CN204881901U - High accuracy temperature sensor based on four -wire system PT100 - Google Patents
High accuracy temperature sensor based on four -wire system PT100 Download PDFInfo
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- CN204881901U CN204881901U CN201520497730.7U CN201520497730U CN204881901U CN 204881901 U CN204881901 U CN 204881901U CN 201520497730 U CN201520497730 U CN 201520497730U CN 204881901 U CN204881901 U CN 204881901U
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Abstract
The utility model discloses a high accuracy temperature sensor based on four -wire system PT100, it belongs to measuring instrument technical field, has solved the problem that ordinary sensor accuracy is not high, data transmission is unstable. This scheme is passed through the constant current source load on PT100 to gathering the voltage on the PT100 through the ADS1114 chip, sending microprocessor thereafter to, microprocessor still can pass data back server through 485 buses. The utility model is suitable for a various temperature measurement environment are particularly useful for the application in the aspect of high accuracy and the industrial control.
Description
Technical field
The utility model relates to a kind of temperature sensors of high precision, a kind of temperature sensors of high precision based on four-wire system PT100.
Background technology
At present, thermal resistance method measuring tempeature mainly adopts two-wire system, three-wire system, the platinum resistance PT100 of four-wire system, and wherein by lead effect comparatively greatly, not, the error effect of constant-current source circuit to temperature measurement circuit is larger for two-wire system and three-wire system.In industrial control system, temperature data often needs transfer ratio larger distance, and extraneous factor is also larger on the impact of its data.
Summary of the invention
, data not high for the existing temperature measurement system precision mentioned in technical background are subject to the defect that ectocine is large, the utility model provides a kind of temperature sensors of high precision based on four-wire system PT100, it is made up of constant current source, PT100 platinum resistance, ADC chip ADS1114, microprocessor, also can comprise communication module.This programme by being carried on PT100 by constant current source, and gathers the voltage on PT100 by ADS1114 chip, and send microprocessor to thereafter, microprocessor also can pass data back server by 485 buses.Its theory diagram as shown in Figure 1.
In annexation, constant current source is connected with microprocessor with PT100 platinum resistance, and ADC chip ADS1114 is connected with microprocessor with PT100 platinum resistance, and during as comprised communication module, communication module is connected with microprocessor.Being described as follows of each several part:
Constant current source, it controls range and accuracy selection by processor, thus the constant current source produced, its preferred DA chip AD5422.DA chip AD5422 has Resolutions: 12/16 can be used for the temp measuring system of different accuracy to select.It also has the 0mA to 24mA of three output current scope: 4mA to 22mA, 0mA to 20mA or outrange, to meet the selection of various different range temp measuring system.High-acruracy survey ambient temperature can be realized,
PT100 platinum resistance, PT100 is 100 Europe High Precision Low Temperature drift resistance, and it has four lines and is connected with external circuit, therefore be called four-wire system, four lines are respectively, and one is connected with constant current source, one is connected with ADC chip ADS1114, also has the ground wire that two corresponding.
Microprocessor, carries out logical operation and control, and microprocessor comprises single-chip microcomputer, ARM, STM32.
ADC chip ADS1114, carries out the collection of voltage signal, and signal is passed to microprocessor.
Communication module, communication module is connected with microprocessor, sends signal to data receiver.It comprises wired mode and wireless mode, the preferred RS485 bus of wired mode and RS232 bus, and when adopting RS485 bus mode, communication module comprises transponder chip SP485R.Wireless mode preferred wireless radio-frequency module, Zigbee wireless module, bluetooth module, WIFI module, GSM GPRS module, one in Beidou communication module.
Accompanying drawing explanation
Fig. 1 is the utility model theory diagram.
Embodiment
Present embodiments provide a kind of industrial warm sensor, it is by constant current source, platinum resistance PT100, ADC conversion portion, microprocessor, 485 buses and industrial master controller composition.Wherein constant current source part is the steady current being produced 4-22mA by 16 DAC chip AD5422.Constant current source flows through platinum resistance, and the change of its ambient temperature is converted to voltage to be measured, and gathers this voltage signal by 16 ADC chip ADS1114, and passes to microprocessor and process.Microprocessor sends data to industrial master controller by 485 buses afterwards, and RS-485 bus communication adopts SP485R chip to be connected with microprocessor and realizes.Time necessary, industrial control unit (ICU) also can send microprocessor instruction to by RS-485 bus, carries out Long-distance Control.
Above-mentioned embodiment is only preferred implementation of the present utility model; can not limit the scope of the utility model protection with this, any immaterial change that those skilled in the art does on basis of the present utility model and replacement all belong to the utility model scope required for protection.
Claims (4)
1. the temperature sensors of high precision based on four-wire system PT100, it is characterized in that, comprise constant current source, PT100 platinum resistance, ADC chip ADS1114, microprocessor, constant current source is connected with microprocessor with PT100 platinum resistance, ADC chip ADS1114 is connected with microprocessor with PT100 platinum resistance, described constant current source controls range by processor and carries out accuracy selection, thus produces constant current source, and constant current source comprises DA chip AD5422.
2. the temperature sensors of high precision based on four-wire system PT100 according to claim 1, is characterized in that, described microprocessor comprises single-chip microcomputer, ARM, STM32.
3. the temperature sensors of high precision based on four-wire system PT100 according to claim 1, is characterized in that, also comprise communication module, and described communication module is connected with microprocessor, and communication module comprises wired mode and wireless mode.
4. the temperature sensors of high precision based on four-wire system PT100 according to claim 3, is characterized in that, described communication module comprises RS485 bus and RS232 bus, and when adopting RS485 bus mode, communication module comprises transponder chip SP485R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520497730.7U CN204881901U (en) | 2015-07-12 | 2015-07-12 | High accuracy temperature sensor based on four -wire system PT100 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520497730.7U CN204881901U (en) | 2015-07-12 | 2015-07-12 | High accuracy temperature sensor based on four -wire system PT100 |
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| Publication Number | Publication Date |
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| CN204881901U true CN204881901U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520497730.7U Expired - Fee Related CN204881901U (en) | 2015-07-12 | 2015-07-12 | High accuracy temperature sensor based on four -wire system PT100 |
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| CN (1) | CN204881901U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404207A (en) * | 2016-11-08 | 2017-02-15 | 辽宁师范大学 | Platinum resistance-based wide-range high-precision temperature measuring instrument and measuring method thereof |
| CN107145095A (en) * | 2016-03-01 | 2017-09-08 | 四川中泽电子有限公司 | A kind of liquid nitrogen container temperature monitoring system |
-
2015
- 2015-07-12 CN CN201520497730.7U patent/CN204881901U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107145095A (en) * | 2016-03-01 | 2017-09-08 | 四川中泽电子有限公司 | A kind of liquid nitrogen container temperature monitoring system |
| CN106404207A (en) * | 2016-11-08 | 2017-02-15 | 辽宁师范大学 | Platinum resistance-based wide-range high-precision temperature measuring instrument and measuring method thereof |
| CN106404207B (en) * | 2016-11-08 | 2020-04-03 | 辽宁师范大学 | Wide-range high-precision temperature measuring instrument based on platinum resistor and measuring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160712 |
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| CF01 | Termination of patent right due to non-payment of annual fee |