JPS58196451A - Oxygen concentration measuring apparatus - Google Patents
Oxygen concentration measuring apparatusInfo
- Publication number
- JPS58196451A JPS58196451A JP57079191A JP7919182A JPS58196451A JP S58196451 A JPS58196451 A JP S58196451A JP 57079191 A JP57079191 A JP 57079191A JP 7919182 A JP7919182 A JP 7919182A JP S58196451 A JPS58196451 A JP S58196451A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- galvanic
- oxygen
- concentration
- 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.)
- Granted
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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
または酸素と他の気体の混合物中の酸素濃度を測定する
だめの測定器の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The invention also relates to improvements in measuring instruments for measuring oxygen concentration in mixtures of oxygen and other gases.
従来、酸素濃度を測定する方式として隔膜型ガルバニ電
池が比較的簡単で取り扱い易いものとして一般に使用さ
れてきている。この方式はＫＯＨ（野性カリ）液等から
なる電解液が満たされた、一端面がテフロン等の酸素通
過性を有する隔膜によシ構成された筐体内部に、Ａｇあ
るいはｐｔからなる陽極とｐｂあるいはＣｄよりなる陰
極を浸したガルバニ電池よシ成り立っており、被測定気
体中より前記隔膜を透過し内部に拡散する酸素濃度が、
電池の発生電流と比例する効果を利用して測定するもの
である。Conventionally, a diaphragm type galvanic cell has been generally used as a method for measuring oxygen concentration because it is relatively simple and easy to handle. In this method, an anode made of Ag or PT and a PB Alternatively, it consists of a galvanic cell in which a cathode made of Cd is immersed, and the oxygen concentration that permeates the diaphragm and diffuses into the inside from the gas to be measured is
It is measured using an effect that is proportional to the current generated by the battery.
しかしこの方式は温度変化による測定結果の変化が大き
く、また長期間にわたる測定値のパラツキが大であり、
安定性が保証できない欠点があった。この理由としては
温度等の環境変化による隔膜と陰極間の密着度変化、隔
膜の酸素透過係数の変化あるいは電解液の変質、電極面
の変化管種々の要因が挙げられている。However, with this method, the measurement results vary greatly due to temperature changes, and the measurement values vary widely over a long period of time.
There was a drawback that stability could not be guaranteed. Reasons for this include changes in the degree of adhesion between the diaphragm and cathode due to environmental changes such as temperature, changes in the oxygen permeability coefficient of the diaphragm, changes in the quality of the electrolyte, changes in the electrode surface, and various other factors.
この対策として一般には、サーミスタ等の温度検出素子
を用いて測定値の補償を行につたり、定期的に電解液お
よび電極交換を実施して、測定値精度の長期間にわたる
安定を保っていた。To counter this, the measurement accuracy is generally maintained over a long period of time by compensating the measured values using a temperature detection element such as a thermistor, and periodically replacing the electrolyte and electrodes. .
そこで本発明者等は長期間にわたる測定値の安定化につ
いて鋭意研究を重ねた結果、ガルバニ電池を比較的低温
に保つことにより測定値の再現性が秀れ、長期間にわた
る安定性が向上することを見出した。As a result of intensive research into stabilizing measured values over long periods of time, the inventors of the present invention have found that by keeping the galvanic cell at a relatively low temperature, the reproducibility of measured values is excellent and stability over long periods of time is improved. I found out.
本発明はこの点にもとづいてなされたものであり、ガル
バニ電池および被測定気体を比較的低温に保つことによ
シ、測定値の再現性に優れかつ長期間安定した酸素濃度
表示の得られる、電池交換頻度の少ないガルバニ型酸素
濃度測定器を提供することを目的としたものである。The present invention has been made based on this point, and by keeping the galvanic cell and the gas to be measured at a relatively low temperature, it is possible to obtain an oxygen concentration display that has excellent reproducibility of measured values and is stable over a long period of time. The purpose of this invention is to provide a galvanic oxygen concentration meter that requires less frequent battery replacement.
次に図面及びグラフを参照しながら本発明について詳細
に説明してゆく。Next, the present invention will be explained in detail with reference to the drawings and graphs.
第１図はガルバニ型酸素センサーの概略断面図を示して
いる。ＫＯＨ（野性カリ）等の電解液１４中に陽極１５
、陰極１１が浸っていて、両極間には固定抵抗あるいは
センサーの温度補償をするためサーミスタからなる検出
抵抗１６が接続されていて、隔膜１２を通して電解液内
部に拡散してくる酸素濃度に比例して発生する電流を検
出する。FIG. 1 shows a schematic cross-sectional view of a galvanic oxygen sensor. Anode 15 in electrolyte 14 such as KOH (wild potash)
, a cathode 11 is immersed in the electrolyte, and a detection resistor 16 consisting of a fixed resistor or a thermistor is connected between the two electrodes to compensate for the temperature of the sensor. Detects the current generated by
第２図は酸素濃度検出回路の概略図である。検出抵抗１
６の両端電圧がセンスアンプ２２で増巾され表示装置３
３で酸素濃度表示が表される。FIG. 2 is a schematic diagram of the oxygen concentration detection circuit. Detection resistor 1
6 is amplified by the sense amplifier 22 and displayed on the display device 3.
3 indicates the oxygen concentration display.
次に第３図はガルバニ型酸素センサーを定温度、定酸素
濃度下で長期間出力電圧を測定した実験結果を示すグラ
フである。Next, FIG. 3 is a graph showing the results of an experiment in which the output voltage of a galvanic oxygen sensor was measured for a long period of time under constant temperature and constant oxygen concentration.
図中横軸は経過時間（単位は日）、縦軸は発生電圧（単
位はｍｖ）で目盛ってあり、測定結果のバラツキ幅は周
囲温度４０℃では約６．ｍＶ、 ’２０℃においては約
３ ｍＶ、１０℃においては約１ ｍＶが測定され、低
温化するにつれて発生電圧の絶対値の減少がみられるが
、その割合以上の大幅なバラツキ幅の減少効果を見出す
ことができる。In the figure, the horizontal axis is scaled with elapsed time (unit: days), and the vertical axis is scaled with generated voltage (unit: mv), and the variation width of the measurement results is approximately 6.5 mm at an ambient temperature of 40°C. mV, about 3 mV at 20°C and about 1 mV at 10°C, and the absolute value of the generated voltage decreases as the temperature decreases. can be found.
使用温度領域としては、酸素濃度計及び酸素濃度警報計
に関するＪＩＳ規格（ＪＩＳ Ｔ８２０１ ）による要
求精度を満たすためほぼ２０℃以下にする必要があり、
一方ＫＯＨ溶液の一規定度のものは凍結温度が−３，７
２℃であることからほぼ一３℃以上の温度に保たねばな
ら々い。次に本発明の一実施例について説明する。The operating temperature range must be approximately 20°C or below in order to meet the accuracy required by the JIS standard (JIS T8201) for oxygen concentration meters and oxygen concentration alarm meters.
On the other hand, the freezing temperature of KOH solution with 1 normality is -3.7
Since the temperature is 2 degrees Celsius, it is necessary to keep the temperature at about 13 degrees Celsius or higher. Next, one embodiment of the present invention will be described.
第４図はガルバニ電池を上記温度領域に保つことを目的
として断熱材によシ構成され、かつ被検知気体の通気孔
としての役割をはたす開口部を一端部に有した酸素濃度
測定器の概略断面図であり、内部にはガルバニ電池４１
が収納されている。恒温槽の冷却方式としては、小型化
、長寿命化の点から例えば電子冷却が望ましく、本装置
では冷却素子４２にベルチェ素子を採用し周囲温度に対
応して恒温槽から吸熱し、放熱を放熱器４３で行なうＯ
またガルバニ電池および被検知気体を冷却することによ
り被検知気体の相対湿度が増加し、隔膜から電解液中の
水分蒸発が減少するため、電解液の補充交換回数が少な
くなる効果も得ることができる。Figure 4 is a schematic diagram of an oxygen concentration measuring device that is constructed of a heat insulating material for the purpose of keeping the galvanic cell within the above temperature range, and has an opening at one end that serves as a vent for the gas to be detected. It is a sectional view, and there is a galvanic battery 41 inside.
is stored. For example, electronic cooling is preferable as a cooling method for a thermostatic chamber in terms of miniaturization and long life.In this device, a Beltier element is used as the cooling element 42, and heat is absorbed from the thermostatic chamber according to the ambient temperature, and heat is radiated. In addition, by cooling the galvanic cell and the gas to be detected, the relative humidity of the gas to be detected increases, and the evaporation of water in the electrolyte from the diaphragm is reduced, which has the effect of reducing the number of times the electrolyte needs to be replenished and replaced. You can also get
以上述べたように本発明によれば、ガルバニ電池を一端
部に開口部を有する恒温槽内に収納し、はぼ２０℃〜−
３℃の温度領域内の一定温度に冷却して使用するため、
発生電圧が長期にわたり安定化し精度の良い酸素濃度測
定が可能となり、かつガルバニ電池も長寿命化したため
従来実現されなかった実用上非常に有用なガルバニ型酸
素濃度測定器を提供することが可能となったものである
０As described above, according to the present invention, a galvanic cell is housed in a constant temperature bath having an opening at one end, and the temperature range is from 20°C to -
Because it is used after being cooled to a constant temperature within the 3℃ temperature range,
The generated voltage is stabilized over a long period of time, making it possible to measure oxygen concentration with high accuracy, and the galvanic battery has a longer lifespan, making it possible to provide a galvanic type oxygen concentration measuring device that is extremely useful in practice, which was not possible before. 0
第１図はガルバニ型酸素センサーの概略断面図、第２図
は酸素濃度検出回路の概略図、第４図は酸素濃度測定装
置の概略断面図、第３図は長期間にわたる測定結果を示
すグラフである。
図中、１１・・・陰極、１２・・・隔膜、１５・・・陽
極、４４・・・恒温槽、４１・・・ガルバニ電池、４２
・・・冷却素子、４３・・・放熱器、４５・・・金属ケ
ース。
出願人 藤倉電線株式会社
代理人 弁理士竹内 守Figure 1 is a schematic sectional view of a galvanic oxygen sensor, Figure 2 is a schematic diagram of an oxygen concentration detection circuit, Figure 4 is a schematic sectional view of an oxygen concentration measuring device, and Figure 3 is a graph showing long-term measurement results. It is. In the figure, 11...Cathode, 12...Diaphragm, 15...Anode, 44...Thermostat, 41...Galvanic cell, 42
...Cooling element, 43... Heatsink, 45... Metal case. Applicant Fujikura Electric Cable Co., Ltd. Agent Patent Attorney Mamoru Takeuchi
Claims (2)
る恒温槽にガルバニ電池が収容され、さらにこの恒温槽
に放熱器が取付けられ、前記ガルバニ電池及び被検知気
体がほぼ２０℃以下から一３℃以上の温度領域内の一定
温度に保持されるように構成されたことを特徴とするガ
ルバニ型酸素濃度測定器。(1) A galvanic cell is housed in a constant temperature bath made of a heat insulating material and has an opening at one end, and a radiator is attached to this constant temperature bath, so that the galvanic cell and the gas to be detected are heated from approximately 20°C or below. A galvanic oxygen concentration measuring device characterized in that it is configured to maintain a constant temperature within a temperature range of 3° C. or higher.
する特許請求の範囲第１項記載のガルバニ型酸素濃度測
定器。(2) The galvanic oxygen concentration measuring device according to claim 1, wherein the cooling element is a wave lutier element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57079191A JPS58196451A (en) | 1982-05-13 | 1982-05-13 | Oxygen concentration measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57079191A JPS58196451A (en) | 1982-05-13 | 1982-05-13 | Oxygen concentration measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58196451A true JPS58196451A (en) | 1983-11-15 |
| JPH0324621B2 JPH0324621B2 (en) | 1991-04-03 |
Family
ID=13683080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57079191A Granted JPS58196451A (en) | 1982-05-13 | 1982-05-13 | Oxygen concentration measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58196451A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60128346A (en) * | 1983-12-16 | 1985-07-09 | Toshiba Corp | Measuring device for ion concentration |
| JPH01217263A (en) * | 1988-02-26 | 1989-08-30 | Showa Denko Kk | Analysis of catechol amine and/or metabolic matter and electrochemical detector |
| JPH0593259U (en) * | 1992-05-27 | 1993-12-21 | 株式会社アイティーオー | desk |
| JP6006465B1 (en) * | 2015-07-21 | 2016-10-12 | オリンパス株式会社 | Concentration measuring device and endoscope reprocessor |
| WO2017013905A1 (en) * | 2015-07-21 | 2017-01-26 | オリンパス株式会社 | Concentration measurement device and endoscope reprocessor |
| DE102020130289A1 (en) | 2020-11-17 | 2022-05-19 | Dräger Safety AG & Co. KGaA | Storage device for storing a gas detector, system of storage device and gas detector and method of storing the gas detector |
-
1982
- 1982-05-13 JP JP57079191A patent/JPS58196451A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60128346A (en) * | 1983-12-16 | 1985-07-09 | Toshiba Corp | Measuring device for ion concentration |
| JPH01217263A (en) * | 1988-02-26 | 1989-08-30 | Showa Denko Kk | Analysis of catechol amine and/or metabolic matter and electrochemical detector |
| JPH0593259U (en) * | 1992-05-27 | 1993-12-21 | 株式会社アイティーオー | desk |
| JP6006465B1 (en) * | 2015-07-21 | 2016-10-12 | オリンパス株式会社 | Concentration measuring device and endoscope reprocessor |
| WO2017013905A1 (en) * | 2015-07-21 | 2017-01-26 | オリンパス株式会社 | Concentration measurement device and endoscope reprocessor |
| DE102020130289A1 (en) | 2020-11-17 | 2022-05-19 | Dräger Safety AG & Co. KGaA | Storage device for storing a gas detector, system of storage device and gas detector and method of storing the gas detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0324621B2 (en) | 1991-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Severinghaus et al. | Electrodes for blood pO2 and pCO2 determination | |
| US6176988B1 (en) | Membrane electrode for measuring the glucose concentration in fluids | |
| EP0035400A1 (en) | Apparatus and method for measuring the partial pressure of a gas | |
| US3272725A (en) | Method of electrolytically testing oxygen concentration | |
| US3045665A (en) | Instrument for maintaining constant oxygen partial pressure and measuring oxygen consumption | |
| US3598711A (en) | Electrochemical oxygen analyzer | |
| Vielstich et al. | Voltage-step method for the kinetic study of fast electrode reactions | |
| EP0153830A1 (en) | Engine air/fuel ratio sensing device | |
| US4650562A (en) | Reference electrode device | |
| US4301807A (en) | Apparatus and method for temperature compensated transcutaneous carbon dioxide measurement | |
| JPS58196451A (en) | Oxygen concentration measuring apparatus | |
| US4182666A (en) | Oxygen sensors | |
| Lucero | Design of membrane-covered polarographic gas detectors | |
| US3522732A (en) | Sensing element for hygrometers | |
| JPS61112956A (en) | Oxygen sensor with residual life indicator | |
| JP5320324B2 (en) | Gas detector | |
| US4168220A (en) | Method for detecting the fouling of a membrane covered electrochemical cell | |
| US4065371A (en) | Electrochemical carbon meter | |
| US3429784A (en) | Method and apparatus for measuring gas content | |
| US3917524A (en) | Electrochemical cell assembly | |
| JPH11326279A (en) | Automatic measuring apparatus for concentration of developer | |
| EP0108141A1 (en) | Oxygen analyzer | |
| JP7348096B2 (en) | Gas concentration measuring device | |
| RU189631U1 (en) | Sensor for measuring the concentration of oxygen and hydrogen in inert, protective and oxidizing gas mixtures | |
| WO1985000659A1 (en) | Measuring an extended range of air fuel ratio |