JPH0572050A - Accuracy controlling method for thermocouple thermometer - Google Patents
Accuracy controlling method for thermocouple thermometerInfo
- Publication number
- JPH0572050A JPH0572050A JP26533891A JP26533891A JPH0572050A JP H0572050 A JPH0572050 A JP H0572050A JP 26533891 A JP26533891 A JP 26533891A JP 26533891 A JP26533891 A JP 26533891A JP H0572050 A JPH0572050 A JP H0572050A
- Authority
- JP
- Japan
- Prior art keywords
- thermocouple
- temperature
- thermometer
- cold junction
- thermocouple thermometer
- 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
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【0001】この発明は、溶融金属等のような高温材料
の温度測定に使用する熱電対測温計の精度管理方法に関
するものである。The present invention relates to a quality control method for a thermocouple thermometer used to measure the temperature of a high temperature material such as molten metal.
【0002】[0002]
【従来技術とその課題】従来から、溶融金属等の如き高
温材料の温度を連続的に測定する場合には一般に熱電対
測温計が使用されている。例えば、図3は連続鋳造時の
タンディシュ内溶鋼温度を連続測温するための熱電対測
温計の代表例を示しているが、この熱電対測温計は、タ
ンディシュ1内の溶鋼2へ浸漬された保護管3(一般に
はアルミナ黒鉛質耐火物製)に白金−白金ロジウム等の
熱電対の熱接点部を収容すると共に(保護管内の熱電対
には絶縁のためにアルミナセラミックス管等が外装され
る)、熱電対の冷接点に導線4を介して表示計器又は記
録計5を接続して構成されている。なお、熱電対の冷接
点と導線4との接続は保護管3の上端に設けられたタ−
ミナルボックス6で行い、かつタ−ミナルボックス6の
周辺は測温精度を確保すべくエア−,N2 ガス又はArガ
ス等の冷却ガスによって室温に冷却される。2. Description of the Related Art Conventionally, a thermocouple thermometer is generally used when continuously measuring the temperature of a high temperature material such as molten metal. For example, FIG. 3 shows a typical example of a thermocouple thermometer for continuously measuring the molten steel temperature in the tundish during continuous casting. The thermocouple thermometer is immersed in the molten steel 2 in the tundish 1. The protected contact tube 3 (generally made of alumina graphite refractory) accommodates the heat contact part of the thermocouple such as platinum-platinum rhodium (the thermocouple inside the protect tube is covered with an alumina ceramic tube for insulation). The display instrument or the recorder 5 is connected to the cold junction of the thermocouple via the lead wire 4. The connection between the cold junction of the thermocouple and the lead wire 4 is provided at the upper end of the protective tube 3.
The operation is performed in the terminal box 6, and the periphery of the terminal box 6 is cooled to room temperature by a cooling gas such as air, N 2 gas or Ar gas in order to ensure temperature measurement accuracy.
【0003】しかしながら、上述のような熱電対測温計
では、被測温材温度等の影響を受けて変化しやすいタ−
ミナルボックス6の温度(即ち冷接点の温度)を室温一
定に保持するため冷却ガスの送給量を変化・調節する必
要があるものの、送給量の調節を正確に行うことができ
ず、また「冷却ガスの出し忘れ」や「冷却ガス圧力の変
動」等といったトラブルにも影響されて高い測温精度を
安定して確保するのが非常に困難であるとの問題が指摘
されていた。However, in the thermocouple thermometer as described above, the temperature tends to change under the influence of the temperature of the material to be measured.
In order to keep the temperature of the minal box 6 (that is, the temperature of the cold junction) at a constant room temperature, it is necessary to change / adjust the amount of cooling gas to be fed, but the amount of feeding cannot be adjusted accurately. It has been pointed out that it is very difficult to stably secure high temperature measurement accuracy due to problems such as "forgetting to supply cooling gas" and "fluctuations in cooling gas pressure".
【0004】そのため、熱電対の冷接点を熱源(タンデ
ィシュや炉等)の上方から側方へ配置替えする手法が提
案されたが(特開昭62−28626号)、この場合に
は冷接点を熱源の上方から離す分だけ熱電対線を長くし
なければならないためコスト高を招き、工業的に満足で
きる手段とは言えなかった。もっとも、上記延長分を熱
電対線に代えて価格の比較的安い補償導線で代替した場
合にはコスト的な不利は或る程度緩和されるが、接続導
線が補償導線であったとしても或る温度以上に上昇する
と誤差の要因となり、やはり実用的な対策とは言えなか
った。Therefore, a method has been proposed in which the cold junction of the thermocouple is rearranged from above the heat source (tundish, furnace, etc.) (Japanese Patent Laid-Open No. 62-28626). Since the thermocouple wire has to be lengthened as much as it is separated from the upper side of the heat source, the cost is increased and it cannot be said to be an industrially satisfactory means. However, if the above-mentioned extension is replaced with a thermocouple wire and a compensating lead wire having a relatively low price is substituted, the cost disadvantage is alleviated to some extent, but even if the connecting lead wire is a compensating lead wire, When the temperature rises above the temperature, it causes an error, and it cannot be said to be a practical measure.
【0005】このようなことから、本発明が目的とした
のは、熱電対測温計に指摘されていた上記問題点を解消
し、熱電対測温計での温度測定に際して格別なコスト高
を招くことなく高い測温精度を安定して確保し得る簡易
な手段を確立することであった。In view of the above, the object of the present invention is to solve the above-mentioned problems pointed out in the thermocouple thermometer and to increase the cost significantly when measuring the temperature in the thermocouple thermometer. It was to establish a simple means that can stably ensure high temperature measurement accuracy without inviting.
【0006】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成すべく鋭意行われた本発明者等の研究結果に基づいて
完成されたものであり、「熱電対の熱接点を収容した保
護管を被測温材に接触させると共に、 該熱電対の冷接点
に導線を介して表示計器(ミリボルト計)又は記録計を
接続して成る熱電対測温計で温度測定を実施するに際
し、 前記冷接点部に温度計を配設して該冷接点部の温度
を管理することによって高い測温精度を安定して確保し
得るようにした点」に大きな特徴を有している。The present invention has been completed based on the results of research conducted by the inventors of the present invention, which have been earnestly conducted to achieve the above-mentioned object. When the tube is brought into contact with the temperature-measuring material, and the temperature is measured by a thermocouple thermometer comprising a display instrument (millivolt meter) or a recorder connected to the cold junction of the thermocouple via a conductor, It has a great feature in that a thermometer is provided in the cold junction portion and the temperature of the cold junction portion is controlled so that a high temperature measurement accuracy can be stably ensured. "
【0007】以下、実施例に基づいて、本発明をその作
用及び効果と共により詳細に説明する。図1は、本発明
に係わる温度測定手段を“高炉から出銑した溶銑の連続
測温”に適用した状況の概要説明図であり、図2は使用
した熱電対測温計の要部(熱接点部及び冷接点部)説明
である。Hereinafter, the present invention will be described in more detail along with its operation and effects based on the embodiments. FIG. 1 is a schematic explanatory diagram of a situation in which the temperature measuring means according to the present invention is applied to “continuous temperature measurement of hot metal tapped from a blast furnace”, and FIG. 2 is a main part (thermometer) of a thermocouple thermometer used. Contact part and cold contact part).
【0008】図1及び図2において、被測温材たる“高
炉より出銑した溶銑”11には、スキンマ−カバ−12に固
定された支持管13により支持されて下端封じのアルミナ
黒鉛質耐火物製保護管14が浸漬されている。保護管14は
熱電対による溶銑の連続的測温を可能とするために必要
なものであり、該保護管14内には白金−白金ロジウム熱
電対15が収容されている。なお、熱電対15にはこれを保
護管14等から電気的に絶縁するためにアルミナセラミッ
クス等から成る磁製管16が外装されている。そして、支
持管13の上端にはタ−ミナルボックス17が装着されてお
り、熱電対線の上端(冷接点)はタ−ミナルボックス17
に取付けられた“熱電対15と表示計器又は記録計18とを
連結するコネクタ−”18に接続されている。In FIGS. 1 and 2, an alumina graphite refractory having a lower end supported by a support pipe 13 fixed to a skin cover 12 is attached to a "hot metal discharged from a blast furnace" 11 which is a temperature-measured material. The product protection tube 14 is immersed. The protection tube 14 is necessary to enable continuous temperature measurement of the hot metal by the thermocouple, and the protection tube 14 contains a platinum-platinum rhodium thermocouple 15. The thermocouple 15 is provided with a porcelain tube 16 made of alumina ceramics or the like to electrically insulate the thermocouple 15 from the protective tube 14 and the like. A terminal box 17 is attached to the upper end of the support tube 13, and the upper end (cold junction) of the thermocouple wire is attached to the terminal box 17.
It is connected to the "connector for connecting the thermocouple 15 and the display meter or recorder 18" attached to the "18".
【0009】ここで特徴としているのは、図2で示され
るようにコネクタ−18の熱電対線側におけるピン数を3
ピン仕様とし、熱電対線の一端が接続されたピンの1つ
から残る空きピンに銅製の短絡線19を入れると共に、コ
ネクタ−18の表示計器又は記録計側では熱電対線の一端
が接続されたピンにそれぞれ銅製の導線20,20を接続
し、また短絡線19の入ったピンにはコンスタンタン(60%
Cu−40%Ni)製の導線21を接続して、これら各導線の他端
を何れも表示計器(ミリボルト計)又は記録計22に接続
した点である。The feature here is that the number of pins on the thermocouple wire side of the connector-18 is 3 as shown in FIG.
With pin specifications, insert a copper short-circuit wire 19 into an empty pin remaining from one of the pins to which one end of the thermocouple wire is connected, and connect one end of the thermocouple wire to the display instrument or recorder side of the connector-18. The copper pins 20 and 20 are connected to the pins, and the pin containing the short-circuit line 19 has a constantan (60%
Cu-40% Ni) conducting wires 21 are connected, and the other end of each of these conducting wires is connected to a display meter (millivolt meter) or recorder 22.
【0010】このため、銅製導線20の一方とコンスタン
タン製導線21とは、タ−ミナルボックス17内の短絡線19
の入ったコネクタ−ピンを熱接点とした銅−コンスタン
タン熱電対を構成することになる。それ故、上記熱電対
測温計では、表示計器又は記録計22によって溶銑11の温
度(白金−白金ロジウム熱電対15の熱起電力)のみか、
白金−白金ロジウム熱電対15の冷接点部(タ−ミナルボ
ックス17部)の温度(導線20の一方と導線21とで構成さ
れる銅−コンスタンタン熱電対の熱起電力)をも連続的
に監視・記録することができる。Therefore, one of the copper conductors 20 and the constantan conductor 21 is connected to the short-circuit wire 19 in the terminal box 17.
Thus, a copper-constantan thermocouple with the connector pin containing the above as a thermal contact will be constructed. Therefore, in the above thermocouple thermometer, only the temperature of the hot metal 11 (platinum-thermoelectromotive force of the platinum-rhodium rhodium thermocouple 15) is indicated by the display instrument or the recorder 22.
Continuously monitors the temperature of the cold junction (terminal box 17) of the platinum-platinum-rhodium thermocouple 15 (thermoelectromotive force of the copper-constantan thermocouple consisting of one of the conductors 20 and 21).・ It can be recorded.
【0011】ところで、上記銅−コンスタンタン熱電対
の出力は表示計器又は記録計22で監視するだけではな
く、図1に示したように警報装置23を取付けてそのリミ
ッタ−で常時監視し、上昇した場合にはランプもしくは
ブザ−出力等で警報を出すようにするのも好ましい手段
である。By the way, the output of the copper-constantan thermocouple is not only monitored by the display instrument or the recorder 22, but is also monitored by the limiter provided with the alarm device 23 as shown in FIG. In some cases, it is also a preferable means to issue an alarm with a lamp or buzzer output.
【0012】従って、上述の熱電対測温計を使用し、常
時、溶銑温度測定用熱電対のタ−ミナル部(冷接点部)
の温度を監視しつつ該温度を一定に保持しながら(変動
があった時は直ちに冷却ガスの調整を行えば良い)溶銑
温度の連続的測定を実施すれば、導線を3線式にする必
要性があるものの、それほど格別なコスト高を招くこと
なく高い測温精度を確保することができる。また、設備
的にもメンテナンスの容易な構成を採ることが可能であ
る。Therefore, using the thermocouple thermometer described above, the terminal portion (cold junction portion) of the thermocouple for measuring the hot metal temperature is always available.
If the temperature of the hot metal is kept constant while the temperature is kept constant (when there is a change, the cooling gas can be adjusted immediately), and if the continuous measurement of the hot metal temperature is carried out, it is necessary to use a three-wire conductor. However, high temperature measurement accuracy can be secured without incurring a particularly high cost. Moreover, it is possible to adopt a configuration that is easy to maintain in terms of equipment.
【0013】なお、本発明の適用対象たる被測温材は溶
銑,溶鋼等の溶融金属のみに限られるわけではなく、高
温用連続測温計を使用して測温がなされる何れの材料を
対象としても良いことは言うまでもない。また、測温用
熱電対の冷接点部温度の監視は必ずしも実施例で述べた
銅−コンスタンタン熱電対を構成して実施する必要はな
く、その他の測温抵抗体等を使用した温度感知感知手段
を配設して行っても何ら差支えはない。The material to be measured to which the present invention is applied is not limited to molten metal such as hot metal and molten steel, and any material whose temperature is measured by using a high temperature continuous thermometer can be used. It goes without saying that it can be a good target. Further, the monitoring of the cold junction temperature of the temperature-measuring thermocouple does not necessarily have to be performed by configuring the copper-constantan thermocouple described in the embodiment, and temperature sensing and sensing means using other resistance temperature detectors or the like. There is no problem even if the arrangement is made.
【0014】[0014]
【効果の総括】以上に説明した如く、この発明によれ
ば、測温用熱電対の冷接点部が温度計により常時管理さ
れることにより「冷却ガスの出し忘れ」や「冷却ガス圧
の変動」等に的確に対処することができ、これにより冷
接点部の温度を一定に保持することが容易となって熱電
対測温計の測温精度,信頼性が大幅に向上するなど、産
業上有用な効果がもたらされる。[Summary of Effects] As described above, according to the present invention, the cold junction portion of the thermocouple for temperature measurement is constantly managed by the thermometer so that "forgetting to supply cooling gas" and "fluctuation of cooling gas pressure". It is easy to keep the temperature of the cold junction constant, which greatly improves the temperature measurement accuracy and reliability of the thermocouple thermometer. It has a useful effect.
【図1】本発明に係わる温度測定手段を“高炉から出銑
した溶銑の連続測温”に適用した状況の概要説明図であ
る。FIG. 1 is a schematic explanatory view of a situation in which a temperature measuring means according to the present invention is applied to “continuous temperature measurement of hot metal tapped from a blast furnace”.
【図2】図1に係わる使用熱電対測温計の要部(熱接点
部及び冷接点部)説明である。FIG. 2 is a description of essential parts (hot contact part and cold contact part) of the thermocouple thermometer used in FIG.
【図3】熱電対測温計によるタンディシュ内溶鋼温度の
従来の測定手法に関する説明図である。FIG. 3 is an explanatory diagram of a conventional method for measuring a molten steel temperature in a tundish by a thermocouple thermometer.
1 タンディシュ 2 溶鋼 3 保護管 4 導線 5 表示計器又は記録計 6 タ−ミナルボックス 11 溶銑 12 スキンマ−カバ− 13 支持管 14 保護管 15 熱電対 16 磁製管 17 タ−ミナルボックス 18 コネクタ− 19 銅製短絡線 20 銅製導線 21 コンスタンタン製導線 22 表示計器又は記録計 23 警報装置 1 Tundish 2 Molten steel 3 Protective tube 4 Conductor wire 5 Display instrument or recorder 6 Terminal box 11 Hot metal 12 Skinmer cover 13 Support tube 14 Protective tube 15 Thermocouple 16 Magnetic tube 17 Terminal box 18 Connector-19 Copper Short-circuit wire 20 Copper conductor wire 21 Constantan conductor wire 22 Indicator or recorder 23 Alarm device
Claims (1)
温材に接触させると共に、該熱電対の冷接点に導線を介
して表示計器又は記録計を接続して成る熱電対測温計で
温度測定を実施するに際し、前記冷接点部に温度計を配
設して該冷接点部の温度を管理することを特徴とする、
熱電対測温計の精度管理方法。1. A thermocouple temperature measuring device comprising a protective tube accommodating a thermocontact of a thermocouple in contact with a material to be measured, and a cold junction of the thermocouple connected to a display instrument or a recorder through a lead wire. When performing temperature measurement with a meter, the temperature of the cold junction is controlled by disposing a thermometer on the cold junction.
Accuracy control method of thermocouple thermometer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26533891A JPH0572050A (en) | 1991-09-17 | 1991-09-17 | Accuracy controlling method for thermocouple thermometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26533891A JPH0572050A (en) | 1991-09-17 | 1991-09-17 | Accuracy controlling method for thermocouple thermometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0572050A true JPH0572050A (en) | 1993-03-23 |
Family
ID=17415801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26533891A Pending JPH0572050A (en) | 1991-09-17 | 1991-09-17 | Accuracy controlling method for thermocouple thermometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0572050A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006170692A (en) * | 2004-12-14 | 2006-06-29 | Toho Titanium Co Ltd | Thermometer for measuring temperature in chlorination furnace |
CN102749145A (en) * | 2012-03-26 | 2012-10-24 | 宝山钢铁股份有限公司 | Detecting device and detecting control method for heat of refine electric furnace electrode cross arm |
CN103148951A (en) * | 2011-12-06 | 2013-06-12 | 沈阳特种设备检测研究院 | Temperature measurement system of outdoor remote-control destructive test device for gas cylinders |
-
1991
- 1991-09-17 JP JP26533891A patent/JPH0572050A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006170692A (en) * | 2004-12-14 | 2006-06-29 | Toho Titanium Co Ltd | Thermometer for measuring temperature in chlorination furnace |
CN103148951A (en) * | 2011-12-06 | 2013-06-12 | 沈阳特种设备检测研究院 | Temperature measurement system of outdoor remote-control destructive test device for gas cylinders |
CN102749145A (en) * | 2012-03-26 | 2012-10-24 | 宝山钢铁股份有限公司 | Detecting device and detecting control method for heat of refine electric furnace electrode cross arm |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3463005A (en) | Immersion molten metal sampler device | |
US3797310A (en) | Temperature sensing device | |
US4643586A (en) | Equipment and method for calibration of instruments having a temperature sensing unit | |
JPH11316106A (en) | Method and device for continuous measurement of abrasion amount of metallurgic container wall | |
US4863283A (en) | Thermocouple connector | |
PL76636B1 (en) | ||
US3580078A (en) | Thermocouple failure indicating device | |
US4995733A (en) | Measurement sensor for the detection of temperatures in metal or alloy melts | |
JPH0572050A (en) | Accuracy controlling method for thermocouple thermometer | |
JPS6237331B2 (en) | ||
US5184894A (en) | Method of using an immersible air cooled thermocouple | |
JPS61153555A (en) | Method and device for detecting presence of substance or generation of change immediately before physical state change in fluid | |
JPH01299423A (en) | Protective-tube type meter for continuous temperature measurement | |
US6577118B2 (en) | System and method for measuring liquid metal levels or the like | |
JPH05346352A (en) | Low temperature junction compensation device for thermocouple | |
US3954508A (en) | High temperature thermocouple probe | |
JPH10325759A (en) | Temperature sensor | |
Bedford | Reference tables for platinum 20% Rhodium/Platinum 5% Rhodium thermocouples | |
EP0243097B1 (en) | Improvements in thermocouples | |
JPS6228626A (en) | Continuous temperature measuring meter for molten metal | |
JPS641625Y2 (en) | ||
Van der Perre | Temperature measurement in liquid metal | |
CN220853918U (en) | Thermocouple temperature measuring device | |
CN219099382U (en) | Single crystal furnace | |
JP3069031B2 (en) | Heat flux measuring device |