CN2221207Y - Linear compensating device of thermal couple digital thermometer - Google Patents
Linear compensating device of thermal couple digital thermometer Download PDFInfo
- Publication number
- CN2221207Y CN2221207Y CN 94214506 CN94214506U CN2221207Y CN 2221207 Y CN2221207 Y CN 2221207Y CN 94214506 CN94214506 CN 94214506 CN 94214506 U CN94214506 U CN 94214506U CN 2221207 Y CN2221207 Y CN 2221207Y
- Authority
- CN
- China
- Prior art keywords
- pin
- potentiometer
- linear compensation
- branch road
- compensation
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
The utility model relates to the improvement of a linear compensating device of thermocouple thermometer, which is suitable for being used in K or E type thermocouples, and the utility model solves the problems of the existing linearity compensation such as multiple devices, complex line, high cost, inaccurate measurement, etc. The utility model mainly makes use of linearity compensation resistors R1, R2, a thermocouple and a zero potentiometer in series connection so as to form a linearity compensation branch, and the linearity compensation branch is connected with a three and a half analog digital converter TC7106/7107. Meanwhile, the linearity compensation branch can be combined with a potentiometer, a temperature compensation element and a cold end temperature compensation branch formed by resistors. The utility model has few utilization devices, simple lines, low cost, little nonlinearity error and stable performance, and the accuracy of the thermometer can reach +-0.5%+-1 in-30-900DEG. C.
Description
The utility model relates to a kind of improvement of thermocouple thermometer linear compensation device, is specially adapted to K type or E type thermopair.
In the prior art, K type (or E type) thermopair is at-30～900 ℃ of nonlinearity errons of 1% of having an appointment, and carry out the Exact Number thermometric needs it is done linear the correction.The method of piecewise linear approximation and software correction is generally arranged, and its deficiency is: use components and parts more, complex circuit is adjusted trouble, and the cost height is measured accurate inadequately etc.
The utility model purpose provides that a kind of use components and parts are few, and circuit is simple, the thermopair digital thermometer linear compensation device that the good linearity precision is higher.
The utility model is realized by the alignment compensating circuit, linear compensation resistance R
1, R
2And thermopair and zero potentiometer W
1, series connection forms the linear compensation branch road, passes through R
1, R
2Dividing potential drop to thermoelectrical potential changes reference voltage realization linearization, and these branch road two ends are connected R with positive source 1 pin of 31/2 analog to digital converter TC7106/7107 with common port 32 pin respectively
1With R
2Between node be connected R with converter 35 pin
2Be connected reference voltage potentiometer W with converter 31 pin with node between thermopair
2Two ends in parallel with the linear compensation branch road, potentiometer W
2Middle-end be connected temperature-compensated voltage regulator potentiometer W with converter 36 pin
3With after temperature compensating element in the cold junction compensation device is in parallel and R
3Series connection forms cold junction compensation branch road and in parallel with the linear compensation branch road, potentiometer W
3Middle-end be connected with converter 30 pin.Wherein temperature compensating element is silicon diode, triode or thermistor and other temperature compensating element.
The utility model embodiment accompanying drawings is as follows:
Fig. 1 thermopair digital thermometer linear compensation device circuit figure.
Fig. 2 cold junction compensation apparatus structure synoptic diagram.
As shown in Figure 1, resistance R
1, R
2With thermopair and potentiometer W
1Series connection forms the linear compensation branch road, and its two ends are connected R with the positive source pin one of 31/2 analog to digital converter TC7106/7107 with common port 32 pin
1With R
2Node connects converter 35 pin, R
2Be connected converter 31 pin with node between thermopair, potentiometer W
2Two ends are in parallel with the linear compensation branch road, W
2Middle-end connect converter 36 pin, W
3With after temperature compensating element in the cold junction compensation device is in parallel and R
3Series connection formation temperature compensation branch road is in parallel with linear branch, potentiometer W
3Middle-end connects converter 30 pin.Temperature compensating element is selected silicon three utmost points and the b utmost point and c utmost point short circuit for use in this example, as Fig. 1 (or connecting the b utmost point, the e utmost point, the disconnection of the c utmost point).
Described cold junction compensation device, as Fig. 2, be between two sheet rectangle copper-base boots A, temperature compensating element B to be housed by hot tie-in, (this example is a silicon triode), pole shoe one end connects K type or E type thermocouple wire, the other end seals in the linear compensation branch road, temperature compensating element (as silicon triode b, c utmost point short circuit) and potentiometer W
3Back in parallel and R
3Series connection.Described linear resistance R
1, R
2Sum is 2～100K Ω.
The utility model advantage: 1, use components and parts few, circuit is simple, and this circuit is only used two resistance R1、R
2Can realize linear compensation; 2, this linear compensation circuit makes non-line The property error is reduced to 0.5% by former 1%; 3, this circuit makes take K type or E type thermocouple to biography The digital thermometer of sensor reaches-30～900 ℃ the degree of accuracy ± 0.5% ± 1 numeral, Improve than the domestic similar accuracy of an instrument, and stable performance. Following table is for adopting this circuit system The five number of units word thermometer measured results of doing: Normal temperature ℃-30 0 100 200 300 400 500 600 700 800 900 Observed temperature ℃ Thermometer
01 -28 1 101 201 300 400 501 602 703 800 897
02 -27 1 100 200 301 400 501 602 702 801 897
03 -27 1?101?201?301?400?501?601?702?801?897
04 -27 1?100?200?301?400?500?601?702?801?897
05 -28 1?100?201?300?400?501?602?703?802?898。
Claims (4)
1, a kind of thermopair digital thermometer linear compensation device is characterized in that this compensation system is by following linear compensation circuit realization, linear compensation resistance R
1, R
2And thermopair and zero potentiometer W
1, series connection forms the linear compensation branch road, passes through R
1, R
2Dividing potential drop to thermoelectrical potential changes reference voltage realization linearization, and these branch road two ends are connected R with positive source 1 pin of 31/2 analog to digital converter TC7106/7107 with common port 32 pin respectively
1With R
2Between node be connected R with converter 35 pin
2Be connected reference voltage potentiometer W with converter 31 pin with node between thermopair
2Two ends in parallel with the linear compensation branch road, potentiometer W
2Middle-end be connected temperature-compensated voltage regulator potentiometer W with converter 36 pin
3With after temperature compensating element in the cold junction compensation device is in parallel and R
3Series connection forms cold junction compensation branch road and in parallel with the linear compensation branch road, potentiometer W
3Middle-end be connected with converter 30 pin.
2, linear compensation device according to claim 1 is characterized in that described cold junction compensation device is by hot tie-in temperature compensating element to be housed between two metal pole shoes, a termination thermopair of two pole shoes, other end wiring compensation branch road.
3, linear compensation device according to claim 1 and 2 is characterized in that described temperature compensating element is silicon diode, triode, thermistor or compensation integrated circuits.
4, linear compensation device according to claim 1 and 2 is characterized in that linear compensation resistance R
1With R
2Sum is 2～100K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94214506 CN2221207Y (en) | 1994-06-17 | 1994-06-17 | Linear compensating device of thermal couple digital thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94214506 CN2221207Y (en) | 1994-06-17 | 1994-06-17 | Linear compensating device of thermal couple digital thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2221207Y true CN2221207Y (en) | 1996-02-28 |
Family
ID=33830751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94214506 Expired - Fee Related CN2221207Y (en) | 1994-06-17 | 1994-06-17 | Linear compensating device of thermal couple digital thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2221207Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603863B (en) * | 2009-07-17 | 2010-09-29 | 大连理工计算机控制工程有限公司 | Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method |
| CN103900619A (en) * | 2012-12-26 | 2014-07-02 | 厦门雅迅网络股份有限公司 | Non-linear resistive sensor linearization method and circuit |
| CN104713655A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Circuit for measuring cold-end temperature of thermocouple |
-
1994
- 1994-06-17 CN CN 94214506 patent/CN2221207Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603863B (en) * | 2009-07-17 | 2010-09-29 | 大连理工计算机控制工程有限公司 | Realization of temperature compensation of cold junction of thermocouple based on temperature field fitting method |
| CN103900619A (en) * | 2012-12-26 | 2014-07-02 | 厦门雅迅网络股份有限公司 | Non-linear resistive sensor linearization method and circuit |
| CN104713655A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Circuit for measuring cold-end temperature of thermocouple |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW495606B (en) | Calibrated isothermal assembly for a thermocouple thermometer | |
| US6554469B1 (en) | Four current transistor temperature sensor and method | |
| US9121768B2 (en) | Thermal sensor device | |
| CN101498749B (en) | Accurate resistor measuring apparatus and method thereof | |
| CN102829888B (en) | Method for eliminating three-wire heating resistor measurement errors | |
| US8608377B2 (en) | Thermocouple extension wire | |
| CN2221207Y (en) | Linear compensating device of thermal couple digital thermometer | |
| CN2234085Y (en) | Cold end temp. compensation circuit for thermo-couple | |
| US3339414A (en) | Direct reading resistance thermometer | |
| CN205748699U (en) | A kind of linear transform circuit for negative tempperature coefficient thermistor | |
| CN1952632A (en) | High precision intelligent platinum thermal resistance temperature sensor with correction function | |
| CN2217791Y (en) | Cold-end compensation device for thermocouple | |
| CN1081251A (en) | Ordinary three-wire thermocouple thermometering system | |
| CN114485975A (en) | Three-wire system temperature measuring circuit for thermocouple rapid cold end compensation system | |
| NO167336B (en) | ELECTRONIC CIRCUIT DEVICE. | |
| CN2180987Y (en) | Thermocuple compensator | |
| CN112953501B (en) | Universal signal input circuit for intelligent instrument | |
| GB2082774A (en) | Thermocouple Cold Junction Compensation | |
| CN215865540U (en) | Thermocouple cold junction compensation circuit and thermocouple temperature measurement system | |
| CN107462344A (en) | A kind of linear transformation method and circuit for negative tempperature coefficient thermistor | |
| CN2108290U (en) | Integrated prob digit thermometer | |
| RU2125717C1 (en) | Thin-film resistance thermometer | |
| JP3367827B2 (en) | Micro flowmeter for vacuum | |
| CN86209326U (en) | Digital thermometer with a/d nonlinear correction | |
| JPH10160592A (en) | Thermocouple temperature measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |