JPH0743340B2 - Oxygen concentration detector - Google Patents
Oxygen concentration detectorInfo
- Publication number
- JPH0743340B2 JPH0743340B2 JP60079557A JP7955785A JPH0743340B2 JP H0743340 B2 JPH0743340 B2 JP H0743340B2 JP 60079557 A JP60079557 A JP 60079557A JP 7955785 A JP7955785 A JP 7955785A JP H0743340 B2 JPH0743340 B2 JP H0743340B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- voltage
- sensor
- inverting amplifier
- zirconia
- 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 - Lifetime
Links
- 239000001301 oxygen Substances 0.000 title claims description 33
- 229910052760 oxygen Inorganic materials 0.000 title claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 31
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 46
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 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
- G01N27/26—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
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/4065—Circuit arrangements specially adapted therefor
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)
- Measuring Oxygen Concentration In Cells (AREA)
Description
【発明の詳細な説明】 （イ） 産業上の利用分野 本発明は化学実験装置若しくは測定装置に用いられ、被
測定雰囲気中の酸素濃度を検出する酸素濃度検出装置に
関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an oxygen concentration detecting device used in a chemical experiment device or a measuring device for detecting the oxygen concentration in an atmosphere to be measured.
（ロ） 従来の技術 本発明の適用対象であるジルコニア式センサー（１）を
第２図に示す。センサー（１）は酸化ジルコニウム（以
下ジルコニアと称す。）板に電圧を印加すると、高温で
酸素イオンの移動が起こることを利用して雰囲気中の酸
素濃度を検出するもので、ジルコニア板（２）の片側に
小孔（３）を穿設したキャップ（４）を被せ、ジルコニ
ア板（２）の両面には更に電極（５）（６）が取り付け
てある。電極（５）（６）はそれぞれリード線（７）
（８）が取り付けられ、このジルコニア板（２）をヒー
タ（10）によって例えば350℃等の一定の高温度に加熱
する。(B) Conventional Technology A zirconia sensor (1) to which the present invention is applied is shown in FIG. The sensor (1) detects the oxygen concentration in the atmosphere by utilizing the fact that when a voltage is applied to a zirconium oxide (hereinafter referred to as zirconia) plate, oxygen ions move at high temperature. The zirconia plate (2) A cap (4) having a small hole (3) formed on one side thereof is covered, and electrodes (5) and (6) are further attached to both surfaces of the zirconia plate (2). The electrodes (5) and (6) are lead wires (7), respectively.
(8) is attached, and the zirconia plate (2) is heated by the heater (10) to a constant high temperature such as 350 ° C.
第３図はセンサー（１）の特性を示した図である。
（VS）はリード線（７）（８）を介し電極（５）（６）
間に印加される電圧であり、（Ｉ）はリード線（８）を
流れる電流である。（L1）、（L2）、（L3）及び（L4）
はそれぞれ酸素濃度が５％、20％、40％及び80％の時の
電圧（VS）と電流（Ｉ）の関係を示す曲線である。即ち
図より一点鎖線（L5）（L6）で挾まれた範囲では一つの
酸素濃度に対して一つの電流（Ｉ）の値が定まることが
分る。この電流を限界電流と言う。限界電流を与える電
圧（VS）は酸素濃度により異なってくる。FIG. 3 is a diagram showing the characteristics of the sensor (1).
(V S ) is the electrode (5) (6) via the lead wire (7) (8)
Is a voltage applied between them, and (I) is a current flowing through the lead wire (8). (L 1 ), (L 2 ), (L 3 ) and (L 4 )
Are curves showing the relationship between the voltage (V S ) and the current (I) when the oxygen concentration is 5%, 20%, 40% and 80%, respectively. That is, it can be seen from the figure that one current (I) value is determined for one oxygen concentration in the range surrounded by the one-dot chain line (L 5 ) (L 6 ). This current is called the limiting current. The voltage (V S ) that gives the limiting current depends on the oxygen concentration.
第５図はセンサー（１）を利用した酸素濃度検出装置の
従来の電気回路を示している。（ZD）は定電圧（VE）を
作るツェナーダイオード、（Ｃ）はノイズ吸収用のコン
デンサであり、（VE）と同一のコンデンサ（Ｃ）の端子
電圧（VF1）は演算増幅器（100）の非反転入力（＋）に
入力される。演算増幅器（100）は抵抗（101）（102）
と共い、それらの値によって決まる所定のゲインを有し
た非反転増幅器（111）を構成し、その出力電圧（V11）
にはセンサー（１）のリード線（７）が接続される。セ
ンサー（１）のリード線（８）は抵抗（104）に接続さ
れ、抵抗（104）の端子電圧（V21）は、抵抗（106）（1
07）と共に、それらの値で決まる所定のゲインを有する
非反転増幅器（112）を構成する演算増幅器（108）の非
反転入力（＋）に入力される構成である。FIG. 5 shows a conventional electric circuit of an oxygen concentration detecting device using the sensor (1). (ZD) is a Zener diode that creates a constant voltage (V E ), (C) is a noise absorbing capacitor, and the terminal voltage (V F1 ) of the same capacitor (C) as (V E ) is the operational amplifier (100 ) Non-inverting input (+). The operational amplifier (100) is a resistor (101) (102)
And a non-inverting amplifier (111) having a predetermined gain determined by those values, and its output voltage (V 11 )
The lead wire (7) of the sensor (1) is connected to. The lead wire (8) of the sensor (1) is connected to the resistor (104), and the terminal voltage (V 21 ) of the resistor (104) is equal to the resistor (106) (1
07) together with a non-inverting input (+) of an operational amplifier (108) that constitutes a non-inverting amplifier (112) having a predetermined gain determined by those values.
（ハ） 発明が解決しようとする問題点 第５図の回路に於いて、センサー（１）の電極（５）
（６）間に印加される電圧（VS1）は電圧（V11）と（V
21）の差の値である。ここで抵抗（104）の抵抗値を極
めて小さい値とし、非反転増幅器（112）のゲインを大
なる値とすれば、リード線（８）を流れる電流（Ｉ）の
変化に対して電圧（VS1）は殆ど影響されず、（V11）は
一定であるから、第３図中点線で示す略一定の値（例え
ば1.5V）となる。この状態でセンサー（１）の設けられ
た雰囲気中の酸素濃度が変化すると電流（Ｉ）が変化す
るから（V21）の値が（微小ではあるが）変化するの
で、それを増幅した電圧（V01）の値により酸素濃度を
検出することができるが、電圧（VS1）が（L5）と
（L6）の間にあるのは、高々酸素濃度が30％程の値まで
であるから、それ以上の濃度になると限界電流の外に出
てしまい、測定不可能となってしまう。この状態は第６
図に示される。即ち、酸素濃度が30％までは濃度の変化
に応じて出力電圧（V01）も変化するが、それより上の
値になると飽和状態となり濃度に応じた出力電圧とはな
らなくなってしまう。(C) Problems to be solved by the invention In the circuit of FIG. 5, the electrode (5) of the sensor (1)
The voltage (V S1 ) applied between (6) is the voltage (V 11 ) and (V
21 ) The difference value. Here, if the resistance value of the resistor (104) is set to an extremely small value and the gain of the non-inverting amplifier (112) is set to a large value, the voltage (V) changes with respect to the change of the current (I) flowing through the lead wire (8). Since S1 ) is hardly affected and (V 11 ) is constant, it becomes a substantially constant value (for example, 1.5 V) shown by the dotted line in FIG. In this state, if the oxygen concentration in the atmosphere in which the sensor (1) is installed changes, the current (I) also changes, so the value of (V 21 ) changes (albeit slightly), so the amplified voltage ( The oxygen concentration can be detected by the value of (V 01 ), but the voltage (V S1 ) is between (L 5 ) and (L 6 ) only when the oxygen concentration is at most about 30%. Therefore, when the concentration is higher than that, the current goes out of the limiting current and measurement becomes impossible. This state is the sixth
As shown in the figure. That is, the output voltage (V 01 ) changes according to the change of the oxygen concentration up to 30%, but when it becomes a value higher than that, it becomes saturated and the output voltage according to the concentration is not obtained.
この様な不都合は、抵抗（104）の値が大きいと電流
（Ｉ）による影響が生ずるため、第３図の点線（VS1）
が更に負の係数で傾くようになるので、更に低い濃度ま
でしか限界電流の範囲に入らなくなるので、一層深刻な
問題となる。Such inconvenience is caused by the current (I) when the value of the resistor (104) is large, so the dotted line (V S1 ) in FIG.
Becomes even more negative, so that the limit current can be entered only to a lower concentration, which is a more serious problem.
（ニ） 問題点を解決するための手段 本発明は斯かる問題点を解決するために、ジルコニア板
２の片側に小孔３を形成したキャップ４を被せ、前記ジ
ルコニア板２両側に設けた電極5,6に流れる電流値によ
って雰囲気中の酸素濃度を検出するジルコニア式センサ
ー１と、このセンサーの入力側の電極５に出力端子を接
続する非反転増幅器19と、前記センサー１の出力側の電
極６に非反転入力端子を接続する非反転増幅器25とで構
成し、前記非反転増幅器19の非反転入力端子に定電圧VE
を分圧する抵抗15を介して定電圧端子VCCと、前記非反
転増幅器25の出力電圧V0を分圧する抵抗28を介してこの
非反転増幅器25の出力端子とを接続したものである。(D) Means for Solving the Problems In order to solve such problems, the present invention covers the zirconia plate 2 with a cap 4 having a small hole 3 formed on one side thereof and electrodes provided on both sides of the zirconia plate 2. A zirconia sensor 1 for detecting the oxygen concentration in the atmosphere by the values of the currents flowing through 5, 6, a non-inverting amplifier 19 for connecting an output terminal to an electrode 5 on the input side of the sensor, and an electrode on the output side of the sensor 1. 6 and a non-inverting amplifier 25 having a non-inverting input terminal connected thereto, and a constant voltage V E is applied to the non-inverting input terminal of the non-inverting amplifier 19.
The constant voltage terminal V CC is connected via a resistor 15 for dividing the voltage to the output terminal of the non-inverting amplifier 25 via a resistor 28 for dividing the output voltage V 0 of the non-inverting amplifier 25.
（ホ）作用 本発明は上記のように構成したことにより、ジルコニア
式センサーの電極に印加する電圧を酸素濃度に応じて出
力される出力電圧をフィードバックして変化させて各酸
素濃度の限界電流の範囲内に逐次変更させられ、０〜10
0％の全ての範囲での酸素濃度の検出を可能にしてい
る。(E) Action The present invention is configured as described above, and the voltage applied to the electrode of the zirconia sensor is changed by feeding back the output voltage output according to the oxygen concentration to change the limiting current of each oxygen concentration. It is changed sequentially within the range, 0-10
It makes it possible to detect the oxygen concentration in the entire range of 0%.
（ヘ） 実施例 図面により実施例を説明する。適用するジルコニア式セ
ンサーは第３図の特性を有した第２図と同一であり、
又、第１図中第５図と同一符号のものは同一であるとす
る。第１図は本発明の酸素濃度検出装置（14）の回路を
示し、定電圧（VE）は抵抗（15）を介してコンデンサ
（Ｃ）に接続され、コンデンサ（Ｃ）の端子電圧（VF）
は演算増幅器（16）の非反転入力（＋）に入力される。
演算増幅器（16）は抵抗（17）（18）と共に所定のゲイ
ンを有した非反転増幅器（19）を構成している。演算増
幅器（16）の出力電圧（V1）にはセンサー（１）のリー
ド線（７）が接続され、リード線（８）は抵抗（21）に
接続される。抵抗（21）の端子電圧（V2）は抵抗（23）
（24）と共に所定のゲインを有した非反転増幅器（25）
を構成する演酸増幅器（26）の非反転入力（＋）に入力
される。演算増幅器（26）の出力電圧（V0）は抵抗（2
8）を介してコンデンサ（Ｃ）に接続される。(F) Example An example will be described with reference to the drawings. The applied zirconia sensor is the same as that shown in FIG. 2 having the characteristics shown in FIG.
Further, the same reference numerals as those in FIG. 5 in FIG. 1 are the same. FIG. 1 shows a circuit of the oxygen concentration detector (14) of the present invention, in which a constant voltage (V E ) is connected to a capacitor (C) via a resistor (15), and the terminal voltage (V of the capacitor (C) is F )
Is input to the non-inverting input (+) of the operational amplifier (16).
The operational amplifier (16) constitutes a non-inverting amplifier (19) having a predetermined gain together with the resistors (17) and (18). The lead wire (7) of the sensor (1) is connected to the output voltage (V 1 ) of the operational amplifier (16), and the lead wire (8) is connected to the resistor (21). The terminal voltage (V 2 ) of the resistor (21) is the resistance (23)
(24) and a non-inverting amplifier having a predetermined gain (25)
Is input to the non-inverting input (+) of the acid desorption amplifier (26). The output voltage (V 0 ) of the operational amplifier (26) is the resistance (2
It is connected to the capacitor (C) via 8).
本発明の回路では電圧（VF）は電圧（VE）と出力電圧
（V0）を抵抗（15）（28）で分圧した値であり、出力電
圧（V0）の変化に比例して変化し、（V0）が上昇すれば
（VF）は上昇し、下降すれば同様に下降する様になる。In the circuit of the present invention, the voltage (V F ) is the voltage (V E ) and the output voltage (V 0 ) divided by the resistors (15) and (28), and is proportional to the change in the output voltage (V 0 ). When (V 0 ) rises, (V F ) rises, and when it falls, it also falls.
一方、センサー（１）の雰囲気中の酸素濃度が例えば上
昇すると第３図より電極（６）とリード線（８）を流れ
る電流（Ｉ）が上昇するので電圧（V2）も上昇する。
（V2）が上昇すると、それを増幅した出力電圧（V0）も
上昇するから、前述の如く（VF）が上昇し、同様に増幅
された電圧（V1）も上昇する。この（V1）の上昇分を
（V2）の上昇分より大なる如く設定しておけば（V1）
（V2）の差である電極（５）（６）間の印加電圧
（VS0）も上昇する。同様にセンサー（１）周囲の酸素
濃度が減少すると、電流（Ｉ）が減少するため電圧
（V2）が下降し、上述と同様に最終的に（V1）が（V2）
の下降よりも大きい割合で降下するので印加電圧
（VS0）が降下する。この模様を第３図中の直線状実線
で示す。即ち、各抵抗の値を適当に設定する事によって
酸素濃度が変化しても常に電圧（VS0）が（L5）と
（L6）の間即ち限界電流を与える範囲中に自動的に移行
するようになる。この時の酸素濃度に対する出力電圧
（V0）の値を第４図に示す。即ち酸素濃度０％から略10
0％の範囲で、それに比例した出力電圧（V0）を得る事
ができる。又、ここでは抵抗（21）の値の制約が少なく
なる。On the other hand, when the oxygen concentration in the atmosphere of the sensor (1) rises, for example, the current (I) flowing through the electrode (6) and the lead wire (8) rises as shown in FIG. 3, so that the voltage (V 2 ) also rises.
When (V 2 ) rises, the amplified output voltage (V 0 ) also rises, so that (V F ) rises as described above, and the amplified voltage (V 1 ) also rises. If the rise of (V 1 ) is set to be larger than the rise of (V 2 ) (V 1 )
The applied voltage (V S0 ) between the electrodes (5) and (6), which is the difference of (V 2 ), also rises. Similarly, when the oxygen concentration around the sensor (1) decreases, the current (I) decreases, so the voltage (V 2 ) decreases, and finally (V 1 ) becomes (V 2 ) as described above.
The applied voltage (V S0 ) drops because it drops at a rate higher than the drop of. This pattern is shown by a straight solid line in FIG. That is, even if the oxygen concentration changes by setting the value of each resistance appropriately, the voltage (V S0 ) always automatically shifts between (L 5 ) and (L 6 ), that is, within the range that gives the limiting current. Come to do. The value of the output voltage (V 0 ) with respect to the oxygen concentration at this time is shown in FIG. That is, the oxygen concentration is 0% to about 10
In the range of 0%, an output voltage (V 0 ) proportional to it can be obtained. Also, here, there are less restrictions on the value of the resistor (21).
第２図に示す小孔（３）付キャップ（４）を用いたジル
コニア式センサー（１）は従来の標準ガスを用いるジル
コニア式センサーに比してセンサー自体が小型化でき、
又、加熱用のヒータの発熱量が小さくて済む等種々の利
点を有するものである。しかし乍ら従来では酸素濃度の
測定範囲が狭いと言う欠点があったが、本発明によれば
広範囲な測定が可能となり、前述の利点のみを享受でき
るようになる。The zirconia sensor (1) using the cap (4) with the small hole (3) shown in FIG. 2 can be downsized as compared with the conventional zirconia sensor using standard gas.
Further, it has various advantages such that the heating value of the heater for heating is small. However, in the past, there was a drawback that the measuring range of the oxygen concentration was narrow, but according to the present invention, a wide range of measurement can be performed, and only the above-mentioned advantages can be enjoyed.
（ト） 発明の効果 本発明によれば、ジルコニア板２の片側に小孔３を形成
したキャップ４を被せ、前記ジルコニア板２両側に設け
た電極5,6に流れる電流値によって雰囲気中の酸素濃度
を検出するジルコニア式センサー１と、このセンサーの
入力側の電極５に出力端子を接続する非反転増幅器19
と、前記センサー１の出力側の電極６に非反転入力端子
を接続する非反転増幅器25とで構成し、前記非反転増幅
器19の非反転入力端子に定電圧VEを分圧する抵抗15を介
して定電圧端子VCCと、前記非反転増幅器25の出力電圧V
0を分圧する抵抗28を介してこの非反転増幅器25の出力
端子とを接続したので、ジルコニア式センサー１に入力
する電圧V1を増幅する非反転増幅器19の非反転入力端子
に出力側の非反転増幅器25の出力電圧V0と定電圧VEとを
抵抗15,28で分圧した電圧VFを入力し、前記センサー１
の電極5,6間へ印加する印加電圧を酸素濃度に応じて出
力側の非反転増幅器25の出力電圧V0に比例させることが
でき、酸素濃度の変化に応じてこの酸素濃度の限界電流
の範囲内に印加電圧を変化させることができ、０〜100
％の全ての範囲の測定を可能にすることができる。(G) Effect of the Invention According to the present invention, the zirconia plate 2 is covered with the cap 4 having the small holes 3 formed on one side, and the oxygen in the atmosphere is controlled by the current values flowing through the electrodes 5 and 6 provided on both sides of the zirconia plate 2. A zirconia sensor 1 for detecting concentration and a non-inverting amplifier 19 for connecting an output terminal to an electrode 5 on the input side of the sensor 19
And a non-inverting amplifier 25 connecting a non-inverting input terminal to the output side electrode 6 of the sensor 1, and a non-inverting input terminal of the non-inverting amplifier 19 via a resistor 15 for dividing the constant voltage V E. Constant voltage terminal V CC and the output voltage V of the non-inverting amplifier 25
Since the output terminal of the non-inverting amplifier 25 is connected through the resistor 28 that divides 0 , the non-inverting input terminal of the non-inverting amplifier 19 that amplifies the voltage V 1 input to the zirconia sensor 1 is connected to the non-inverting input terminal of the output side. The voltage V F obtained by dividing the output voltage V 0 of the inverting amplifier 25 and the constant voltage V E by the resistors 15 and 28 is input, and the sensor 1
The applied voltage applied between the electrodes 5 and 6 of can be made proportional to the output voltage V 0 of the non-inverting amplifier 25 on the output side according to the oxygen concentration, and the limit current of this oxygen concentration can be changed according to the change of the oxygen concentration. The applied voltage can be changed within the range of 0-100
It is possible to allow measurements in the entire range of%.
第１図乃至第４図は本発明の実施例を示し、第１図は酸
素濃度検出装置の電気回路図、第２図はジルコニア式セ
ンサーの断面図、第３図はジルコニア式センサーの特性
を示す図、第４図は第１図の電気回路の出力電圧を示す
図であり、第５図は従来の電気回路図、第６図は第５図
の電気回路の出力電圧を示す図である。 （１）……ジルコニア式センサー、（２）……ジルコニ
ア板、（３）……小孔、（４）……キャップ、（５）
（６）……電極、（14）……酸素濃度検出装置、
（VS0）……印加電圧。1 to 4 show an embodiment of the present invention, FIG. 1 is an electric circuit diagram of an oxygen concentration detector, FIG. 2 is a sectional view of a zirconia sensor, and FIG. 3 shows characteristics of a zirconia sensor. Fig. 4 is a diagram showing the output voltage of the electric circuit of Fig. 1, Fig. 5 is a conventional electric circuit diagram, and Fig. 6 is a diagram showing the output voltage of the electric circuit of Fig. 5. . (1) …… Zirconia sensor, (2) …… Zirconia plate, (3) …… Small hole, (4) …… Cap, (5)
(6) …… Electrode, (14) …… Oxygen concentration detector,
(V S0 ) ... Applied voltage.
Claims (1)
キャップ４を被せ、前記ジルコニア板２両側に設けた電
極5,6に流れる電流値によって雰囲気中の酸素濃度を検
出するジルコニア式センサー１と、このセンサーの入力
側の電極５に出力端子を接続する非反転増幅器19と、前
記センサー１の出力側の電極６に非反転入力端子を接続
する非反転増幅器25とで構成し、前記非反転増幅器19の
非反転入力端子に定電圧VEを分圧する抵抗15を介して定
電圧端子VCCと、前記非反転増幅器25の出力電圧V0を分
圧する抵抗28を介してこの非反転増幅器25の出力端子と
を接続したことを特徴とする酸素濃度検出装置。1. A zirconia sensor for detecting oxygen concentration in an atmosphere by covering a zirconia plate 2 with a cap 4 having a small hole 3 on one side and detecting the oxygen concentration in the atmosphere by the value of current flowing through electrodes 5, 6 provided on both sides of the zirconia plate 2. 1, a non-inverting amplifier 19 having an output terminal connected to the electrode 5 on the input side of the sensor, and a non-inverting amplifier 25 having a non-inverting input terminal connected to the electrode 6 on the output side of the sensor 1. The non-inverting input terminal of the non-inverting amplifier 19 has a constant voltage terminal V CC via a resistor 15 for dividing the constant voltage V E and the non-inverting amplifier 25 has a resistor 28 for dividing the output voltage V 0 of the non-inverting amplifier 25. An oxygen concentration detecting device characterized in that it is connected to an output terminal of an amplifier 25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60079557A JPH0743340B2 (en) | 1985-04-15 | 1985-04-15 | Oxygen concentration detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60079557A JPH0743340B2 (en) | 1985-04-15 | 1985-04-15 | Oxygen concentration detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61237047A JPS61237047A (en) | 1986-10-22 |
| JPH0743340B2 true JPH0743340B2 (en) | 1995-05-15 |
Family
ID=13693308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60079557A Expired - Lifetime JPH0743340B2 (en) | 1985-04-15 | 1985-04-15 | Oxygen concentration detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743340B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0227255A (en) * | 1988-07-18 | 1990-01-30 | Fuji Electric Co Ltd | Oxygen sensor |
| JP2655885B2 (en) * | 1988-08-05 | 1997-09-24 | 株式会社フジクラ | Driving method of limiting current type gas concentration sensor |
| JP2791052B2 (en) * | 1988-10-06 | 1998-08-27 | 株式会社フジクラ | Driving method of gas concentration sensor |
| JP3680445B2 (en) * | 1996-10-08 | 2005-08-10 | 株式会社デンソー | Oxygen concentration detector |
| JP3757507B2 (en) * | 1996-12-24 | 2006-03-22 | 株式会社デンソー | Air-fuel ratio detection device |
| JP3487159B2 (en) * | 1997-05-21 | 2004-01-13 | 株式会社デンソー | Gas concentration detection device and method of manufacturing the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1071709A (en) * | 1975-12-05 | 1980-02-12 | Arnold O. Isenberg | Gas analysis apparatus |
| JPS5272286A (en) * | 1975-12-12 | 1977-06-16 | Toyoda Chuo Kenkyusho Kk | Oxygen concentration analyzer |
| JPS58162856A (en) * | 1982-03-23 | 1983-09-27 | Toyota Motor Corp | Method for detecting oxygen concentration |
| DE3247920A1 (en) * | 1982-12-24 | 1984-06-28 | Brown, Boveri & Cie Ag, 6800 Mannheim | METHOD AND CIRCUIT FOR MEASURING THE OXYGEN CONCENTRATION IN GAS MIXTURES |
-
1985
- 1985-04-15 JP JP60079557A patent/JPH0743340B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61237047A (en) | 1986-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0807818B1 (en) | Method for measuring nitrogen oxide | |
| EP0798557B1 (en) | Gas sensor and method of measuring quantity of specific compounds in measuring gas | |
| EP0314919B1 (en) | Combustible gas detector having temperature stabilization capability | |
| US4461166A (en) | Dynamic current drive method for powering thermal conductivity detectors | |
| EP0121905A1 (en) | Oxygen sensor | |
| JPH0743340B2 (en) | Oxygen concentration detector | |
| JP3736921B2 (en) | Air-fuel ratio sensor | |
| JP4091713B2 (en) | Compound gas sensor | |
| JPH0644015B2 (en) | Current detector | |
| JP3646898B2 (en) | Contact combustion type gas sensor constant current drive circuit | |
| JP4575862B2 (en) | Gas detector | |
| JPS6014148A (en) | Gas sensor | |
| JPS60260842A (en) | Heater temperature control circuit for air-fuel ratio sensor | |
| KR100186999B1 (en) | Gas sensor with thermopile | |
| JPH05232055A (en) | Humidity detecting device | |
| JPH05223770A (en) | Heat conduction type absolute humidity sensor | |
| JP3167549B2 (en) | Gas detector | |
| JPS63193058A (en) | Oxygen sensor | |
| JPH0620973Y2 (en) | Thermal flow sensor | |
| JPH0238820A (en) | Water level detector | |
| JPS6247015Y2 (en) | ||
| JPS586079Y2 (en) | Resistance electrical signal converter | |
| JPH0625701B2 (en) | Temperature detection circuit of 3-wire resistance temperature sensor | |
| JPS6033044A (en) | Device for measuring polarography electrode provided with temperature compensating function | |
| JPH01150818A (en) | Theremosensitive type flow rate sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |