JPH04166758A - Method and apparatus for measuring concentration of oxygen in fused metal - Google Patents
Method and apparatus for measuring concentration of oxygen in fused metalInfo
- Publication number
- JPH04166758A JPH04166758A JP2292760A JP29276090A JPH04166758A JP H04166758 A JPH04166758 A JP H04166758A JP 2292760 A JP2292760 A JP 2292760A JP 29276090 A JP29276090 A JP 29276090A JP H04166758 A JPH04166758 A JP H04166758A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- oxygen concentration
- probe
- oxygen probe
- measured
- 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 76
- 239000001301 oxygen Substances 0.000 title claims abstract description 75
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 8
- 239000000523 sample Substances 0.000 claims abstract description 34
- 239000011261 inert gas Substances 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052802 copper Inorganic materials 0.000 abstract description 14
- 239000010949 copper Substances 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 5
- 150000004706 metal oxides Chemical class 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000007784 solid electrolyte Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 2
- 229910000480 nickel oxide Inorganic materials 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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］
本発明は溶融金属中の酸素濃度を測定する方法及び装置
に関し、特に酸素濃淡電池の起電力値によって連続的に
酸素濃度を測定する溶融金属中の酸素濃度測定方法及び
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for measuring oxygen concentration in molten metal, and particularly to molten metal in which oxygen concentration is continuously measured by the electromotive force value of an oxygen concentration battery. The present invention relates to a method and device for measuring oxygen concentration inside.
（従来の技術）
鋳造加工時の熔融金属、特に導電材料として用いられる
タフピンチ胴中の酸素濃度は成形品の特性や加工性を左
右する重要な要因である。このため、鋳造時の溶銅中の
酸素濃度を連続的又は断続的に測定し、これに基づいて
酸素濃度を適正な値に制御している。(Prior Art) The oxygen concentration in the molten metal during casting, especially in the tough pinch barrel used as a conductive material, is an important factor that influences the properties and workability of the molded product. For this reason, the oxygen concentration in molten copper during casting is measured continuously or intermittently, and based on this, the oxygen concentration is controlled to an appropriate value.
第２図には、従来の酸素濃度測定装置１０が示されてい
る。この装置１０は、酸素濃淡電池を形成する電気化学
的原理に基づくものであり、被測定対象である溶銅２６
中に先端を挿入された酸素検出部（酸素プローブ）１２
と、この酸素プローブ１２の外殻１３とリード線１６と
に接続された電圧計１４と、酸素プローブ１２の外殻１
３の周囲に装着されたセラミック類の保護管１８とから
構成されている。リード線１６の先端は、内部に標準極
として金属、金属酸化物２０が充填された固体電解質２
２の底部に固定されている。固体電解質２２はセメント
２４によって酸素プローブ１２内に固定されている。す
なわち、酸素濃度（活量）が一定の標準極２０を酸素イ
オンが通過する固体電解質２２で挟み、被測定体の溶銅
２６と標準極２０の間に発生する酸素濃淡電池の起電力
値を電圧計１４で測定することにより、溶鋼２６中の酸
素濃度を測定するようになっている。FIG. 2 shows a conventional oxygen concentration measuring device 10. As shown in FIG. This device 10 is based on the electrochemical principle of forming an oxygen concentration battery, and is based on the molten copper 26 to be measured.
Oxygen detection unit (oxygen probe) 12 with the tip inserted inside
, a voltmeter 14 connected to the outer shell 13 of the oxygen probe 12 and the lead wire 16, and the outer shell 1 of the oxygen probe 12.
3 and a ceramic protection tube 18 attached around the holder. The tip of the lead wire 16 is connected to a solid electrolyte 2 filled with a metal or metal oxide 20 as a standard electrode.
It is fixed to the bottom of 2. Solid electrolyte 22 is fixed within oxygen probe 12 by cement 24 . That is, a standard electrode 20 with a constant oxygen concentration (activity) is sandwiched between solid electrolytes 22 through which oxygen ions pass, and the electromotive force value of the oxygen concentration battery generated between the molten copper 26 of the object to be measured and the standard electrode 20 is calculated. By measuring with the voltmeter 14, the oxygen concentration in the molten steel 26 is measured.
保護管１８は、溶鋼中の酸素濃度の正確な測定を行うた
めに設けられたものであり、酸素プローブ１２を溶銅２
６中に挿入して電圧測定を行っている間、酸素プローブ
１２の周囲の高温雰囲気によって当該プローブ１２の外
殻１３や内部のリード線１６が酸化、損耗し、溶鋼中の
酸素濃度の測定に悪影響が及ぶのを緩和する。また、特
開昭５８−２２３７４２号公報にも、セラミック保護管
を用いたものが開示されている。The protection tube 18 is provided to accurately measure the oxygen concentration in molten steel, and connects the oxygen probe 12 to the molten copper 2.
6, the outer shell 13 and internal lead wire 16 of the oxygen probe 12 are oxidized and worn out due to the high temperature atmosphere surrounding the oxygen probe 12, and the oxygen concentration in the molten steel cannot be measured. Mitigating negative impacts. Further, Japanese Patent Application Laid-Open No. 58-223742 also discloses a device using a ceramic protection tube.
〔発明が解決しようとする課題〕
しかし、上記のような従来の酸素濃度測定装置において
は、セラミック製の保護管１８により、酸素プローブ１
２の外殻１３や内部のリード線１６の酸化、損耗はある
程度緩和されるが、これには限界があり、約８時間後に
は外部の熱が酸素プローブ１２の内部に浸透し、精度の
高い測定を長時間続けることが困難となる。[Problems to be Solved by the Invention] However, in the conventional oxygen concentration measuring device as described above, the oxygen probe 1 is
Oxidation and wear and tear on the outer shell 13 and the internal lead wires 16 of the oxygen probe 12 are alleviated to some extent, but there is a limit to this, and after about 8 hours, the external heat penetrates into the inside of the oxygen probe 12, resulting in a highly accurate It becomes difficult to continue measurements for a long time.
本発明は係る点に鑑みて成されたものであり、長時間に
渡り精度の高い測定を安定して行い得る溶融金属中の酸
素濃度測定方法及び装置を提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a method and apparatus for measuring oxygen concentration in molten metal that can stably perform highly accurate measurements over a long period of time.
〔課題を解決するための手段］
上記目的を達成するために、本発明に係る溶融金属中の
酸素濃度測定方法及び装置においては、測定中の酸素プ
ローブ内に不活性ガスを注入している。[Means for Solving the Problems] In order to achieve the above object, in the method and apparatus for measuring oxygen concentration in molten metal according to the present invention, an inert gas is injected into the oxygen probe during measurement.
以上のように、本発明においては酸素プローブ内に不活
性ガスを注入しているため、不活性ガスにより酸素プロ
ーブ内の高温空気が外部に排出され、更に不活性ガスに
より酸素プローブ内が冷却される。これにより、酸素プ
ローブの外殻やその内部に配置されたリード線等の酸化
、損耗が防止される。As described above, in the present invention, since the inert gas is injected into the oxygen probe, the high temperature air inside the oxygen probe is exhausted to the outside by the inert gas, and the inside of the oxygen probe is further cooled by the inert gas. Ru. This prevents oxidation and wear of the outer shell of the oxygen probe and the lead wires disposed inside it.
以下、本発明の一実施例を添付図面を参照しつつ詳細に
説明する。なお、上記従来技術と同一部分の詳細は省略
する。Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that details of parts that are the same as those in the prior art described above will be omitted.
第１図には、実施例に係る溶融金属中の酸素濃度測定装
置３０の構成が示されている。この酸素濃度測定装置３
０は、上述した従来の装置１０と同様に被測定対象であ
る溶銅２６中に先端が侵入された酸素プローブ１２と、
この酸素プローブ１２の外殻１３とリード線１６とに接
続された電圧計１４と、酸素プローブ１２の外殻１３の
周囲に装着されたセラミック製の保護管１８とを含み、
更に酸素プローブ１２内に窒素ガス（Ｎ２）を注入する
ための注入パイプ３２を備えている。FIG. 1 shows the configuration of an apparatus 30 for measuring oxygen concentration in molten metal according to an embodiment. This oxygen concentration measuring device 3
0 is an oxygen probe 12 whose tip is inserted into the molten copper 26 that is the object to be measured, similar to the conventional device 10 described above;
It includes a voltmeter 14 connected to the outer shell 13 of the oxygen probe 12 and the lead wire 16, and a ceramic protection tube 18 attached around the outer shell 13 of the oxygen probe 12,
Furthermore, an injection pipe 32 for injecting nitrogen gas (N2) into the oxygen probe 12 is provided.
酸素プローブ１２は、片端を閉じたるつぼ状の固体電解
質２２と、この固体電解質２２の内側底部に固定された
ステンレス、白金等のリード線１６と、耐熱網等から成
る外殻１３とから構成される。固体電解質２２の内側に
は金属、金属酸化物２０が標準極として充填されている
。The oxygen probe 12 is composed of a crucible-shaped solid electrolyte 22 with one end closed, a lead wire 16 made of stainless steel, platinum, etc. fixed to the inner bottom of the solid electrolyte 22, and an outer shell 13 made of a heat-resistant net or the like. Ru. The inside of the solid electrolyte 22 is filled with metal or metal oxide 20 as a standard electrode.
金属、金属酸化物２０としては、 鉄と酸化鉄（Ｆｅ Ｆｅ０ｚ）。As the metal or metal oxide 20, Iron and iron oxide (Fe Fe0z).
ニッケルと酸化ニッケル（Ｎｉ−Ｎｉｐ）。Nickel and nickel oxide (Ni-Nip).
モリブデンと酸化モリブデン（ＭＯＭｏＯ□）。Molybdenum and molybdenum oxide (MOMoO□).
クロムと酸化クロム（Ｃ，−Ｃ，０３）等が用いられる
。Chromium, chromium oxide (C, -C, 03), etc. are used.
固体電解質２２は、酸素プローブ１２の外殻１３内にセ
メント２４によって固定されている。Solid electrolyte 22 is fixed within outer shell 13 of oxygen probe 12 by cement 24 .
固体電解質２２の材質としては、例えば、酸化マグネシ
ウム（Ｍ２Ｏ）。The material of the solid electrolyte 22 is, for example, magnesium oxide (M2O).
酸化イツトリウム（Ｙ２Ｏ２）。Yttrium oxide (Y2O2).
酸化カルシウム（Ｃ，Ｏ）等で安定化させたジルコニア
（Ｚ、Ｏ□）。Zirconia (Z, O□) stabilized with calcium oxide (C, O), etc.
酸化セリウム（Ｃ，０□）等が用いられる。Cerium oxide (C, 0□) or the like is used.
注入パイプ３２から注入する不活性ガスとしては、上述
した窒素ガス（ＮＺ）の他にヘリウム（Ｈｅ）等の冷却
機能を有する他の不活性ガスを用いても良い。As the inert gas injected from the injection pipe 32, in addition to the above-mentioned nitrogen gas (NZ), other inert gas having a cooling function such as helium (He) may be used.
以上のように構成された酸素濃度測定装置においては、
溶銅２６と標準極２０の間に発生する酸素濃淡電池の起
電力値を電圧計１４で測定する。In the oxygen concentration measuring device configured as above,
The electromotive force value of the oxygen concentration battery generated between the molten copper 26 and the standard electrode 20 is measured with the voltmeter 14.
溶銅２６と標準極２０間で発生する起電力が溶銅２６中
の酸素濃度に比例して変化するため、電圧計１４の計測
値により溶銅２６中の酸素濃度が測定される。この際、
注入パイプ３２から窒素ガスを注入し、酸素プローブ１
２内を冷却する。Since the electromotive force generated between the molten copper 26 and the standard electrode 20 changes in proportion to the oxygen concentration in the molten copper 26, the oxygen concentration in the molten copper 26 is measured by the measurement value of the voltmeter 14. On this occasion,
Inject nitrogen gas from the injection pipe 32 and connect the oxygen probe 1
Cool the inside of 2.
第１表には、上記実施例に係る装置（第１図）と、従来
の装置（第２図）の耐用時間の試験結果が示されている
。この試験は、酸素濃度測定を７０回行い、それぞれ何
時間まで正常にの測定を行えるかを調べたものである。Table 1 shows the test results of the service life of the device according to the above embodiment (FIG. 1) and the conventional device (FIG. 2). In this test, oxygen concentration was measured 70 times to determine how long the measurement could be performed normally for each time.
この試験の結果、本発明に係る酸素濃度測定装置の耐用
時間が、従来の装置に比べて著しく長いることが分かる
。これは、酸素プローブ１２への不活性ガスの注入によ
り、酸素プローブ１２内の空気が冷却され、酸素プロー
ブの外殻１３や内部のリード線１６の熱による酸化、損
耗が抑制されるためである。The results of this test show that the oxygen concentration measuring device according to the present invention has a significantly longer service life than conventional devices. This is because the air inside the oxygen probe 12 is cooled by injecting the inert gas into the oxygen probe 12, thereby suppressing oxidation and wear and tear of the outer shell 13 and internal lead wires 16 of the oxygen probe due to heat. .
第 １ 表Table 1
第１図は、本発明の一実施例に係る酸素濃度測定装置の
構成を示す継断面図である。第２図は、従来の酸素濃度
測定装置の構成を示す縦断面図である。
符号の説明
１２−・−一−−−−−−酸素プローブ１３−−−−−
一外殻
１４−−−一−−−電圧計
１８−＝−−−−保護管
２０−−−一金属、金属酸化物
２２−一一一一一 固体電解質
２４−−−−セメント
２６−−−− ／８銅
３０ −−一−−酸素濃度測定装置
３２−−−一窒素ガス注入パイプFIG. 1 is a cross-sectional view showing the configuration of an oxygen concentration measuring device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the configuration of a conventional oxygen concentration measuring device. Explanation of symbols 12--1-----Oxygen probe 13--
1 Outer shell 14---1---Voltmeter 18---=----Protection tube 20---1 Metal, metal oxide 22-1111 Solid electrolyte 24---Cement 26--- --/8 Copper 30 ---1--Oxygen concentration measuring device 32--1 Nitrogen gas injection pipe
Claims (2)
金属中の酸素濃度を測定する溶融金属中の酸素濃度測定
方法において、 前記酸素プローブの内部に不活性ガスを注入しつつ酸素
濃度の測定を行うことを特徴とする溶融金属中の酸素濃
度測定方法。(1) In a method for measuring oxygen concentration in molten metal in which a cylindrical oxygen probe is inserted into the molten metal to measure the oxygen concentration in the molten metal, the oxygen concentration is measured while injecting an inert gas into the inside of the oxygen probe. 1. A method for measuring oxygen concentration in molten metal, the method comprising: measuring oxygen concentration in molten metal.
金属中の酸素濃度を測定する溶融金属中の酸素濃度測定
装置において、 前記酸素プローブの内部に不活性ガスを注入するガス注
入手段を備えたことを特徴とする溶融金属中の酸素濃度
測定装置。(2) In a molten metal oxygen concentration measuring device that measures the oxygen concentration in the molten metal by inserting a cylindrical oxygen probe into the molten metal, a gas injection means for injecting an inert gas into the inside of the oxygen probe. An apparatus for measuring oxygen concentration in molten metal, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2292760A JPH04166758A (en) | 1990-10-30 | 1990-10-30 | Method and apparatus for measuring concentration of oxygen in fused metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2292760A JPH04166758A (en) | 1990-10-30 | 1990-10-30 | Method and apparatus for measuring concentration of oxygen in fused metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04166758A true JPH04166758A (en) | 1992-06-12 |
Family
ID=17785981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2292760A Pending JPH04166758A (en) | 1990-10-30 | 1990-10-30 | Method and apparatus for measuring concentration of oxygen in fused metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04166758A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006226966A (en) * | 2005-02-21 | 2006-08-31 | Mitsui Eng & Shipbuild Co Ltd | Oxygen sensor |
| JP2006250577A (en) * | 2005-03-08 | 2006-09-21 | Mitsui Eng & Shipbuild Co Ltd | Oxygen concentration sensor |
| JP2007024732A (en) * | 2005-07-19 | 2007-02-01 | Tokyo Yogyo Co Ltd | Oxygen sensor for oxygen-free copper and method for selecting oxygen sensor for copper |
-
1990
- 1990-10-30 JP JP2292760A patent/JPH04166758A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006226966A (en) * | 2005-02-21 | 2006-08-31 | Mitsui Eng & Shipbuild Co Ltd | Oxygen sensor |
| JP4620487B2 (en) * | 2005-02-21 | 2011-01-26 | 三井造船株式会社 | Oxygen sensor |
| JP2006250577A (en) * | 2005-03-08 | 2006-09-21 | Mitsui Eng & Shipbuild Co Ltd | Oxygen concentration sensor |
| JP4620503B2 (en) * | 2005-03-08 | 2011-01-26 | 三井造船株式会社 | Oxygen concentration sensor |
| JP2007024732A (en) * | 2005-07-19 | 2007-02-01 | Tokyo Yogyo Co Ltd | Oxygen sensor for oxygen-free copper and method for selecting oxygen sensor for copper |
| JP4718264B2 (en) * | 2005-07-19 | 2011-07-06 | 東京窯業株式会社 | Oxygen sensor for oxygen-free copper |
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