CN201417184Y - two-wire temperature transmitter - Google Patents
two-wire temperature transmitter Download PDFInfo
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- CN201417184Y CN201417184Y CN2009200554952U CN200920055495U CN201417184Y CN 201417184 Y CN201417184 Y CN 201417184Y CN 2009200554952 U CN2009200554952 U CN 2009200554952U CN 200920055495 U CN200920055495 U CN 200920055495U CN 201417184 Y CN201417184 Y CN 201417184Y
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Abstract
The utility model discloses a two-wire temperature transmitter, which comprises an acquisition part, an amplification part, a linearity adjustment part, and a V / I conversion part; the two-wire temperature transmitter aims at realizing the conversion from resistance signal to standard current signal; the acquisition part is as follows: connectors RI and RO are connected with a sensor, and changethe resistance value along with the temperature variation, therefore, the resistance signal is converted into current for entering into chip IC1; the amplification part is completed by the internal circuit of the chip IC1; the linearity adjustment part is as follows: an adjustable resistance R1 is used for linearity adjusting of temperature-output current; the V / I conversion part is as follows:a triode Q1 converts the voltage signal into constant-current source to output. The functions of the two-wire temperature transmitter are as follows: the resistance signal of a temperature sensor is acquired, amplified, adjusted about linearity, V / I converted, and then 4-20mA industrial standard current signal is outputted; the two-wire temperature transmitter can be matched with a recording meter, a digital display meter, a regulator, and a PLC system to form various temperature measurement and control systems. The two-wire temperature transmitter is convenient to operate, and has good adaptability; the cost is only about 1 / 3 of market price.
Description
Technical field
The utility model relates to a kind of two-wire system temperature transmitter, belongs to the technology of instrument and meter field.
Background technology
Traditional temperature transmitter utilizes the mimic channel electric bridge to gather and amplification, is subjected to the influence of resistance temperature drift, and precision is unstable under different temperature environments, and mounting means inconvenience need be beaten screw retention in electronic-control box, and perhaps exposed circuit board makes moist easily.Aspect precision control, conventional temperature transmitter precision instability, comparatively common about 0.5%-0.2%, and the temperature transmitter fetch long price of 0.1% precision.Aspect the adaptability of sensor, Traditional Transmitters can only be chosen some specific sensor and measure.Therefore, be necessary further improvement and perfect.
The utility model content
The purpose of this utility model aims to provide that a kind of simple and reasonable, precision high-performance is stable, sensor wide adaptability, measuring range adjustable, lower-cost two-wire system temperature transmitter, to overcome weak point of the prior art.
A kind of two-wire system temperature transmitter by this purpose design comprises that collection, amplification, linearity adjustment, V/I change several sections, to realize the conversion of resistance signal to the normalized current signal, it is characterized in that:
Collecting part: joint RI is connected sensor with RO, varies with temperature the change resistance, enters chip IC 1 thereby resistance signal is converted to electric current; Amplifier section is finished by chip IC 1 internal circuit; The linearity is adjusted: adjustable resistance R1 uses as the linearity adjustment of temperature-output current; The V/I conversion: triode Q1 is converted to constant current source output with voltage signal.
Described adjustable resistance R1 is connected between the 3rd pin and the 4th pin of chip IC 1; Rheostat R2 is connected between the 12nd pin and joint RI of chip IC 1; Rheostat R3 and resistance R 4 are used as zeroing and accent are full, are connected between the 1st pin and the 6th pin of chip IC 1.Be parallel with filter capacitor C2 at the two ends of resistance R 4, jointing RO between rheostat R3 and the resistance R 4.
Described triode Q1 connects the 8th, the 9th, the 10th pin of chip IC1 respectively, is connected with filter capacitor C1 between the 7th pin of the collector of triode Q1 and chip IC 1, and collector connects direct supply access point VCC behind protection diode D1.
The XTR105P of described chip IC 1 preferred BB company becomes and send chip.
Function of the present utility model be with the resistance signal of temperature sensor gather, amplification, linearity adjustment, V/I conversion, export the industry standard current signal of 4-20mA then, can use with recorder, digital displaying meter, regulator, PLC system support, form all temps and measure and control system.It can be measured sensors such as PT100, PT1000, NTC, only needs to adjust the rheostat resistance, and is easy to operate, wide adaptability, and cost is lower, only is about 1/3 of the market price.Use chip XTR105 to carry out linear compensation in the circuit, thereby the non-linear of RTD improved greatly the quadratic term in the platinum resistance.
Description of drawings
Fig. 1 is the utility model one embodiment circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Referring to Fig. 1, this two-wire system temperature transmitter is made up of collection, amplification, V/I conversion, linearity adjustment several sections, and wherein, collecting part: joint RI is connected sensor as collecting part with RO, vary with temperature the change resistance, enter chip thereby resistance signal is converted to electric current.Amplifier section is finished by the IC1 internal circuit.The V/I conversion: triode Q1 is that the V/I conversion is used, and voltage signal is converted to constant current source output.C1, C2 are filter capacitor, prevent to disturb.The linearity is adjusted: in order to adapt to the linearity of various sensors, need carry out linearity adjustment, R1 is an adjustable resistance, uses as the linearity adjustment of temperature-output current.In order to adjust measurement range, rheostat R3 and resistance R 4 are used as zeroing and accent are full.Anti-wiring error protection:, adopt D1 to prevent that current reversal passes through for preventing to connect the protection diode D1 of anti-use.VCC is a 24V direct supply access point, and OUT is electric current output.
When internal circuit board is packed shell into, need carry out the filler plastic packaging.Play the technical protection effect on the one hand, play moisture-proof role on the other hand, prolong the components and parts life-span, reduce drift.Shell adopts the card rail to install, and is easily installed in the control panel and blocks on the rail.
Characteristics of the present utility model:
A, realize by adjusting rheostat R3 and R2. Zero point, range is adjustable, and range adjustment and zero Point is adjusted and to be independent of each other, and measurement category-200 ℃～850 ℃ is wider than market like product.
B, with the external power source electric current and consume and strictly separate, thereby reduction internal power consumption and heating, minimizing Thermal drift is to improve circuit performance.
C, adopted the XTR105P of BB company to become to send chip, to carry out periphery circuit design, to have very High cost performance. Precision is one thousandth, is higher than the market like product. Can with recording apparatus, digital display Instrument, adjuster, PLC system support is used, and forms various Temperature Measure Control System. Adopt the two wires Load mode processed (output of power supply and signal shares couple of conductor), output and dut temperature linear 4～The 20mADC current signal can be measured-200 ℃～850 ℃ various Jie that scope is interior in the industrial processes The temperature of matter.
D, to the wide accommodation of sensor. Go for PT100, PT1000, NTC sensor.
Claims (5)
1, a kind of two-wire system temperature transmitter comprises that collection, amplification, linearity adjustment, V/I change several sections, to realize the conversion of resistance signal to the normalized current signal, it is characterized in that:
Collecting part: joint RI is connected sensor with RO, varies with temperature the change resistance, enters chip IC 1 thereby resistance signal is converted to electric current;
Amplifier section is finished by chip IC 1 internal circuit;
The linearity is adjusted: adjustable resistance R1 uses as the linearity adjustment of temperature-output current;
The V/I conversion: triode Q1 is converted to constant current source output with voltage signal.
2, two-wire system temperature transmitter according to claim 1 is characterized in that described adjustable resistance R1 is connected between the 3rd pin and the 4th pin of chip IC 1; Rheostat R2 is connected between the 12nd pin and joint RI of chip IC 1; Rheostat R3 and resistance R 4 are used as zeroing and accent are full, are connected between the 1st pin and the 6th pin of chip IC 1.
3, two-wire system temperature transmitter according to claim 2 is characterized in that being parallel with filter capacitor C2 at the two ends of resistance R 4, jointing RO between rheostat R3 and the resistance R 4.
4, two-wire system temperature transmitter according to claim 1; it is characterized in that described triode Q1 connects the 8th, the 9th, the 10th pin of chip IC1 respectively; be connected with filter capacitor C1 between the 7th pin of the collector of triode Q1 and chip IC 1, and collector connects direct supply access point VCC behind protection diode D1.
5,, it is characterized in that described chip IC 1 send chip for the XTR105P of BB company becomes according to claim 1,2 or 4 described two-wire system temperature transmitters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200554952U CN201417184Y (en) | 2009-04-23 | 2009-04-23 | two-wire temperature transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200554952U CN201417184Y (en) | 2009-04-23 | 2009-04-23 | two-wire temperature transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201417184Y true CN201417184Y (en) | 2010-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200554952U Expired - Fee Related CN201417184Y (en) | 2009-04-23 | 2009-04-23 | two-wire temperature transmitter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289464A (en) * | 2016-09-30 | 2017-01-04 | 南京林业大学 | A kind of two-wire system faint strain bridge signal transmitting device |
| CN106404190A (en) * | 2016-08-31 | 2017-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Novel line temperature transmission device |
| CN107063495A (en) * | 2016-11-28 | 2017-08-18 | 科诺伟业风能设备（北京）有限公司 | Two-wire system PT100 resistance and the compatible temperature measurement circuit of NTC resistance |
| CN111982333A (en) * | 2020-08-26 | 2020-11-24 | 九阳股份有限公司 | High-precision temperature sampling circuit and method |
| CN115452182A (en) * | 2022-08-20 | 2022-12-09 | 西安翔腾微电子科技有限公司 | Bridge type sensor signal conditioning circuit and method |
| CN116054847A (en) * | 2022-12-23 | 2023-05-02 | 珠海格力电器股份有限公司 | Two-wire system protocol transmitting circuit and two-wire system transmitter |
-
2009
- 2009-04-23 CN CN2009200554952U patent/CN201417184Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404190A (en) * | 2016-08-31 | 2017-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Novel line temperature transmission device |
| CN106289464A (en) * | 2016-09-30 | 2017-01-04 | 南京林业大学 | A kind of two-wire system faint strain bridge signal transmitting device |
| CN107063495A (en) * | 2016-11-28 | 2017-08-18 | 科诺伟业风能设备（北京）有限公司 | Two-wire system PT100 resistance and the compatible temperature measurement circuit of NTC resistance |
| CN111982333A (en) * | 2020-08-26 | 2020-11-24 | 九阳股份有限公司 | High-precision temperature sampling circuit and method |
| CN115452182A (en) * | 2022-08-20 | 2022-12-09 | 西安翔腾微电子科技有限公司 | Bridge type sensor signal conditioning circuit and method |
| CN116054847A (en) * | 2022-12-23 | 2023-05-02 | 珠海格力电器股份有限公司 | Two-wire system protocol transmitting circuit and two-wire system transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: MEIDI GENERAL REFRIGERATION APPARATUS CO., LTD., C Free format text: FORMER OWNER: MEIDI ELECTRIC APPLIANCES CO., LTD., GUANGDONG Effective date: 20101222 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 528300 PENGLAI ROAD, BEIJIAO TOWN, SHUNDE DISTRICT, FOSHAN CITY, GUANGDONG PROVINCE TO: 400000 TUOZHAN ZONE, YUMACHI INDUSTRIAL PARK, CHAYUAN NEW ZONE, NAN AN DISTRICT, CHONGQING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101222 Address after: 400000 Development Zone of jade horse pond Industrial Park, new tea garden, Nan'an District, Chongqing Patentee after: Chongqing Midea General Refrigerating Equipment Co., Ltd. Address before: 528300 Penglai Road, Beijiao Town, Shunde District, Guangdong, Foshan Patentee before: Meidi Electric Appliances Co., Ltd., Guangdong |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100303 Termination date: 20150423 |
|
| EXPY | Termination of patent right or utility model |