JPH0422288Y2 - - Google Patents
Info
- Publication number
- JPH0422288Y2 JPH0422288Y2 JP1982115868U JP11586882U JPH0422288Y2 JP H0422288 Y2 JPH0422288 Y2 JP H0422288Y2 JP 1982115868 U JP1982115868 U JP 1982115868U JP 11586882 U JP11586882 U JP 11586882U JP H0422288 Y2 JPH0422288 Y2 JP H0422288Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- base
- gas detection
- detection element
- casing
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 29
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は接触燃焼型のガスセンサの改良に関す
る。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a catalytic combustion type gas sensor.
第１図は従来のガスセンサの一例を示す断面構
成図である。この第１図に示されるように、プラ
ステイツク等の絶縁性基台１を挿通して設けられ
た２本の電極ピン２ａ，２ｂの一端間に、接触燃
焼型のガス検知素子３が固定される。そして、こ
のガス検知素子３を覆つて網体からなる異物遮蔽
体４が設けられ、リング状の押え治具５により上
記遮蔽体４を基台１に固定してガスセンサが構成
される。尚、前記ガス検知素子３は、例えば第２
図に示すように白金や白金合金からなる線材３ａ
を10ターン程度巻回し、その上にAl2O3等の多孔
質の担体３ｂを付着させたのち、更にその上に貴
金属触媒３ｃを塗布する等した構成を有してい
る。
FIG. 1 is a cross-sectional configuration diagram showing an example of a conventional gas sensor. As shown in FIG. 1, a catalytic combustion type gas detection element 3 is fixed between one ends of two electrode pins 2a and 2b inserted through an insulating base 1 made of plastic or the like. . A foreign matter shielding body 4 made of a net is provided to cover the gas detection element 3, and the shielding body 4 is fixed to the base 1 by a ring-shaped holding jig 5, thereby constructing a gas sensor. Note that the gas detection element 3 is, for example, a second
As shown in the figure, a wire rod 3a made of platinum or platinum alloy
is wound around 10 turns, a porous carrier 3b made of Al 2 O 3 or the like is attached thereon, and then a noble metal catalyst 3c is further applied thereon.
ところがこのような構成のガスセンサを用いて
ガス検出装置を構成し、上記ガスセンサを測定雰
囲気中に晒した場合、その雰囲気温度の変化の影
響を直接受けて素子温度が変化し、この変化によ
つて検出特性が変化する問題があつた。また、素
子の表面にガス検知には有害な不純物が付着し易
く、この不純物の、いわゆる被毒によつて寿命が
短いと言う問題もあつた。 However, when a gas detection device is configured using a gas sensor with such a configuration and the gas sensor is exposed to a measurement atmosphere, the element temperature changes due to the direct influence of changes in the ambient temperature, and this change causes There was a problem that the detection characteristics changed. In addition, impurities harmful to gas detection tend to adhere to the surface of the element, and this impurity causes poisoning, resulting in a short lifespan.
本考案はこのような事情を考慮してなされたも
ので、その目的とするところは、ガス検知素子の
動作の安定化を図れるとともに長寿命化を図れる
簡易で実用性の高い構成のガスセンサを提供する
ことにある。
The present invention was developed taking these circumstances into consideration, and its purpose is to provide a gas sensor with a simple and highly practical configuration that can stabilize the operation of the gas detection element and extend its life. It's about doing.
本考案に係るガスセンサは、絶縁性の基台と、
この基台を挿通して設けられた２本の電極ピン
と、これら電極ピンの一端間に取付けられた接触
燃焼型のガス検知素子と、一端側が前記基台の縁
部に固定されるとともに他端側が上記ガス検知素
子を囲むように延びて開口部を１つしか持たない
ガス検知素子保温用の空間を形成する筒状のケー
シングと、このケーシングまたは前記基台に固定
されて前記ガス検知素子を覆つてなる異物遮蔽体
とを具備してなることを特徴としている。
The gas sensor according to the present invention includes an insulating base,
Two electrode pins are inserted through this base, a catalytic combustion type gas detection element is installed between one ends of these electrode pins, one end is fixed to the edge of the base, and the other end is fixed to the edge of the base. A cylindrical casing whose sides extend so as to surround the gas sensing element and which has only one opening to form a space for keeping the gas sensing element warm; It is characterized by comprising a foreign matter shielding body covering the body.
〔考案の効果〕
かくして本考案によれば、ガス検知素子が筒状
のケーシングによつて囲まれるので、筒内部の保
温効果による動作安定化が図られる。これ故、測
定雰囲気中に直接晒される場合であつても常に安
定に動作し得るもので、信頼性良くガス検出を行
うことが可能となる。また、ガス検知素子は基台
および基台に固定された筒状のケーシングによつ
て囲まれた空間、つまり開口部を１つしか持たな
い狭い部屋内に収容されている形態となる。この
ため、ガス検知素子への影響を開口部からの自然
拡散のみで行わせることができ、ガス検知素子へ
の被毒を弱めることができるので、ガス感度の劣
化の程度を少なくすることができ、長寿命化を図
ることができる。[Effects of the Invention] Thus, according to the present invention, since the gas detection element is surrounded by the cylindrical casing, the operation can be stabilized due to the heat retention effect inside the cylinder. Therefore, even when directly exposed to the measurement atmosphere, it can always operate stably, making it possible to perform gas detection with high reliability. Further, the gas detection element is housed in a space surrounded by a base and a cylindrical casing fixed to the base, that is, a narrow room having only one opening. Therefore, the effect on the gas detection element can be caused only by natural diffusion from the opening, and the poisoning of the gas detection element can be weakened, making it possible to reduce the degree of deterioration of gas sensitivity. , a longer life can be achieved.
以下、図面を参照して本考案の一実施例につき
説明する。
Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第３図は実施例に係るガスセンサを示す断面構
成図である。このガスセンサが特徴とするところ
は、押え治具５の代りに筒状のケーシング６を用
いて異物遮蔽体４を基台１に固定すると共に、上
記ケーシング６の側壁にてガス検知素子３を囲む
ようにした点にある。このケーシング６は、押え
治具５の上縁部を伸ばし、これを筒状部としたも
のと看做すこともできる。これにより、ガス検知
素子３は、ケーシング６の筒内部に位置するもの
となる。 FIG. 3 is a cross-sectional configuration diagram showing a gas sensor according to an example. This gas sensor is characterized by using a cylindrical casing 6 instead of the holding jig 5 to fix the foreign object shield 4 to the base 1, and to surround the gas detection element 3 with the side wall of the casing 6. This is what I did. This casing 6 can also be regarded as a cylindrical portion formed by elongating the upper edge of the holding jig 5. Thereby, the gas detection element 3 is located inside the cylinder of the casing 6.
かくして、このような構成のガスセンサによれ
ば、これを測定雰囲気中に晒しても、ケーシング
６による保温効果によつてガス検知素子３の動作
温度が安定に保たれるので、動作の安定化と信頼
性の確保を図り得る。しかも、上記の保温効果に
よつて、高濃度のガスが加わる場合であつても、
ガス検知素子３がその接触燃焼反応によつて徐々
に温度変化を呈するので、素子特性が急激に劣化
する等の不具合を招くこともない。また、ガス検
知素子３は基台１および基台１に固定された筒状
のケーシング６によつて囲まれた空間、つまり開
口部を１つしか持たない狭い部屋内に収容されて
いる形態となる。このため、ガス検知素子３への
影響を開口部からの自然拡散のみで行わせること
ができ、ガス検知素子３への被毒を弱めることが
できるので、ガス感度の劣化の程度を少なくする
ことができ、長寿命化を図ることができる。第５
図はガス感度の経時変化を示すもので、図中Ａは
開口部からの自然拡散のみでガスをガス検知素子
に接触させるようにした本考案の特性を示し、図
中Ｂは第１図に示した従来例のように対流と自然
拡散との併用でガスをガス検知素子に接触させる
ようにしたものの特性を示している。この図から
判るように、本考案の構成を採用すると長寿命化
を実現できる。 Thus, according to the gas sensor having such a configuration, even if it is exposed to the measurement atmosphere, the operating temperature of the gas sensing element 3 is kept stable due to the heat insulation effect of the casing 6, which contributes to stabilization of the operation. Reliability can be ensured. Moreover, due to the above-mentioned heat retention effect, even when a high concentration of gas is added,
Since the gas detection element 3 exhibits a gradual temperature change due to the catalytic combustion reaction, problems such as rapid deterioration of element characteristics are not caused. Further, the gas detection element 3 is housed in a space surrounded by the base 1 and a cylindrical casing 6 fixed to the base 1, that is, a narrow room having only one opening. Become. Therefore, the gas detection element 3 can be affected only by natural diffusion from the opening, and the poisoning of the gas detection element 3 can be weakened, thereby reducing the degree of deterioration of gas sensitivity. It is possible to extend the service life. Fifth
The figure shows the change in gas sensitivity over time. A in the figure shows the characteristics of the present invention in which the gas is brought into contact with the gas detection element only by natural diffusion from the opening, and B in the figure shows the characteristics of the present invention, which is the same as in Figure 1. This figure shows the characteristics of a conventional example in which gas is brought into contact with a gas detection element using both convection and natural diffusion. As can be seen from this figure, if the configuration of the present invention is adopted, a longer life can be achieved.
また本構造のガスセンサは、押え治具５に代え
て、この押え治具の機能をも併せて持つケーシン
グ６を用いるだけで簡易に実現できるので、その
実用的利点も非常に高い。 Moreover, the gas sensor of this structure can be easily realized by simply using the casing 6 which also has the function of the holding jig in place of the holding jig 5, and therefore has a very high practical advantage.
第４図はこのようなガスセンサを用いて構成さ
れるガス検電圧装置の一例を示すものであり、Sa
はガス検知素子３の触媒３ｃを除いて構成された
ダミーセンサ、Sbは上記構成のガスセンサであ
る。これらのセンサSa，Sbと標準抵抗Ra，Rbと
を用いてブリツジ回路を構成し、且つ上記ダミー
センサSaに温度補償抵抗RTを並列に接続してガ
ス検出装置が構成される。 Figure 4 shows an example of a gas voltage detection device configured using such a gas sensor .
is a dummy sensor configured by excluding the catalyst 3c of the gas detection element 3, and S b is a gas sensor configured as described above. A bridge circuit is constructed using these sensors S a and S b and standard resistors R a and R b , and a temperature compensation resistor R T is connected in parallel to the dummy sensor S a to construct a gas detection device. Ru.
このようにすれば、前述したガスセンサ自体の
動作安定化と相俟つて高精度で信頼性良くガス検
出を行うことが可能となる。 In this way, in addition to stabilizing the operation of the gas sensor itself as described above, it becomes possible to perform gas detection with high precision and reliability.
尚、本考案は上記実施例に限定されるものでは
ない。例えば異物遮蔽体４をケーシング６の開口
部に取付け固定するようにしてもよい。またケー
シング６を基台１と一体的な構成、つまり有底筒
状の構成とすることも可能である。要するに本考
案はその要旨を逸脱しない範囲で種種変形して実
施することができる。 Note that the present invention is not limited to the above embodiments. For example, the foreign matter shield 4 may be attached and fixed to the opening of the casing 6. It is also possible to configure the casing 6 integrally with the base 1, that is, to have a cylindrical configuration with a bottom. In short, the present invention can be implemented in various modifications without departing from its gist.
第１図は従来のガスセンサの構造を示す図、第
２図はガス検知素子の製法とその構造を示す図、
第３図は本考案の一実施例に係るガスセンサの構
造を示す図、第４図はガスセンサを用いたガス検
出装置の構成図、第５図は本考案に係るガスセン
サの感度特性変化を従来例のそれとと比較して示
す図である。
１……基台、２ａ，２ｂ……電極ピン、３……
ガス検知素子、４……異物遮蔽体、５……押え治
具、６……ケーシング（筒体）。
Figure 1 is a diagram showing the structure of a conventional gas sensor, Figure 2 is a diagram showing the manufacturing method of a gas detection element and its structure,
Fig. 3 is a diagram showing the structure of a gas sensor according to an embodiment of the present invention, Fig. 4 is a configuration diagram of a gas detection device using the gas sensor, and Fig. 5 is a conventional example showing changes in sensitivity characteristics of the gas sensor according to the present invention. FIG. 1... Base, 2a, 2b... Electrode pin, 3...
Gas detection element, 4... Foreign matter shield, 5... Holding jig, 6... Casing (cylindrical body).
Claims (1)
た２本の電極ピンと、これら電極ピンの一端間に
取付けられた接触燃焼型のガス検知素子と、一端
側が前記基台の縁部に固定されるとともに他端側
が上記ガス検知素子を囲むように延びて開口部を
１つしか持たないガス検知素子保温用の空間を形
成する筒状のケーシングと、このケーシングまた
は前記基台に固定されて前記ガス検知素子を覆つ
てなる異物遮蔽体とを具備してなることを特徴と
するガスセンサ。 An insulating base, two electrode pins inserted through this base, a catalytic combustion type gas detection element installed between one ends of these electrode pins, and one end of which is the edge of the base. a cylindrical casing whose other end extends to surround the gas sensing element and has only one opening to form a space for keeping the gas sensing element warm; and a cylindrical casing which is secured to the casing or the base; and a foreign matter shielding body covering the gas sensing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11586882U JPS5921755U (en) | 1982-07-30 | 1982-07-30 | gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11586882U JPS5921755U (en) | 1982-07-30 | 1982-07-30 | gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5921755U JPS5921755U (en) | 1984-02-09 |
| JPH0422288Y2 true JPH0422288Y2 (en) | 1992-05-21 |
Family
ID=30267320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11586882U Granted JPS5921755U (en) | 1982-07-30 | 1982-07-30 | gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5921755U (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133698U (en) * | 1977-03-29 | 1978-10-23 |
-
1982
- 1982-07-30 JP JP11586882U patent/JPS5921755U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5921755U (en) | 1984-02-09 |
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