JPS5917143A - Oxygen sensor - Google Patents
Oxygen sensorInfo
- Publication number
- JPS5917143A JPS5917143A JP57125902A JP12590282A JPS5917143A JP S5917143 A JPS5917143 A JP S5917143A JP 57125902 A JP57125902 A JP 57125902A JP 12590282 A JP12590282 A JP 12590282A JP S5917143 A JPS5917143 A JP S5917143A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- oxygen sensor
- diaphragm
- polaro
- porous
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、液体中の溶存酸素の量を測定する酸素セン
サに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an oxygen sensor that measures the amount of dissolved oxygen in a liquid.
酸素センサたとえばポーラロ式酸素センサは、液体中の
溶存酸素の謝を測定する装置であり、基礎化学、応用化
学の分野で酸素の分析に活用されるのみならず、臨床化
学検査の分野においても、多いに活用されている。臨床
化学検査の分野における活用の一例として、試別溶液た
とえばヒト血清中のグルコースをグルコースオキシダー
ゼの作用によシ酸化し、酸化によシ消費されたヒト血清
中の溶存酸素の量を前記ポーラロ式酸素センザで測定す
ることによシ、ヒト血清中のグルコース量ヲ分析し、医
療診断上の参考とすることが挙げられる。前記のような
臨床検査における分析は、試料液の微量化、高速化が特
に要求される。したがって、酸素上ンサ自体も小型であ
夛、かつ、その性能として応答速度が高いことが要求さ
れる。Oxygen sensors, such as the Polaro oxygen sensor, are devices that measure dissolved oxygen in liquids, and are used not only for oxygen analysis in the fields of basic chemistry and applied chemistry, but also in the field of clinical chemistry testing. It is widely used. As an example of application in the field of clinical chemistry testing, glucose in a sample solution, such as human serum, is oxidized by the action of glucose oxidase, and the amount of dissolved oxygen in human serum consumed by oxidation is calculated using the Polaro formula. By measuring with an oxygen sensor, the amount of glucose in human serum can be analyzed and used as a reference for medical diagnosis. Analysis in the above-mentioned clinical tests requires particularly small amounts of sample liquid and high speed. Therefore, the oxygen sensor itself is required to be small and numerous, and to have high response speed.
従来のポーラロ式酸素センサについて、第１図および第
２図を参照しながら説明する。第１図は従来のポーラロ
式酸素センザを示す一部断面図、および、第２図は従来
のポーラロ式酸素センザがら隔膜を除去した状態を示す
底面図である。A conventional Polaro oxygen sensor will be explained with reference to FIGS. 1 and 2. FIG. 1 is a partial sectional view showing a conventional Polaro oxygen sensor, and FIG. 2 is a bottom view showing the conventional Polaro oxygen sensor with the diaphragm removed.
同図に示すように、ポーラロ式酸素七ンサｌは、一端に
開口部を有する略円筒形の筐体２と、筺体２のほぼ中心
線に沿って円筒形の絶縁性保持部材３で保持されると共
にたとえばＡｕで形成された陰極４と、前記絶縁性保持
部材３の外周に保持されると共にたとえばＡｇ／ＡｇＣ
４で形成された陽イタ５と、筐体２内に充填された電解
質液たとえばＫＣ１内部液６と、筐体２の開口部に０リ
ングを介して装着されると共に、前記ＫＣ１内部液６を
封止し、かつ、陽極４の先端面に密着する隔膜たとえば
テフロン膜８とを具備し、試料液中に、前記テフロン膜
８を装着した筐体２の先端部を浸漬し、テフロン膜８を
透過し、てＫＣ１内部液６中に拡散する試料液中の酸素
を、陰極４および陽極５で生ずる以下の反応により流れ
る電荷量ｅ−を求めることによシ分析することができる
ように構成されている。As shown in the figure, the Polaro oxygen sensor 1 is held by a substantially cylindrical casing 2 having an opening at one end and a cylindrical insulating holding member 3 along the center line of the casing 2. and a cathode 4 made of, for example, Au, held on the outer periphery of the insulating holding member 3, and made of, for example, Ag/AgC.
4, an electrolyte solution filled in the casing 2, such as the KC1 internal liquid 6, and the KC1 internal liquid 6, which is attached to the opening of the casing 2 via an O-ring. It is equipped with a diaphragm, for example, a Teflon membrane 8, which is sealed and in close contact with the tip surface of the anode 4, and the tip of the casing 2, on which the Teflon membrane 8 is attached, is immersed in a sample solution, and the Teflon membrane 8 is removed. The oxygen in the sample liquid that permeates and diffuses into the internal liquid 6 of the KC1 can be analyzed by determining the amount of electric charge e- flowing due to the following reaction occurring at the cathode 4 and anode 5. ing.
陰極： Ｏ２−１−２Ｈ２０＋４８−＋ ４０Ｈ−陽極
： ４ Ａｇ ＋ ４ ＣＬ−−＋ ４ ＡｇＣ１＋４
ｅ−ところで、前記構成のポ〜ラロ式酸素七ンサ１に
おいて、応答速度に関与する要因は、隔膜（テフロン膜
）８の厚みと、電角Ｉｒ質液６中でのイオンの拡散速度
とである。Cathode: O2-1-2H20+48-+ 40H-Anode: 4 Ag + 4 CL--+ 4 AgC1+4
e-By the way, in the Polaro type oxygen analyzer 1 having the above configuration, the factors involved in the response speed are the thickness of the diaphragm (Teflon membrane) 8 and the diffusion rate of ions in the electromagnetic Ir liquid 6. be.
そこで、前記構成のポーラロ式酸素七ンサ１においては
、その隔膜（テフロン膜）８の厚みは１０〜２０μｍに
調製されていて、酸素分子の透過速度の向上を図り、応
答速度の改善が図られている。Therefore, in the polaro type oxygen analyzer 1 having the above structure, the thickness of the diaphragm (Teflon membrane) 8 is adjusted to 10 to 20 μm to improve the permeation rate of oxygen molecules and the response speed. ing.
しかしながら、電解質液６中でのイオンの拡散について
は、前記構成のポーラロ式酸素センサ１において、陰極
４を保持する絶縁性保持部材３の先端面に、第２図に示
すように、適宜の本数の凹状溝９を穿設することによっ
て、応答速度の向上を図ろうとしているのであるが、次
のような問題がある。すなわち、絶縁性保持部材３の先
端面に複数本の凹状溝９を、いずれの凹状溝９の形状も
同一となるように正確に穿設することが困難である。し
たがって、均一な品質のポーラロ式酸素十ンサ１を生産
することができないばかりか、小型のポーラロ式酸素七
ンサ１を製造しようとする場合、凹状溝９の穿設は至難
の技術となるから、コスト高となる。However, regarding the diffusion of ions in the electrolyte solution 6, in the Polaro oxygen sensor 1 having the above configuration, an appropriate number of wires are provided on the tip surface of the insulating holding member 3 that holds the cathode 4, as shown in FIG. An attempt has been made to improve the response speed by forming the concave groove 9, but the following problems arise. That is, it is difficult to accurately drill a plurality of concave grooves 9 in the distal end surface of the insulating holding member 3 so that the shapes of all concave grooves 9 are the same. Therefore, not only is it not possible to produce a Polaro type oxygen sensor 1 of uniform quality, but also when attempting to manufacture a small Polaro type oxygen sensor 1, drilling the concave groove 9 is an extremely difficult technique. The cost will be high.
この発明は、前記事情に鑑みてなされたものであシ、迅
速な応答性を有すると共に小型化可能な酸素センサを提
供することを目的とするものである。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an oxygen sensor that has quick response and can be miniaturized.
前記目的を達成するためのこの発明の概要は、筐体内に
陽極および陰極を有すると共に筐体開口部を隔膜で封じ
、筺体内に電１’／１質液を充填してなる酸素センサに
おいて、隔膜に接する陰極の先端外周に多孔質絶縁部材
を装着したことを特徴とする酸素センサ〜Ｘ〜である。To achieve the above object, the present invention provides an oxygen sensor which has an anode and a cathode in a housing, seals the opening of the housing with a diaphragm, and fills the housing with an electrolytic 1'/1 liquid, This is an oxygen sensor ~X~ characterized in that a porous insulating member is attached to the outer periphery of the tip of the cathode in contact with the diaphragm.
第３図はこの発明の一実施例を示−す一部所面図である
。FIG. 3 is a partial partial view showing an embodiment of the present invention.
この発明の一実施例である酸素センサたとえばポーラロ
式酸素七ンサは、第１図に示す従来のポーラロ式酸素セ
ンザとほぼ同様の構造を有しているので、以下において
は、従来のポーラロ式酸素センザとは異なる、この発明
の改良部分について説明する。An oxygen sensor such as a Polaro oxygen sensor, which is an embodiment of the present invention, has almost the same structure as the conventional Polaro oxygen sensor shown in FIG. The improved part of this invention that is different from the sensor will be explained.
この発明の一実施例であるポーラロ式酸累センザ１０は
、筐体２のほぼ中心軸に沿って配置される陰極４０の隔
膜８に接触している端面から所定長さまでたとえば１覇
までの陰極４０の周側面が露出するように陰極４０を絶
縁性保持部材３０で保持すると共に、前記陰極４０の露
出周側面にリング状の多孔質絶縁部材４０を嵌着して構
成されている。A polaro type acid accumulation sensor 10, which is an embodiment of the present invention, has a cathode 40 arranged approximately along the central axis of the casing 2, from the end surface in contact with the diaphragm 8 to a predetermined length, for example, up to 1 cm. The cathode 40 is held by an insulating holding member 30 so that the circumferential side of the cathode 40 is exposed, and a ring-shaped porous insulating member 40 is fitted onto the exposed circumferential side of the cathode 40.
前記多孔質絶縁部材４０の拐質としては、セラミック、
合成樹脂たとえばポリエチレン、テフロン等が挙げられ
る。特に、テフロンは耐薬品性に優れているので、好適
である。また、多孔質絶縁部材４０に用いる部材が本来
多孔質でない場合には、その部材にたとえばレーザ光線
で孔隙を形成し、多孔質部材としてもよい。The material of the porous insulating member 40 includes ceramic,
Examples of synthetic resins include polyethylene and Teflon. In particular, Teflon is suitable because it has excellent chemical resistance. Further, if the member used for the porous insulating member 40 is not originally porous, pores may be formed in the member using, for example, a laser beam to make the member porous.
また、多孔質絶縁部材４ｏにおける孔隙のメツシュとし
ては、たとえば約１０ミクロン〜３００ミクロン程度が
好ましい。３００ミクロンを越えると、多孔質絶縁部材
４０の強度が低下することがある。リング状の多孔質絶
縁部材４ｏのＪ９み（軸線方向での厚み）は、陰極端面
の面精にもよるがたとえば１＋ｍｎ程度でもよく、捷だ
、陰極４の周側面へ電解質液６が接触しないようにたと
えば陰極４の周側面に接着剤を介して多孔質絶縁部拐４
０を装着するのであるならば、前記厚みに限ることはな
い。Further, the mesh of pores in the porous insulating member 4o is preferably about 10 to 300 microns, for example. If it exceeds 300 microns, the strength of the porous insulating member 40 may decrease. The J9 thickness (thickness in the axial direction) of the ring-shaped porous insulating member 4o depends on the surface roughness of the cathode end surface, but may be about 1+mn, for example, so that the electrolyte solution 6 does not come into contact with the circumferential surface of the cathode 4. For example, a porous insulation layer 4 is attached to the circumferential surface of the cathode 4 with an adhesive.
0, the thickness is not limited to the above.
このように陰極４の先端外周に多孔質絶縁部材４０を嵌
着すると、多孔質絶縁部材４０の孔隙を通じて電′Ｍ質
液６中のイオンの、陰極４先端面への拡散を良好にする
仁とができ、応答性の改善を図ることができる。しかも
、多孔質絶縁部材４０の形状はきわめて簡単であるから
、多孔質絶縁部月４０自体の成型加工′ｆ：在易に行な
うことかで°き、製造コストの低減を図ることができる
。When the porous insulating member 40 is fitted around the outer periphery of the tip of the cathode 4 in this way, it is possible to improve the diffusion of ions in the electrolytic liquid 6 to the tip surface of the cathode 4 through the pores of the porous insulating member 40. This makes it possible to improve responsiveness. Moreover, since the shape of the porous insulating member 40 is extremely simple, the molding process of the porous insulating member 40 itself can be easily carried out, and manufacturing costs can be reduced.
なお、【０２図において、第１図に示すのと同じ酢号で
示す部拐は、従来の７」ヒーラロ式酸素センサ１に用い
られているのと同じである。In addition, in FIG. 02, the parts indicated by the same numbers as shown in FIG.
以上、この発明の一実施例について詳述したが、この発
明は前記実施例に限定されるものではなく、この発明の
要旨を変更しない範囲内で適宜に変形して実施すること
ができるのはいうまでもない。Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications within the scope of the gist of the invention. Needless to say.
この発明によると、陰極の先端部外周に装着した多孔ａ
絶縁部拐には微細な孔隙が無しに有るので、電解質液中
のイオンの拡散を良好とすることができ、応答性を改善
することができる。しかも、多孔質絶縁部材の形状を簡
単なリング状にすると多孔質絶縁部材を容易に製造する
ことができ、コストの低減を図ることができる。According to this invention, the porous a provided on the outer periphery of the tip of the cathode
Since there are no fine pores in the insulating part, it is possible to improve the diffusion of ions in the electrolyte solution and improve responsiveness. Furthermore, if the porous insulating member is formed into a simple ring shape, the porous insulating member can be easily manufactured, and costs can be reduced.
第１図は従来のポーラロ式酸素センサを示す一部断面図
、第２図は従来のポーラロ式酸累センザから隔膜を除去
した状態を示す底面図、および第３図はこの発明の一実
施例を示す一部断面図である。
２・・・筐体、４・・・陰極、５・・・陽極、８・・・
隔膜、６・・・電解質液、１０・・・ポーラロ式酸素セ
ンザ、４０・・・多孔質絶縁部材。FIG. 1 is a partial cross-sectional view of a conventional Polaro oxygen sensor, FIG. 2 is a bottom view of the conventional Polaro oxygen sensor with the diaphragm removed, and FIG. 3 is an embodiment of the present invention. FIG. 2... Housing, 4... Cathode, 5... Anode, 8...
Diaphragm, 6... Electrolyte solution, 10... Polaro oxygen sensor, 40... Porous insulating member.
Claims (1)
膜で封じ、筐体内に電解質液を充填してなる酸素センサ
において、隔膜に接する陰極の先端外周に多孔質絶縁部
材を装着したことを特徴とする酸素センサ。An oxygen sensor having an anode and a cathode inside a housing, an opening of the housing sealed with a diaphragm, and an electrolyte solution filled in the housing, characterized in that a porous insulating member is attached to the outer periphery of the tip of the cathode in contact with the diaphragm. Oxygen sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57125902A JPS5917143A (en) | 1982-07-21 | 1982-07-21 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57125902A JPS5917143A (en) | 1982-07-21 | 1982-07-21 | Oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5917143A true JPS5917143A (en) | 1984-01-28 |
Family
ID=14921730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57125902A Pending JPS5917143A (en) | 1982-07-21 | 1982-07-21 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5917143A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163944A (en) * | 1985-01-16 | 1986-07-24 | Daikin Ind Ltd | Diaphragm |
| JPH0257960A (en) * | 1988-08-23 | 1990-02-27 | Tokuyama Soda Co Ltd | Oxygen electrode |
| JPH02142808A (en) * | 1988-11-22 | 1990-05-31 | Hitachi Chem Co Ltd | Resin composition |
| US5356659A (en) * | 1986-07-31 | 1994-10-18 | At&T Bell Laboratories | Metallization for semiconductor devices |
-
1982
- 1982-07-21 JP JP57125902A patent/JPS5917143A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163944A (en) * | 1985-01-16 | 1986-07-24 | Daikin Ind Ltd | Diaphragm |
| JPH047382B2 (en) * | 1985-01-16 | 1992-02-10 | Daikin Ind Ltd | |
| US5356659A (en) * | 1986-07-31 | 1994-10-18 | At&T Bell Laboratories | Metallization for semiconductor devices |
| JPH0257960A (en) * | 1988-08-23 | 1990-02-27 | Tokuyama Soda Co Ltd | Oxygen electrode |
| JPH02142808A (en) * | 1988-11-22 | 1990-05-31 | Hitachi Chem Co Ltd | Resin composition |
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