JPS596441Y2 - Gas chromatograph - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas chromatograph, and particularly to a gas chromatograph suitable for use when a detector used for detecting sample content is sensitive to temperature.

In recent years, the performance of gas chromatographs has improved dramatically, and it has become possible to analyze even minute amounts of particles and samples with complex structures.

However, for this purpose, the stability of each part of the analyzer is required to be consistently high over a long period of time.

The present invention provides stable detection over a long period of time even when there are external temperature changes, especially when a detector sensitive to temperature changes such as a thermal conductivity type detector is used as a detector to detect sample fraction. The purpose is to provide a gas chromatograph that can be consistently realized.

First, the problems that occur when using a thermal conductivity detector in accordance with a conventional gas chromatograph will be explained below.

Figure 1 is an explanatory diagram of the main parts of a conventional gas chromatograph. 1 is a sample vaporization chamber constant temperature chamber, 2 is a column constant temperature chamber, 3 is a detector constant temperature chamber, 4 is a septum (sample injection port), and 5 is a sample vaporization chamber. 6 is a column, 7 is a flow path 8 is a detector.

Note that each thermostatic oven has a heating mechanism, etc. (not shown).

) is provided. The liquid sample injected from the septum 4 is gasified in the sample vaporization chamber 5.

This sample vaporization chamber 5 is provided within the sample vaporization chamber thermostatic chamber 1 and is always kept in a heated state.

This sample vaporization chamber constant temperature bath 1 does not necessarily need to be kept at a strictly constant temperature, but may be kept at a substantially constant temperature that can gasify the sample.

Then, the gasified sample is introduced into a column 6 installed in the column constant temperature bath 2 and separated for each sample fraction, and this separated sample or fraction passes through the flow path 7 and enters the detector 8, where it is detected. be done.

In this case, the detector 8 is still housed in the thermostatic chamber 3 for the detector, and sufficient consideration has been given to insulation, tight sealing, temperature control method, etc., so that it can operate stably. Since the detector 8 has a single layer structure, it is difficult to stably maintain the temperature around the detector 8 at a constant temperature for a long period of time in the case of severe disturbances.

The present invention is intended to solve the above-mentioned problems, and the gist of its structure is that a constant temperature chamber equipped with a unique temperature control means is provided in the constant temperature chamber of the sample vaporization chamber, and a detection The structure of the gas chromatograph is such that the detector chamber is placed in an atmosphere with approximately the desired temperature, and the temperature of the detector chamber is controlled using a unique temperature control means. The aim is to operate the system under extremely stable temperature conditions and enable precise chromatographic analysis.

Next, one embodiment of the present invention will be described with reference to FIG.

In Figure 2, the same numbers as in Figure 1 are numbered.
The same thing as the figure is shown.

As shown in the figure, the constant temperature chamber 3 for the detector is provided in the constant temperature chamber 1 of the sample vaporization chamber, and the temperature inside the constant temperature chamber 1 of the sample vaporization chamber is approximately equal to the temperature of the constant temperature chamber 3 for the detector, and is constant. Since the temperature is maintained, there is little disturbance to the detector constant temperature bath 3 itself, and therefore the detector 8 can be stably operated for a long period of time.

As detailed above, the present invention focuses on the fact that the temperature of the sample vaporization chamber constant temperature chamber 1 and the temperature of the detector constant temperature chamber 3 are approximately the same.
The detector constant temperature chamber 3 is installed in the sample vaporization chamber constant temperature chamber 1, which is an extremely simple structure, and the detector constant temperature chamber 3 is, so to speak, a double structure, so that the detector 8 can operate stably for a long time and perform accurate analysis. It is possible to do so, and its effects are extremely large when put to practical use.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the main parts of a conventional gas chromatograph, Figure 2
The figure is an explanatory diagram of a main part of an embodiment of the present invention. 1... Sample vaporization chamber constant temperature bath, 2... Column constant temperature bath, 3... Detector constant temperature bath, 4...
・Septum, 5...Sample vaporization chamber, 6...
- Column, 7...flow path, 8...detector.

Claims (1)

[Scope of utility model registration request] In a gas chromatograph, a sample gasified in a sample vaporization chamber installed in a constant temperature chamber is introduced into a separation tube, and each separated sample is detected by a detector for separate analysis. A gas chromatograph characterized in that a constant temperature chamber is provided with a unique temperature control means within the chamber, and a detector is housed within the constant temperature chamber.