CN107478349A - Temperature polling instrument - Google Patents
Temperature polling instrument Download PDFInfo
- Publication number
- CN107478349A CN107478349A CN201710684200.7A CN201710684200A CN107478349A CN 107478349 A CN107478349 A CN 107478349A CN 201710684200 A CN201710684200 A CN 201710684200A CN 107478349 A CN107478349 A CN 107478349A
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- CN
- China
- Prior art keywords
- input
- resistance
- electrically connected
- thermal resistance
- temperature
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
Abstract
The invention discloses the temperature polling instrument of thermometric instrument technical field,Including thermocouple sensor,The output end of the thermocouple sensor is electrically connected with the input of filter circuit,The input of the filter circuit is electrically connected with the output end of thermal resistance sensor,The temperature linearity to thermal resistance sensor signal is completed in 8751 single-chip microcomputers,Again by gathering the environment temperature corresponding to each test thermocouple,And temperature value collected is converted into data signal inside it and is sent into 8751 single-chip microcomputers,For carrying out cold-junction compensation to thermocouple,Keyboard is used for installation and debugging instrument,When needing to change current display way,It can be selected by keyboard,Display is used for collection point temperature display,The plant automation degree is high,It is simple to operate,Necessary concentration is carried out to input data using 8751 single-chip microcomputers,Processing and processing,It is used cooperatively using thermocouple and thermal resistance,Reduce error.
Description
Technical field
The present invention relates to thermometric instrument technical field, specially temperature polling instrument.
Background technology
Temperature is a critically important physical parameter, in nature any physics, chemical process all closely with temperature phase
Contact.In industrial processes, temperature sensing and control all directly and safety in production, product quality production efficiency, saving energy
The important technical economic indicator such as source is associated, therefore all by most attention in the every field of national economy.Temperature sensing
Instrument is also used widely as temperature measurement instrument.With the development of science and technology, the development of this kind of instrument also day
Crescent is different.In particular with the fast development of computer technology, the embedded system based on single-chip microcomputer has been widely used for
Industrial control field, intelligentized measuring and controlling instrument device is formd, so as to cause the fundamental change of instrument and meter structure, but
It is that existing temperature sensing equipment needs human intervention, complex operation, stability and precision are poor, and based on this, the present invention designs
Temperature polling instrument, to solve the above problems.
The content of the invention
It is an object of the invention to provide temperature polling instrument, is visited with the existing temperature for solving to propose in above-mentioned background technology
Measurement equipment needs the problem of human intervention, complex operation, stability and poor precision.
To achieve the above object, the present invention provides following technical scheme：Temperature polling instrument, including thermocouple sensor, institute
The output end for stating thermocouple sensor is electrically connected with the input of filter circuit, and the input of the filter circuit is electrically connected with heat
The output end of electric resistance sensor, the output end of the filter circuit are electrically connected with the input of amplifying circuit, the amplifying circuit
Output end be electrically connected with the inputs of CD4051 variable connectors, the output ends of the CD4051 variable connectors is electrically connected with
The input of AD0809 analog-digital converters, the output end of the AD0809 analog-digital converters are electrically connected with the input of 8751 single-chip microcomputers
End, the input of 8751 single-chip microcomputer are electrically connected with the output end of power module, and the output end of 8751 single-chip microcomputer is electrical
The input of drive module is connected, the input of display and keyboard is electrically connected in the output end of the drive module.
Preferably, the thermocouple sensor is electrically connected with by temperature-compensating wire and filter circuit.
Preferably, the one end of the thermal resistance sensor including thermal resistance Rt, the thermal resistance Rt is serially connected with resistance R4, institute
State the resistance R4 other end and be connected to resistance R3 and positive pole V0 output ports, the other end of the resistance R3 and be connected to resistance R2 and
Dc source E positive poles, the other end of the resistance R2 are simultaneously connected to negative pole V0 output ports and variable resistor R1, the variable resistor
The R1 other end is simultaneously connected to resistance R5, R6 and dc source E negative poles, and the other end of the resistance R5 and R6 is with thermal resistance Rt's
The other end concatenates.
Preferably, the thermal resistance Rt is RTD.
Preferably, No. 1 output port of the power module including transformer TR, the transformer TR is serially connected with wave filter
F, the other end of the wave filter F are simultaneously connected to electric capacity C1, C2 and W7805 voltage-stablizer, and the other end of the W7805 voltage-stablizers simultaneously connects
There are electric capacity C3, C4 and output port A, described electric capacity C1, C2, C3 and C4 other end and are grounded and No. 2 of transformer TR
Output port.
Preferably, the keyboard is non-coding formula keyboard.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is sensed by thermocouple sensor and thermal resistance
Device carries out the collection of temperature signal, and CD4051 variable connectors is sent into, by AD0809 moulds with after amplifying circuit after filtering
Become data signal after number converter and enter 8751 single-chip microcomputers, the temperature to thermal resistance sensor signal is completed in 8751 single-chip microcomputers
Degree linearisation, then by gathering the environment temperature corresponding to each test thermocouple, and the temperature value that will be collected inside it
It is converted into data signal and is sent into 8751 single-chip microcomputers, for carrying out cold-junction compensation to thermocouple, keyboard is used for installation and debugging instrument
Device, when needing to change current display way, it can be selected by keyboard, display is used for collection point temperature display, should
Plant automation degree is high, simple to operate, and necessary concentration, processing and processing are carried out to input data using 8751 single-chip microcomputers,
It is used cooperatively using thermocouple and thermal resistance, reduces error.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, used required for being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is principle of the invention block diagram；
Fig. 2 is thermal resistance sensor circuit diagram of the present invention；
Fig. 3 is power module circuitry figure of the present invention；
Fig. 4 is AD0809 analog-digital converters timing diagram of the present invention；
Fig. 5 is flow chart of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows：
1- thermocouple sensors, 2- thermal resistance sensors, 3- filter circuits, 4- amplifying circuits, 5-CD4051 variable connectors,
6-AD0809 analog-digital converters, 7-8751 single-chip microcomputers, 8- power modules, 9- drive modules, 10- displays, 11- keyboards.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1-5 are referred to, the present invention provides a kind of technical scheme：Temperature polling instrument, including thermocouple sensor 1, thermoelectricity
The output end of even sensor 1 is electrically connected with the input of filter circuit 3, and the input of filter circuit 3 is electrically connected with thermal resistance and passed
The output end of sensor 2, the output end of filter circuit 3 are electrically connected with the input of amplifying circuit 4, the output end electricity of amplifying circuit 4
Property connection CD4051 variable connectors 5 input, the output end of CD4051 variable connectors 5 is electrically connected with AD0809 analog-digital converters
6 input, the output end of AD0809 analog-digital converters 6 are electrically connected with the input of 8751 single-chip microcomputers 7,8751 single-chip microcomputers 7
Input is electrically connected with the output end of power module 8, and the output end of 8751 single-chip microcomputers 7 is electrically connected with the input of drive module 9,
The input of display 10 and keyboard 11 is electrically connected in the output end of drive module 9.
Wherein, thermocouple sensor 1 is electrically connected with by temperature-compensating wire and filter circuit 3, improves measurement accuracy, heat
Electric resistance sensor 2 includes thermal resistance Rt, and thermal resistance Rt one end is serially connected with resistance R4, and the resistance R4 other end is simultaneously connected to resistance R3
With positive pole V0 output ports, the resistance R3 other end is simultaneously connected to resistance R2 and dc source E positive poles, and the resistance R2 other end simultaneously connects
There are a negative pole V0 output ports and variable resistor R1, the variable resistor R1 other end is simultaneously connected to resistance R5, R6 and dc source E is born
Pole, the other end of the resistance R5 and R6 other end with thermal resistance Rt are concatenated, and wire can be eliminated by employing three-wire system connection
Error, thermal resistance Rt are RTD, and RTD has the characteristics that precision is high, stability is good, dependable performance, and this is due to platinum in oxygen
In the property changed medium, or even its physics, chemical property are all very stable at high temperature, in the range of 100-300 DEG C, platinum electricity
Almost journey is linear with temperature for the resistance variations of resistance, and power module 8 includes transformer TR, transformer TR No. 1 output port concatenation
There is wave filter F, the wave filter F other end is simultaneously connected to electric capacity C1, C2 and W7805 voltage-stablizer, and the other end of W7805 voltage-stablizers simultaneously connects
There are electric capacity C3, C4 and output port A, electric capacity C1, C2, C3 and C4 other end and are grounded and transformer TR No. 2 outputs
Port, keyboard 11 are non-coding formula keyboard.
One of the present embodiment has particular application as：By setting eight groups of thermocouple sensors 1 and eight groups of thermal resistance sensors 2
The collection of the temperature data of different location is realized, the filtered circuit 3 of signal of multi-channel sampling, amplifying circuit 4, CD4051 multichannels are opened
Close 5 and AD0809 analog-digital converters 6, changed by the control passage A/D of 8751 single-chip microcomputer 7, voltage signal is carried out in real time sampling and
A/D is changed, and 8751 single-chip microcomputers 7 carry out necessary concentration, processing and processing, measurement and note in temperature parameter to the data of input
Substantial amounts of conventional display and recording apparatus are then replaced in record, centralized watch is carried out to whole environment temperature；Wherein CD4051 multichannels
The S pins of switch 5 are gating end, only when S pins are low level, could gate a certain passage, make switch connection, A2~A0
Make switching channels input, when A2~A0 inputs 000~111, the switch corresponded to respectively on 0~7 passage is in closed form
State, usual S pins and A2~A0 signals are provided by a latch being connected on cpu data bus, can thus use output
Instruction realizes that channel selecting S leads ends and A2~A0 pins are required to input Transistor-Transistor Logic level signal, and each cmos switch is then used
CMOS Automatic level controls, logic level converting circuit are completed from Transistor-Transistor Logic level to the conversion of CMOS level, 8 I/O pins I/O0~I/
O7 can be used as input, and at this moment O/I pins are just used as output end, and switch realizes 8 to 1 selection function, due to cmos switch
It can also allow to input from O/I pins with two-way operation, i.e. signal, AD0809 analog-digital converters 6 select the passage currently changed, i.e.,
Channel number is sent on A0, A1 and A2 pin；Add a positive pulse on START and ALE pin, channel selecting code is deposited
And start A/D conversions, and negative pulse can be produced by performing OUT instructions, positive pulse is formed after inverted, also can be by timing circuit
Or programmable timer provides starting impulse；After conversion starts, EOC step-downs, after 64 clock cycle, after conversion end,
EOC is uprised；After conversion end, it can try to form a high level pulse on OE pin, it is slow to open output by performing IN instructions
The triple gate of device is rushed, the digital quantity allowed after conversion occurs on the data bus, and is read into accumulator, utilizes 8751 single-chip microcomputers
7 processing.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
At least one implementation of the present invention is contained in reference to specific features, structure, material or the feature that the embodiment or example describe
In example or example.In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.
Moreover, specific features, structure, material or the feature of description can close in any one or more embodiments or example
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All details are described, it is only described embodiment also not limit the invention.Obviously, according to the content of this specification,
It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (6)
1. temperature polling instrument, including thermocouple sensor (1), it is characterised in that：The output end electricity of the thermocouple sensor (1)
Property connection filter circuit (3) input, the input of the filter circuit (3) is electrically connected with the defeated of thermal resistance sensor (2)
Go out end, the output end of the filter circuit (3) is electrically connected with the input of amplifying circuit (4), the output of the amplifying circuit (4)
End is electrically connected with the input of CD4051 variable connectors (5), and the output end of the CD4051 variable connectors (5) is electrically connected with
The input of AD0809 analog-digital converters (6), the output end of the AD0809 analog-digital converters (6) are electrically connected with 8751 single-chip microcomputers
(7) input, the input of 8751 single-chip microcomputer (7) are electrically connected with the output end of power module (8), 8751 monolithic
The output end of machine (7) is electrically connected with the input of drive module (9), and the output end of the drive module (9) is electrically connected
The input of display (10) and keyboard (11).
2. temperature polling instrument according to claim 1, it is characterised in that：The thermocouple sensor (1) is mended by temperature
Wire is repaid to be electrically connected with filter circuit (3).
3. temperature polling instrument according to claim 1, it is characterised in that：The thermal resistance sensor (2) includes thermal resistance
Rt, the thermal resistance Rt one end are serially connected with resistance R4, and the other end of the resistance R4 is simultaneously connected to resistance R3 and positive pole V0 outputs
Port, the other end of the resistance R3 are simultaneously connected to resistance R2 and dc source E positive poles, and the other end of the resistance R2 is simultaneously connected to negative
Pole V0 output ports and variable resistor R1, the other end of the variable resistor R1 are simultaneously connected to resistance R5, R6 and dc source E is born
Pole, the other end of the other end of the resistance R5 and R6 with thermal resistance Rt concatenate.
4. temperature polling instrument according to claim 3, it is characterised in that：The thermal resistance Rt is RTD.
5. temperature polling instrument according to claim 1, it is characterised in that：The power module (8) includes transformer TR, institute
No. 1 output port for stating transformer TR is serially connected with wave filter F, the other end of the wave filter F and be connected to electric capacity C1, C2 and
W7805 voltage-stablizers, the other end of the W7805 voltage-stablizers and be connected to electric capacity C3, C4 and output port A, the electric capacity C1, C2,
The C3 and C4 other end and be grounded and transformer TR No. 2 output ports.
6. temperature polling instrument according to claim 1, it is characterised in that：The keyboard (11) is non-coding formula keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710684200.7A CN107478349A (en) | 2017-08-11 | 2017-08-11 | Temperature polling instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710684200.7A CN107478349A (en) | 2017-08-11 | 2017-08-11 | Temperature polling instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107478349A true CN107478349A (en) | 2017-12-15 |
Family
ID=60599297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710684200.7A Pending CN107478349A (en) | 2017-08-11 | 2017-08-11 | Temperature polling instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107478349A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507692A (en) * | 2018-04-08 | 2018-09-07 | 潍坊学院 | The analysis system and method for temperature in Filling Processes of Castings and process of setting |
| CN109932074A (en) * | 2019-03-04 | 2019-06-25 | 佛山华芯微特科技有限公司 | A kind of temperature controller temperature measurement circuit |
| CN112177757A (en) * | 2020-09-18 | 2021-01-05 | 广州联优科技有限公司 | Protection device of ship engine |
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| CN2864634Y (en) * | 2005-12-23 | 2007-01-31 | 保定天威集团有限公司 | Intelligent temperature patrol detector |
| US20090122831A1 (en) * | 2007-11-14 | 2009-05-14 | Ema Electronics Corp. | Intelligent flow/temperature measuring device |
| CN201314846Y (en) * | 2008-12-25 | 2009-09-23 | 李峰 | Temperature inspecting instrument |
| CN201748983U (en) * | 2010-06-21 | 2011-02-16 | 江苏安科瑞电器制造有限公司 | Integrated signal intelligent temperature transmitter |
| CN102297730A (en) * | 2011-05-23 | 2011-12-28 | 国网电力科学研究院 | Multi-channel general temperature measurement module |
| CN202974486U (en) * | 2012-12-30 | 2013-06-05 | 深圳市显控自动化技术有限公司 | Thermocouple and thermal resistor hybrid accessed measuring circuit |
| CN104359580A (en) * | 2014-12-09 | 2015-02-18 | 南京化工职业技术学院 | Thermal resistance temperature itinerant detector |
| CN204373804U (en) * | 2015-02-07 | 2015-06-03 | 杭州国望科技有限公司 | Temperature polling instrument |
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2017
- 2017-08-11 CN CN201710684200.7A patent/CN107478349A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2864634Y (en) * | 2005-12-23 | 2007-01-31 | 保定天威集团有限公司 | Intelligent temperature patrol detector |
| US20090122831A1 (en) * | 2007-11-14 | 2009-05-14 | Ema Electronics Corp. | Intelligent flow/temperature measuring device |
| CN201314846Y (en) * | 2008-12-25 | 2009-09-23 | 李峰 | Temperature inspecting instrument |
| CN201748983U (en) * | 2010-06-21 | 2011-02-16 | 江苏安科瑞电器制造有限公司 | Integrated signal intelligent temperature transmitter |
| CN102297730A (en) * | 2011-05-23 | 2011-12-28 | 国网电力科学研究院 | Multi-channel general temperature measurement module |
| CN202974486U (en) * | 2012-12-30 | 2013-06-05 | 深圳市显控自动化技术有限公司 | Thermocouple and thermal resistor hybrid accessed measuring circuit |
| CN104359580A (en) * | 2014-12-09 | 2015-02-18 | 南京化工职业技术学院 | Thermal resistance temperature itinerant detector |
| CN204373804U (en) * | 2015-02-07 | 2015-06-03 | 杭州国望科技有限公司 | Temperature polling instrument |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507692A (en) * | 2018-04-08 | 2018-09-07 | 潍坊学院 | The analysis system and method for temperature in Filling Processes of Castings and process of setting |
| CN109932074A (en) * | 2019-03-04 | 2019-06-25 | 佛山华芯微特科技有限公司 | A kind of temperature controller temperature measurement circuit |
| CN112177757A (en) * | 2020-09-18 | 2021-01-05 | 广州联优科技有限公司 | Protection device of ship engine |
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Application publication date: 20171215 |
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