JPS6236172B2 - - Google Patents
Info
- Publication number
- JPS6236172B2 JPS6236172B2 JP56156570A JP15657081A JPS6236172B2 JP S6236172 B2 JPS6236172 B2 JP S6236172B2 JP 56156570 A JP56156570 A JP 56156570A JP 15657081 A JP15657081 A JP 15657081A JP S6236172 B2 JPS6236172 B2 JP S6236172B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- electrode
- permeable membrane
- solution conductivity
- gas permeable
- 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
- 239000012528 membrane Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 11
- 229920001600 hydrophobic polymer Polymers 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 239000000908 ammonium hydroxide Substances 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】
この発明は溶液導電率測定用電極を用いて構成
するガス濃度測定用電極に関し、さらに詳しく
は、溶液導電率測定用電極を覆うようにガス透過
性膜を設けるとともに、この電極とガス透過性膜
との間にガス吸収液を充填してなる溶液導電率型
ガス濃度測定用電極に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode for measuring gas concentration constructed using an electrode for measuring solution conductivity, and more specifically, a gas permeable membrane is provided to cover the electrode for measuring solution conductivity, and The present invention relates to a solution conductivity type gas concentration measuring electrode in which a gas absorbing liquid is filled between the electrode and the gas permeable membrane.
従来、PH電極にガス透過性膜をかぶせ、このガ
ス透過性膜を通過してくるガスをガス吸収液に吸
収させ、この吸収液のPH変化をPH電極にて電位差
変化として促え、これよりガス濃度を測定する方
法があつた。しかしながら、この方法において
は、測定される電位差とガス濃度とが対数関係に
ある為、電位差からガス濃度を求めるには逆対数
変換器を必要とする。また、用いるPH電極の内部
抵抗が大きいため（一般的に100MΩ以上）高入
力抵抗の増幅器が必要である等装置が複雑とな
り、測定に手間がかかるとともにコスト高にな
る。装置全体として複雑となるので取扱いに注意
を要し、とくに高入力抵抗増幅機であるための絶
縁低下等取扱いに注意を必要とするものであつ
た。 Conventionally, a PH electrode was covered with a gas permeable membrane, the gas passing through the gas permeable membrane was absorbed into a gas absorption liquid, and the PH change in the absorption liquid was promoted as a potential difference change at the PH electrode. There was a way to measure gas concentration. However, in this method, since the measured potential difference and gas concentration have a logarithmic relationship, an anti-logarithmic converter is required to determine the gas concentration from the potential difference. Furthermore, since the internal resistance of the PH electrode used is large (generally 100 MΩ or more), the equipment becomes complicated, such as requiring an amplifier with a high input resistance, making the measurement time-consuming and costly. Since the device as a whole is complicated, care must be taken when handling it, and in particular, because it is a high input resistance amplifier, the insulation may deteriorate.
この発明は上記の従来法の欠点を解消するべく
なされたもので、溶液導電率測定用電極を用いて
ガス濃度を測定しようとするものである。 This invention was made to eliminate the drawbacks of the above-mentioned conventional methods, and aims to measure gas concentration using an electrode for measuring solution conductivity.
以下この発明を実施例に基づいて詳述するもの
であるが、この発明は下記実施例に限定されるも
のではない。 This invention will be described in detail below based on Examples, but this invention is not limited to the Examples below.
第１図はこの発明の溶液導電率型ガス濃度測定
用電極１を示すもので、溶液導電率測定用電極２
を覆うようにガス透過性膜３が設けられて構成さ
れている。溶液導電率測定用電極２は、極板４，
４と、この極板４，４を埋設して支持する支持管
５と、リード線６，６とからなるもので、従来の
溶液導電率測定用電極においては極板を支持管よ
り突出させて支持していたのに対し、支持管５面
と下端部が面一となるように極板４，４を設けて
いる。これはガス透過性膜３が納まりよく、支持
管５との間に適当な空隙を作るように設けられる
べく配慮したものである。ガス透過性膜３として
は２μ〜100μ厚程度のテフロン、ポリプロピレ
ン、シリコーン等の疎水性高分子膜が用いられ、
ガス吸収液の充填は実際にはこのガス透過性膜３
の内面に滴下しておこなわれるもので、ガス透過
性膜３はＯリング７により支持管５に取り付けら
れる。この取り付けの際ガス透過性膜３のガス吸
収液部分の厚みが２μ〜10μ程度に保たれるよう
にするものである。 FIG. 1 shows a solution conductivity type gas concentration measuring electrode 1 of the present invention, and a solution conductivity measuring electrode 2.
A gas permeable membrane 3 is provided to cover the gas permeable membrane 3. The electrode 2 for measuring solution conductivity includes an electrode plate 4,
4, a support tube 5 that supports the electrode plates 4, 4 by burying them, and lead wires 6, 6. In conventional solution conductivity measurement electrodes, the electrode plates are made to protrude from the support tube. However, the electrode plates 4, 4 are provided so that the support tube 5 surface and the lower end portion are flush with each other. This is done so that the gas permeable membrane 3 can be accommodated well and an appropriate gap can be created between the gas permeable membrane 3 and the support tube 5. As the gas permeable membrane 3, a hydrophobic polymer membrane such as Teflon, polypropylene, silicone, etc. with a thickness of about 2μ to 100μ is used.
The gas absorption liquid is actually filled in this gas permeable membrane 3.
The gas permeable membrane 3 is attached to the support tube 5 with an O-ring 7. During this installation, the thickness of the gas-absorbing liquid portion of the gas-permeable membrane 3 is kept at about 2 to 10 microns.
以下この発明の実施例を使用しておこなうアン
モニヤガス濃度測定について示す。 The measurement of ammonia gas concentration using an embodiment of the present invention will be described below.
ガス吸収液としては塩化アンモニウム水溶液を
用いるもので、ガス透過膜を透過したアンモニヤ
ガスは塩化アンモニウム水溶液と次式のように反
応し、水酸化アンモニウム（NH4 OH）を生成し
平衡状態となる。 An ammonium chloride aqueous solution is used as the gas absorption liquid, and the ammonia gas that has passed through the gas permeable membrane reacts with the ammonium chloride aqueous solution as shown in the following equation, producing ammonium hydroxide (NH 4 OH) and reaching an equilibrium state.
NH3＋NH4Cl＋H2ONH4Cl＋NH4OH
生成する水酸化アンモニウム量は被測定ガスで
あるアンモニヤガス濃度に可逆的に比例する。す
なわち、アンモニヤガス濃度が大であれば生成さ
れる水酸化アンモニウムの量も多くなり、アンモ
ニヤガス濃度が小であれば水酸化アンモニウムの
量も少なくなる。 NH 3 +NH 4 Cl + H 2 ONH 4 Cl + NH 4 OH The amount of ammonium hydroxide generated is reversibly proportional to the concentration of ammonia gas, which is the gas to be measured. That is, if the ammonia gas concentration is high, the amount of ammonium hydroxide produced will be large, and if the ammonia gas concentration is low, the amount of ammonium hydroxide produced will also be small.
一方溶液導電率電極で測定されるガス吸収液の
溶液電導率（）は次式で示されるように生成さ
れる水酸化アンモニウムの量に比例する。 On the other hand, the solution conductivity ( ) of the gas-absorbing liquid measured with a solution conductivity electrode is proportional to the amount of ammonium hydroxide produced as shown by the following equation.
＝KNH4Cl・CNH4Cl＋KNH4CH・CNH4OH
（KNH4Cl：NH4Clのイオン価と移動度の積で表
わされる定数
KNH4OH：NH4OHのイオン価と移動度の積で
表わされる定数
CNH4Cl：NH4Clの濃度
CNH4OH：生成されるNH4OHの濃度）
従がつてガス吸収液の溶液導電率変化を測定す
ることによつて被測定ガスであるアンモニヤガス
濃度を求めることができるものである。 = KNH 4 Cl・CNH 4 Cl + KNH 4 CH・CNH 4 OH (KNH 4 Cl: Constant expressed as the product of the ion valence and mobility of NH 4 Cl KNH 4 OH: The constant expressed as the product of the ion valence and mobility of NH 4 OH Constants represented: CNH 4 Cl: Concentration of NH 4 Cl CNH 4 OH: Concentration of generated NH 4 OH) Therefore, by measuring the change in solution conductivity of the gas absorption liquid, ammonia gas, which is the gas to be measured, can be measured. It is possible to determine the concentration.
ガス吸収液としてはガス吸収に伴なう溶液導電
率変化の大きい溶液を、測定ガスに対応させて適
宜選択して用いるもので、アンモニヤガスの場合
は上記塩化アンモニウム水溶液の他に炭酸水素ナ
トリウム水溶液を用い、炭酸ガスの場合は炭酸水
素ナトリウム水溶液を用いる。 As the gas absorption liquid, a solution with a large change in solution conductivity due to gas absorption is selected and used as appropriate depending on the measurement gas.In the case of ammonia gas, in addition to the above ammonium chloride aqueous solution, a sodium bicarbonate aqueous solution is used. In the case of carbon dioxide gas, use an aqueous sodium bicarbonate solution.
第１図に示した実施例においては極板を２個用
いたものを示したが、溶液導電率測定用電極には
極板が３個のもの４個のものがあるので、この発
明においてもそれらの使用が可能である。 Although the embodiment shown in FIG. 1 uses two electrode plates, there are other types of electrodes for measuring solution conductivity, one with three plates and the other with four plates, so this invention also applies. Their use is possible.
この発明は上述のように構成されているもの
で、この発明によれば溶液導電率より直線関係に
おいてガス濃度が得られるので逆対数変換器を用
いる必要がなく、また内部抵抗も大とならないの
で増幅器も必要とせず、全体構成が簡単となり取
り扱いが容易になるとともにコスト安に提供でき
るものである。さらにこの発明を溶液の導電率測
定に用いた場合、ガス体のみに感応するので共存
の液体成分の妨害が少なく、選択性のある測定が
可能になるという付加的効果も発揮するものであ
る。 This invention is constructed as described above. According to this invention, the gas concentration can be obtained in a linear relationship from the solution conductivity, so there is no need to use an anti-logarithm converter, and the internal resistance does not become large. Since no amplifier is required, the overall configuration is simple, easy to handle, and can be provided at low cost. Furthermore, when this invention is used to measure the conductivity of a solution, it has the additional effect of being sensitive only to gaseous bodies, resulting in less interference from coexisting liquid components and enabling selective measurement.
第１図はこの発明の実施例の一部切欠断面図で
ある。
１……溶液導電率型ガス濃度測定用電極、２…
…溶液導電率測定用電極、３……ガス透過性膜。
FIG. 1 is a partially cutaway sectional view of an embodiment of the invention. 1... Electrode for solution conductivity type gas concentration measurement, 2...
... Electrode for measuring solution conductivity, 3... Gas permeable membrane.
Claims (1)
の先端部と面一になるように埋設構成し、この先
端部を厚さ２μ〜100μの疎水性高分子膜からな
るガス透過性膜で覆うと共に、この先端部とガス
透過性膜との間にガス吸収液を充填してなる溶液
導電率型ガス濃度測定用電極。1. At least one pair of electrode plates is embedded in the tip of the support tube so that it is flush with the tip, and this tip is covered with a gas permeable membrane made of a hydrophobic polymer membrane with a thickness of 2μ to 100μ. In addition, a solution conductivity type gas concentration measuring electrode is formed by filling a gas absorbing liquid between the tip portion and the gas permeable membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15657081A JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15657081A JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858457A JPS5858457A (en) | 1983-04-07 |
| JPS6236172B2 true JPS6236172B2 (en) | 1987-08-05 |
Family
ID=15630654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15657081A Granted JPS5858457A (en) | 1981-09-30 | 1981-09-30 | Measuring electrode for ionic activity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858457A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2691418B2 (en) * | 1988-06-08 | 1997-12-17 | 株式会社加藤精工所 | Knot structure of fishing net, its braiding method and its braiding device |
| GB9815667D0 (en) | 1998-07-17 | 1998-09-16 | Medinnova Sf | Device |
| BRPI0513428B8 (en) | 2004-07-16 | 2021-07-27 | Alertis Medical As | physiological detection device for measuring pco2 |
| JP6213906B2 (en) * | 2012-06-22 | 2017-10-18 | オムロン株式会社 | Gas sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098396A (en) * | 1973-12-21 | 1975-08-05 |
-
1981
- 1981-09-30 JP JP15657081A patent/JPS5858457A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5098396A (en) * | 1973-12-21 | 1975-08-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5858457A (en) | 1983-04-07 |
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