-sectional area that is smaller than the cross-sectional area of the buffer space.

3 more elements

A gas chromatograph for supplying carrier gas to a column through a sample introduction section, and detecting, by a thermal conductivity detector, a gas component that has been separated by and that has flowed out from the column,

wherein the thermal conductivity detector comprising:
a cell member provided with a cell space including a fluid inlet and a fluid outlet;
a temperature sensing element, accommodated inside the cell space, whose electrical resistance is changed according to thermal conductivity of a fluid flowing through the cell space;
a detection circuit for detecting a change in the electrical resistance of the temperature sensing element;
a buffer space connected to the fluid outlet of the cell space and having a cross-sectional area that is greater than a cross-sectional area of the fluid outlet;
and
a discharge channel connected to a fluid outlet of the buffer space and having a cross-sectional area that is smaller than the cross-sectional area of the buffer space.

4 more elements

Dependencies are inferred from the claim text.

Thermal conductivity detector and gas chromatograph

Life of this patent

Thermal conductivity detector and gas chromatograph

Life of this patent

Abstract

Claims10