JP3456275B2 - High-sensitivity gas indicator - Google Patents
High-sensitivity gas indicatorInfo
- Publication number
- JP3456275B2 JP3456275B2 JP25815994A JP25815994A JP3456275B2 JP 3456275 B2 JP3456275 B2 JP 3456275B2 JP 25815994 A JP25815994 A JP 25815994A JP 25815994 A JP25815994 A JP 25815994A JP 3456275 B2 JP3456275 B2 JP 3456275B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- indicator
- passage
- opening
- specific gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、特定ガスと反応して変
色する指示薬層を有する高感度型ガスインジケータに関
する。
【０００２】
【従来の技術】特定ガス、例えばオゾンガスを検知する
ものとして、検知管とヨウ化カリウム澱粉紙とが挙げら
れる。
【０００３】しかし、検知管を用いる場合は、ガラス管
の先端部を折って使用するので危険であり、しかも一定
流量を吸入する専用の装置が必要である。また、ヨウ化
カリウム澱粉紙を用いる場合は、水をつける必要があ
り、その水質によってはいきなり変色してしまうことが
あり、しかもガスの有無しか分からず長時間オゾンに触
れていると元の色に戻ってしまう。
【０００４】そこで本発明者らは取扱いが容易で安全に
特定ガスを検知するガスインジケータを提案した（特願
平５−２１９４７０号）。
【０００５】図３（ａ）は本発明の前提となったガスイ
ンジケータの平面図、図３（ｂ）はそのＡ−Ａ線断面図
である。
【０００６】１は略板状に形成されたガスインジケータ
本体であり、ガスインジケータ本体１内には特定ガスを
導入する通路２が形成されている。通路２の内壁２ａに
は通路２に沿って特定ガスと反応して変色する指示薬層
３が貼り付けられている。ガスインジケータ本体１には
指示薬層３の変色を見るための透明な窓４が設けられて
おり、窓４に沿って１から６までの目盛５が記されてい
る。目盛５の数値は特定ガスのＣＴ値（（Ｃｏｎｃｅｎ
ｔｒａｔｉｏｎ×Ｔｉｍｅ、濃度の時間積分値）に対応
しており、例えばＣＴ値が低い場合には１、ＣＴ値が高
い場合には６というようになっている。
【０００７】このようなガスインジケータで特定ガスを
検知する場合、ガスインジケータを所定時間だけ特定ガ
スに晒すと、特定ガスが矢印Ｐ1 のように通路２の開口
２ｂから通路内に導入されて拡散し、開口に近い方から
変色する。変色域の面積は特定ガスのＣＴ値に応じた大
きさとなるので、目盛５と比較することによりＣＴ値が
分かるようになっている。
【０００８】
【発明が解決しようとする課題】しかしながら、図３に
示したガスインジケータは高濃度のガスを検知する場合
や低濃度のガスを長時間で検知する場合には問題がない
ものの、低濃度（例えば３ｐｐｍ）のガスを短時間で検
知する場合、通路の開口部の面積が非常に小さくしかも
通路が狭いため、開口部付近だけがごくわずかしか変色
せず読み取りにくいという問題があった。
【０００９】そこで、本発明の目的は、上記課題を解決
し、低濃度の特定ガスの有無と、特定ガスのＣＴ値とが
明確に分かる高感度型ガスインジケータを提供すること
にある。
【００１０】
【課題を解決するための手段】上記目的を達成するため
に本発明は、ガスインジケータ本体を略板状に形成する
と共にその内部に検知すべき特定ガスを導入する通路を
形成し、その通路の内壁には通路に沿って特定ガスと反
応して変色する指示薬層を貼り付け、インジケータ本体
に通路内の指示薬層の変色を見るための透明な窓を上記
通路に沿って設けたガスインジケータにおいて、ガスイ
ンジケータ本体に上記通路の端部に繋がり上面及び一側
面が外部に向かって開いた開口部を形成すると共に上記
指示薬層を上記開口部まで延出させ、上記ガスインジケ
ータ本体に上記窓に沿って特定ガスの濃度に対応する目
盛を記したものである。
【００１１】
【作用】上記構成によれば、上面及び一側面が外部に向
かって開いた開口部に設けられた指示薬層、すなわち特
定ガスにすぐに曝露される部分と、通路内に貼り付けら
れた指示薬層、すなわち特定ガスの拡散によって順次暴
露される部分とを有するので、高感度型ガスインジケー
タが低濃度の特定ガスに短時間暴露されてもすぐに反応
して変色して低濃度の特定ガスの有無が分かる。また低
濃度の特性ガスが拡散して通路内の指示薬層を変色させ
た場合にはＣＴ値も分かる。
【００１２】
【実施例】以下、本発明の一実施例を添付図面に基づい
て詳述する。
【００１３】図１（ａ）は本発明の高感度型ガスインジ
ケータの一実施例の平面図であり、図１（ｂ）はそのＢ
−Ｂ線断面図である。
【００１４】１０は略板状に形成されたガスインジケー
タ本体であり、ガスインジケータ本体１０内には特定ガ
スとしてのオゾンガスを導入する通路１１が形成されて
いる。通路１１の内壁１１ａには通路１１に沿ってオゾ
ンガスと反応して変色する指示薬層１２が貼り付けられ
ている。指示薬層１２はインジゴ系の染料と水分を保持
するシリカゲルとからなっている。
【００１５】ガスインジケータ本体１０には指示薬層１
２の変色を見るための窓１３が設けられている。さらに
ガスインジケータ本体１０にはオゾンガスがただちに接
することができる所定の面積の開口部１４が形成されて
おり、この開口部１４は通路１１の開口１１ｂと連通す
るように形成されている。
【００１６】ガスインジケータ本体１０には窓１３に沿
って１から４までの目盛１５が記されている。尚、目盛
１５に１から４までの数値を記す代わりに、オゾンガス
のＣＴ値及び単位を記してもよい。
【００１７】次に実施例の作用を述べる。
【００１８】所定の面積を有する開口部１４に設けられ
た指示薬層１２ａ、すなわちオゾンガスにすぐに曝露さ
れる部分と、通路１１内に貼り付けられた指示薬層１２
ｂ、すなわちオゾンガスの拡散によって順次暴露される
部分とを有するので、高感度型ガスインジケータが低濃
度（約３ｐｐｍ）のオゾンガスに暴露されると、矢印Ｐ
2 のようにオゾンガスが接触し、すぐに（約４０分、従
来は４０分以上曝露させても分かりにくかった）反応し
て青色から白色に変色して低濃度のオゾンガスの有無が
分かる。また低濃度のオゾンガスが拡散して通路１１内
の指示薬層１２ｂを変色させた場合にはＣＴ値も分か
る。
【００１９】図２（ａ）は高感度型ガスインジケータの
他の形状の参考実施例の平面図であり、図２（ｂ）はそ
のＣ−Ｃ線断面図である。
【００２０】図１に示した実施例との相違点は、一つの
ガスインジケータ本体に低ＣＴ値のオゾンガスを検知す
る領域と拡散層とが独立して形成されている点である。
【００２１】２０はガスインジケータ本体、２１は通
路、２２は通路側指示薬層、２３は窓、２４は低濃度の
オゾンガスと接するための所定の面積を有する開口部、
２５は開口部側指示薬層、２６は目盛をそれぞれ示して
いる。
【００２２】このような高感度型ガスインジケータにお
いても、図１に示した実施例と同様に、オゾンガスが矢
印Ｐ3 のように通路２１の開口２１ａから導入されると
共に、矢印Ｐ4 のようにすぐに開口側指示薬層２５と接
触して青色から白色に変色する。
【００２３】以上において本実施例によれば、特定ガス
にすぐに曝露される部分と拡散によって順次曝露される
部分とを有するので、低濃度の特定ガスの有無と、特定
ガスのＣＴ値とが明確に分かる。
【００２４】また、上述の図１及び図２の実施例におい
て、開口部は特定ガスが容易に指示薬層に触れるのであ
れば、メッシュや多孔質膜等でもよい。
【００２５】尚、上述の図１及び図２の実施例では指示
薬層をインジゴ系の染料とシリカゲルとで形成した場合
で説明したが、これに限定されるものではない。また目
盛の数字が１から４までの場合で説明したが、これに限
定されるものではない。
【００２６】
【発明の効果】以上要するに本発明によれば、次のよう
な優れた効果を発揮する。
【００２７】特定ガスにすぐに曝露される部分と拡散に
よって順次曝露される部分とを有するので、低濃度の特
定ガスの有無と、特定ガスのＣＴ値とが明確に分かる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly sensitive gas indicator having an indicator layer which changes color by reacting with a specific gas. 2. Description of the Related Art As a device for detecting a specific gas, for example, ozone gas, a detection tube and a potassium iodide starch paper can be mentioned. [0003] However, when a detection tube is used, it is dangerous because the tip of the glass tube is broken, and a dedicated device for inhaling a constant flow rate is required. Also, when using potassium iodide starch paper, it is necessary to add water, and depending on the quality of the water, discoloration may occur suddenly. Will return to. [0004] The present inventors have proposed a gas indicator for easily and safely detecting a specific gas (Japanese Patent Application No. 5-219470). FIG. 3A is a plan view of a gas indicator on which the present invention is based, and FIG. 3B is a sectional view taken along line AA of FIG. Reference numeral 1 denotes a gas indicator main body formed in a substantially plate shape, and a passage 2 for introducing a specific gas is formed in the gas indicator main body 1. An indicator layer 3 that reacts with a specific gas and changes color is attached to the inner wall 2 a of the passage 2 along the passage 2. The gas indicator main body 1 is provided with a transparent window 4 for seeing the discoloration of the indicator layer 3, and graduations 5 from 1 to 6 are marked along the window 4. The numerical value of the scale 5 is the CT value of the specific gas ((Concen)
transition × Time, the time integration value of density), for example, 1 when the CT value is low, and 6 when the CT value is high. [0007] When detecting a specific gas in such a gas indicator when exposed to only certain gas gas indicator predetermined time, the specific gas is introduced into the passage from the opening 2b of the passageway 2 as indicated by arrow P 1 diffusion Then, the color changes from the side closer to the opening. Since the area of the discoloration area has a size corresponding to the CT value of the specific gas, the CT value can be known by comparing with the scale 5. However, the gas indicator shown in FIG. 3 has no problem when detecting a high concentration gas or when detecting a low concentration gas for a long time. When a gas having a concentration (for example, 3 ppm) is detected in a short time, there is a problem that the area of the opening of the passage is very small and the passage is narrow. It is an object of the present invention to solve the above-mentioned problems and to provide a high-sensitivity gas indicator in which the presence or absence of a low-concentration specific gas and the CT value of the specific gas can be clearly understood. In order to achieve the above object, the present invention provides a gas indicator body having a substantially plate-like shape and a passage for introducing a specific gas to be detected therein, An indicator layer that reacts with a specific gas and discolors is attached to the inner wall of the passage along the passage, and a transparent window is provided on the indicator body to see the discoloration of the indicator layer in the passage.
In the gas indicator provided along the passage , the gas indicator main body is connected to the end of the passage and the upper surface and one side
The surface forms an opening that opens to the outside and
The indicator layer is extended to the opening, and the gas indicator
Along the window above the data body,
It is a sheng . According to the above construction, the upper surface and one side surface face outward.
Since it has an indicator layer provided in the opening thus opened , that is, a portion that is immediately exposed to the specific gas, and an indicator layer attached in the passage, that is, a portion that is sequentially exposed by the diffusion of the specific gas, Even if the high-sensitivity gas indicator is exposed to the low-concentration specific gas for a short period of time, it reacts immediately and changes color to determine the presence or absence of the low-concentration specific gas. Further, when the characteristic gas having a low concentration is diffused and the indicator layer in the passage is discolored, the CT value is also known. An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A is a plan view of one embodiment of the high-sensitivity gas indicator of the present invention, and FIG.
FIG. 4 is a cross-sectional view taken along line B. Reference numeral 10 denotes a gas indicator main body formed in a substantially plate shape. Inside the gas indicator main body 10, a passage 11 for introducing an ozone gas as a specific gas is formed. An indicator layer 12 that changes color by reacting with ozone gas is adhered to the inner wall 11 a of the passage 11 along the passage 11. The indicator layer 12 is made of an indigo dye and silica gel that retains moisture. The indicator layer 1 is provided on the gas indicator body 10.
A window 13 is provided for viewing the discoloration of No. 2. Further, the gas indicator main body 10 is formed with an opening 14 having a predetermined area through which the ozone gas can immediately contact, and this opening 14 is formed so as to communicate with the opening 11 b of the passage 11. The gas indicator main body 10 is provided with scales 1 to 4 along the window 13. Instead of writing the numerical values from 1 to 4 on the scale 15, the CT value and the unit of the ozone gas may be written. Next, the operation of the embodiment will be described. The indicator layer 12a provided in the opening 14 having a predetermined area, that is, the portion immediately exposed to the ozone gas, and the indicator layer 12a attached in the passage 11
b, that is, a portion which is sequentially exposed by the diffusion of ozone gas, so that when the sensitive gas indicator is exposed to low concentration (about 3 ppm) of ozone gas, the arrow P
As shown in 2 , the ozone gas comes into contact, immediately reacts (approximately 40 minutes, conventionally it was difficult to understand even if exposed for more than 40 minutes), and changes color from blue to white, indicating the presence or absence of low-concentration ozone gas. Also, when the low concentration ozone gas is diffused and the indicator layer 12b in the passage 11 is discolored, the CT value is also known. FIG. 2A shows a high-sensitivity gas indicator.
It is a top view of the reference example of another shape, and FIG.2 (b) is the CC sectional view taken on the line. The difference from the embodiment shown in FIG. 1 is that a region for detecting ozone gas having a low CT value and a diffusion layer are formed independently in one gas indicator main body. 20 is a gas indicator main body, 21 is a passage, 22 is a passage-side indicator layer, 23 is a window, 24 is an opening having a predetermined area for contacting low-concentration ozone gas,
Reference numeral 25 denotes an opening-side indicator layer, and reference numeral 26 denotes a scale. [0022] In such a high-sensitivity gas indicator, similarly to the embodiment shown in FIG. 1, the ozone gas is introduced from the opening 21a of the passage 21 as indicated by an arrow P 3, as indicated by the arrow P 4 Immediately, it comes into contact with the opening-side indicator layer 25 and changes its color from blue to white. As described above, according to the present embodiment, since there are portions that are immediately exposed to the specific gas and portions that are sequentially exposed by diffusion, the presence or absence of the low-concentration specific gas and the CT value of the specific gas are different. Clearly understand. Further, in the embodiment of FIGS. 1 and 2 described above,
The opening may be a mesh or a porous membrane as long as the specific gas easily contacts the indicator layer. In the embodiments of FIGS. 1 and 2, the case where the indicator layer is formed of an indigo dye and silica gel has been described, but the present invention is not limited to this. Also, the case where the scale number is 1 to 4 has been described, but the invention is not limited to this. In summary, according to the present invention, the following excellent effects are exhibited. Since there are portions that are immediately exposed to the specific gas and portions that are sequentially exposed by diffusion, the presence or absence of the low-concentration specific gas and the CT value of the specific gas can be clearly understood.
【図面の簡単な説明】
【図１】（ａ）は本発明の高感度型ガスインジケータの
一実施例の平面図であり、（ｂ）はそのＢ−Ｂ線断面図
である。
【図２】（ａ）は高感度型ガスインジケータの他の形状
の参考実施例の平面図であり、（ｂ）はそのＣ−Ｃ線断
面図である。
【図３】（ａ）は本発明の前提となったガスインジケー
タの平面図、（ｂ）はそのＡ−Ａ線断面図である。
【符号の説明】
１０ ガスインジケータ本体
１１ 通路
１１ａ 内壁
１２、１２ａ、１２ｂ 指示薬層
１３ 窓
１４ 開口部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a plan view of one embodiment of the high-sensitivity gas indicator of the present invention, and FIG. 1 (b) is a sectional view taken along the line BB. FIG. 2A is another shape of a high-sensitivity gas indicator.
It is a top view of a reference example of (a), (b) is the CC sectional view taken on the line. FIG. 3A is a plan view of a gas indicator on which the present invention is based, and FIG. 3B is a cross-sectional view taken along line AA. [Description of Signs] 10 Gas indicator body 11 Passage 11a Inner walls 12, 12a, 12b Indicator layer 13 Window 14 Opening
Claims (1)
ると共にその内部に検知すべき特定ガスを導入する通路
を形成し、その通路の内壁には通路に沿って特定ガスと
反応して変色する指示薬層を貼り付け、インジケータ本
体に通路内の指示薬層の変色を見るための透明な窓を上
記通路に沿って設けたガスインジケータにおいて、ガス
インジケータ本体に上記通路の端部に繋がり上面及び一
側面が外部に向かって開いた開口部を形成すると共に上
記指示薬層を上記開口部まで延出させ、上記ガスインジ
ケータ本体に上記窓に沿って特定ガスの濃度に対応する
目盛を記したことを特徴とする高感度型ガスインジケー
タ。(57) [Claim 1] A gas indicator main body is formed in a substantially plate shape, and a passage for introducing a specific gas to be detected is formed therein, and an inner wall of the passage is formed along the passage. Paste the indicator layer that changes color by reacting with the specific gas, and raise the transparent window on the indicator body to see the discoloration of the indicator layer in the passage.
In the gas indicator provided along the passage , the gas indicator main body is connected to the end of the passage,
The side forms an opening that opens to the outside and
The indicator layer is extended to the opening, and the gas
Corresponding to the specific gas concentration along the above window on the cater body
High-sensitivity gas indicator with scale marks .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25815994A JP3456275B2 (en) | 1994-10-24 | 1994-10-24 | High-sensitivity gas indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25815994A JP3456275B2 (en) | 1994-10-24 | 1994-10-24 | High-sensitivity gas indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08122318A JPH08122318A (en) | 1996-05-17 |
| JP3456275B2 true JP3456275B2 (en) | 2003-10-14 |
Family
ID=17316359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25815994A Expired - Fee Related JP3456275B2 (en) | 1994-10-24 | 1994-10-24 | High-sensitivity gas indicator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3456275B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5080024B2 (en) * | 2006-04-20 | 2012-11-21 | 株式会社サクラクレパス | Ozone indicator and method for detecting ozone |
| JP4732976B2 (en) * | 2006-07-31 | 2011-07-27 | 日本電信電話株式会社 | Gas detector holder |
| US11175234B2 (en) | 2010-09-07 | 2021-11-16 | Nextteq Llc | System for visual and electronic reading of colorimetric tubes |
-
1994
- 1994-10-24 JP JP25815994A patent/JP3456275B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08122318A (en) | 1996-05-17 |
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