JPH06129914A - Temperature measuring apparatus - Google Patents
Temperature measuring apparatusInfo
- Publication number
- JPH06129914A JPH06129914A JP30454192A JP30454192A JPH06129914A JP H06129914 A JPH06129914 A JP H06129914A JP 30454192 A JP30454192 A JP 30454192A JP 30454192 A JP30454192 A JP 30454192A JP H06129914 A JPH06129914 A JP H06129914A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermocouple
- temperature sensor
- sensor
- cold
- 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】[0001]
【産業上の利用分野】この発明は，自動車のエンジンル
−ムや食料品店その他野外における温度監視の際に，熱
電対を用いて温度を検出する温度測定装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for detecting a temperature by using a thermocouple during temperature monitoring in an engine room of an automobile, a grocery store or the like.
【０００２】[0002]
【従来の技術】従来，自動車のエンジンル−ムやその他
温度変動の激しい場所において温度監視する場合，温度
を検出する手段として熱電対が用いられているととも
に，この熱電対による測定温度を補償するために，温度
センサを用いた補償回路が組み込まれた温度測定装置が
ある。この温度測定装置１における熱電対２は，図６に
示すように，２種の金属線，例えば，クロメルＣとアル
メルＡとが接合されており，２種類の金属のそれぞれ他
端には，黄銅で形成されたピンの周囲を錫メッキした入
力端子４，５が接続されている。熱電対２の一端，即
ち，２種類の金属の接合点は熱接点３となり，他端，即
ち，２種類の金属の末端には，入力端子４，５がそれぞ
れ接続されており，この接合点はそれぞれ冷接点６，７
となっている。2. Description of the Related Art Conventionally, when temperature is monitored in an engine room of an automobile or other places where the temperature fluctuates greatly, a thermocouple has been used as a means for detecting the temperature, and the temperature measured by this thermocouple is compensated. Therefore, there is a temperature measurement device that incorporates a compensation circuit that uses a temperature sensor. As shown in FIG. 6, the thermocouple 2 in this temperature measuring device 1 has two kinds of metal wires, for example, chromel C and alumel A, joined to each other. The input terminals 4 and 5 which are tin-plated around the pins formed in (4) are connected. One end of the thermocouple 2, that is, the joining point of the two kinds of metal serves as the heat contact 3, and the other end, that is, the end of the two kinds of metal, is connected with the input terminals 4 and 5, respectively. Are cold junctions 6 and 7, respectively
Has become.
【０００３】入力端子４，５の他端は，プリント配線さ
れているプリント基板８の所定箇所に接続されていると
ともに，温度センサ９はプリント基板８上に実装されて
いる。入力端子４，５の一部分とプリント基板８および
補償用の温度センサ９とは，エポキシ樹脂等のモ−ルド
材１０によりモ−ルドされているとともに，金属容器１
１に収納されている。The other ends of the input terminals 4 and 5 are connected to a predetermined portion of the printed circuit board 8 on which printed wiring is provided, and the temperature sensor 9 is mounted on the printed circuit board 8. A part of the input terminals 4, 5 and the printed circuit board 8 and the temperature sensor 9 for compensation are molded by a molding material 10 such as an epoxy resin, and the metal container 1
It is stored in 1.
【０００４】[0004]
【発明が解決しようとする問題点】このように構成され
ているので，熱接点３の温度をＴ1 ，冷接点６，７の温
度をＴ2 ，温度センサ９の温度をＴ0 であったとする
と，その時の測定温度Ｔは，Ｔ＝Ｔ1 −Ｔ2 ＋Ｔ0 で表
される。一方，温度補償用の温度センサ９は，モ−ルド
材１０によりモ−ルドされており，図５に示すように，
外部環境温度が２５℃から１２５℃まで変動した時の温
度特性は，定常状態，即ち，±１℃程度の安定状態にな
るまでに約２０分程度の時間が必要である。Because of the structure as described above, it is assumed that the temperature of the hot junction 3 is T 1 , the temperature of the cold junctions 6 and 7 is T 2 , and the temperature of the temperature sensor 9 is T 0. Then, the measured temperature T at that time is represented by T = T 1 −T 2 + T 0 . On the other hand, the temperature sensor 9 for temperature compensation is molded by the molding material 10, and as shown in FIG.
When the external environment temperature fluctuates from 25 ° C. to 125 ° C., it takes about 20 minutes to reach a steady state, that is, a stable state of about ± 1 ° C.
【０００５】一方，温度センサ９は金属容器１１内にお
いてモ−ルド材１０によりモ−ルドされているのに対
し，冷接点６，７は露出して外気にふれた状態である。
従って，冷接点６，７と温度センサ９との環境温度が異
なるため，温度センサ９の温度Ｔ0 と冷接点６，７の温
度Ｔ2 との間の温度時定数が大きくなる。従って，風等
により熱電対２の外部環境温度が変動すると，この温度
変動に温度センサ９が追従することができなくなる。On the other hand, the temperature sensor 9 is molded in the metal container 11 by the molding material 10, whereas the cold junctions 6 and 7 are exposed and exposed to the outside air.
Therefore, since the environmental temperature of the cold junction 6, 7 and the temperature sensor 9 are different, the temperature time constant of between a temperature T 2 of the temperature T 0 and a cold junction 6 of the temperature sensor 9 is increased. Therefore, if the external environmental temperature of the thermocouple 2 fluctuates due to wind or the like, the temperature sensor 9 cannot follow this temperature fluctuation.
【０００６】このように，熱電対２で検出される温度の
変動に温度センサ９がリアルタイムで追従することが出
来ない。そのため，実際の温度と測定温度Ｔとの誤差が
大きくなるという問題があった。As described above, the temperature sensor 9 cannot follow the temperature fluctuation detected by the thermocouple 2 in real time. Therefore, there is a problem that the error between the actual temperature and the measured temperature T becomes large.
【０００７】[0007]
【問題点を解決するための手段】この発明は，熱電対
と，この熱電対の入力端子と，熱電対の測定温度を補償
する温度センサとからなる温度測定装置において，入力
端子をそれぞれ熱電対と同一部材で形成するようにし
て，外部環境温度の変動による測定誤差をなくすように
したものである。SUMMARY OF THE INVENTION The present invention relates to a thermocouple, a thermocouple, an input terminal of the thermocouple, and a temperature sensor for compensating the temperature measured by the thermocouple. It is made of the same material as the above to eliminate measurement errors due to fluctuations in the external environment temperature.
【０００８】[0008]
【作用】熱電対の入力端子を熱電対を構成する部材と同
一部材で形成することにより，冷接点がこの入力端子の
先端部に位置することになり，温度センサで検出された
温度Ｔ0 と冷接点の温度Ｔ2 とがほぼ等しくなり，両者
間の温度時定数が小となり，従って，温度を正確に測定
することが出来る。By forming the input terminal of the thermocouple by the same member as the member forming the thermocouple, the cold junction is located at the tip of this input terminal, and the temperature T 0 detected by the temperature sensor The temperature T 2 of the cold junction becomes almost equal, and the temperature time constant between them becomes small, so that the temperature can be measured accurately.
【０００９】[0009]
【発明の実施例１】この発明の実施例を．図１〜図４に
基づいて詳細に説明する。図１はこの発明の実施例を示
す要部断面図，図２はプリント基板８の要部構成図，図
３はこの発明による温度測定装置２０の構成図，図４は
図３に示す温度測定装置２０における温度測定用増幅部
２３の詳細回路図である。なお，従来例と同一名称のも
のは同一符号で示し，その説明を省略する。Embodiment 1 of the present invention. This will be described in detail with reference to FIGS. FIG. 1 is a sectional view of the essential parts showing an embodiment of the present invention, FIG. 2 is a structural view of the essential parts of a printed circuit board 8, FIG. 3 is a structural view of a temperature measuring device 20 according to the present invention, and FIG. 6 is a detailed circuit diagram of a temperature measurement amplification unit 23 in the device 20. FIG. Incidentally, the same names as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.
【００１０】図１〜図２において，温度測定装置２０温
度センサ９と温度計測用増幅部２３とにより構成されて
おり，温度センサ９を構成する熱電対２は，従来例と同
様に，２種類の金属線，クロメルＣとアルメルＡとが接
合されており，接合点の一端は熱接点３となり，熱電対
２の他端には，それぞれ入力端子２１，２２の一端が接
続されている。２７は出力端子である。1 and 2, the temperature measuring device 20 comprises a temperature sensor 9 and a temperature measuring amplifying section 23. The thermocouple 2 constituting the temperature sensor 9 is of two types as in the conventional example. The metal wire, chromel C, and alumel A are joined, one end of the joining point becomes the thermal contact 3, and the other end of the thermocouple 2 is connected to one end of the input terminals 21 and 22, respectively. 27 is an output terminal.
【００１１】入力端子２１，２２は，熱電対２と同一部
材であるクロメルＣとアルメルＡとによりそれぞれ形成
されており，この入力端子２１，２２の他端は，プリン
ト配線されているプリント基板８の所定箇所に接続され
ているとともに，先端部は，冷接点６，７となってい
る。The input terminals 21 and 22 are formed of chromel C and alumel A, which are the same members as the thermocouple 2, respectively, and the other ends of the input terminals 21 and 22 are the printed circuit board 8 on which printed wiring is provided. Of the cold junctions 6 and 7 are connected to the predetermined points of the above.
【００１２】プリント基板８は，図２に示すように，温
度計測用増幅部２３および温度センサ９の配線部分がプ
リント配線されているとともに，各部品および各素子が
それぞれ所定箇所に実装されている。As shown in FIG. 2, the printed circuit board 8 has printed wirings for the temperature measuring amplification section 23 and the temperature sensor 9, and each component and each element are mounted at predetermined locations. .
【００１３】入力端子２１，２２の一部分とプリント基
板８および補償用の温度センサ９とは，従来例と同様
に，エポキシ樹脂等のモ−ルド材１０によりモ−ルドさ
れているとともに，金属容器１１に収納されて温度測定
装置２０が構成されている。A part of the input terminals 21 and 22, the printed circuit board 8 and the temperature sensor 9 for compensation are molded by a molding material 10 such as an epoxy resin as in the conventional example, and a metal container. The temperature measuring device 20 is configured by being housed in 11.
【００１４】図３は，この発明による温度測定装置２０
の要部構成図を示すもので，温度計測用増幅部２３は，
図４に詳細回路図を示すように，フィルタ部を含む差動
増幅部２４と温度センサ９を内蔵した冷接点補償回路２
５と加算増幅部２６とにより構成されている。FIG. 3 shows a temperature measuring device 20 according to the present invention.
The main part configuration diagram of the temperature measurement amplifier 23 is
As shown in the detailed circuit diagram of FIG. 4, a cold junction compensation circuit 2 including a differential amplifier 24 including a filter and a temperature sensor 9 is built in.
5 and the addition amplification unit 26.
【００１５】次に，作用動作について詳細に説明する。
まず，熱電対２の冷接点６，７は，従来のように，入力
端子４，５と熱電対２との接続点ではなく，入力端子２
１，２２の他端であるプリント基板８の接続点側に位置
することになる。そこで，熱接点３と冷接点６，７との
両接合点間に温度差があると，ゼ−ベック効果により熱
起電力が発生するから，この熱起電力（あるいは熱電
流）を検出して，温度測定が行われる。この際，冷接点
６，７は，温度補償用の温度センサ９の近傍に位置決め
されているとともに，モ−ルド材１０で包囲されている
ので，冷接点６，７の温度Ｔ2が，図５に示すように，
温度センサ９の温度特性とほぼ同じ温度時定数で変動す
る。Next, the operation and operation will be described in detail.
First, the cold junctions 6 and 7 of the thermocouple 2 are not the connecting points between the input terminals 4 and 5 and the thermocouple 2 as in the conventional case, but the input terminals 2
It will be located on the side of the connection point of the printed circuit board 8 which is the other end of 1, 2. Therefore, if there is a temperature difference between the junction points of the hot junction 3 and the cold junctions 6 and 7, a thermoelectromotive force is generated by the Zeebeck effect. Therefore, this thermoelectromotive force (or thermal current) is detected. , Temperature measurement is performed. At this time, since the cold junctions 6 and 7 are positioned near the temperature sensor 9 for temperature compensation and are surrounded by the molding material 10, the temperature T 2 of the cold junctions 6 and 7 is As shown in 5,
It fluctuates with a temperature time constant almost the same as the temperature characteristic of the temperature sensor 9.
【００１６】そこで，熱接点３の温度をＴ1 ，冷接点
６，７の温度をＴ2 ，温度センサ９の温度をＴ0 であっ
たとすると，その時の測定温度Ｔは，Ｔ＝Ｔ1 −Ｔ2 ＋
Ｔ0 で表されるが，この際，温度センサ９と熱電対２の
冷接点６，７とは，モ−ルド材１０中に位置しているの
で，Ｔ0 ≒Ｔ2 となり，冷接点６，７の温度はほぼ温度
センサ９の温度時定数に追従することになり，正確な測
定温度Ｔが得られる。Therefore, assuming that the temperature of the hot junction 3 is T 1 , the temperature of the cold junctions 6 and 7 is T 2 , and the temperature of the temperature sensor 9 is T 0 , the measured temperature T at that time is T = T 1 − T 2 +
Is represented by T 0, this time, the temperature sensor 9 and the thermocouple 2 cold junction 6,7, mode - so are located in field member 10, T 0 ≒ T 2, and the cold junction 6 , 7 substantially follow the temperature time constant of the temperature sensor 9, and an accurate measured temperature T can be obtained.
【００１７】そこで，熱電対２により検出された温度信
号は，図４に示すように，入力端２９，３０からそれぞ
れ差動増幅器３１の＋および−端子に入力して演算増幅
されその出力抵抗Ｒ01に出力される。一方，温度センサ
Ｚ1 により検出された冷接点補償用の温度信号は，差動
増幅器３２を介して出力抵抗Ｒ02に出力される。この差
動増幅器３１，３２からの２つの信号は，加算増幅部２
６において，加算増幅器３３により加算されて熱電対２
の冷接点６，７が補償される。この際，図１に示すよう
に，冷接点６，７は温度センサ９の近傍に位置している
とともに，モ−ルド材１０で包囲されているので，温度
センサ９で検出された測定温度Ｔ0 と冷接点の温度Ｔ2
との間の温度時定数が小となり，Ｔ0 ≒Ｔ2 となるの
で，温度センサ９による温度補償範囲が小さく，正確な
温度測定が出来る。Therefore, the temperature signal detected by the thermocouple 2 is input from the input terminals 29 and 30 to the + and-terminals of the differential amplifier 31 as shown in FIG. It is output to 01 . On the other hand, the temperature signal for cold junction compensation detected by the temperature sensor Z 1 is output to the output resistor R 02 via the differential amplifier 32. The two signals from the differential amplifiers 31 and 32 are added to the addition amplification unit 2
6, the thermocouple 2 is added by the adding amplifier 33.
The cold junctions 6 and 7 are compensated. At this time, as shown in FIG. 1, since the cold junctions 6 and 7 are located near the temperature sensor 9 and are surrounded by the molding material 10, the measured temperature T detected by the temperature sensor 9 is 0 and cold junction temperature T 2
Since the temperature time constant between and becomes small and T 0 ≈T 2 , the temperature compensation range by the temperature sensor 9 is small and accurate temperature measurement can be performed.
【００１８】[0018]
【発明の効果】この発明は，熱電対と，この熱電対の入
力端子と，熱電対の測定温度を補償する温度センサとか
らなる温度測定装置において，入力端子をそれぞれ熱電
対と同一部材で形成するようにしたので，熱電対の冷接
点と温度補償用の温度センサとの間の温度時定数が小と
なるから，測定誤差がそれだけ小さくなり，正確な温度
測定が可能である。その上，冷接点は温度センサの近傍
に位置しているとともに，モ−ルド材で包囲されている
ので，冷接点と温度センサとはその外部環境の影響が同
様となり，それだけ温度時定数が等しくなり，正確な温
度測定値が得られる。According to the present invention, in a temperature measuring device comprising a thermocouple, an input terminal of the thermocouple, and a temperature sensor for compensating the temperature measured by the thermocouple, the input terminals are formed of the same member as the thermocouple. By doing so, the temperature time constant between the cold junction of the thermocouple and the temperature sensor for temperature compensation becomes small, so the measurement error becomes smaller and accurate temperature measurement is possible. Moreover, since the cold junction is located near the temperature sensor and is surrounded by the molding material, the cold junction and the temperature sensor are affected by the same external environment, and the temperature time constant is equal. Therefore, an accurate temperature measurement value can be obtained.
【図１】この発明の実施例を示す要部断面図である。FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.
【図２】この発明の実施例で，プリント基板８の要部構
成図である。FIG. 2 is a configuration diagram of a main part of a printed circuit board 8 in an embodiment of the present invention.
【図３】この発明の実施例を示す要部構成図である。FIG. 3 is a main part configuration diagram showing an embodiment of the present invention.
【図４】この発明の実施例で，温度測定用増幅部２３の
詳細回路図である。FIG. 4 is a detailed circuit diagram of the temperature measuring amplifier unit 23 in the embodiment of the present invention.
【図５】温度センサの温度特性図である。FIG. 5 is a temperature characteristic diagram of a temperature sensor.
【図６】従来例を示す断面図である。FIG. 6 is a cross-sectional view showing a conventional example.
２ 熱電対 ６ 冷接点 ７ 冷接点 ９ 温度センサ １０ モ−ルド材 ２０ 温度測定装置 ２１ 熱電対２の入力端子 ２２ 熱電対２の入力端子 2 Thermocouple 6 Cold junction 7 Cold junction 9 Temperature sensor 10 Mold material 20 Temperature measuring device 21 Thermocouple 2 input terminal 22 Thermocouple 2 input terminal
Claims (2)
記熱電対の測定温度を補償する温度センサとからなる温
度測定装置において， 前記入力端子をそれぞれ前記熱電対と同一部材で形成し
たことを特徴とする温度測定装置。1. A temperature measuring device comprising a thermocouple, an input terminal of the thermocouple, and a temperature sensor for compensating the measured temperature of the thermocouple, wherein each of the input terminals is formed of the same member as the thermocouple. A temperature measuring device characterized in that
の近傍に位置決めするとともに，この入力端子の一部分
と前記温度センサとをモ−ルド材で包囲したことを特徴
とする請求項１に記載の温度測定装置。2. The input terminal of the thermocouple is positioned in the vicinity of the temperature sensor, and a part of the input terminal and the temperature sensor are surrounded by a molding material. Temperature measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30454192A JPH06129914A (en) | 1992-10-16 | 1992-10-16 | Temperature measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30454192A JPH06129914A (en) | 1992-10-16 | 1992-10-16 | Temperature measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06129914A true JPH06129914A (en) | 1994-05-13 |
Family
ID=17934248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30454192A Pending JPH06129914A (en) | 1992-10-16 | 1992-10-16 | Temperature measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06129914A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003038423A (en) * | 2001-07-26 | 2003-02-12 | Olympus Optical Co Ltd | Medical treatment device |
| KR20030031297A (en) * | 2001-10-13 | 2003-04-21 | 엘지전자 주식회사 | Temperature sensor using seebeck effect in mobile communication terminal unit |
| CN102156148A (en) * | 2010-02-02 | 2011-08-17 | 精工电子纳米科技有限公司 | Differential scanning calorimeter |
| WO2013142360A1 (en) * | 2012-03-22 | 2013-09-26 | Texas Instruments Incorporated | Heat sensor correction |
| KR101386594B1 (en) * | 2012-02-06 | 2014-04-17 | 한국과학기술원 | Implantable temperature sensor for micro device and method for manufacturing thereof |
| KR20210079109A (en) * | 2019-12-19 | 2021-06-29 | 알에스오토메이션주식회사 | Terminal Block Insert Type CJC Sensor Structure for Thermocouple Module of Industrial controller |
-
1992
- 1992-10-16 JP JP30454192A patent/JPH06129914A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003038423A (en) * | 2001-07-26 | 2003-02-12 | Olympus Optical Co Ltd | Medical treatment device |
| KR20030031297A (en) * | 2001-10-13 | 2003-04-21 | 엘지전자 주식회사 | Temperature sensor using seebeck effect in mobile communication terminal unit |
| CN102156148A (en) * | 2010-02-02 | 2011-08-17 | 精工电子纳米科技有限公司 | Differential scanning calorimeter |
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