CN207472444U - A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment - Google Patents
A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment Download PDFInfo
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- CN207472444U CN207472444U CN201721698067.2U CN201721698067U CN207472444U CN 207472444 U CN207472444 U CN 207472444U CN 201721698067 U CN201721698067 U CN 201721698067U CN 207472444 U CN207472444 U CN 207472444U
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- thermometer sensor
- platinum resistance
- resistance thermometer
- temperature measuring
- electrically connected
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Abstract
The utility model discloses a kind of high-precision platinum resistance thermometer sensor, temperature measuring equipments, the device includes the platinum resistance thermometer sensor, being electrically connected with amplifying circuit, above-mentioned amplifying circuit is electrically connected with A/D converter, the main control module being electrically connected with telecommunication circuit is then electrically connected with above-mentioned A/D converter, above-mentioned platinum resistance thermometer sensor, is electrically connected with constant-current source circuit, reference voltage source is electrically connected with above-mentioned constant-current source circuit and A/D converter, and power module is electrically connected with above-mentioned reference voltage source, constant-current source circuit, amplifying circuit, A/D converter, main control module and telecommunication circuit and powers for it.High-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model, four-wire system platinum resistance thermometer sensor, is driven using constant-current source circuit, voltage acquisition is carried out using A/D converter, overcomes existing lead resistance and self-heating effect two large problems when carrying out high precision measuring temperature with platinum resistance thermometer sensor,.
Description
Technical field
The utility model is related to temperature measuring equipment field, more particularly to a kind of high-precision platinum thermoelectricity in the field
Hinder temperature measuring equipment.
Background technology
With the continuous development of production technology, temperature survey is widely used in industry, agricultural, navigation and daily life
In.It is currently used it is more be numeric type temperature sensor, such as DS18B20, SMT16030, AD590, although such sensor makes
With convenient simple, but its precision is relatively low, it is impossible to meet the requirement of the high precision measuring temperatures occasions such as meteorology, oceanographic observation.
Utility model content
Technical problem to be solved in the utility model, be just to provide it is a kind of it is at low cost, precision is high, highly reliable high-precision
Spend platinum resistance thermometer sensor, temperature measuring equipment.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution：
A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment, thes improvement is that：The device includes and amplifying circuit electricity
The platinum resistance thermometer sensor, of connection, above-mentioned amplifying circuit are electrically connected with A/D converter, the main control module being electrically connected with telecommunication circuit then with
Above-mentioned A/D converter electrical connection, above-mentioned platinum resistance thermometer sensor, are electrically connected with constant-current source circuit, reference voltage source and above-mentioned constant current
Source circuit and A/D converter electrical connection, power module turn with above-mentioned reference voltage source, constant-current source circuit, amplifying circuit, A/D
Parallel operation, main control module and telecommunication circuit are electrically connected and power for it.
Further, the platinum resistance thermometer sensor, is PT1000.
Further, the mode of connection of the platinum resistance thermometer sensor, is four-wire system, i.e., is respectively drawn at the root both ends of platinum resistance thermometer sensor,
Two leads, wherein two leads are used for providing constant current, another two leads are used for carrying out voltage detecting.
Further, the telecommunication circuit is RS232 full duplex serial communication circuits.
Further, the main control module is microcontroller.
Further, the constant-current source circuit includes an adder, a voltage follower and six resistance, wherein
The voltage value of platinum resistance thermometer sensor, is fed back to adder by voltage follower；In the input terminal of adder, R1, R2, R3, R4 tetra- is set
Resistance sets resistance R5 between the output terminal and platinum resistance thermometer sensor, of adder, and resistance R6 is set between platinum resistance thermometer sensor, and ground.
Further, the resistance R5 selects 0.1% low temp rising high precision metalfilmresistor.
Further, the output current of the constant-current source circuit is 0.5mA.
Further, the power module is linear stabilized power supply.
Further, between main control module and A/D converter using magnetic bead carry out digital-to-analogue isolation, using 0 Ω resistance into
Row single-point grounding.
The beneficial effects of the utility model are：
High-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model, using constant-current source circuit driving four-wire system platinum heat
Resistance carries out voltage acquisition using A/D converter, overcomes existing lead resistance when carrying out high precision measuring temperature with platinum resistance thermometer sensor,
With self-heating effect two large problems.
High-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model is simultaneously constant current by using reference voltage source
Source circuit and A/D converter provide reference voltage, reduce circuit chip caused constant error in itself.
High-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model, constant-current source circuit carry voltage follower,
Voltage adjusting can be carried out in real time, it is ensured that electric current output is steady state value.Resistance R6 is added as the anti-interference resistance of voltage acquisition, is reduced
The fluctuating error brought by power ground.
High-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model, power module are linear stabilized power supplies, reaction
Speed is fast, and output voltage ripple is small, and noise is low, is suitably for temperature measuring equipment power supply.Digital-to-analogue isolation is carried out using magnetic bead, uses 0
Ω resistance carries out single-point grounding, enhances system rejection to disturbance performance.
In conclusion high-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model, selects cost-effective material
It is at low cost as device device, it is highly practical, high precision measuring temperature occasion is can be widely applied to, precision is up to 0.05 DEG C.
Description of the drawings
Fig. 1 is the composition frame chart of high-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model embodiment 1；
Fig. 2 is the circuit of constant-current source circuit in high-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model embodiment 1
Connection diagram；
Fig. 3 is the work flow diagram of high-precision platinum resistance thermometer sensor, temperature measuring equipment disclosed in the utility model embodiment 1.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Embodiment 1, as shown in Figure 1, present embodiment discloses a kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment, the device
Including the platinum resistance thermometer sensor, 3 being electrically connected with amplifying circuit 4, above-mentioned amplifying circuit 4 is electrically connected with A/D converter 5, with telecommunication circuit
The main control module 6 of 7 electrical connections is then electrically connected with above-mentioned A/D converter 5, and above-mentioned platinum resistance thermometer sensor, 3 is electrically connected with constant-current source circuit 2
It connects, reference voltage source 1 is electrically connected with above-mentioned constant-current source circuit 2 and A/D converter 5, power module 8 and above-mentioned reference voltage
Source 1, constant-current source circuit 2, amplifying circuit 4, A/D converter 5, main control module 6 and telecommunication circuit 7 are electrically connected and power for it.Base
Reference voltage source provides reference voltage for constant-current source circuit and A/D converter simultaneously, and constant-current source circuit is stablized defeated to platinum resistance thermometer sensor,
Go out 0.5mA electric currents, microcontroller, microcontroller meter are inputted after the platinum resistance thermometer sensor, voltage value that A/D converter acquisition is amplified through amplifying circuit
Calculation obtains the current resistance value of platinum resistance thermometer sensor, since the resistance value of platinum resistance thermometer sensor, can change with the variation of environment temperature, according to
With regard to that can deduce the temperature under current environment, which can outward be exported the resistance value by telecommunication circuit.
In the present embodiment, the platinum resistance thermometer sensor, be PT1000, at 0 DEG C resistance value be 1000 Ω, the resistance value at 100 DEG C
About 1385 Ω.The mode of connection of the platinum resistance thermometer sensor, is four-wire system, i.e., respectively draws two at the root both ends of platinum resistance thermometer sensor, and draw
Line, wherein two leads are used for providing constant current, another two leads are used for carrying out voltage detecting.
The telecommunication circuit is RS232 full duplex serial communication circuits.
The main control module is microcontroller, and preferably macrocrystalline science and technology chip STC15W408AS, the chip is cost-effective, behaviour
Make simply, it is easy to use.
As shown in Fig. 2, the constant-current source circuit includes an adder U1, a voltage follower U2 and six electricity
The voltage value of platinum resistance thermometer sensor, is fed back to adder U1 by resistance, wherein voltage follower U2, and the output voltage of adder is input electricity
Press and follow the sum of voltage；Tetra- resistance of R1, R2, R3, R4 are set in the input terminal of adder, in the output terminal and platinum of adder
Resistance R5 between thermal resistance is set, resistance R6 is set between platinum resistance thermometer sensor, and ground.
The resistance R5 is the current control resistor of constant-current source circuit, selects 0.1% low temp rising high precision metal film electricity
Resistance.
The power module is linear stabilized power supply.Magnetic bead is used between main control module and A/D converter into line number
Mould is isolated, and single-point grounding is carried out using 0 Ω resistance.
As shown in figure 3, the workflow of high-precision platinum resistance thermometer sensor, temperature measuring equipment is disclosed in the present embodiment：When user needs
When measuring current environmental temperature value, platinum resistance thermometer sensor, both ends output voltage is measured first, and platinum resistance thermometer sensor, is obtained current by calculating
Resistance value under environment；Then software digital filter is carried out to measured value using microcontroller, obtains reliable measurements data；Finally exist
Nonlinear compensation is carried out to platinum resistance thermometer sensor, using least square method in microcontroller, algorithm fitting acquisition is carried out in temperature-measuring range and is worked as
Preceding ambient temperature value.
Claims (10)
1. a kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment, it is characterised in that：The device includes what is be electrically connected with amplifying circuit
Platinum resistance thermometer sensor, above-mentioned amplifying circuit are electrically connected with A/D converter, the main control module being electrically connected with telecommunication circuit then with it is above-mentioned
A/D converter is electrically connected, and above-mentioned platinum resistance thermometer sensor, is electrically connected with constant-current source circuit, reference voltage source and above-mentioned constant-current source circuit
It is electrically connected with A/D converter, power module and above-mentioned reference voltage source, constant-current source circuit, amplifying circuit, A/D converter, master
Control module and telecommunication circuit are electrically connected and power for it.
2. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The platinum resistance thermometer sensor, is
PT1000。
3. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The wiring of the platinum resistance thermometer sensor,
Mode is four-wire system, i.e., respectively draws two leads at the root both ends of platinum resistance thermometer sensor, wherein two leads are used for providing constant electricity
Stream, another two leads are used for carrying out voltage detecting.
4. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The telecommunication circuit is
RS232 full duplex serial communication circuits.
5. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The main control module is single
Piece machine.
6. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The constant-current source circuit packet
An adder, a voltage follower and six resistance are included, wherein voltage follower feeds back to the voltage value of platinum resistance thermometer sensor,
Adder；Tetra- resistance of R1, R2, R3, R4 are set in the input terminal of adder, between the output terminal and platinum resistance thermometer sensor, of adder
Resistance R5 is set, resistance R6 is set between platinum resistance thermometer sensor, and ground.
7. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 6, it is characterised in that：The resistance R5 is selected
0.1% low temp rising high precision metalfilmresistor.
8. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The constant-current source circuit it is defeated
Go out electric current for 0.5mA.
9. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：The power module is line
Property regulated power supply.
10. high-precision platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that：Turn in main control module and A/D
Digital-to-analogue isolation is carried out using magnetic bead between parallel operation, single-point grounding is carried out using 0 Ω resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721698067.2U CN207472444U (en) | 2017-12-07 | 2017-12-07 | A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721698067.2U CN207472444U (en) | 2017-12-07 | 2017-12-07 | A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment |
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| Publication Number | Publication Date |
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| CN207472444U true CN207472444U (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721698067.2U Active CN207472444U (en) | 2017-12-07 | 2017-12-07 | A kind of high-precision platinum resistance thermometer sensor, temperature measuring equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268633A (en) * | 2020-10-22 | 2021-01-26 | 合肥中科离子医学技术装备有限公司 | Temperature and resistance value conversion method for industrial platinum resistor with voltage of 30-73K |
-
2017
- 2017-12-07 CN CN201721698067.2U patent/CN207472444U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268633A (en) * | 2020-10-22 | 2021-01-26 | 合肥中科离子医学技术装备有限公司 | Temperature and resistance value conversion method for industrial platinum resistor with voltage of 30-73K |
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