CN204330167U - A kind of temperature measuring equipment based on platinum resistance thermometer sensor, - Google Patents
A kind of temperature measuring equipment based on platinum resistance thermometer sensor, Download PDFInfo
- Publication number
- CN204330167U CN204330167U CN201420872965.5U CN201420872965U CN204330167U CN 204330167 U CN204330167 U CN 204330167U CN 201420872965 U CN201420872965 U CN 201420872965U CN 204330167 U CN204330167 U CN 204330167U
- Authority
- CN
- China
- Prior art keywords
- circuit
- thermometer sensor
- platinum resistance
- resistance thermometer
- analog
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
A kind of temperature measuring equipment based on platinum resistance thermometer sensor, is made up of mainboard (1), platinum resistance thermometer sensor, (2), stube cable (3).Platinum resistance thermometer sensor, (2) directly contacts with testee, resistance and the temperature of platinum resistance thermometer sensor, are linearly proportional, and this corresponding relation is invariable, platinum resistance thermometer sensor, (2) is connected with mainboard (1), resistance value is converted to analog voltage signal by circuit, analog to digital conversion circuit on mainboard converts this analog voltage signal to digital signal, after master controller on mainboard (1) receives this digital signal, be converted into corresponding resistance value, mode again by tabling look-up just can calculate the temperature value corresponding to current resistance, thus realize thermometric function.This device adopts model to be the platinum resistance thermometer sensor, of PT1000, Measurement Resolution can reach 0.01 degree Celsius, Measurement Resolution is very high, the platinum resistance thermometer sensor, of this device is connected with measurement mechanism independent of outside measurement mechanism and by a cable in addition, can be integrated in other any device, be there is the advantage being easy to secondary development and being convenient to promote.
Description
Technical field
The utility model relates to a kind of measurement mechanism, and especially a kind of temperature measuring equipment based on platinum resistance thermometer sensor, belongs to thermometric technical field.
Background technology
At present, for thermometric device, its structure is primarily of part compositions such as temperature sensor, host module, display circuits.Its temperature sensor mainly adopts thermal sensing element and digital device, and adopt the temperature measuring equipment of thermal sensing element, although sensor low price, resolution is lower, generally can only reach 0.1 degrees centigrade.Adopt the temperature measuring equipment of digital device, although circuit is simple, and resolution comparatively thermal sensing element increase, generally can reach 0.06 degrees centigrade, but in the occasion such as Industry Control, scientific experiment, Aero-Space that some resolution requirement is higher, the temperature measuring equipment of this digital device just can not meet the demands.Therefore, find a kind of high-precision thermal sensing element, coordinate corresponding circuit and control program can realize the temperature survey that resolution is 0.01 degree Celsius, existing temperature measuring equipment is improved to being necessary.
Utility model content
For the above-mentioned deficiency of existing thermometry, the technical matters that the utility model solves is a kind of temperature measuring equipment based on platinum resistance thermometer sensor, of design.
Solving this technical problem adopted technical scheme is: a kind of temperature measuring equipment based on platinum resistance thermometer sensor, is made up of mainboard, platinum resistance thermometer sensor, stube cable three part.Platinum resistance thermometer sensor, directly contacts with testee, resistance and the temperature of platinum resistance thermometer sensor, are linearly proportional, and this corresponding relation is invariable, platinum resistance thermometer sensor, is connected with mainboard, resistance value is converted to analog voltage signal by circuit, analog to digital conversion circuit on mainboard converts this analog voltage signal to digital signal, after master controller on mainboard receives this digital signal, be converted into corresponding resistance value, mode again by tabling look-up just can calculate the temperature value corresponding to current resistance, thus realizes thermometric function.
Described platinum resistance thermometer sensor, model is PT1000, the resistance of this thermal resistance linearly increases with the increase of temperature, resistance when temperature is 0 degree Celsius is 1000 ohm, resistance when temperature is 100 degrees Celsius is 1385.055 ohm, i.e. temperature variation 1 degree Celsius, increased resistance value is 3.85055 ohm, after 10 times being amplified to it by the amplifier on mainboard, temperature variation 0.01 degree Celsius, its increased resistance value is 0.385 ohm, select high-resolution modulus switching device just can realize the measurement of this resistance, therefore, the temperature survey that resolution is 0.01 degree Celsius can be realized.
Described mainboard is by signal conditioning circuit, analog to digital conversion circuit, main controller circuit, LED digital pipe display circuit, 5V power circuit, reference voltage circuit, positive and negative 12V power circuit.Analog to digital conversion circuit, LED digital pipe display circuit are all connected with main controller circuit.Signal conditioning circuit is connected with platinum resistance thermometer sensor, by stube cable, and exports analog voltage signal to analog to digital conversion circuit.5V power circuit is main controller circuit, LED digital pipe display circuit provides stable 5V DC voltage, and reference voltage circuit provides adjustable reference voltage and stable 2.5V DC voltage for analog to digital conversion circuit.Positive and negative 12V power circuit provides the DC voltage of stable positive and negative 12V for signal conditioning circuit.
The beneficial effects of the utility model are: thermometric resolution is very high, can reach 0.01 degree Celsius.In addition, platinum resistance thermometer sensor, is connected with measurement mechanism independent of outside measurement mechanism and by a cable, can be integrated in other any device, has the advantage being easy to secondary development and being convenient to popularization.
Accompanying drawing explanation
Fig. 1 is the utility model temperature measuring equipment structural drawing
Fig. 2 is the utility model mainboard theory diagram
Fig. 3 is the utility model signal conditioning circuit schematic diagram
Fig. 4 is the utility model analog to digital conversion circuit schematic diagram
Fig. 5 is the utility model main controller circuit schematic diagram
Fig. 6 is the utility model LED digital pipe display circuit schematic diagram
Fig. 7 is the utility model 5V power circuit principle figure
Fig. 8 is the utility model reference voltage circuit schematic diagram
Fig. 9 is the utility model positive and negative 12V power circuit principle figure
Wherein: 1-mainboard, 2-platinum resistance thermometer sensor, 3-stube cable, 11-signal conditioning circuit, 12-analog to digital conversion circuit, 13-main controller circuit, 14-LED digital pipe display circuit, 15-5V power circuit, 16-reference voltage circuit, the positive and negative 12V power circuit of 17-.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1, a kind of temperature measuring equipment based on platinum resistance thermometer sensor, of the utility model, is made up of mainboard 1, platinum resistance thermometer sensor, 2, stube cable 3.
As shown in Figure 2, a kind of temperature measuring equipment based on platinum resistance thermometer sensor, of the utility model, mainboard 1 is by signal conditioning circuit 11, analog to digital conversion circuit 12, main controller circuit 13, LED digital pipe display circuit 14,5V power circuit 15, reference voltage circuit 16 and positive and negative 12V power circuit 17 form.
Signal conditioning circuit shown in Fig. 3 is made up of platinum resistance thermometer sensor, interface P3, integrated transporting discharging LF353P, input balance resistance R16 and R17, feedback resistance R15, pull-up resistor R14, dividing potential drop sample resistance R18 and R19, sampling regulator potentiometer Rw4, input balance resistance R10 and R11, feedback resistance R12, feedback regulation potentiometer Rw3, pull-up resistor R13.Magnitude of voltage 1V when the function of this circuit is the voltage signal and 0 degree Celsius that are exported by platinum resistance thermometer sensor, 2 carries out subtraction, and the voltage signal after subtraction is amplified 10 times by integrated operational amplifier, exports analog to digital conversion circuit 12 to.
Analog to digital conversion circuit in Fig. 4 is made up of analog to digital converter AD7981, RC wave filter R20 and C26, decoupling capacitance C16 and C17.The function of this circuit converts the analog voltage signal that signal conditioning circuit 11 exports to digital signal to export main controller circuit 13 to, by software algorithm, magnitude of voltage is converted into resistance value.
Main controller circuit in Fig. 5 is made up of AVR single chip Atmega8,8 megahertz quartz oscillators, corrective capacity C7, corrective capacity C8, ISP download interface, pull-up resistor R24, current-limiting resistance R36, current-limiting resistance R37, current-limiting resistance R38, current-limiting resistance R39, current-limiting resistance R40, current-limiting resistance R41, decoupling capacitance C9 and C10.The function of this circuit converts number conversion circuit 12 output digit signals to resistance value by software algorithm, carry out tabling look-up according to resistance value again and obtain corresponding temperature value, single-chip microcomputer demonstrates corresponding temperature value by input/output port control LED digital pipe display circuit 14.Crystal-oscillator circuit produces stabilizing clock oscillator signal, and ISP download interface realizes online download program function.
LED digital pipe display circuit in Fig. 6 is made up of the common anode type LED charactron of 3 two one, 6 driving triodes, 8550,6 current-limiting resistances.The function of this circuit completes Temperature displaying under the control of single-chip microcomputer in main controller circuit 13.
5V power electric routing interface P1 in Fig. 7,4 commutation diodes, filter capacitor C1, filter capacitor C2, decoupling capacitance C3, decoupling capacitance C27, three terminal regulator LM7805 are formed.The function of this circuit the alternating voltage of P1 is converted to stable 5V DC voltage is main controller circuit 13, LED digital pipe display circuit 14 provides electric energy.
Reference voltage circuit in Fig. 8 is made up of three terminal regulator LM1117-2.5, decoupling capacitance C4 and C6, filter capacitor C5, controllable accurate source of stable pressure CJ431A, adjusting resistance R1, sample resistance R2 and R3, filter capacitor C11, divider resistance R4 and R5, reference voltage regulator potentiometer Rw1.The function of this circuit the DC voltage of positive 12V is converted to stablize adjustable 5V reference voltage and be supplied to analog to digital converter in analog to digital conversion circuit 12, converts stable 2.5V DC voltage to for analog to digital conversion circuit 12 simultaneously and provide electric energy.
Positive and negative 12V power electric routing interface P2 in Fig. 9,4 commutation diodes, filter capacitor C20, filter capacitor C24, filter capacitor C22 and C18, decoupling capacitance C21, decoupling capacitance C25, decoupling capacitance C23 and C19, three terminal regulator MC7812CT and MC7912CT, controllable accurate source of stable pressure CJ431A, adjusting resistance R6, sample resistance R7, sample resistance R8 and R9, steady current regulator potentiometer Rw2 are formed.The function of this circuit the alternating voltage of P2 is converted to stable positive and negative 12V DC voltage to provide electric energy for the integrated operational amplifier in signal conditioning circuit 11, converts constant DC current simultaneously to and provide electric energy to platinum resistance thermometer sensor, 2.
Although describe embodiment of the present utility model by reference to the accompanying drawings, those of ordinary skill in the art can make various distortion or amendment within the scope of the appended claims.
Claims (1)
1. the temperature measuring equipment based on platinum resistance thermometer sensor, it is characterized in that, comprise mainboard (1), platinum resistance thermometer sensor, (2), stube cable (3), described mainboard (1) comprises signal conditioning circuit (11), analog to digital conversion circuit (12), main controller circuit (13), LED digital pipe display circuit (14), 5V power circuit (15), reference voltage circuit (16), positive and negative 12V power circuit (17), described positive and negative 12V power circuit (17) provides the DC voltage of stable positive and negative 12V for signal conditioning circuit (11), described signal conditioning circuit (11) to be connected with platinum resistance thermometer sensor, (2) by stube cable (3) and to export analog voltage signal to analog to digital conversion circuit (12), analog-digital conversion circuit as described (12), LED digital pipe display circuit (14) is all connected with main controller circuit (13), described 5V power circuit (15) is main controller circuit (13), LED digital pipe display circuit (14) provides stable 5V DC voltage, described reference voltage circuit (16) provides adjustable reference voltage and stable 2.5V DC voltage for analog to digital conversion circuit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872965.5U CN204330167U (en) | 2014-12-26 | 2014-12-26 | A kind of temperature measuring equipment based on platinum resistance thermometer sensor, |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872965.5U CN204330167U (en) | 2014-12-26 | 2014-12-26 | A kind of temperature measuring equipment based on platinum resistance thermometer sensor, |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204330167U true CN204330167U (en) | 2015-05-13 |
Family
ID=53166517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420872965.5U Expired - Fee Related CN204330167U (en) | 2014-12-26 | 2014-12-26 | A kind of temperature measuring equipment based on platinum resistance thermometer sensor, |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204330167U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112932419A (en) * | 2021-01-28 | 2021-06-11 | 徐州市双惠医疗设备有限公司 | Electronic thermometer calibration method |
| CN114046906A (en) * | 2021-11-17 | 2022-02-15 | 江西联智集成电路有限公司 | Method and system for calibrating temperature detection function of electronic cigarette mainboard and electronic equipment |
-
2014
- 2014-12-26 CN CN201420872965.5U patent/CN204330167U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112932419A (en) * | 2021-01-28 | 2021-06-11 | 徐州市双惠医疗设备有限公司 | Electronic thermometer calibration method |
| CN114046906A (en) * | 2021-11-17 | 2022-02-15 | 江西联智集成电路有限公司 | Method and system for calibrating temperature detection function of electronic cigarette mainboard and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203241165U (en) | Thermal resistor temperature measurement circuit based on three-wire system | |
| CN203705992U (en) | Temperature control device | |
| CN203177993U (en) | Temperature measuring circuit | |
| CN204330167U (en) | A kind of temperature measuring equipment based on platinum resistance thermometer sensor, | |
| CN105277292A (en) | Temperature measurement device | |
| CN203811291U (en) | High precision temperature measuring apparatus consuming low energy | |
| CN201672987U (en) | Temperature measuring apparatus | |
| CN101788830B (en) | Digital temperature control circuit | |
| CN210719453U (en) | Thermal resistance temperature measuring device based on RS485 bus | |
| CN204043810U (en) | A kind of thermocouple signal cold junction compensation device | |
| CN103759850B (en) | A kind of Micro Energy Lose digital thermometer and thermometry | |
| CN201096553Y (en) | Ultrasonic heat meter | |
| CN203657964U (en) | Pressure transmitter | |
| CN202255672U (en) | Temperature measuring system | |
| CN203964948U (en) | A kind of new soil flow of water temperature sensor | |
| CN205670053U (en) | A kind of temperature sensing device based on temperature frequency switch technology | |
| CN205228686U (en) | Ressure measurement appearance | |
| CN208689071U (en) | A kind of NTC airspeedometer | |
| CN207472444U (en) | A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment | |
| CN207163947U (en) | Flow thermal conductivity coefficient measuring instrument | |
| CN105424212A (en) | High-precision temperature measurement system based on resistance value comparison method | |
| CN204988362U (en) | Warm and humid acidimeter of novel tobacco field electronics based on bluetooth | |
| CN206378217U (en) | A kind of platinum sensor circuit of numeral output | |
| CN204214489U (en) | A kind of bucking-out system of ultrasonic flow meter peakvalue's checking | |
| CN104677517A (en) | High-precision temperature measuring system based on resistance comparison method |
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: 20150513 Termination date: 20151226 |
|
| EXPY | Termination of patent right or utility model |