CN101846558A - Main board for thermometer and thermocouple precision correcting method - Google Patents
Main board for thermometer and thermocouple precision correcting method Download PDFInfo
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- CN101846558A CN101846558A CN201010200531A CN201010200531A CN101846558A CN 101846558 A CN101846558 A CN 101846558A CN 201010200531 A CN201010200531 A CN 201010200531A CN 201010200531 A CN201010200531 A CN 201010200531A CN 101846558 A CN101846558 A CN 101846558A
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- thermopair
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Abstract
The invention relates to a main board for a thermometer and a thermocouple precision correcting method; the main board comprises a main control circuit consisting of a microprocessor, a dial-up input circuit, an interface circuit with at least two slots and a thermocouple sampling circuit; the invention controls the line structure of the sampling circuit with an A/D conversion circuit, reduces the line interference between digital and analog circuits, adds a zero calibration compensation circuit on the front end of the A/D conversion circuit and improves the accuracy of temperature measurement; the invention has the benefits that a bus-type interface circuit is adopted, and a plurality of interface circuit sockets are arranged to realize the extendibility of functions; the A/D conversion circuit is connected with the control end of the analog circuit, thereby reducing the connecting lines between the digital and the analog circuits, reducing the interference of the analog circuit to the digital circuit, and improving the work reliability; and the invention adds the zero calibration compensation circuit, so that when a zero point tends to be negative, the adjustment is very convenient, thereby preventing nonlinear zero-crossing error, and improving the accuracy of temperature measurement.
Description
Technical field
The invention belongs to metallurgical furnace thermal technology temperature measuring equipment, particularly a kind of main board for thermometer and thermocouple precision correcting method.
Background technology
Metal smelting liquation temperature measurer is because the measure field working condition is complicated so used temperature measurer must be simple to operate, reliable and stable at present; And present temperature measurer often needs setup parameter, what the setting of its parameter was adopted is row's formula multidigit dial, need open cabinet operates on mainboard, both inconvenience was also dangerous, and the interface circuit of mainboard does not have extended function, along with development of technology need constantly increase function, so the interface circuit on the mainboard should satisfy the needs of expansion.And the thermocouple measurement accuracy correction of present mainboard, also continuing to use traditional mimic channel proofreaies and correct, needing to regulate in the mainboard potentiometer of control circuit in calibration proofreaies and correct, in use because vibration, subtle change can take place in the resistance of potentiometer, because this subtle change has changed correcting potential, and then the measuring accuracy that measuring error influences thermometric occurs.
Summary of the invention
The objective of the invention is to propose a kind of main board for thermometer and thermocouple precision correcting method technical scheme, this scheme adopts the serial interface bus mode that a plurality of interface board sockets are set on mainboard, realized that parameter setup key commonly used breaks away from mainboard, increased the measuring accuracy that the zero correction circuit has improved thermopair, employing is revolved yard dial and is replaced row's formula multidigit dial, reduces the digital line that intersects with analog line and has reduced the interference of mimic channel to digital circuit.
For achieving the above object, technical scheme of the present invention is: a kind of main board for thermometer, comprise the governor circuit and the peripheral circuit that contain microprocessor, and described peripheral circuit comprises the dial-up input circuit and has interface circuit, the thermopair sample circuit of two slots at least; Described thermopair sample circuit comprises Temperature Measure Control circuit, A/D change-over circuit and school zero-compensation circuit;
Described Temperature Measure Control circuit comprises two-way multi-position switch and reference power supply, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier, have at least the active pull-up of leading up to dividing potential drop to insert a current potential in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein another road connect the thermopair input;
Described school zero-compensation circuit comprises a multidigit selector switch and voltage divider, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four selects a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, and the selected then end of the multidigit of one tunnel selecting side connects the different partial pressure potential of voltage divider respectively.
Described interface circuit is a serial bus interface circuit.
Described voltage divider is to be connected to form with power supply by a plurality of resistance series connection.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described thermopair standard correction full scale current potential.
The control end of the multidigit selector switch in the two-way multi-position switch in the described Temperature Measure Control circuit and the school zero-compensation circuit is connected with the control of A/D change-over circuit output.
Described dial-up input circuit is to revolve code-disc dial-up input circuit.
Described slot is the two-sided straight cutting grooves of 26 lines.
A kind of main board for thermometer thermocouple precision correcting method comprises the correction of zero correction and thermopair full scale, and concrete steps comprise:
A. receive one zero point current potential, promptly governor circuit by control thermometric control circuit output zero potential to microprocessor;
B. judge whether to be negative potential that if negative potential, microprocessor outputs a control signal to A/D change-over circuit change amplifier reference point position and is positive potential;
C. the overgauge current potential that records is deposited to the zero correction register;
D. measure a demarcation thermopair potential value;
The demarcation thermopair potential value that e. will record deducts the data in the zero correction register, obtains the thermopair full scale value;
Thermocouple measurement accuracy correction step is:
F., an electric thermo-couple temperature and electric potential relation table are set;
G. measure one and demarcate current potential, according to formula: demarcate thermopair potential value={ (AD-AD
Z) ÷ (AD
f-AD
Z) * K, demarcate the constant K value, wherein AD is for demarcating current potential, and described demarcation current potential equals to demarcate the thermopair potential value, AD
fBe temperature full scale corrected value, AD
ZBe thermometer value at zero point;
H. temperature value measured is passed through formula according to measuring the thermopair potential value: thermopair potential value={ (ADe-AD
Z) ÷ (AD
f-AD
Z) * K obtains from relation table, and wherein ADe is the actual kinetic measurement value of thermopair current potential;
Pairing different potentials value table when described electric thermo-couple temperature and electric potential relation table are calibration number for the thermopair different temperatures of S or R or B or WRe.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described demarcation thermopair potential value.
The invention has the beneficial effects as follows:
1. the present invention adopts the bus type interface circuit, is provided with a plurality of interface circuit sockets and has realized the extendible of function;
2. the present invention adopts the A/D change-over circuit to be connected with the control end of mimic channel, and the line that has reduced digital circuit and mimic channel has reduced the interference of mimic channel to digital circuit, has improved the reliability of work;
3. the present invention has added school zero-compensation circuit and makes and can adjust very easily when bearing partially zero point, has avoided the zero crossing nonlinearity erron, has improved thermometric accuracy;
4. the present invention is simple in structure, and is easy to operate.
Below in conjunction with drawings and Examples the present invention is made a detailed description.
Description of drawings
Fig. 1 is a logic diagram of circuit of the present invention;
Fig. 2 is Temperature Measure Control of the present invention and school zero-compensation circuit diagram.
Embodiment
Embodiment 1:
A kind of main board for thermometer embodiment, referring to Fig. 1 and Fig. 2, described mainboard comprises governor circuit 1 and the peripheral circuit that contains microprocessor, described peripheral circuit comprises dial-up input circuit 2 and has interface circuit, the thermopair sample circuit 4 of two slots 3 at least; Described thermopair sample circuit comprises Temperature Measure Control circuit 4-1, A/D change-over circuit 4-2 and school zero-compensation circuit 4-3; Described slot is the two-sided straight cutting grooves of 26 lines, and present embodiment is three the 26 two-sided straight cutting grooves of line.
Described Temperature Measure Control circuit comprises two-way multi-position switch 4-1-1 and reference power supply 4-1-2, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier 4-4, have at least the active pull-up of leading up to dividing potential drop to insert a current potential (passing through resistance R 1 and R1 series connection power supply dividing potential drop among the embodiment) in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein connect thermopair 7 in another road;
Described school zero-compensation circuit comprises a multidigit selector switch 4-3-1 and voltage divider 4-3-2, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four selects a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, the selected then end of the multichannel of one tunnel selecting side connects the partial pressure potential of voltage divider respectively, and described voltage divider is to connect to form (being to connect and power supply connects to form by R3R4, R5 among the embodiment) with power supply by a plurality of resistance series connection back; Adopt the purpose of school zero-compensation circuit to be: when the inclined to one side negative value of current potential at zero point, by the reference potential that changes amplifier make its zero point drift on the occasion of, carry out digital school zero by program then, the method had solved when zero point, current potential was negative value, though can the school zero by numeral, current potential can produce the zero crossing nonlinearity erron when measuring, with zero deviation be modulated on the occasion of, make its measured value be in linearity all the time, reduced measuring error.
What microprocessor was selected for use described in the embodiment is ATMEGA162 eight bit microprocessors, what the A/D converter of described A/D change-over circuit was selected for use is 18 A/D converters of MAX132, and what described two-way multi-position switch and multidigit selector switch were selected for use is that 4052 two-ways four select a noncontacting switch.
Described interface circuit is a serial bus interface circuit, and it is to be driven by the bus driver 5 that connects microprocessor, and the model that the present embodiment driver adopts is SN75452B.
Described dial-up input circuit is to revolve code-disc 6 dial-up input circuits, and code-disc is revolved in six of present embodiment employings and 74LS165 has formed the dial-up input circuit.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described thermopair standard correction full scale current potential.
The control end of the multidigit selector switch in the two-way multidigit selector switch in the described Temperature Measure Control circuit and the described school zero-compensation circuit is connected with the control of A/D change-over circuit output, 18 A/D converters of MAX132 have four control outputs among the embodiment, per two with four control outputs connect two multidigit selector switch respectively, therefore artificial circuit part does not have data line in wiring board, and data line only is connected to A/D converter, reduce the phase mutual interference of digital-to-analogue, improved the stability and the reliability of measuring process.
Embodiment 2:
A kind of main board for thermometer thermocouple precision correcting method embodiment, referring to embodiment 1: this method comprises that zero correction and thermopair full scale proofread and correct, and concrete steps comprise:
A. receive one zero point current potential, promptly governor circuit by control thermometric control circuit output zero potential to microprocessor;
B. judge whether to be negative potential that if negative potential, microprocessor outputs a control signal to A/D change-over circuit change amplifier reference point position and is positive potential;
C. the overgauge current potential that records is deposited to the zero correction register;
D. measure a demarcation thermopair potential value;
The demarcation thermopair potential value that e. will record deducts the data in the zero correction register, obtains the thermopair full scale value;
Thermocouple measurement accuracy correction step is:
F., an electric thermo-couple temperature and electric potential relation table are set;
G. measure one and demarcate current potential, according to formula: demarcate thermopair potential value={ (AD-AD
Z) ÷ (AD
f-AD
Z) * K, demarcate the constant K value, wherein AD is for demarcating current potential, and described demarcation current potential equals to demarcate the thermopair potential value, AD
fBe temperature full scale corrected value, AD
ZBe thermometer value at zero point;
H. temperature value measured is passed through formula according to measuring the thermopair potential value: thermopair potential value={ (ADe-AD
Z) ÷ (AD
f-AD
Z) * K obtains from relation table, and wherein ADe is the actual kinetic measurement value of thermopair current potential;
Pairing different potentials value table when described electric thermo-couple temperature and electric potential relation table are calibration number for the thermopair different temperatures of S or R or B or WRe.
To be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described demarcation thermopair potential value.
Pairing different potentials value table when described electric thermo-couple temperature and electric potential relation table are calibration number for the thermopair different temperatures of S or R or B or WRe; Electric thermo-couple temperature and electric potential relation table are a kind of known charts, can find in standardized product especially for above its corresponding relation quite stable of pyrometer couple of 1500 degree of metallic solution.
This kind method is when the inclined to one side negative value of current potential at zero point, by the reference potential that changes amplifier make its zero point drift on the occasion of, carry out digital school zero by program then, the method had solved when zero point, current potential was negative value, though can the school zero by numeral, current potential can produce the zero crossing nonlinearity erron when measuring, with zero deviation be modulated on the occasion of, make its measured value be in linearity all the time, reduced measuring error.
Claims (9)
1. a main board for thermometer comprises the governor circuit and the peripheral circuit that contain microprocessor, it is characterized in that, described peripheral circuit comprises the dial-up input circuit and has interface circuit, the thermopair sample circuit of two slots at least; Described thermopair sample circuit comprises Temperature Measure Control circuit, A/D change-over circuit and school zero-compensation circuit; Described Temperature Measure Control circuit comprises two-way multi-position switch and reference power supply, and wherein reference power supply provides the standard correction full scale current potential and the zero potential of thermopair; Described two-way multi-position switch is that two-way four selects a non-contact switch circuit, wherein the selecting side X of a way switch connects the thermopair input, another selecting side, road Y is connected to the A/D change-over circuit through amplifier, have at least the active pull-up of leading up to dividing potential drop to insert a current potential in the four tunnel selected ends of selecting side X, the four tunnel selected ends of selecting side Y wherein one the tunnel connect reference power supply, and the four tunnel selected ends of selecting side Y wherein another road connect the thermopair input; Described school zero-compensation circuit comprises a multidigit selector switch and by voltage divider, described multidigit selector switch is that two-way four selects a non-contact switch circuit, two-way four selects a road of a non-contact switch circuit to select the reference potential input end of the described amplifier of termination, and the selected then end of the multidigit of one tunnel selecting side connects the different partial pressure potential of voltage divider respectively.
2. a kind of main board for thermometer according to claim 1 is characterized in that described interface circuit is a serial bus interface circuit.
3. a kind of main board for thermometer according to claim 1 is characterized in that, described voltage divider is to be connected to form with power supply by a plurality of resistance series connection back.
4. a kind of main board for thermometer according to claim 1 is characterized in that, to be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described thermopair standard correction full scale current potential.
5. a kind of main board for thermometer according to claim 1 is characterized in that, the control end of the multidigit selector switch in the two-way multi-position switch in the described Temperature Measure Control circuit and the described school zero-compensation circuit is connected with the control of A/D change-over circuit output.
6. a kind of main board for thermometer according to claim 1 is characterized in that, described dial-up input circuit is to revolve code-disc dial-up input circuit.
7. a kind of main board for thermometer according to claim 1 is characterized in that, described slot is the two-sided straight cutting grooves of 26 lines.
8. a main board for thermometer thermocouple precision correcting method is characterized in that, comprises the correction of zero correction and thermopair full scale, and concrete steps comprise:
A. receive one zero point current potential, promptly governor circuit by control thermometric control circuit output zero potential to microprocessor;
B. judge whether to be negative potential that if negative potential, microprocessor outputs a control signal to A/D change-over circuit change amplifier reference point position and is positive potential;
C. the overgauge current potential that records is deposited to the zero correction register;
D. measure a demarcation thermopair potential value;
The demarcation thermopair potential value that e. will record deducts the data in the zero correction register, obtains the thermopair full scale value;
Thermocouple measurement accuracy correction step is:
F., an electric thermo-couple temperature and electric potential relation table are set;
G. measure one and demarcate current potential, according to formula: demarcate thermopair potential value={ (AD-AD
Z) ÷ (AD
f-AD
Z) * K, demarcate the constant K value, wherein AD is for demarcating current potential, and described demarcation current potential equals to demarcate the thermopair potential value, AD
fBe temperature full scale corrected value, AD
ZBe thermometer value at zero point;
H. temperature value measured is passed through formula according to measuring the thermopair potential value: thermopair potential value={ (ADe-AD
Z) ÷ (AD
f-AD
Z) * K obtains from relation table, and wherein ADe is the actual kinetic measurement value of thermopair current potential;
Pairing different potentials value table when described electric thermo-couple temperature and electric potential relation table are calibration number for the thermopair different temperatures of S or R or B or WRe.
9. a kind of main board for thermometer thermocouple precision correcting method according to claim 8 is characterized in that, to be calibration number number be the 33mv of WRe thermopair for the 16.777mv of S or R or B thermopair or 18mv or calibration to described demarcation thermopair potential value.
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| CN2010102005317A CN101846558B (en) | 2010-06-13 | 2010-06-13 | Main board for thermometer and thermocouple precision correcting method |
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| CN2010102005317A CN101846558B (en) | 2010-06-13 | 2010-06-13 | Main board for thermometer and thermocouple precision correcting method |
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| CN101846558A true CN101846558A (en) | 2010-09-29 |
| CN101846558B CN101846558B (en) | 2011-12-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013185367A1 (en) * | 2012-06-13 | 2013-12-19 | 深圳市理邦精密仪器股份有限公司 | Self-calibration temperature control device and method |
| CN105352623A (en) * | 2015-12-14 | 2016-02-24 | 重庆川仪自动化股份有限公司 | Method for improving precision of thermal resistance temperature transmitter |
| CN114264374A (en) * | 2021-12-27 | 2022-04-01 | 西南交通大学 | Temperature measurement calibration method for metal wire rapid heating equipment |
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| CN2556618Y (en) * | 2002-06-21 | 2003-06-18 | 北京市科海龙华工业自动化仪器有限公司 | Self correcting metal liquid quick temperature detector |
| CN2636216Y (en) * | 2003-08-26 | 2004-08-25 | 北京市科海龙华工业自动化仪器有限公司 | Check device for work state of microcomputer molten steel temp detector |
| US7648270B2 (en) * | 2004-04-02 | 2010-01-19 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Temperature measurement of an integrated circuit |
| CN201716129U (en) * | 2010-06-13 | 2011-01-19 | 北京市科海龙华工业自动化仪器有限公司 | Main board for thermodetector |
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2010
- 2010-06-13 CN CN2010102005317A patent/CN101846558B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2556618Y (en) * | 2002-06-21 | 2003-06-18 | 北京市科海龙华工业自动化仪器有限公司 | Self correcting metal liquid quick temperature detector |
| CN2636216Y (en) * | 2003-08-26 | 2004-08-25 | 北京市科海龙华工业自动化仪器有限公司 | Check device for work state of microcomputer molten steel temp detector |
| US7648270B2 (en) * | 2004-04-02 | 2010-01-19 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Temperature measurement of an integrated circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013185367A1 (en) * | 2012-06-13 | 2013-12-19 | 深圳市理邦精密仪器股份有限公司 | Self-calibration temperature control device and method |
| CN105352623A (en) * | 2015-12-14 | 2016-02-24 | 重庆川仪自动化股份有限公司 | Method for improving precision of thermal resistance temperature transmitter |
| CN105352623B (en) * | 2015-12-14 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Method for improving precision of thermal resistance temperature transmitter |
| CN114264374A (en) * | 2021-12-27 | 2022-04-01 | 西南交通大学 | Temperature measurement calibration method for metal wire rapid heating equipment |
| CN114264374B (en) * | 2021-12-27 | 2023-08-25 | 西南交通大学 | Temperature measurement and calibration method for metal wire rapid heating equipment |
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| CN101846558B (en) | 2011-12-14 |
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Denomination of invention: Main board for thermometer and thermocouple precision correcting method Effective date of registration: 20130711 Granted publication date: 20111214 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: Kehai Longhua Industry Automation Instrument Co., Ltd., Beijing Registration number: 2013990000448 |
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