JPH02189453A - Oxygen concentration measuring instrument - Google Patents
Oxygen concentration measuring instrumentInfo
- Publication number
- JPH02189453A JPH02189453A JP1009173A JP917389A JPH02189453A JP H02189453 A JPH02189453 A JP H02189453A JP 1009173 A JP1009173 A JP 1009173A JP 917389 A JP917389 A JP 917389A JP H02189453 A JPH02189453 A JP H02189453A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- pressure
- sensor
- oxygen concentration
- signal
- 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
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 69
- 239000001301 oxygen Substances 0.000 title claims abstract description 69
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000008151 electrolyte solution Substances 0.000 abstract description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- -1 polyfluoroethylene Polymers 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、測定する系の圧力の影響を受けることなく相
対酸素濃度を測定できるようにした酸素濃度測定器に関
する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an oxygen concentration measuring device that can measure relative oxygen concentration without being affected by the pressure of a measuring system.
「従来の技術」
従来、環境監視システム等で行われる酸素濃度の測定は
、低消費電力でかつ構成が簡単で小型なガルバニ電池式
酸素セン、すと電圧計等とよりなる測定器により行われ
ていた。"Conventional Technology" Conventionally, oxygen concentration measurements in environmental monitoring systems, etc. have been carried out using low power consumption, simple and compact measuring instruments such as galvanic cell-type oxygen sensors and voltmeters. was.
ガルバニ電池式酸素センサは、アノードと隔膜が取り付
けられたカソードと電解液とから概略構成され、隔膜を
透過した酸素がカソード表面で還元されて起こる電池反
応により流れる電流が酸素分圧に比例することを利用し
て、雰囲気の酸素分圧に比例した信号（電圧等）を出力
するものである。A galvanic cell type oxygen sensor generally consists of an anode, a cathode with a diaphragm attached, and an electrolyte. Oxygen that has passed through the diaphragm is reduced on the cathode surface, resulting in a battery reaction that causes the current flowing to be proportional to the oxygen partial pressure. It outputs a signal (voltage, etc.) proportional to the oxygen partial pressure in the atmosphere.
そして、従来このガルバニ電池式酸素センサの信号を電
圧計等により読み取ることにより酸素濃度を測定してい
た。Conventionally, the oxygen concentration has been measured by reading the signal from this galvanic cell type oxygen sensor using a voltmeter or the like.
［発明が解決しようとする課題」
ところが、上述のようにガルバニ電池式酸素センサの出
力信号は雰囲気の酸素分圧に比例したものであるため、
酸素濃度が同じでも雰囲気の圧力（全圧）により電圧計
等の指示値が異なり、上記のような゛測定器を用いた場
合には、測定の度に圧力補正のための校正を行う必要が
あった。このことは、下記のような不具合をもたらして
いた。[Problem to be solved by the invention] However, as mentioned above, the output signal of the galvanic cell type oxygen sensor is proportional to the oxygen partial pressure in the atmosphere.
Even if the oxygen concentration is the same, the readings of a voltmeter, etc. will vary depending on the atmospheric pressure (total pressure), and when using a measuring device like the one above, it is necessary to calibrate the pressure to correct it every time you make a measurement. there were. This caused the following problems.
（ａ）測定作業に手間がかかる。(a) Measurement work is time-consuming.
（ｂ）リアルタイムで測定することができない。(b) It cannot be measured in real time.
本発明は上記従来の問題点に鑑みなされたものであって
、圧力の影響を受けることなく相対酸素濃度が測定可能
な酸素濃度測定器を提供することを目的としている。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an oxygen concentration measuring device capable of measuring relative oxygen concentration without being affected by pressure.
「課題を解決するための手段」
本発明の酸素濃度測定器は、雰囲気の酸素分圧に比例し
た信号を出力する酸素センサと、雰囲気の全圧に比例し
た信号を出力する圧力センサと、前記酸素センサと前記
圧力センサの信号により雰囲気の相対酸素濃度を演算し
、この値に応じた信号を出力する測定器本体とを具備し
てなることを特徴としている。"Means for Solving the Problems" The oxygen concentration measuring device of the present invention comprises: an oxygen sensor that outputs a signal proportional to the partial pressure of oxygen in the atmosphere; a pressure sensor that outputs a signal proportional to the total pressure of the atmosphere; It is characterized by comprising an oxygen sensor and a measuring device main body that calculates the relative oxygen concentration of the atmosphere based on the signal from the pressure sensor and outputs a signal according to this value.
「作用」
本発明の酸素濃度測定器において、酸素センサは、雰囲
気の酸素分圧に比例した信号を出力する。"Operation" In the oxygen concentration measuring device of the present invention, the oxygen sensor outputs a signal proportional to the oxygen partial pressure of the atmosphere.
また、圧力センサは雰囲気の全圧に比例した信号を出力
する。そして、測定器本体は前記酸素センサと前記圧力
センサの信号により雰囲気の相対酸素濃度を演算し、こ
の値を表示するかこの値に応じた信号を出力する。Moreover, the pressure sensor outputs a signal proportional to the total pressure of the atmosphere. Then, the main body of the measuring device calculates the relative oxygen concentration of the atmosphere based on the signals from the oxygen sensor and the pressure sensor, and displays this value or outputs a signal corresponding to this value.
Ｕ実施例ｊ
以下、本発明の一実施例を第１図〜第２図により説明す
る。Embodiment j An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
第１図において、符号Ｉで示すものは酸素センサである
。酸素センサＩは一般にガルバニ式酸素濃度センサと呼
ばれるもので、第２図に示すように、セル２内に電解液
３を充填し、アノード４と隔膜６が取り付けられたカソ
ード５とを前記電解ｌ夜３の中に共に浸漬してなり、前
記隔膜６がセル２の外部を臨むようにカソード５をセル
２に取り付けたものである。In FIG. 1, the symbol I indicates an oxygen sensor. The oxygen sensor I is generally called a galvanic oxygen concentration sensor, and as shown in FIG. The cathode 5 is attached to the cell 2 so that the diaphragm 6 faces the outside of the cell 2.
ここで、セル２はガラス等により密閉状態に形成された
もので、互いに密閉状態に仕切られた電解液室２ａと電
子計測室２ｂとを有し、前記電解液３はこの電解液室２
ａに充填されている。また、前記電解液３としては、例
えば水酸化カリウムの４０〜７０％水溶液を用いること
ができ、アノード４とカソード５の材料としては、それ
ぞれ鉛と白金を用いることができる。また、隔膜６は、
酸素のみを選択的に透過するもので、例えば１０〜２０
μｍの厚さのポリ弗化エチレン膜等を用いることができ
る。また、符号７及び８で示すものは、それぞれアノー
ド４とカソード５に電気的に接続された配線である。さ
らに、符号９及びｌＯで示すものは、前記電子計測室ｇ
ｂ内に配され、配線７．８間に直列に接続された、それ
ぞれ定抵抗と忍度浦正のためのサーミスタである。Here, the cell 2 is formed in a hermetically sealed state using glass or the like, and has an electrolyte chamber 2a and an electronic measurement chamber 2b that are hermetically partitioned from each other.
It is filled in a. Further, as the electrolytic solution 3, for example, a 40 to 70% aqueous solution of potassium hydroxide can be used, and as the materials for the anode 4 and the cathode 5, lead and platinum can be used, respectively. Moreover, the diaphragm 6 is
It selectively permeates only oxygen, for example 10 to 20
A polyfluoroethylene film or the like having a thickness of μm can be used. Moreover, what is indicated by the symbols 7 and 8 are wirings electrically connected to the anode 4 and the cathode 5, respectively. Furthermore, what is indicated by the symbols 9 and 1O is the electronic measurement chamber g.
These are the thermistors for constant resistance and Shinobu Uramasa, respectively, which are arranged in b and connected in series between wires 7 and 8.
この酸素センサｌの配線７，８には、電圧計１１が電気
的に接続されている。電圧計１１は前記配線７，８間の
電圧に比例する信号Ｅを後述する測定器本体１２に出力
するものである。この電圧計１１には、測定器本体１２
が接続されている。A voltmeter 11 is electrically connected to the wirings 7 and 8 of this oxygen sensor l. The voltmeter 11 outputs a signal E proportional to the voltage between the wires 7 and 8 to a measuring device main body 12, which will be described later. This voltmeter 11 includes a measuring device body 12.
is connected.
測定器本体１２は前記信号Ｅと後述する圧力センサ１３
からの信号Ｐにより、相対酸素濃度に応じた値Ｃを演算
し、この値Ｃを表示するか信号として出力するものであ
る。この測定器本体Ｉ２には圧力センサ１３が接続され
ているＪ圧力センサ１３は雰囲気の全圧に比例した信号
Ｐを測定器本体１２に出力するものである。The measuring device main body 12 receives the signal E and a pressure sensor 13 to be described later.
A value C corresponding to the relative oxygen concentration is calculated based on the signal P from the sensor, and this value C is displayed or output as a signal. A pressure sensor 13 is connected to this measuring device main body I2, and the J pressure sensor 13 outputs a signal P proportional to the total pressure of the atmosphere to the measuring device main body 12.
ここで、上記測定器本体１２の演算処理とじては、具体
的には、例えば下記の式のようにすればよい。Here, specifically, the arithmetic processing of the measuring instrument main body 12 may be performed using the following equation, for example.
ＣｃｃＥ／Ｐ ・＝−＝
−（１）今、上記構成からなる酸素濃度測定器を用いて
、例えば室Ａ内の酸素濃度を測定するためには、酸素セ
ンサｌと圧力センサ１３を室Ａ内に取り付け、電圧計１
１と測定器本体１２を動作させればよい。CccE/P ・=-=
- (1) Now, in order to measure the oxygen concentration in room A, for example, using the oxygen concentration measuring device having the above configuration, install oxygen sensor l and pressure sensor 13 in room A, and install voltmeter 1 in room A.
1 and the measuring instrument main body 12 should be operated.
すると、酸素センサ１においては、室Δ内から隔膜５を
透過した酸素がカソード５上で下記式に従って還元され
る。Then, in the oxygen sensor 1, oxygen that has passed through the diaphragm 5 from inside the chamber Δ is reduced on the cathode 5 according to the following formula.
Ｏｘ ＋２ Ｈｔ Ｏ＋４ ｅ−→４０ Ｈ−・旧・・
（■）また、この反応に伴ってアノード４上では下記式
に従って酸化反応が進行する。Ox +2 Ht O+4 e-→40 H-・Old・・
(■) Additionally, along with this reaction, an oxidation reaction proceeds on the anode 4 according to the following formula.
２Ｐｂ茸”＋４０８−→２Ｐｂ（ＯＨ）、・・・・・・
＜ｍ＞このカソード５上の還元反応とアノード４上の酸
化反応により、アノード４とカソード５間に定抵抗９と
サーミスタ１０を介して電流が流れる。そして、この電
流は室Ａ内の酸素分圧ρに比例するため、配線７，８間
の電圧及び電圧計ＩＩの出力、信号Ｅも酸素分圧ｐに比
例し、下記の式が成り立つ。2Pb mushroom"+408-→2Pb(OH),...
<m> Due to this reduction reaction on the cathode 5 and oxidation reaction on the anode 4, a current flows between the anode 4 and the cathode 5 via the constant resistor 9 and thermistor 10. Since this current is proportional to the oxygen partial pressure ρ in the room A, the voltage between the wirings 7 and 8, the output of the voltmeter II, and the signal E are also proportional to the oxygen partial pressure p, and the following equation holds true.
Ｅ＝に−１） ・・・・・・（
ＩＶ）ここで、ｋは隔膜６の厚さ等に依存する酸素セン
サｌの特性により決まる比例定数である。E=ni-1) ・・・・・・(
IV) Here, k is a proportionality constant determined by the characteristics of the oxygen sensor l, which depends on the thickness of the diaphragm 6 and the like.
また、圧力センサ１３は室への全圧ｐ０に比例した信号
Ｐを出力し、下記式が成り立つ。Moreover, the pressure sensor 13 outputs a signal P proportional to the total pressure p0 into the chamber, and the following equation holds true.
ｐ＝ｋｏ・ｐｏ ・・・・・・（Ｖ
）ここで、ｋｏは圧力センサＩ３の特性により決まる比
例定数である。p=ko・po・・・・・・(V
) Here, ko is a proportionality constant determined by the characteristics of the pressure sensor I3.
そして、測定器本体１２は上記信号Ｅ及びＰ ｈｚら式
（１）に基づいてＣの値を演算し、これを表示するか信
号として出力する。ここで、Ｃの値（ま具体的には式（
ｒ）に式（ＩＶ ）、 （Ｖ ） を代入して下ｊ己
のようになる。Then, the measuring device main body 12 calculates the value of C based on the above-mentioned signal E and Phz et al. equation (1), and displays or outputs it as a signal. Here, the value of C (or more specifically, the formula (
By substituting equations (IV) and (V) into r), the following is obtained.
Ｃｃｘ−（ｋ／ｋｏ）−ｐ／ｐｏ ・＝−（Ｖ
ｌ）また、室への全体積をｖｏ、室Ａ内の酸素力（占め
る体積をＶとすると、
ｐ、−Ｖ＝ｐ’Ｖｏ ・・・・・・（
■）という関係が成り立つので、式（■）により式（Ｖ
ｌ）を変形すれば、
Ｃ”（ｋ／に、）・ｖ／ｖｏ −・−・・（
■）となる。したがって、前記定数に、に、は既知であ
るので、Ｃの値により室Ａ内の体積の相対酸素濃度ｖ
／ ｖ ｏを知ることができる。Ccx-(k/ko)-p/po ・=-(V
l) Also, if the total volume to the chamber is vo, and the oxygen power in chamber A (occupied volume is V, then p, -V=p'Vo...
Since the relationship (■) holds true, the formula (■) allows the formula (V
If we transform l), we get C”(k/, )・v/vo −・−・・(
■). Therefore, since the above constants, and are known, the relative oxygen concentration v of the volume in the chamber A is determined by the value of C.
/ vo can be known.
本実施例の酸素濃度測定器によれば、測定しようとする
室の圧力（全圧ｐ。）にかかわらず、出力される信号Ｃ
の値と相対酸素濃度の関係は式（■）に示すように一定
しているので、圧力に影響されないで相対酸素濃度を測
定することができる。このため、圧力補正のための校正
を行う必要がなく、測定作業が容易になるとともに、リ
アルタイムで測定することができるという効果がある。According to the oxygen concentration measuring device of this embodiment, the signal C is output regardless of the pressure (total pressure p.) in the chamber to be measured.
Since the relationship between the value of and the relative oxygen concentration is constant as shown in equation (■), the relative oxygen concentration can be measured without being affected by pressure. Therefore, there is no need to perform calibration for pressure correction, which makes the measurement work easier and allows for real-time measurement.
また、酸素センサｌは電池反応を利用したものであるの
で電力を必要としない、このため測定器全体としては圧
力センサ１３や電圧計１１等の他には外部電源が不要な
ので、測定器の消費電力が少ないという効果がある。さ
らに、一般に長寿、命と言われているガルバニ式酸素セ
ンサは、測定器の寿命をも長くすることができるという
効果がある。In addition, since the oxygen sensor l uses a battery reaction, it does not require electric power. Therefore, the measuring device as a whole does not require an external power source other than the pressure sensor 13, voltmeter 11, etc., so the consumption of the measuring device is reduced. This has the effect of requiring less electricity. Furthermore, the galvanic oxygen sensor, which is generally said to have a long life, has the effect of extending the life of the measuring device.
「発明の効果」
本発明の酸素濃度測定器によれば、測定器本体は酸素セ
ンサと圧力センサの信号により雰囲気の相対酸素濃度を
演算し、この値を表示するかこの値に応じた信号を出力
するので、圧力に影響されないで相対酸素濃度を測定す
ることができる。このため、圧力補正のための校正を行
う必要がなく、測定作業が容易になるとともに、リアル
タイムで測定することができるという効果がある。"Effects of the Invention" According to the oxygen concentration measuring instrument of the present invention, the measuring instrument body calculates the relative oxygen concentration of the atmosphere based on the signals from the oxygen sensor and the pressure sensor, and displays this value or sends a signal corresponding to this value. Since the output is output, relative oxygen concentration can be measured without being affected by pressure. Therefore, there is no need to perform calibration for pressure correction, which makes the measurement work easier and allows for real-time measurement.
第１図〜第２図は本発明の酸素濃度測定器を示す図であ
って、第１図は酸素濃度測定器の全体を表すブロック図
、第２図は酸素センサの縦断面図である。
■・・・・・・酸素センサ、１２・・・・・・測定器本
体、Ｉ３・・・・・・圧力スイッチ。
第１図
第２図1 and 2 are diagrams showing an oxygen concentration measuring device of the present invention, in which FIG. 1 is a block diagram showing the entire oxygen concentration measuring device, and FIG. 2 is a longitudinal sectional view of the oxygen sensor. ■...Oxygen sensor, 12...Meter body, I3...Pressure switch. Figure 1 Figure 2
Claims (1)
と、雰囲気の全圧に比例した信号を出力する圧力センサ
と、前記酸素センサと前記圧力センサの信号により雰囲
気の相対酸素濃度を演算し、この値に応じた信号を出力
する測定器本体とを具備してなる酸素濃度測定器。an oxygen sensor that outputs a signal proportional to the oxygen partial pressure of the atmosphere, a pressure sensor that outputs a signal proportional to the total pressure of the atmosphere, and a relative oxygen concentration of the atmosphere calculated from the signals of the oxygen sensor and the pressure sensor, An oxygen concentration measuring device comprising a measuring device main body that outputs a signal according to this value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1009173A JPH02189453A (en) | 1989-01-18 | 1989-01-18 | Oxygen concentration measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1009173A JPH02189453A (en) | 1989-01-18 | 1989-01-18 | Oxygen concentration measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02189453A true JPH02189453A (en) | 1990-07-25 |
Family
ID=11713190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1009173A Pending JPH02189453A (en) | 1989-01-18 | 1989-01-18 | Oxygen concentration measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02189453A (en) |
-
1989
- 1989-01-18 JP JP1009173A patent/JPH02189453A/en active Pending
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