JP2005249481A - Attachment for analyzer and analyzer using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analyzer capable of performing gas purge of an attachment simply and excellently. <P>SOLUTION: This attachment 12 for the analyzer provided detachably on a body 14 of the analyzer 10 is equipped with an optical system constituent member 18 for performing optical analysis together with the body 14. The attachment 12 for the analyzer is characterized as follows: the optical system constituent member 18 is provided; an attachment base 20 to be brought into contact with the analyzer body 14 when setting the attachment for the analyzer on the analyzer body 14 is provided; the attachment base 20 is provided with a purging hole 24 positioned on the periphery on an optical path 22 in the attachment 12 for the analyzer; and the periphery of the optical system constituent member 18 provided on the attachment base 20 is gas-purged through the purging hole 24 of the attachment base 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an accessory for an analyzer and an analyzer using the same, and particularly to an improvement in a gas purge mechanism for the accessory.

Conventionally, analyzers such as infrared spectrophotometers have been used to perform quantitative analysis or qualitative analysis of substances.
By the way, in the analysis in the infrared region, since the absorption peak due to water vapor in the air often overlaps the spectrum waveform of the substance, water vapor present in the air is troublesome to obtain highly accurate data. is there. In particular, when measuring a weak peak of a substance, the influence of water vapor in the air becomes more serious. Therefore, in the analysis in the infrared region, how to remove the influence of water vapor and the like in the air is important for obtaining accurate data.
For this reason, among the analyzers, those that perform infrared analysis in particular have a gas purge mechanism that purges the inside of the main body in order to effectively remove water vapor and the like (Patent Document 1, etc.). Conventionally, an infrared region analysis is performed using a purge mechanism while purging the entire main body of the analyzer.

By the way, in the analyzer, accessories are detachably provided in the main body sample chamber in order to perform various measurement methods according to the sample form.
In order to gas purge the accessory, conventionally, it is considered that the accessory is also indirectly gas purged by purging the entire main body sample chamber. Conventionally, it is also conceivable that after the accessory is set in the main body sample chamber, a gas pipe different from the gas pipe for the main body is provided in the accessory, and the entire accessory is directly gas purged.
Japanese Patent Laid-Open No. 10-332574

However, in the conventional method, it has been difficult to purify accessories easily and well.
That is, if the accessories are indirectly gas purged by gas purging the entire main body sample chamber, gas purging which is satisfactory in terms of purge time and purity cannot be performed.
On the other hand, in the case where the entire accessory is directly purged with gas, the gas purging can be performed better than in the case where the entire body sample chamber is purged with gas. Since it is necessary to perform the work of installing or removing the work, it takes time and costs.
The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an analyzer that can easily and satisfactorily perform a gas purge of accessories.

In order to achieve the above object, an accessory for an analyzer according to the present invention is detachably provided on a main body of an analyzer, and is used for an analyzer having an optical system component for performing optical analysis together with the main body. The accessory has an accessory base. The periphery of the optical system constituent member provided on the accessory base is purged from the main body of the analyzer through the purge hole of the accessory base.
Here, the accessory base is provided with the optical system constituent member, and when the analyzer accessory is set on the analyzer main body, the accessory base is brought into contact with the analyzer main body. The accessory base is provided with a purge hole at a location near the optical path in the accessory for the analyzer.

The accessory for an analyzer is provided with a purge case. It is preferable that the periphery of the optical system constituent member in the purge case is gas purged from the main body of the analyzer through the purge hole of the accessory base.
Here, the purge case seals the optical system component and communicates with the purge hole of the accessory base.
In order to achieve the above object, the analyzer according to the present invention is provided with the analyzer accessory in a detachable manner, and an analyzer provided with a main body for performing optical analysis together with the analyzer accessory And the said main body is provided with the main body base and the gas pipe | tube for accessories. The main body base is provided with a purge hole at a position near the optical path in the main body corresponding to the position of the purge hole of the accessory for the analyzer. The main body base and the accessory base are aligned so that the optical path in the accessory for the analyzer matches the optical path in the main body, and the accessory for the analyzer is attached to the main body of the analyzer , The purging hole of the main body base and the purging hole of the accessory base coincide with each other, and the purge gas from the accessory gas pipe is supplied to the purging hole of the main body base and the accessory base. It is introduced into the periphery of the optical system constituent member provided in the accessory base through the purge hole.

Here, the analyzer accessory is placed on the main body base in contact with the accessory base.
The accessory gas pipe is used to supply purge gas to the analyzer accessory.
In the analyzer, the main body is provided with an existing gas main. The accessory gas pipe communicates the gas main pipe with the purge hole of the main body base. When the accessory for the analyzer is placed on the main body of the analyzer, the purge gas from the gas main pipe is supplied to the accessory gas pipe, the purge hole for the main body base, and the purge hole for the accessory base. Therefore, it is preferable to introduce the optical system component around the accessory base.
Here, the gas main pipe is for supplying a purge gas for purging the inside of the main body.

  In the present invention, the meaning of being located near the optical path in the accessory (the main body of the analyzer) does not mean a portion that blocks the optical path. For example, the accessory (the main body of the analyzer) is indicated on the drawing. When viewed from directly above, it seems that the hole is almost located on the optical path, but in reality, it means that the optical path passes directly above the hole. Also, the hole is almost located on the optical path here. When the accessory (the main body of the analyzer) is viewed from directly above, the hole is completely coincident with the optical path, but not completely coincident, but in the vicinity of the optical path. Including what is located.

According to the accessory for an analyzer according to the present invention, the optical system constituting member is provided, and the accessory base is brought into contact with the analyzer main body when being set in the analyzer main body. Since the purge hole is provided in the vicinity of the optical path in the inside, the gas purge of the accessory is easily and satisfactorily performed through the purge hole of the accessory base from the main body of the analyzer.
In the present invention, by providing a purge case that seals the optical system constituent member of the accessory for an analyzer, gas purging of the accessory can be performed better.

The analyzer according to the present invention includes a main body base on which the accessory for the analyzer is placed in contact with the accessory base, the main body base corresponding to the position of the purge hole of the accessory base. Since the purge hole is provided in the vicinity of the optical path, the accessory gas purge can be performed easily and satisfactorily.
In the present invention, an accessory gas pipe is connected to an existing gas main pipe in the main body, and purge gas from the gas main pipe is supplied to the purge hole of the main body base via the accessory gas pipe. The gas purge of the accessory can be performed more easily.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of an analyzer according to an embodiment of the present invention. In addition, the figure (A) is the figure which looked at the main part of the accessory and the main body sample chamber from upper direction, and the figure (B) is AA sectional drawing of the figure (A).
The FTIR (analyzer) 10 shown in the figure includes an accessory (analyzer accessory) 12 and an FTIR main body 14.
The accessory 12 is detachably provided in a sample chamber 16 (hereinafter referred to as a main body sample chamber 16) of the FTIR main body 14, and an optical system component 18 for performing infrared analysis (optical analysis) together with the FTIR main body 14. Etc.

The optical system constituting member 18 is made of, for example, a wedge-shaped polarizer and the like, and is used for highly sensitive reflection measurement of a sample.
The accessory 12 includes an accessory base 20.
The accessory base 20 is provided with an optical system component 18 on the upper surface side thereof.
When the accessory 12 is set on the FTIR main body 14, the lower surface of the accessory base 20 is brought into contact with the FTIR main body 14.
The accessory base 20 is provided with a purge hole 24 at a location near the optical path 22 in the accessory 12. In the present embodiment, the accessory base 20 is provided with a purge hole 24 at a position that is spaced straight downward from the optical path 22 in the accessory 12.

For this purpose, the present embodiment further includes a purge case 26, a support member 28, and a purge pipe 30. The purge case 26 is supported by the accessory base 20 via a support member 28 and a purge pipe 30.
The purge case 26 seals the optical system component 18. The purge case 26 is provided with a hole 32 that communicates the inside and outside of the purge case 26.
The purge pipe 30 is hollow and has a purge gas flow path 34.
The hole 32 of the purge case 26 and the purge hole 24 of the accessory base 20 communicate with each other via the flow path 34 of the purge pipe 30.
Then, from the FTIR main body 14, through the purge hole 24 of the accessory base 20, the flow path 34 of the purge pipe 30, and the hole 32 of the purge case 26, the periphery of the optical system component 18 in the purge case 26 of the accessory 12. Is purged with gas.

In the present embodiment, the purge case 26 substantially seals only the optical path 22 in the accessory 12, and the purge gas flow path from the FTIR body 14 on the optical path 22 in the accessory 12. Is focused on.
The FTIR main body 14 includes a sample chamber base (main body base) 36 and a gas pipe 38 for accessories.
The accessory 12 is placed in the sample chamber base 36 in contact with the accessory base 20.
The accessory gas pipe 38 is for supplying purge gas to the accessory 12.
The sample chamber base 36 is provided with a purge hole 40 at a position near the optical path 22 in the FTIR main body 14 corresponding to the position of the purge hole 24 of the accessory base 20. The sample chamber base 36 is provided with a purge hole 24 at a position that is spaced straight downward from the optical path 22 in the FTIR main body 14.

In the present embodiment, the sample chamber base 36 is positioned near the optical path 22 in the FTIR body 14 in order to easily optically position the accessory 12 with respect to the FTIR body 14. A delivery pin 42 is provided. The accessory base 20 is provided with a positioning hole 44 at a position near the optical path 22 in the accessory 12 corresponding to the position of the positioning pin 42 of the sample chamber base 36.
Further, in the present invention, the meaning of being located near the optical path 22 in the accessory 12 (FTIR main body 14) does not mean a portion that blocks the optical path 22, and for example, in FIG. When 12 (FTIR main body 14) is viewed from directly above, the purge holes 24 and 40 appear to be substantially located on the optical path 22, but actually, as shown in FIG. , 40, the light path 22 passes through.
FIG. 2 shows an overall view of the analyzer 10.

Further, in the present embodiment, as shown in the figure, the FTIR main body 14 includes an existing gas main pipe 46 in the FTIR main body 14. The gas main pipe 46 is for supplying purge gas for purging the interferometer chamber 48 and the detector chamber 50, for example. The accessory gas pipe 38 connects the existing gas main pipe 46 and the purge hole 40 of the sample chamber base 36 to the FTIR main body 14.
The analyzer 10 according to the present embodiment is configured as described above, and its operation will be described below.

The accessory 12 for performing an appropriate measurement method is selected according to the characteristics (shape, material, property, etc.) of the sample, and the optical path 22 in the accessory 12 and the optical path 22 in the FTIR body 14 are matched. Then, the accessory 12 is set on the FTIR main body 14.
Here, in the present embodiment, on the FTIR main body 14 side, the gas can be ejected from the purge hole 40 of the sample chamber base 36. For this purpose, the sample chamber base 36 is provided with a purge hole 40 at a position on the optical path 22 in the FTIR body 14 corresponding to the position of the purge hole 24 of the accessory base 20. Yes. The purge hole 40 of the sample chamber base 36 communicates with the existing gas main pipe 46 in the FTIR main body 14 via the accessory gas pipe 38.

On the other hand, in the present embodiment, on the accessory 12 side, the installation surface is structured such that the gas at the ejection position on the FTIR main body 14 side can flow in. For this purpose, the accessory base 20 is provided with a purge hole 24 at a location in the accessory 12 near the optical path 22.
Therefore, in the present embodiment, simply by setting the accessory 12 in the main body sample chamber 16, the purge hole 40 of the sample chamber base 36 and the purge hole 24 of the accessory base 20 that become the gas ejection position of the FTIR main body 14. And the position is suitable. As a result, the purge gas from the gas main pipe 46 existing in the FTIR main body 14 is purged from the accessory 12 through the accessory gas pipe 38, the purge hole 40 of the sample chamber base 36 and the purge hole 24 of the accessory base 20. It is introduced into the case 26.

  Here, also in the past, it is conceivable to indirectly purge the accessories by gas purging the entire main body sample chamber. Further, for example, it is conceivable that purge gas flowing into the sample chamber from the detector chamber of the FTIR main body is led to the accessory side by a pipe extending from the accessory to the wall of the sample chamber. However, these conventional methods can easily purge the accessories, but have problems such as a long purge gas replacement time and a low purge gas replacement rate (purity).

On the other hand, in order to improve these points, it is also possible to provide a pipe separately from the FTIR main body and connect this pipe to the purge piping port provided on the front panel of the accessory to purge the accessory directly. Conceivable. However, in this conventional method, every time an accessory is attached to or detached from the main body sample chamber, a work for installing the pipe on the accessory or a work for removing the pipe must be performed, which takes time and increases the cost.
For this reason, conventionally, there has been no technology that can simultaneously improve the ease of work and the goodness of purge in the gas purge of accessories.

In contrast, in the present embodiment, as described above, purge holes 24 and 40 are provided at appropriate positions on the sample chamber base 36 and the accessory base 20, respectively, and the accessory 12 can be purged of gas through the FTIR body 14. I am doing so.
Therefore, in this embodiment, simply by setting the accessory 12 in the main body sample chamber 16, the gas purge of the accessory 12 can be easily performed through the FTIR main body 14 without performing an operation of newly installing a pipe in the accessory 12. And it can be done well.
In the present embodiment, the purge function for the existing interferometer chamber 48, the detector chamber 50 and the like is used in the FTIR main body 14 as a purge mechanism for the accessory 12. For this reason, in this embodiment, the labor of piping when purging the accessories can be greatly reduced as compared with the case where the piping work must be performed every time the accessories are attached and detached. Moreover, since the piping itself is not necessary, the cost is reduced.

In the present embodiment, the entire sample chamber 16 and the entire accessory 12 are not purged, but the optical path 22 in the accessory 12 is directly purged. For this reason, in the present embodiment, the purge case 26 substantially seals only the optical path 22 in the accessory 12, so that the FTIR main body 14 has the optical path 22 in the accessory 12. The purge gas flow path is formed, and the gas purge is focused on the optical path 22 in the accessory 12.
Therefore, in the present embodiment, the gas sample can be purged on the optical path 22 in the accessory 12 earlier than in the case of purging the entire main body sample chamber 16 and the entire accessory 12. Time is shortened. Moreover, since the optical path 22 in the necessary accessory 12 can be replaced with high purity, the purge gas replacement rate is high. As a result, a stable spectrum can be obtained without being affected by changes in the atmosphere.

In this embodiment, it is also important to satisfy both the versatility of the apparatus and the certainty of purge. For this reason, the position of the purge hole 24 of the accessory base 20 and the position of the purge hole 40 of the sample chamber base 36 are important. The relationship with is very important.
That is, the accessory 12 may have any shape as long as it can be placed on the sample chamber base 36, but the accessory 12 must be positioned on the optical path 22 of the FTIR main body 14. On the other hand, any type of accessory 12 must always be present near the FTIR body 14 on the optical path 22.
For this reason, in the present embodiment, the sample chamber base 36 of the FTIR main body 14 is provided with a purge hole 40 at a position near the optical path 22 in the FTIR main body 14. In addition, the accessory base 20 of the accessory 12 is provided with a purge hole 24 at a position near the optical path 22 in the accessory 12 corresponding to the position of the purge hole 40 of the sample chamber base 36. Yes.

As a result, in this embodiment, when the accessory 12 is set in the FTIR main body 14, the purge hole 24 of the accessory base 20 is always the purge hole of the sample chamber base 36 in any shape of the accessory 12. Since it is located on 40, purging can be performed more reliably as compared with those in which the position of the purge holes 24, 40 is not devised.
Therefore, in this embodiment, the versatility with respect to the apparatus can be surely obtained as compared with the case where the positional relationship between the purge holes 24 and 40 is not devised. In addition, the optical positioning of the accessory 12 with respect to the FTIR body 14 can be performed reliably.

In the present embodiment, the sample chamber base 36 is positioned near the optical path 22 in the FTIR main body 14 in order to facilitate the reliable positioning of the accessory 12 with respect to the FTIR main body 14. Pins 44 are provided. The accessory base 20 is provided with a positioning hole 46 at a position near the optical path 22 in the accessory 12 corresponding to the position of the positioning pin 44.
As a result, when the accessory 12 is set in the main body sample chamber 16, the positioning pin 42 of the sample chamber base 36 and the positioning hole 44 of the accessory base 20 are made to coincide with each other. The optical path 22 and the optical path 22 in the FTIR body 14 can be easily and reliably matched. Further, since the positions of the purge hole 24 of the accessory base 20 and the purge hole 40 of the sample chamber base 36 are surely matched, purging can be performed more easily and reliably.
The present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the gist of the invention.

FTIR body In the present embodiment, it is preferable that the interferometer chamber 48 and the detector chamber 50 of the FTIR body 14 have a sealed structure such as a purge case.
The interferometer chamber 48 seals the light emitting means 52 including an interferometer that emits interference light in the infrared region.
The detector chamber 50 seals the detector 54 that converts the optical signal from the sample chamber 16 into an electrical signal.
In this way, the light emitting means 52 and the detector 54 are each sealed structure, and by introducing the purge gas from the gas main pipe 46, the light emitting means 52 and the detector are detected more quickly and with higher purity than those without the sealed structure. The gas around the vessel 54 can be purged.

In this embodiment, the FTIR main body 14 includes an electrical circuit 56 that samples a signal from the detector 54 and converts an analog signal into a digital signal.
Further, in the present embodiment, the FTIR 10 includes a computer 58 and a purge device main body 60.
The computer 58 includes a computer main body 62, a display 64, and an input device 66. The computer main body 62 Fourier-transforms the signal from the electric system circuit 56 to obtain an infrared spectrum. The computer main body 62 displays this on the display 64.

The purge device main body 60 includes a gas supply means 68, a main valve 70, and a valve drive circuit 72.
The gas supply means 68 is connected to the gas main pipe 46 of the FTIR main body 14 via the main valve 70 and supplies a purge gas such as nitrogen gas.
In the present embodiment, the gas main pipe 46 is connected to the detector chamber 50 via a detector valve 74, and is connected to the interferometer chamber 48 via an interferometer valve 76.
In the present embodiment, the accessory gas pipe 38 communicates the gas main pipe 46 with the hole 40 of the sample chamber base 36, and includes an accessory valve 78 in the middle of the accessory gas pipe 38. Is also preferable.

In addition, the valves 74, 76, and 78 are controlled to be opened and closed and the flow rate by the valve drive circuit 72 and the computer main body 62.
In particular, after the accessory 12 is placed in the main body sample chamber 16, the computer main body 62 opens and closes the accessory valve 78 and controls the flow rate via the valve driving circuit 72. The purge gas is introduced while the accessory valve 78 is open, and the flow rate of the purge gas is controlled by adjusting the opening amount.
That is, the purge gas from the gas main pipe 46 existing in the FTIR main body is appropriately put into the purge case 26 of the accessory 12 through the purge hole 40 of the sample chamber base 36 and the purge hole 24 of the accessory base 20. It is introduced at a reasonable flow rate. On the other hand, after completion of the measurement, the computer main body 62 closes the valves 74, 76 and 78 and stops the introduction of the purge gas.

Accessory recognition mechanism In this embodiment, it is also preferable to provide an accessory recognition mechanism for recognizing the type of accessory. For example, the accessory base is provided with an accessory recognition tag that stores information on the optimum gas purge setting for the accessory at a location near the optical path in the accessory. In addition, it is preferable to provide a reader for reading the information of the accessory recognition tag at a position where the sample chamber base is located on the optical path in the main body. This makes it possible to more reliably recognize the type of accessory compared to an accessory recognition tag and a reader provided at a different position, thereby improving the versatility of the accessory.
Also, just by setting the accessory in the main body sample chamber, setting information (valve open / close control, flow rate control, etc.) relating to the optimum gas purge for the accessory is sent to the computer main body via the reader. Based on the read information, the computer main body 62 performs open / close control and flow rate control of the accessory valve 78, and can automatically perform a gas purge optimum for the type of accessory (sample form, measurement method, etc.).

In the above-described vacuum, the example in which the accessory 12 is gas purged through the purge holes 24 and 40 has been described. However, the inside of the purge case of the accessory 12 through the purge holes 24 and 40 using a vacuum pump is used. It can also be a vacuum. Further, by newly providing a vacuum hole, it is possible to perform gas purge through the purge hole while evacuating the interior of the accessory through the vacuum hole. Even in this case, it is particularly preferable that the accessory base is provided with a vacuum hole at a position near the optical path in the accessory. It is particularly preferable that the sample chamber base is provided with a vacuum hole at a position close to the optical path in the main body corresponding to the position of the vacuum hole provided in the accessory base.

In the above-described configuration, an example in which a wedge-shaped polarizer or the like is used to perform a highly sensitive reflection measurement method has been described, but the present invention is not limited to this. For example, in addition to the high-sensitivity reflection measurement method, various measurement methods such as ATR method, transmission method, KBr method, diffuse reflection method, polarization reflection method, regular reflection method, microscopic / transmission method, microscopic / reflection method, etc. Corresponding. In addition to the wedge-shaped polarizer, the constituent members correspond to those necessary for performing each measurement method.
The present invention can also be applied to an accessory as shown in FIG. 3, for example. FIG. 4A is a view of the accessory as viewed from above, and FIG. 4B is a cross-sectional view taken along the line A-A in FIG. The parts corresponding to those in FIG.

The accessory 112 shown in the figure is an optical system constituent member 118 different from the optical system constituent member shown in FIG. 1, but includes an accessory base 120 as in the above configuration. The accessory base 120 is provided with a purge hole 124 at a position near the optical path 122 in the accessory 112.
In addition, the accessory 112 includes a purge case 126 that seals the optical system component 118 in the same manner as described above.
Therefore, also in the accessory 112 provided with the optical system component 118, the inside of the purge case 126 passes through the purge hole 124 of the accessory base 120 from the FTIR main body just by placing it in the main body sample chamber as in the above-described configuration. Since the gas is purged or evacuated, gas replacement around the optical system component 118 of the accessory 112 can be easily and satisfactorily performed.

In addition, in the above-described configuration, the example in which the main body sample chamber is detachable as an accessory has been described. However, the present invention is not limited to this, and the main body interferometer chamber has the light emitting means as an accessory. It can also be applied to a device provided detachably in the main body and a detector provided as an accessory in the main body detector chamber.

It is explanatory drawing of the main part of the accessory of the analyzer concerning one Embodiment of this invention, and a main body. It is explanatory drawing of the whole analyzer concerning this embodiment. It is a modification of the accessory concerning this embodiment.

Explanation of symbols

10 FTIR (analyzer)
12, 112 Accessories (Analyzer accessories)
14 FTIR main unit (analyzer main unit)
20,120 Accessory base 24,124 Accessory base purge hole 26,126 Purge case 36 Sample chamber base (main body base)
40 Purge hole for main body base

Claims (4)

In the accessory for an analyzer, which is provided detachably on the main body of the analyzer and has an optical system component for performing optical analysis together with the main body,
The optical system component member is provided, and includes an accessory base that is brought into contact with the main body of the analyzer when the accessory for the analyzer is set on the main body of the analyzer,
The accessory base is provided with a purge hole at a position near the optical path in the accessory for the analyzer,
An accessory for an analyzer, wherein the periphery of an optical system component member provided in the accessory base is purged from the main body of the analyzer through a purge hole in the accessory base. The accessory for an analyzer according to claim 1,
The optical system component is sealed, and a purge case is provided that communicates with the accessory-based purge hole,
An accessory for an analyzer, wherein the periphery of an optical system component in the purge case is purged from the main body of the analyzer through a purge hole in the accessory base. An analyzer provided with the analyzer accessory according to claim 1 or 2 detachably, and comprising a main body for performing an optical analysis together with the analyzer accessory,
The main body has a main body base on which the accessory for the analyzer is placed in contact with the accessory base;
An accessory gas tube for supplying purge gas to the analyzer accessory;
With
The main body base is provided with a purge hole at a position close to the optical path in the main body corresponding to the position of the purge hole of the accessory base,
The main body base and the accessory base are aligned so that the optical path in the accessory for the analyzer matches the optical path in the main body, and the accessory for the analyzer is attached to the main body of the analyzer , The purging hole of the main body base and the purging hole of the accessory base coincide with each other, and the purge gas from the accessory gas pipe is supplied to the purging hole of the main body base and the accessory base. The analyzer is introduced to the periphery of the optical system constituent member provided in the accessory base through the purge hole. The analyzer according to claim 3, wherein
The main body is provided with an existing gas main for supplying a purge gas for purging the inside of the main body,
The accessory gas pipe communicates the gas main pipe with the purge hole of the main body base,
When the accessory for the analyzer is placed on the main body of the analyzer, the purge gas from the gas main pipe is supplied to the accessory gas pipe, the purge hole for the main body base, and the purge hole for the accessory base. Through the periphery of an optical system component provided on the accessory base.

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