JPH03195962A - Nitrogen oxide concentration measuring apparatus - Google Patents
Nitrogen oxide concentration measuring apparatusInfo
- Publication number
- JPH03195962A JPH03195962A JP1334845A JP33484589A JPH03195962A JP H03195962 A JPH03195962 A JP H03195962A JP 1334845 A JP1334845 A JP 1334845A JP 33484589 A JP33484589 A JP 33484589A JP H03195962 A JPH03195962 A JP H03195962A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- electrodes
- measured
- gas
- cell
- 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
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title abstract description 63
- 239000001301 oxygen Substances 0.000 claims abstract description 102
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 102
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000007789 gas Substances 0.000 claims abstract description 34
- 239000007784 solid electrolyte Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract 3
- -1 oxygen ion Chemical class 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 150000002927 oxygen compounds Chemical class 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 150000002926 oxygen Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、被測定ガス中に含まれる窒素酸化物の濃度を
測定する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for measuring the concentration of nitrogen oxides contained in a gas to be measured.
［従来の技術］
従来、酸化物気体の濃度測定装置として、特開平１−１
８９５５７号公報に記載のものが知られている。この装
置は、酸素ポンプ、を用いて被測定ガス中に含まれる単
体酸素及び化合物中の酸素の総和濃度を測定し、一方酸
素センサによって被測定ガス中の単体酸素の濃度を測定
し、両者の差から化合物中に含まれる酸素濃度を求めて
、その結果から被測定ガス中の酸素化合物の濃度を知る
というものであった。[Prior art] Conventionally, as an oxide gas concentration measuring device, the method disclosed in Japanese Patent Application Laid-open No. 1-1
The one described in Japanese Patent No. 89557 is known. This device uses an oxygen pump to measure the total concentration of elemental oxygen and oxygen in compounds contained in the gas to be measured, and an oxygen sensor to measure the concentration of elemental oxygen in the gas to be measured. The oxygen concentration contained in the compound was determined from the difference, and the concentration of the oxygen compound in the gas to be measured was determined from the result.
［発明が解決しようとする課題］
ところで、上記従来の装置は、酸素ポンプの両電極間を
流れる電気量を測定することにより、酸素濃度を検出す
るものであり、電気量測定手段を有している分コスト高
であった。また、従来装置は、酸素ポンプの両電極間に
印加する電圧を特定していないので、各種の酸素化合物
気体中の酸素濃度を検出してしまい、窒素酸化物の濃度
だけを１１１１１定することができなかった。[Problems to be Solved by the Invention] By the way, the above-mentioned conventional device detects the oxygen concentration by measuring the amount of electricity flowing between the two electrodes of the oxygen pump, and has a means for measuring the amount of electricity. However, the cost was high. Furthermore, since the conventional device does not specify the voltage applied between the two electrodes of the oxygen pump, it detects the oxygen concentration in various oxygen compound gases, making it impossible to determine only the concentration of nitrogen oxides. could not.
本発明は、」−記事情に鑑み、窒素酸化物の濃度のみを
低コストで測定することのできる装置を提供することを
目的とする。SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an apparatus that can measure only the concentration of nitrogen oxides at low cost.
［課題を解決するための手段］
本発明の窒素酸化物濃度測定装置は、上記目的を達成す
るために、
（ａ）酸素イオン伝導性固体電解質の両面に１対の多孔
質電極を配設して、酸素ポンプ及び酸素センサをそれぞ
れに構成し、
（ｂ）上記酸素ポンプを、被測定ガスの流入を拡散律速
により制限する小孔を有するセルの壁に設けて、それに
より該酸素ポンプの一方の電極をセル内部に、また他方
の電極を大気または被測定ガス中にそれぞれ臨ませ、
（Ｃ）そして上記酸素ポンプのセル内部側の電極を直流
電源のマイナス極、他方の電極を同直流電源のプラス極
に接続して両電極間に０．５Ｖ以下の電圧を印加するよ
う構成すると共に、（ｄ）この電圧印加回路中に、酸素
ポンプの両電極間を流れる電流値を測定する電流計を接
続し、（ｅ）一方、上記酸素センサを、被測定ガスと大
気とを隔てる壁に設けて、一方の電極を被測定ガス中に
、また他方の電極を大気中にそれぞれ臨ませ、
（ｆ）そして該酸素センサの両電極間に電圧計を接続し
た
ことを特徴としている。[Means for Solving the Problems] In order to achieve the above object, the nitrogen oxide concentration measuring device of the present invention has the following features: (a) a pair of porous electrodes are disposed on both sides of an oxygen ion conductive solid electrolyte; an oxygen pump and an oxygen sensor, respectively; (b) the oxygen pump is provided in the wall of the cell having a small hole that restricts the inflow of the gas to be measured by diffusion control; (C) The electrode on the inside of the cell of the oxygen pump is connected to the negative terminal of a DC power supply, and the other electrode is connected to the negative terminal of the same DC power supply. (d) An ammeter is connected to the positive electrode of the oxygen pump to apply a voltage of 0.5 V or less between the two electrodes, and (d) an ammeter is provided in this voltage application circuit to measure the value of the current flowing between the two electrodes of the oxygen pump. (e) On the other hand, the above oxygen sensor is installed on a wall separating the gas to be measured and the atmosphere, with one electrode facing into the gas to be measured and the other electrode facing into the atmosphere, ( f) A voltmeter is connected between both electrodes of the oxygen sensor.
［作用］
上記構成において、酸素ポンプでは、セル内部の電極が
マイナス極に接続されているので、セル内部の被測定ガ
ス中の単体酸素がイオン化されて、酸素イオン伝導性固
体電解質内を他方の電極に向かって移動し、プラス極に
接続された他方の電極で単体酸素となって放出される。[Function] In the above configuration, in the oxygen pump, since the electrode inside the cell is connected to the negative electrode, the elemental oxygen in the gas to be measured inside the cell is ionized, and the oxygen ion conductive solid electrolyte is ionized. It moves toward the electrode and is released as elemental oxygen at the other electrode connected to the positive electrode.
また、窒素酸化物は、セル内の電極において酸素と窒素
とに電気分解され、分解された酸素は単体酸素と同様に
して放出される。Further, nitrogen oxide is electrolyzed into oxygen and nitrogen at the electrodes within the cell, and the decomposed oxygen is released in the same manner as simple oxygen.
ここで、両電極間の電圧が０．５Ｖ以下に押えられてい
るので、他の酸素化合物は電気分解されず、窒素酸化物
中の酸素のみが酸素ポンプにより汲み出される。そして
、放出された酸素量に対応する電流が電極間を流れ、こ
の電流を電流計で測定することにより、被測定ガス中の
単体酸素と窒素酸化物中の酸素の総量を測定することが
できる。Here, since the voltage between both electrodes is suppressed to 0.5 V or less, other oxygen compounds are not electrolyzed, and only oxygen in the nitrogen oxide is pumped out by the oxygen pump. Then, a current corresponding to the amount of released oxygen flows between the electrodes, and by measuring this current with an ammeter, it is possible to measure the total amount of simple oxygen in the gas to be measured and oxygen in nitrogen oxides. .
この測定の際、セルの小孔からは一定量の被測定ガスの
み拡散流入するので、ＰｌｔｄｌｌＪ定ガス中の酸素濃
度を連続して検出することができる。なお、小孔から流
入する被測定ガスの流入量は、小孔面積、小孔の長さ、
拡散係数等から決まる。During this measurement, only a certain amount of the gas to be measured diffuses and flows through the small holes of the cell, so that the oxygen concentration in the PltdllJ constant gas can be continuously detected. In addition, the inflow amount of the gas to be measured flowing from the small hole is determined by the small hole area, the small hole length,
Determined from diffusion coefficient, etc.
また、一方の酸素センサにおいては、その７方の電極が
被測定ガス中に臨み、他方の電極が大気に臨んでいるの
で、両電極間の電圧を測定することにより、被測定ガス
中の単体酸素濃度を検出することができる。したがって
、前者の酸素ポンプによる測定結果と後者の酸素センサ
による測定結果との差から、窒素酸化物として存在した
酸素の濃度を求めることができ、その結果から被測定ガ
ス中の窒素酸化物の濃度を知ることができる。In addition, in one oxygen sensor, seven electrodes face the gas to be measured, and the other electrode faces the atmosphere, so by measuring the voltage between the two electrodes, it is possible to Oxygen concentration can be detected. Therefore, the concentration of oxygen present as nitrogen oxides can be determined from the difference between the measurement results by the former oxygen pump and the latter measurement results by the oxygen sensor, and from that result, the concentration of nitrogen oxides in the gas to be measured can be known.
［実施例］
以下、本発明の一実施例を添付図面を参照して説明する
。[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.
図において符号１で示すものは箱状のセルである。この
セル１は、内部が２つの密閉空間Ｓｌ、Ｓ２に区画され
ており、被測定ガスの流通する管２の壁に取り付けられ
、上側の空間Ｓｌが管２の内側、下側の空間Ｓ２が管２
の外側に位置している。このセル１の上側空間Ｓｌの壁
には、管２内を流通する被測定ガスが流入する小孔３が
形成されている。この小孔３は、空間Ｓｌへの被測定ガ
スの流入を拡散律速により制限するためのもので、直径
約２０μｍ程度のものである。In the figure, what is indicated by reference numeral 1 is a box-shaped cell. This cell 1 is internally divided into two sealed spaces Sl and S2, and is attached to the wall of a pipe 2 through which the gas to be measured flows, with the upper space Sl being inside the pipe 2 and the lower space S2 being tube 2
It is located outside of. A small hole 3 is formed in the wall of the upper space Sl of the cell 1, into which the gas to be measured flowing through the tube 2 flows. This small hole 3 is for restricting the inflow of the gas to be measured into the space Sl by diffusion control, and has a diameter of about 20 μm.
また、セルｌの上側空間Ｓｌの壁には、空間Ｓｌ内の酸
素を外部に汲み出すための酸素ポンプ４が設けられてい
る。この酸素ポンプ４は、セル１の壁面の一部として構
成された酸素イオン伝導性固体電解質４Ａと、その両面
に配設された１対の多孔質電極４Ｂ、４Ｃとからなる。Further, an oxygen pump 4 for pumping oxygen in the space Sl to the outside is provided on the wall of the space Sl above the cell l. This oxygen pump 4 consists of an oxygen ion conductive solid electrolyte 4A configured as a part of the wall surface of the cell 1, and a pair of porous electrodes 4B and 4C disposed on both sides of the solid electrolyte 4A.
この場合の酸素イオン伝導性固体電解質４Δは、ジルコ
ニア（Ｚｒｏ ｔ）にイツトリア（”ｉ’ ｔｏ ３）
を８モル％混合して焼結した安定化ジルコニアによって
平板状に形成されたもので、その一方の面がセル１の外
部に臨み、他方の面がセルｌの内部に臨んでいる。なお
、酸素イオン伝導性固体電解質４Ａとしては、勿論他の
材料を用いてもよい。In this case, the oxygen ion conductive solid electrolyte 4Δ is composed of zirconia (Zrot) and itria ("i' to 3)".
It is formed into a flat plate of stabilized zirconia made by sintering a mixture of 8 mol% of zirconia, with one surface facing the outside of the cell 1 and the other surface facing the inside of the cell 1. Note that, of course, other materials may be used as the oxygen ion conductive solid electrolyte 4A.
また、酸素ポンプ４の電極４ Ｂ、４Ｃは、金属その他
の導電性を有する材質を多孔質構造に形成したもので、
通常は、白金（ＰＬ）の粉末を焼結することによって形
成されている。画電極４Ｂ、４Ｃは、酸素イオン伝導性
固体電解質４Ａの表面に接して設けられている。そして
、セルｌ内部に臨む電極４Ｂに直流電源５のマイナス極
が接続され、セルｌ外部の電極４Ｃに直流電源５のプラ
ス極が接続され、画電極４Ｂ、４Ｃ間に０．５Ｖ以下の
電圧が印加されるようになっている。また、電極４Ｂと
直流電源５との間には、電極４Ｂ、４Ｃ間を流れる電流
値を測定するための電流計６が直列に接続されている。Further, the electrodes 4B and 4C of the oxygen pump 4 are made of metal or other conductive material and have a porous structure.
It is usually formed by sintering platinum (PL) powder. The picture electrodes 4B and 4C are provided in contact with the surface of the oxygen ion conductive solid electrolyte 4A. Then, the negative pole of the DC power supply 5 is connected to the electrode 4B facing inside the cell l, the positive pole of the DC power supply 5 is connected to the electrode 4C outside the cell l, and a voltage of 0.5V or less is applied between the picture electrodes 4B and 4C. is applied. Furthermore, an ammeter 6 is connected in series between the electrode 4B and the DC power supply 5 for measuring the value of the current flowing between the electrodes 4B and 4C.
また、空間Ｓ２側のセルｌの壁には、酸素センサ７が設
置されている。この酸素センサ７は、上記の酸素ポンプ
４と同様の構造のもので、セル１の壁の一部として設け
られた酸素イオン伝導性固体電解質７Ａと、その両面の
１対の多孔質電極７Ｂ、７Ｃとからなる。この酸素セン
サ７の一方の電極７Ｂは大気の流入する空間Ｓ２内に臨
み、他方の電極７Ｃは被測定ガスの流通する管２の内部
に臨んでいる。そして、画電極７Ｂ、７Ｃ間に、電圧計
８が接続されている。Further, an oxygen sensor 7 is installed on the wall of the cell l on the side of the space S2. This oxygen sensor 7 has the same structure as the oxygen pump 4 described above, and includes an oxygen ion conductive solid electrolyte 7A provided as a part of the wall of the cell 1, a pair of porous electrodes 7B on both sides of the solid electrolyte 7A, and a pair of porous electrodes 7B on both sides of the solid electrolyte 7A. It consists of 7C. One electrode 7B of this oxygen sensor 7 faces the space S2 into which the atmosphere flows, and the other electrode 7C faces the inside of the pipe 2 through which the gas to be measured flows. A voltmeter 8 is connected between the picture electrodes 7B and 7C.
また、セルｌの下側空間Ｓ２内には、セルｌの内部を均
一に加温するためのヒータ９と、ヒータ９の熱が直接酸
素センサ７に加わらないようにするための隔壁ＩＯが設
けられている。この空間Ｓ２は、連通孔１１により大気
に連通している。Further, in the lower space S2 of the cell l, a heater 9 for uniformly heating the inside of the cell l and a partition wall IO for preventing the heat of the heater 9 from being directly applied to the oxygen sensor 7 are provided. It is being This space S2 communicates with the atmosphere through a communication hole 11.
上記構成の測定装置において、酸素ポンプ４の画電極４
Ｂ、４０間に０．５Ｖ以下の電圧を印加すると、空間ｓ
Ｉ内の被測定ガス中の単体酸素が酸素ポンプ４によって
セル１外部に汲み出される。In the measuring device having the above configuration, the picture electrode 4 of the oxygen pump 4
When a voltage of 0.5V or less is applied between B and 40, the space s
Elemental oxygen in the gas to be measured in I is pumped out of the cell 1 by an oxygen pump 4.
同時に、窒素酸化物はセルｌ内部の電極において酸素と
窒素とに電気分解され、分解された酸素は単体酸素と同
様にセルｌ外部に汲み出される。At the same time, nitrogen oxide is electrolyzed into oxygen and nitrogen at the electrode inside the cell l, and the decomposed oxygen is pumped out of the cell l in the same way as simple oxygen.
ここで、画電極４Ｂ、４Ｃ間の電圧が０．５ｖ以下に押
えられていることにより、他の酸素化合物は電気分解さ
れず、窒素酸化物中の酸素のみが酸素ポンプ４により汲
み出される。そして、放出された酸素量に対応する電流
が電極４Ｂ、４Ｃ間を流れ、この電流を電流計６で測定
することにより、被測定ガス中の単体酸素と窒素酸化物
中の酸素の総量を測定することができる。Here, since the voltage between the picture electrodes 4B and 4C is suppressed to 0.5V or less, other oxygen compounds are not electrolyzed, and only oxygen in the nitrogen oxides is pumped out by the oxygen pump 4. Then, a current corresponding to the amount of released oxygen flows between the electrodes 4B and 4C, and by measuring this current with an ammeter 6, the total amount of simple oxygen in the gas to be measured and oxygen in nitrogen oxides is measured. can do.
上記測定において、空間Ｓｌ内に溜まっていた酸素をほ
とんど汲み出すと、その後は、セル１の小孔３からは一
定量の被測定ガスのみ拡散流入するので、被測定ガス中
の酸素濃度を連続して検出することができる。なお、こ
こで小孔３の寸法について触れると、小孔３の寸法は、
単位時間当たりに空間Ｓｌ内に流入する全酸素の量が、
酸素ポンプ４によって汲み出される酸素の量よりも小さ
（なるように設定されている。In the above measurement, once most of the oxygen accumulated in the space Sl is pumped out, only a certain amount of the gas to be measured diffuses and flows through the small hole 3 of the cell 1, so the oxygen concentration in the gas to be measured is continuously maintained. can be detected. In addition, referring to the dimensions of the small hole 3 here, the dimensions of the small hole 3 are as follows.
The total amount of oxygen flowing into the space Sl per unit time is
It is set to be smaller than the amount of oxygen pumped out by the oxygen pump 4.
また、一方の酸素センサ７においては、片方の電極７Ｃ
が被測定ガス中に臨み、もう片方の電極７Ｂが大気に臨
んでいることにより、酸素分圧差による起電力が画電極
７Ｂ、７Ｃ間に発生する。In addition, in one oxygen sensor 7, one electrode 7C
Because the electrode 7B faces the gas to be measured and the other electrode 7B faces the atmosphere, an electromotive force is generated between the picture electrodes 7B and 7C due to the difference in oxygen partial pressure.
よって、この電位差を電圧計８で測定することにより、
被測定ガス中の単体酸素濃度を測定することができる。Therefore, by measuring this potential difference with the voltmeter 8,
The concentration of simple oxygen in the gas to be measured can be measured.
したがって、前者の酸素ポンプ４による測定結果（単体
酸素＋窒素酸化物中の酸素の濃度）と後者の酸素センサ
７による測定結果（単体酸素の濃度）との差から、窒素
酸化物として存在した酸素の濃度を求めることができ、
その結果から被測定ガス中の窒素酸化物の濃度を知るこ
とができる。Therefore, from the difference between the measurement result by the former oxygen pump 4 (concentration of oxygen in simple oxygen + nitrogen oxides) and the measurement result by the latter oxygen sensor 7 (concentration of simple oxygen), it is found that the oxygen present as nitrogen oxides You can find the concentration of
The concentration of nitrogen oxides in the gas to be measured can be determined from the results.
［発明の効果］
以上説明したように、本発明の装置によれば、酸素ポン
プの両電極間に印加する電圧を０．５Ｖ以下に押えたの
で、窒素酸化物のみの濃度を測定することができる。ま
た、酸素ポンプによる酸素の汲み出し量を電流計で測定
するようにしているので、低コスト化を図ることができ
る。[Effects of the Invention] As explained above, according to the apparatus of the present invention, since the voltage applied between the two electrodes of the oxygen pump is suppressed to 0.5 V or less, it is possible to measure the concentration of only nitrogen oxides. can. Furthermore, since the amount of oxygen pumped by the oxygen pump is measured by an ammeter, it is possible to reduce costs.
図面は本発明の一実施例の縦断面図である。
１・・・・・・セル、２・・・・・・被測定ガスの流通
する管、３・・・・・・小孔、４・・・・・・酸素ポン
プ、７・・・・・・酸素センサ、４Ａ、７Ａ・・・・・
・酸素イオン伝導性固体電解質、４［３，４Ｃ，７Ｂ、
７Ｃ・・・・・・多孔質電極、５・・・・・直流電源、
６・・・・・・電流３１．８・・・・・・電圧計。The drawing is a longitudinal sectional view of an embodiment of the present invention. 1... Cell, 2... Tube through which the gas to be measured flows, 3... Small hole, 4... Oxygen pump, 7...・Oxygen sensor, 4A, 7A...
・Oxygen ion conductive solid electrolyte, 4[3,4C,7B,
7C...Porous electrode, 5...DC power supply,
6...Current 31.8...Voltmeter.
Claims (1)
を配設して、酸素ポンプ及び酸素センサをそれぞれに構
成し、 上記酸素ポンプを、被測定ガスの流入を拡散律速により
制限する小孔を有したセルの壁に設けて、それにより該
酸素ポンプの一方の電極をセル内部に、また他方の電極
を大気または被測定ガス中にそれぞれ臨ませ、 そして上記酸素ポンプのセル内部側の電極を直流電源の
マイナス極、他方の電極を同直流電源のプラス極に接続
して両電極間に０．５Ｖ以下の電圧を印加するよう構成
すると共に、 この電圧印加回路中に、酸素ポンプの両電極間を流れる
電流値を測定する電流計を接続し、一方、上記酸素セン
サを、被測定ガスと大気とを隔てる壁に設けて、一方の
電極を被測定ガス中に、また他方の電極を大気中にそれ
ぞれ臨ませ、そして該酸素センサの両電極間に電圧計を
接続した ことを特徴とする窒素酸化物濃度測定装置。[Claims] A pair of porous electrodes are disposed on both sides of an oxygen ion conductive solid electrolyte to constitute an oxygen pump and an oxygen sensor, respectively, and the oxygen pump is used to diffuse the inflow of a gas to be measured. The oxygen pump is provided in the wall of the cell with a small hole that is rate-limiting, so that one electrode of the oxygen pump faces inside the cell and the other electrode faces the atmosphere or the gas to be measured. The electrode on the inside of the cell is connected to the negative pole of a DC power supply, and the other electrode is connected to the positive pole of the same DC power supply, so that a voltage of 0.5 V or less is applied between both electrodes, and in this voltage application circuit. An ammeter that measures the current flowing between both electrodes of the oxygen pump is connected to the oxygen pump, and the oxygen sensor is installed on the wall separating the gas to be measured from the atmosphere, with one electrode placed in the gas to be measured. , and the other electrode faces the atmosphere, and a voltmeter is connected between both electrodes of the oxygen sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1334845A JPH03195962A (en) | 1989-12-26 | 1989-12-26 | Nitrogen oxide concentration measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1334845A JPH03195962A (en) | 1989-12-26 | 1989-12-26 | Nitrogen oxide concentration measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03195962A true JPH03195962A (en) | 1991-08-27 |
Family
ID=18281863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1334845A Pending JPH03195962A (en) | 1989-12-26 | 1989-12-26 | Nitrogen oxide concentration measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03195962A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277751A (en) * | 1988-04-30 | 1989-11-08 | Ngk Insulators Ltd | Measuring device of concentration of nox |
-
1989
- 1989-12-26 JP JP1334845A patent/JPH03195962A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277751A (en) * | 1988-04-30 | 1989-11-08 | Ngk Insulators Ltd | Measuring device of concentration of nox |
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