JPS61251918A - Temperature controller - Google Patents
Temperature controllerInfo
- Publication number
- JPS61251918A JPS61251918A JP9421785A JP9421785A JPS61251918A JP S61251918 A JPS61251918 A JP S61251918A JP 9421785 A JP9421785 A JP 9421785A JP 9421785 A JP9421785 A JP 9421785A JP S61251918 A JPS61251918 A JP S61251918A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermocouple
- amplifier
- heat source
- output value
- 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
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 abstract description 6
- 239000004020 conductor Substances 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract 2
- 238000006731 degradation reaction Methods 0.000 abstract 2
- 238000004861 thermometry Methods 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は温度調節装置に係り、特に測温用熱電対の他に
参照用熱電対を併存せしめることにより、測温用熱電対
及びこれに接続される補償導線の劣化や、これらの中継
接続点における接触不良の有無を検出する機能を備えた
温度調節装置に関する。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a temperature control device, and in particular, a thermocouple for temperature measurement and connection thereto by coexisting a reference thermocouple in addition to a thermocouple for temperature measurement. The present invention relates to a temperature control device having a function of detecting deterioration of compensating conducting wires and the presence or absence of poor contact at these relay connection points.
［発明の技術的背景］
従来から第３図に示したような温度調節装置が知られて
いる。この種温度調節装置１は、雰囲気を所望の温度に
する熱源２と、その雰囲気中に配された測温用熱電対３
と、該測温用熱電対３に接続された補償導線４と、該補
償導線４に接続されていて制御量としての雰囲気温度と
目標値としての設定温度とを比較して制御偏差を検出す
る温度調節計５と、該制御偏差を零にするように熱源２
の加熱度合を制御する熱源制御器６とで構成されている
。このような構成では、測温用熱電対３若しくは補償導
線４の断線の有無は、温度指示計（図示せず）の指示が
スケールアウトしているか否かで判定される。[Technical Background of the Invention] A temperature control device as shown in FIG. 3 is conventionally known. This type of temperature control device 1 includes a heat source 2 that brings the atmosphere to a desired temperature, and a temperature measuring thermocouple 3 placed in the atmosphere.
A compensating lead wire 4 connected to the temperature measuring thermocouple 3 is compared with the ambient temperature connected to the compensating lead wire 4 as a controlled variable and a set temperature as a target value to detect a control deviation. A temperature controller 5 and a heat source 2 so as to reduce the control deviation to zero.
and a heat source controller 6 that controls the degree of heating. In such a configuration, whether or not the temperature measuring thermocouple 3 or the compensation lead wire 4 is disconnected is determined by whether or not the indication from the temperature indicator (not shown) is out of scale.
［背景技術の問題点］
しかしながら、従来における温度調節装置では、測温用
熱電対若しくは補償導線の劣化、又は中継接続点におけ
る接触不良に伴なう接触抵抗の増大があってもこれを知
り得ないという問題点を有している。更に上記状態を回
避せんとして時々測温用熱電対を取り外して恒温槽に入
れ、相対測定で得られる温度と絶対測定で得られる温度
とを比較し１両値が一致しているか否かを判定せねばな
らず、作業工数が増大するという問題点を有している。[Problems in the Background Art] However, with conventional temperature control devices, it is difficult to detect deterioration of the thermocouple for temperature measurement or compensation conductor, or increase in contact resistance due to poor contact at the relay connection point. The problem is that there is no Furthermore, in order to avoid the above situation, we sometimes remove the temperature measuring thermocouple and place it in a constant temperature bath, and compare the temperature obtained by relative measurement with the temperature obtained by absolute measurement to determine whether the two values match. This poses a problem in that the number of man-hours required increases.
［発明の目的］
本発明は叙上の問題点に鑑みてなされたもので、測温用
熱電対異常検出機能を備えた温度調節装置を提供するこ
とを目的とする。[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a temperature control device having a temperature measuring thermocouple abnormality detection function.
［発明の概要］
この目的を達成するために本発明の温度調節装置によれ
ば、雰囲気を所望の温度にする熱源と、該熱源によって
加熱された雰囲気中に配された測温用熱電対と、該測温
用熱電対と同一の温度−起電力特性を有していてその測
定接点が該測温用熱電対の測定接点近傍に配された参照
用熱電対と。[Summary of the Invention] In order to achieve this object, the temperature control device of the present invention includes a heat source that brings the atmosphere to a desired temperature, a temperature measuring thermocouple disposed in the atmosphere heated by the heat source, and , a reference thermocouple having the same temperature-electromotive force characteristics as the temperature-measuring thermocouple, and whose measuring contacts are arranged near the measuring contacts of the temperature-measuring thermocouple;
前記測温用熱電対の基準接点に接続された第１の増幅器
と、該第１の増幅器と同一の増幅度を有していて前記参
照用熱電対の基準接点に接続された第２の増幅器と、制
御量としての前記第１の増幅器の出力値と目標値として
の温度設定値とを比較して制御偏差を検出する制御偏差
検出器と、該制御偏差検出器で検出された制御偏差が零
になるように熱源の加熱度合を制御する熱源制御器と、
前記第１の増幅器の出力値と前記第２の増幅器の出力値
とを比較して偏差を検出する比較器と、該比較器で検出
された偏差が許容し得る上下限設定範囲内にあるか否か
を判別する弁別器とを具備したものである。a first amplifier connected to the reference junction of the temperature measuring thermocouple; and a second amplifier having the same amplification as the first amplifier and connected to the reference junction of the reference thermocouple. a control deviation detector that detects a control deviation by comparing an output value of the first amplifier as a controlled variable and a temperature set value as a target value; a heat source controller that controls the heating degree of the heat source so that the heating level becomes zero;
a comparator that detects a deviation by comparing the output value of the first amplifier and the output value of the second amplifier; and whether the deviation detected by the comparator is within an allowable upper and lower limit setting range. The device is equipped with a discriminator that determines whether the
［発明の実施例コ 本発明の好ましい実施例を第１図を参照して詳述する。[Embodiments of the invention] A preferred embodiment of the invention will be described in detail with reference to FIG.
本発明の温度調節装置１１は、熱源１２、測温用熱電対
１３、参照用熱電対１４、第１の増幅器１５、第２の増
幅器１６、制御偏差検出器１７、熱源制御器１８、比較
器１９．弁別器２０と内蔵リレー２１とで形成されてい
る。先づ熱源１２は、雰囲気を所望の温度にすべく加熱
される発熱体である。測温用熱電対１３は、該熱源１２
によって加熱された雰囲気中に配されている。参照用熱
電対１４は、該測温用熱電対１３と同一の温度−起電力
特性を有していて、その測定接点Ｂが該測温用熱電対１
３の測定接点Ａ近傍に配されている。所定の増幅度を有
する第１の増幅器１５は、前記測温用熱電対１３の基準
接点Ａ′に接続されている。第２の増幅器１６は、該第
１の増幅器１５と同一の増幅度を有していて前記参照用
熱電対１４の基準接点Ｂ′に接続されている。制御偏差
検出器１７は、制御量としての前記第１の増幅器１５の
出力値と目標値としての可変可能な温度設定値とを比較
して制御偏差を検出するものである。The temperature control device 11 of the present invention includes a heat source 12, a temperature measuring thermocouple 13, a reference thermocouple 14, a first amplifier 15, a second amplifier 16, a control deviation detector 17, a heat source controller 18, and a comparator. 19. It is formed by a discriminator 20 and a built-in relay 21. First, the heat source 12 is a heating element that heats the atmosphere to a desired temperature. The temperature measuring thermocouple 13 is connected to the heat source 12
placed in an atmosphere heated by The reference thermocouple 14 has the same temperature-electromotive force characteristics as the temperature measuring thermocouple 13, and its measurement contact B is the same as that of the temperature measuring thermocouple 13.
It is placed near the measurement contact A of No. 3. A first amplifier 15 having a predetermined amplification degree is connected to the reference junction A' of the temperature measuring thermocouple 13. The second amplifier 16 has the same amplification degree as the first amplifier 15 and is connected to the reference junction B' of the reference thermocouple 14. The control deviation detector 17 detects a control deviation by comparing the output value of the first amplifier 15 as a control amount with a variable temperature setting value as a target value.
熱源制御器１８は、該制御偏差検出器１７で検出された
制御偏差が零になるように熱源１２の加熱度合を制御す
るものである。比較器１９は、前記第１の増幅器１５の
出力値と前記第２の増幅器１６の出力値とを比較して偏
差を検出するものである。弁別器２０は、該比較器１９
で検出された偏差が許容し得る可変可能な上下限設定範
囲の内にあるか否かを判別するものである。また内蔵リ
レー２１は、該弁別器２０の出力に接続されていてＯＮ
、ＯＦＦするものであり警報器（図示せず）を駆動する
ものである。この場合において測温用熱電対１３と参照
用熱電対１４は、第２図に示すように同一の容器中に封
入されて使用される。The heat source controller 18 controls the degree of heating of the heat source 12 so that the control deviation detected by the control deviation detector 17 becomes zero. The comparator 19 compares the output value of the first amplifier 15 and the output value of the second amplifier 16 to detect a deviation. The discriminator 20 is the comparator 19
It is determined whether or not the detected deviation is within an allowable variable upper and lower limit setting range. Also, the built-in relay 21 is connected to the output of the discriminator 20 and is turned on.
, which turns off and drives an alarm (not shown). In this case, the thermocouple 13 for temperature measurement and the thermocouple 14 for reference are used while being sealed in the same container as shown in FIG.
以上のように構成された本発明の温度調節装置の動作を
第１図を基に説明する。この温度調節装置１１は、一般
的な温度調節機能と測温用熱電対異常検出機能とを備え
ている。ここで雰囲気の温度を調節する場合においては
、先づ測温用熱電対１３の基準接点Ａ′に現われる起電
力を第１の増幅器１５で増幅して制御偏差検出器１７に
出力する。制御偏差検出器１７では温度設定値と第１の
−６＝
増幅器１５の出力値とを比較してその電圧差を制御偏差
として出力する。次いでこの制御偏差は熱源制御器１８
に入力され、その制御偏差に見合った分だけ熱源１２を
加熱することになる。すると雰囲気の温度が変化して第
１の増幅器１５の出力値と温度設定値との差、即ち、制
御偏差が小さくなる方向に収束することになる。最終的
にはこの制御偏差が零になって温度設定値と雰囲気の温
度とが同一値を呈することになる。The operation of the temperature control device of the present invention configured as above will be explained based on FIG. 1. This temperature control device 11 has a general temperature control function and a temperature measuring thermocouple abnormality detection function. When adjusting the temperature of the atmosphere, first the electromotive force appearing at the reference junction A' of the temperature measuring thermocouple 13 is amplified by the first amplifier 15 and output to the control deviation detector 17. The control deviation detector 17 compares the temperature set value and the output value of the first -6=amplifier 15 and outputs the voltage difference as a control deviation. This control deviation is then determined by the heat source controller 18.
is input, and the heat source 12 is heated by an amount commensurate with the control deviation. Then, the temperature of the atmosphere changes, and the difference between the output value of the first amplifier 15 and the temperature setting value, that is, the control deviation, converges in the direction of decreasing. Eventually, this control deviation becomes zero, and the temperature set value and the ambient temperature take on the same value.
また測温用熱電対の異常を検出する場合においては、先
づ第１の増幅器１５と第２の増幅器１６の増幅度が同一
であることを前提とする。そして参照用熱雷対１４が劣
化していないものと仮定する。この状態では測温用熱電
対１３が劣化していなければ測定用熱電対１３と参照用
熱電対１４の温度−起電力特性が合致している関係から
比較器１９の入力へは同一電圧の２つの出力値ａＶ、
ｂＶが現われてくる。その為に比較器１９の出力へは差
引零となった出力値
ａＶ−ｂＶ＝ΔｄＶ＝ＯＶ
即ち偏差零の出力値が現われる。すると弁別器２０の上
下限設定値子ΔｅＶ、−八ｆＶが雰に設定されることは
あり得ないから弁別器２０の出力値もＯｖであって内蔵
リレー２１を作動させ得ない。その結果、現に使用され
ている測温用熱電対１３が正常であると解される。けれ
ども測温用熱電対１３が劣化しているとすると、測温用
熱電対１３と参照用熱電対１４の温度−起電力特性が異
なるものとなるので、比較器１９の出力へは、
ａＶ −ｂＶ ＝ΔｄＶ≠Ｏｖ
という偏差を有する出力値が現われる。そこでこの偏差
ΔｄＶが弁別器２０の上限設定値△ｅＶより大きい場合
、即ち△ｄＶ＞△ｅ’Ｖである場合、又は偏差△ｄＶが
弁別器２０の下限設定値△ｆＶより小さい場合、即ちΔ
ｄＶ＜−ΔｆＶである場合には、弁別器２０の出力値は
Ｏｖであり得す、内蔵リレー２１を作動させることにな
る。その結果警報器（図示せず）を作動せしめて測定用
熱電対１３が劣化しているとの報を発することになる。Furthermore, when detecting an abnormality in the temperature measuring thermocouple, it is first assumed that the first amplifier 15 and the second amplifier 16 have the same amplification degree. It is assumed that the reference thermal lightning pair 14 has not deteriorated. In this state, if the temperature measuring thermocouple 13 has not deteriorated, the temperature-electromotive force characteristics of the measuring thermocouple 13 and the reference thermocouple 14 match, so that two of the same voltages are input to the input of the comparator 19. output value aV,
bV appears. Therefore, the output value of the comparator 19 appears as an output value aV-bV=ΔdV=OV, that is, an output value of zero deviation. Then, since it is impossible for the upper and lower limit setting values ΔeV and -8fV of the discriminator 20 to be set to Ov, the output value of the discriminator 20 is also Ov, and the built-in relay 21 cannot be activated. As a result, it is determined that the temperature measuring thermocouple 13 currently in use is normal. However, if the temperature measuring thermocouple 13 has deteriorated, the temperature-electromotive force characteristics of the temperature measuring thermocouple 13 and the reference thermocouple 14 will be different, so the output of the comparator 19 will be aV − An output value appears with a deviation of bV = ΔdV≠Ov. Therefore, if this deviation ΔdV is larger than the upper limit set value ΔeV of the discriminator 20, that is, ΔdV>Δe'V, or if the deviation ΔdV is smaller than the lower limit set value ΔfV of the discriminator 20, that is, Δ
If dV<-ΔfV, the output value of the discriminator 20 can be Ov, which will activate the built-in relay 21. As a result, an alarm (not shown) is activated to issue a report that the measuring thermocouple 13 has deteriorated.
［発明の効果］
以上の実施例からも明らかなように本発明の温度調節装
置によれば、測温用熱電対は雰囲気を所望の温度にする
熱源によって加熱された雰囲気中に配されており、参照
用熱電対は該測温用熱電対と同一の温度−起電力特性を
有していてその測定接点が該測温用熱電対の測定接点近
傍に配されており、第２の増幅器は前記測温用熱電対の
基準接点に接続された第１の増幅器と同一の増幅度を有
していて前記参照用熱電対の基準接点に接続されており
、熱源制御器は制御量としての前記第１の増幅器の出力
値と目標値としての温度設定値とを比較して制御偏差を
検出する制御偏差検出器で検出された制御偏差を零にす
べく熱源の加熱度合を制御しており、比較器は前記第１
の増幅器の出力値と前記第２の増幅器の出力値とを比較
して偏差を検出し、弁別器は比較器で検出された偏差が
許容し得る上下限設定範囲内にあるか否かを判別するよ
うに構成したので、測定用熱電対の異常、即ち測定用熱
電対の劣化、補償導線の劣化、これらの中継接続点にお
ける接触不良の有無を検出でき一〇−
るという効果を奏する。[Effects of the Invention] As is clear from the above embodiments, according to the temperature control device of the present invention, the temperature measuring thermocouple is placed in an atmosphere heated by a heat source that brings the atmosphere to a desired temperature. , the reference thermocouple has the same temperature-electromotive force characteristics as the temperature-measuring thermocouple, and its measurement junction is placed near the measurement junction of the temperature-measuring thermocouple, and the second amplifier The heat source controller has the same amplification degree as the first amplifier connected to the reference junction of the temperature measuring thermocouple and is connected to the reference junction of the reference thermocouple, The heating degree of the heat source is controlled to zero the control deviation detected by the control deviation detector which detects the control deviation by comparing the output value of the first amplifier and the temperature set value as the target value, The comparator is the first
A deviation is detected by comparing the output value of the amplifier and the output value of the second amplifier, and the discriminator determines whether the deviation detected by the comparator is within an allowable upper and lower limit setting range. With this structure, it is possible to detect an abnormality in the measuring thermocouple, that is, deterioration of the measuring thermocouple, deterioration of the compensating conductor, and the presence or absence of poor contact at the relay connection point of these.
第１図は本発明による温度調節装置のブロック図、第２
図は本発明の温度調節装置で用いられる測温用熱電対と
参照用熱電対とを収納した容器の平面図、第３図は従来
における温度調節装置のブロック図である。
１１ ・・・・・・・・温度調節装置
１２・・・・・・・・熱源
１３ ・・・・・・・・測温用熱電対
１４ ・・・・・・・・参照用熱電対
１５・・・・・・・・第１の増幅器
１６ ・・・・・・・・第２の増幅器
１７ ・・・・・・・・制御偏差検出器１８ ・・・・
・・・・熱源制御器
１９・・・・・・・・比較器
２０ ・・・・・・・・弁別器FIG. 1 is a block diagram of a temperature control device according to the present invention, and FIG.
The figure is a plan view of a container housing a temperature measuring thermocouple and a reference thermocouple used in the temperature control device of the present invention, and FIG. 3 is a block diagram of a conventional temperature control device. 11 ...... Temperature control device 12 ... Heat source 13 ...... Temperature measuring thermocouple 14 ...... Reference thermocouple 15 .....First amplifier 16 .....Second amplifier 17 .....Control deviation detector 18 .....
...Heat source controller 19 ...Comparator 20 ...Discriminator
Claims (1)
された雰囲気中に配された測温用熱電対と、該測温用熱
電対と同一の温度−起電力特性を有していてその測定接
点が該測温用熱電対の測定接点近傍に配された参照用熱
電対と、前記測温用熱電対の基準接点に接続された第１
の増幅器と、該第１の増幅器と同一の増幅度を有してい
て前記参照用熱電対の基準接点に接続された第２の増幅
器と、制御量としての前記第１の増幅器の出力値と目標
値としての温度設定値とを比較して制御偏差を検出する
制御偏差検出器と、該制御偏差検出器で検出された制御
偏差が零になるように熱源の加熱度合を制御する熱源制
御器と、前記第１の増幅器の出力値と前記第２の増幅器
の出力値とを比較して偏差を検出する比較器と、該比較
器で検出された偏差が許容し得る上下限設定範囲内にあ
るか否かを判別する弁別器とを具備したことを特徴とす
る温度調節装置。A heat source that brings the atmosphere to a desired temperature, a temperature measuring thermocouple disposed in the atmosphere heated by the heat source, and having the same temperature-electromotive force characteristics as the temperature measuring thermocouple. A reference thermocouple whose measurement junction is arranged near the measurement junction of the temperature measurement thermocouple, and a first reference thermocouple whose measurement junction is connected to the reference junction of the temperature measurement thermocouple.
an amplifier, a second amplifier having the same amplification as the first amplifier and connected to the reference junction of the reference thermocouple, and an output value of the first amplifier as a controlled variable; A control deviation detector that detects a control deviation by comparing the temperature set value as a target value, and a heat source controller that controls the heating degree of the heat source so that the control deviation detected by the control deviation detector becomes zero. a comparator that detects a deviation by comparing the output value of the first amplifier and the output value of the second amplifier; and a comparator that detects a deviation by comparing the output value of the first amplifier and the output value of the second amplifier; 1. A temperature control device comprising: a discriminator for determining whether or not the temperature is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9421785A JPS61251918A (en) | 1985-04-30 | 1985-04-30 | Temperature controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9421785A JPS61251918A (en) | 1985-04-30 | 1985-04-30 | Temperature controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61251918A true JPS61251918A (en) | 1986-11-08 |
Family
ID=14104147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9421785A Pending JPS61251918A (en) | 1985-04-30 | 1985-04-30 | Temperature controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61251918A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0580861A (en) * | 1991-09-19 | 1993-04-02 | Nec Yamagata Ltd | Temperature control circuit |
| US5618459A (en) * | 1993-11-04 | 1997-04-08 | Nec Corporation | High-speed bus apparatus with cooling means |
| JP2001343290A (en) * | 2000-06-05 | 2001-12-14 | Ulvac Japan Ltd | Vacuum heating device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4875276A (en) * | 1972-01-12 | 1973-10-11 |
-
1985
- 1985-04-30 JP JP9421785A patent/JPS61251918A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4875276A (en) * | 1972-01-12 | 1973-10-11 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0580861A (en) * | 1991-09-19 | 1993-04-02 | Nec Yamagata Ltd | Temperature control circuit |
| US5618459A (en) * | 1993-11-04 | 1997-04-08 | Nec Corporation | High-speed bus apparatus with cooling means |
| JP2001343290A (en) * | 2000-06-05 | 2001-12-14 | Ulvac Japan Ltd | Vacuum heating device |
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