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Gas Chromatograph and Zero Point Adjustment Method

A gas chromatograph and zero-point adjustment technology, which is applied in the field of gas chromatographs and can solve problems such as low resolution and inability to zero-point adjustment.

Active Publication Date: 2020-07-14
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the following problems arise: low resolution, inability to perform fine zero point adjustment

Method used

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  • Gas Chromatograph and Zero Point Adjustment Method
  • Gas Chromatograph and Zero Point Adjustment Method
  • Gas Chromatograph and Zero Point Adjustment Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] 1. The overall composition of the gas chromatograph

[0042] figure 1 It is a schematic diagram showing a configuration example of a gas chromatograph according to an embodiment of the present invention. This gas chromatograph is used for analysis by supplying sample gas and carrier gas into the chromatographic column 1, and in addition to the above-mentioned chromatographic column 1, it also includes a column oven 2, a sample introduction part 3, a detector 4, etc. .

[0043] The chromatographic column 1 is composed of, for example, a packed column, and is heated in the column oven 2 during analysis. The carrier gas is introduced into the chromatography column 1 from the sample introduction part 3 together with the sample gas. The sample components contained in the sample gas are separated during the passage through the chromatography column 1 and detected by the detector 4. The detector 4 is composed of, for example, a TCD (thermal conductivity detector).

[0044] The sa...

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PUM

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Abstract

The present invention provides a gas chromatograph that is less likely to cause drift in an output signal from a zero-adjusted thermal conductivity detector, and a zero adjustment method. Multiple stages of zero adjustment are performed on the output signal from the detector. The zero adjustment in multiple stages includes fine adjustment (first adjustment) and intermediate adjustment (second adjustment). In the fine adjustment, the output signal from the detector can be adjusted within the fine adjustment range (first adjustment range). In the intermediate adjustment, the output signal from the detector can be adjusted in an intermediate adjustment range (second adjustment range) wider than the fine adjustment range. If there is a zero point in the fine adjustment range of the output signal of the detector when the sample component does not flow through the cell, the zero adjustment is performed by fine adjustment. If there is no zero point in the fine adjustment range, the fine adjustment is performed after the intermediate adjustment.

Description

Technical field [0001] The invention relates to a gas chromatograph for performing zero point adjustment on an output signal from a thermal conductivity detector and a zero point adjustment method. Background technique [0002] Conventionally, a gas chromatograph having a TCD (thermal conductivity detector) as a detector has been used. The TCD includes a bridge circuit having a plurality of heating wires, which are provided in a cell body (for example, refer to Patent Document 1 below). [0003] The cell body of the TCD is provided with, for example, a measurement gas flow path and a reference gas flow path. A mixed gas (measurement gas) of the sample component separated by the column of the gas chromatograph and the carrier gas flows in the measurement gas flow path. On the other hand, a carrier gas (reference gas) that does not contain sample components flows in the reference gas flow path. In the tank body, for example, two heating wires are arranged in each flow path, for a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/66
CPCG01N30/66
Inventor 小岛雅弘
Owner SHIMADZU SEISAKUSHO CO LTD