CN102798481A - Cold junction compensation temperature measurement method of thermocouple - Google Patents
Cold junction compensation temperature measurement method of thermocouple Download PDFInfo
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- CN102798481A CN102798481A CN2012103005648A CN201210300564A CN102798481A CN 102798481 A CN102798481 A CN 102798481A CN 2012103005648 A CN2012103005648 A CN 2012103005648A CN 201210300564 A CN201210300564 A CN 201210300564A CN 102798481 A CN102798481 A CN 102798481A
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- thermocouple
- cold junction
- junction
- thermopair
- temperature measurement
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Abstract
The invention discloses a cold junction compensation temperature measurement method of a thermocouple, which belongs to the technical field of thermocouple temperature measurement and is used for solving the problem of high temperature measurement cost caused by the high cost of a compensation conductor used in the thermocouple temperature measurement. According to the method, based on a temperature measurement loop formed by the thermocouple and a measurement instrument, a cold junction compensator is connected between a cold junction of the thermocouple and the measurement instrument in series and is used for respectively detecting a pressure drop change value of the cold junction compensator and an electric potential change value of the cold junction of the thermocouple; and when the two change values are the same, the measurement temperature of the thermocouple is obtained through computation according to the electric potential of the cold junction of the thermocouple. The method provided by the invention is suitable for the cold junction compensation of thermocouple temperature measurement.
Description
Technical field
The present invention relates to a kind of The Cold-Junction Compensation for Thermocouple temp measuring method, belong to the thermocouple temperature measurement technical field.
Background technology
When using thermocouple temperature measurement, need to use special compensating wire to extend thermode, promptly move the cold junction of thermopair, to constitute temp measuring system with measurement instrument.Because the common price of compensating wire is higher, make that the cost of thermocouple temperature measurement is high.
Summary of the invention
The present invention be when solving thermocouple temperature measurement because the compensating wire price of using is high, cause the high problem of thermometric cost, a kind of The Cold-Junction Compensation for Thermocouple temp measuring method is provided.
The Cold-Junction Compensation for Thermocouple temp measuring method according to the invention; It is based on the thermometric loop of thermopair and measurement instrument formation; It is connected on junction compensator between the cold junction and measurement instrument of thermopair; Detect the change in pressure drop value of junction compensator and the potential change value of thermocouple cold junction respectively, when the two changing value is identical, calculates according to the electromotive force of thermocouple cold junction and to obtain the measured temperature of thermopair.
Said measurement instrument is pointer instrument or read out instrument.
Advantage of the present invention is: the present invention reaches the purpose of cold junction compensation through the mode that between the cold junction of thermopair and measurement instrument, increases junction compensator; It is communicated with lead only need adopt inexpensive plain conductor; Such as copper core or aluminium core, will reach high-precision temperature-measuring results.
The present invention can reduce the high cost of each point for measuring temperature using compensation lead for the user of measurement instrument, therefore brings very high economic benefit.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Embodiment
Embodiment one: this embodiment is described below in conjunction with Fig. 1; The said The Cold-Junction Compensation for Thermocouple temp measuring method of this embodiment; It is based on the thermometric loop that thermopair 1 and measurement instrument 2 form, and it is connected on junction compensator 3 between the cold junction and measurement instrument 2 of thermopair 1, detects the change in pressure drop value of junction compensator 3 and the potential change value of thermopair 1 cold junction respectively; When the two changing value is identical, calculates according to the electromotive force of thermopair 1 cold junction and to obtain the measured temperature of thermopair 1.
In temperature control system, thermopair is a kind of important sensor.Because the thermoelectrical potential that thermopair produced depends on the temperature difference at its two ends, therefore, only when the temperature of its cold junction keeps constant; The thermoelectrical potential of its output could be calculated and obtain the measuring junction temperature; The scale of the general thermometric Displaying Meter that uses all is 0 ℃ according to thermocouple cold junction and is provided with constantly, because that the family curve of thermopair has is certain non-linear, therefore; Need its cold junction temperature compensated and proofread and correct that it is non-linear, could guarantee the measuring accuracy of thermopair.
Principle of work: junction compensator 3 is used with supporting measurement instrument 2 in this embodiment; Junction compensator 3 is serially connected with between the wiring of positive terminal and measurement instrument 2 of thermopair 1; At this moment; The electric current I that measurement instrument 2 provides produces on junction compensator 3, and the pressure drop that this electric current I forms changes with the residing variation of ambient temperature of thermopair 1 cold junction, when this pressure drop change amount just in time is worth when identical with thermopair 1 cold junction potential change; The potential value of junction compensator 3 outputs is just irrelevant with the cold junction environment temperature, thereby has reached the purpose of cold junction compensation.The positive terminal of thermopair 1 is its cold junction.
Embodiment two: this embodiment is for to the further specifying of embodiment one, and said measurement instrument 2 is pointer instrument or read out instrument.
Claims (2)
1. The Cold-Junction Compensation for Thermocouple temp measuring method; The thermometric loop that it forms based on thermopair (1) and measurement instrument (2); It is characterized in that: it is connected on junction compensator (3) between the cold junction and measurement instrument (2) of thermopair (1); Detect the change in pressure drop value of junction compensator (3) and the potential change value of thermopair (1) cold junction respectively, when the two changing value is identical, calculates according to the electromotive force of thermopair (1) cold junction and to obtain the measured temperature of thermopair (1).
2. The Cold-Junction Compensation for Thermocouple temp measuring method according to claim 1 is characterized in that: said measurement instrument (2) is pointer instrument or read out instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103005648A CN102798481A (en) | 2012-08-22 | 2012-08-22 | Cold junction compensation temperature measurement method of thermocouple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103005648A CN102798481A (en) | 2012-08-22 | 2012-08-22 | Cold junction compensation temperature measurement method of thermocouple |
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| CN102798481A true CN102798481A (en) | 2012-11-28 |
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| CN2012103005648A Pending CN102798481A (en) | 2012-08-22 | 2012-08-22 | Cold junction compensation temperature measurement method of thermocouple |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389169A (en) * | 2013-07-24 | 2013-11-13 | 浙江泰索科技有限公司 | Thermocouple cold junction compensation type combined socket connector |
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
| CN106248239A (en) * | 2016-08-12 | 2016-12-21 | 安徽中杰信息科技有限公司 | Dangerous materials temperature acquisition compensation method |
| GB2557351A (en) * | 2016-12-08 | 2018-06-20 | Continental Automotive Gmbh | Method for measuring an absolute temperature at a hot-end side of a thermocouple element and measuring device comprising the thermocouple element |
| CN108645530A (en) * | 2018-06-15 | 2018-10-12 | 芜湖美的厨卫电器制造有限公司 | Temp measuring system and the method for measuring temperature measuring area temperature using temp measuring system |
| CN108801488A (en) * | 2018-04-11 | 2018-11-13 | 北京强度环境研究所 | A kind of thermocouple temperature measurement cold junction compensation system |
| CN111912539A (en) * | 2020-08-14 | 2020-11-10 | 北京优航机电技术有限公司 | K-type thermocouple nonlinear correction method based on double fitting algorithm |
| CN112729583A (en) * | 2019-10-14 | 2021-04-30 | 中电智能科技有限公司 | SPARC microcontroller-based thermocouple type analog input module |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234085Y (en) * | 1995-08-08 | 1996-08-28 | 胡渭标 | Thermocouple cold junction temperature compensation circuit |
| CN101539461A (en) * | 2008-03-17 | 2009-09-23 | 鸿富锦精密工业（深圳）有限公司 | Multichannel thermocouple temperature acquisition system and method thereof |
-
2012
- 2012-08-22 CN CN2012103005648A patent/CN102798481A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234085Y (en) * | 1995-08-08 | 1996-08-28 | 胡渭标 | Thermocouple cold junction temperature compensation circuit |
| CN101539461A (en) * | 2008-03-17 | 2009-09-23 | 鸿富锦精密工业（深圳）有限公司 | Multichannel thermocouple temperature acquisition system and method thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389169A (en) * | 2013-07-24 | 2013-11-13 | 浙江泰索科技有限公司 | Thermocouple cold junction compensation type combined socket connector |
| CN103389169B (en) * | 2013-07-24 | 2015-06-24 | 浙江泰索科技有限公司 | Thermocouple cold junction compensation type combined socket connector |
| CN105651409A (en) * | 2016-04-06 | 2016-06-08 | 中国南方航空工业(集团)有限公司 | Thermocouple cold junction compensation and temperature measurement circuit and device |
| CN105651409B (en) * | 2016-04-06 | 2018-11-16 | 中国南方航空工业(集团)有限公司 | Cold junction compensation temperature measurement circuit and device |
| CN106248239A (en) * | 2016-08-12 | 2016-12-21 | 安徽中杰信息科技有限公司 | Dangerous materials temperature acquisition compensation method |
| GB2557351A (en) * | 2016-12-08 | 2018-06-20 | Continental Automotive Gmbh | Method for measuring an absolute temperature at a hot-end side of a thermocouple element and measuring device comprising the thermocouple element |
| CN108801488A (en) * | 2018-04-11 | 2018-11-13 | 北京强度环境研究所 | A kind of thermocouple temperature measurement cold junction compensation system |
| CN108645530A (en) * | 2018-06-15 | 2018-10-12 | 芜湖美的厨卫电器制造有限公司 | Temp measuring system and the method for measuring temperature measuring area temperature using temp measuring system |
| CN108645530B (en) * | 2018-06-15 | 2024-02-20 | 芜湖美的厨卫电器制造有限公司 | Temperature measuring system and method for measuring temperature of temperature measuring area by using same |
| CN112729583A (en) * | 2019-10-14 | 2021-04-30 | 中电智能科技有限公司 | SPARC microcontroller-based thermocouple type analog input module |
| CN111912539A (en) * | 2020-08-14 | 2020-11-10 | 北京优航机电技术有限公司 | K-type thermocouple nonlinear correction method based on double fitting algorithm |
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Application publication date: 20121128 |