CN101750171B - Thermocouple verification system - Google Patents
Thermocouple verification system Download PDFInfo
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- CN101750171B CN101750171B CN2009102510807A CN200910251080A CN101750171B CN 101750171 B CN101750171 B CN 101750171B CN 2009102510807 A CN2009102510807 A CN 2009102510807A CN 200910251080 A CN200910251080 A CN 200910251080A CN 101750171 B CN101750171 B CN 101750171B
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Abstract
The invention provides a thermocouple verification system, which can simultaneously verify thermocouples of a plurality of furnaces. The verification system comprises an upper computer, a multichannel data collector and at least a temperature control circuit. A temperature control thermocouple, a standard thermocouple and a verified thermocouple are internally arranged during the work of a to-be-verified heating furnace; the temperature control circuit is electrically connected with the state output end of the temperature control thermocouple in the to-be-verified heating furnace and used for real-time monitoring to the temperature control thermocouple and real-time control to the temperature of the to-be-verified heating furnace according to the state data of the temperature control thermocouple; the multichannel data collector is electrically connected with the state output ends of the verified thermocouple and the standard thermocouple in the to-be-verified heating furnace and used for collecting the state data of the verified thermocouple and the standard thermocouple and outputting the state data to the upper computer; and the upper computer finishes verifying the verified thermocouple through processing the state data of the verified thermocouple and the standard thermocouple. The invention greatly improves the verification efficiency as well as and the expandability, the real time, the accuracy and the safety compared with the prior art.
Description
Technical field
The present invention relates to the thermocouple calibration technical field, a kind of thermocouple verification system of specific design.
Background technology
Temperature survey is the key link of most of Industry Control, and its implementation normally contacts temperature sensor or immerse with solid surface to be measured and treats fluid measured, to obtain its temperature parameter.Thermopair is one of most widely used temperature sensor in commercial production, thermocouple sensor is made of two kinds of different metals, their end is fixed together and forms a responsive knot, will have corresponding thermoelectrical potential to produce during temperature variation, can be known the temperature of measured object by this thermoelectrical potential.The quality of thermopair is directly connected to the product quality that commercial production is come out, and according to national metrological regulations, thermopair is as the temperature measurement device, and necessary periodic verification is so the calibrating installation of exploitation thermopair is very important.
In the prior art, have only the calibration equipment of manual control or the calibration equipment of single channel control.There is following shortcoming in prior art:
The calibration equipment of manual control or single channel control, because the interior tested thermopair of an at every turn many-one calibrating heating furnace is examined and determine, the heat-insulating property of in addition examining and determine heating furnace is fairly good, causing the calibrating heating furnace to reduce to room temperature from high temperature needs very long ineffective time.Therefore, its work efficiency is quite low, does not fit into the needs of large-scale production development.
Existing single channel control verification equipment adopts standard couple as the temperature control idol usually, though can carry out Automatic Control and data processing, reliability and real-time are not high.
Poor stability, accidents caused easily.Owing to be separate unit control and assay furnace power big (momentary current reaches 20A), necessary rewiring when at every turn changing assay furnace causing that easily sparking causes security incident.
Summary of the invention
In view of this, in order to address the above problem, for this reason, the present invention proposes a kind of thermocouple verification system, can examine and determine the thermopair of many stoves simultaneously.
The object of the present invention is achieved like this: thermocouple verification system, described thermocouple verification system are used to connect one or more calibrating heating furnaces and carry out thermocouple calibration, comprise host computer, multi-channel data acquisition device and at least one temperature-adjusting circuit; Built-in temperature controlling thermopair, standard couple and tested thermopair when described calibrating heating furnace is worked; Each temperature-adjusting circuit is electrically connected with temperature-control heat couple state output end in the calibrating heating furnace respectively, and described temperature-adjusting circuit is monitored in real time to temperature-control heat couple, according to the status data of temperature-control heat couple, the temperature of this calibrating heating furnace is controlled in real time; The tested thermopair that described multi-channel data acquisition device is interior with examining and determine heating furnace and the state output end of standard couple are electrically connected; Described multi-channel data acquisition device is gathered the status data of tested thermopair and standard couple and is outputed to host computer, and described host computer is finished the calibrating to tested thermopair by the status data of tested thermopair and standard couple is handled.
Further, described temperature-adjusting circuit comprises preposing signal process circuit and control circuit, and described preposing signal process circuit is gathered the status signal of temperature-control heat couple, after amplification, filtering and A/D conversion, outputs to control circuit;
Further, described preposing signal process circuit comprises first amplifying circuit, filtering circuit, ambient-temperature compensation Acquisition Circuit, second amplifying circuit, multi-channel electronic switch and A/D change-over circuit; Described first amplifying circuit receives the status signal of temperature-control heat couple and amplifies, and after filtering circuit filtering, outputs to the A/D change-over circuit by multi-channel electronic switch again; Described ambient-temperature compensation Acquisition Circuit is gathered the signal of room temperature, after second amplifying circuit amplifies, outputs to the A/D change-over circuit by multi-channel electronic switch;
Further, described preposing signal process circuit also comprises first voltage follower and second voltage follower, described first voltage follower is arranged between filtering circuit and the multi-channel electronic switch, and described second voltage follower is arranged between second amplifying circuit and the multi-channel electronic switch;
Further, described control circuit comprises single chip circuit and calibrating Heating Furnace Control circuit, described single chip circuit receives the temperature-control heat couple of A/D change-over circuit output and the status data of room temperature, according to default proving temperature, the heating-up temperature of calibrating heating furnace is controlled by calibrating Heating Furnace Control circuit;
Further, be provided with a relay in the electric power loop of calibrating heating furnace, calibrating Heating Furnace Control circuit is the frequency range modulation circuit, and described single chip circuit output is to the control signal of calibrating heating furnace, after the frequency range modulating circuit modulates, output to the relay in the electric power loop of examining and determine heating furnace;
Further, be provided with a relay in the electric power loop of calibrating heating furnace, the temperature that described single chip circuit detects temperature-control heat couple is during greater than threshold value, sends the relay of cut-off signals in the calibrating heating furnace electric power loop, cuts off the power supply of calibrating heating furnace.
Further, also comprise an overvoltage crowbar in the described treatment circuit, described overvoltage crowbar compares the temperature data of temperature-control heat couple and the ultimate temperature value of heating furnace operate as normal, if the temperature data of temperature-control heat couple is greater than the ultimate temperature value of heating furnace operate as normal, then send cut-off signals to the relay of examining and determine in the heating furnace electric power loop, cut off the power supply of calibrating heating furnace;
Further, described single chip circuit is connected with host computer, and described upper computer detection is to the temperature of standard couple during greater than threshold value, and the control single chip computer circuit sends the relay of cut-off signals in the calibrating heating furnace electric power loop, cuts off the power supply of calibrating heating furnace.
The present invention is with respect to prior art, has following advantage: thermocouple verification system of the present invention, can gather the status data of the tested thermopair in a plurality of calibrating heating furnaces simultaneously by the multi-channel data acquisition device, and handle by host computer, its extendability is strong, need do simple modification to the acquisition controlling program of host computer for basic when adding the calibrating heating furnace, and host computer adopts PC usually, its processing power also can satisfy the calibrating to the tested thermopair in a plurality of calibrating heating furnaces, greatly improves calibrating efficient; In the calibrating heating furnace, temperature-control heat couple and standard couple are set respectively, the time-delay influence of multi-channel data acquisition data device when having avoided adopting standard couple as temperature-control heat couple; Each is examined and determine heating furnace and is respectively arranged with independently temperature-adjusting circuit, and different calibrating heating furnaces can be examined and determine the tested thermopair of different model; In further technical scheme, also be provided with three kinds of overvoltage protection measures, guarantee the security of total system.
Other advantages of the present invention, target, to set forth in the following description to a certain extent with feature, and to a certain extent,, perhaps can obtain instruction from the practice of the present invention based on being conspicuous to those skilled in the art to investigating hereinafter.Target of the present invention and other advantages can be passed through following instructions, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 1 shows the structural representation of thermocouple verification system.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.
Referring to Fig. 1, the thermocouple verification system of present embodiment is used to connect one or more calibrating heating furnaces 7 and carries out thermocouple calibration, comprise host computer 4, multi-channel data acquisition device 5 with the identical temperature-adjusting circuit 6 of calibrating heating furnace quantity.Built-in tested thermopair 8, temperature-control heat couple 9 and standard couple 10 when described calibrating heating furnace 7 is worked; Described each temperature-adjusting circuit 6 is electrically connected with the state output end of temperature-control heat couple 9 in the calibrating heating furnace 7 respectively, 6 pairs of temperature-control heat couple 9 of described temperature-adjusting circuit are monitored in real time, according to the status data of temperature-control heat couple 9, the temperature of this calibrating heating furnace 7 is controlled in real time; The tested thermopair 8 in described multi-channel data acquisition device 5 and each calibrating heating furnace 7 and the state output end of standard couple 10 are electrically connected; Described multi-channel data acquisition device 5 is gathered the status data of tested thermopair and standard couple and is outputed to host computer 4, and the status data of 4 pairs of tested thermopairs of described host computer and standard couple is handled; Default proving temperature, after calibrating heating furnace temperature control was stabilized in this proving temperature, the temperature deviation of host computer 4 standard of comparison thermopairs and tested thermopair with reference to the calibrating standard, thereby determined that whether qualified the spare part thermopair is, realizes the calibrating of tested thermopair.
Concrete, described temperature-adjusting circuit 6 comprises preposing signal process circuit 1 and control circuit 2, described preposing signal process circuit 1 is gathered the status signal of temperature-control heat couple 9, after amplification, filtering and A/D conversion, outputs to control circuit 2; Described preposing signal process circuit 1 comprises first amplifying circuit 11, filtering circuit 12, ambient-temperature compensation Acquisition Circuit 13, second amplifying circuit 14, first voltage follower 15, second voltage follower 16, multi-channel electronic switch 17 and A/D change-over circuit 18; Described first amplifying circuit 11 receives the status signal of temperature-control heat couple and amplifies, again after filtering circuit 12 filtering, successively by outputing to the A/D change-over circuit behind first voltage follower 15 and the multi-channel electronic switch 17; Described ambient-temperature compensation Acquisition Circuit 13 is gathered the signal of room temperature, after second amplifying circuit 14 amplifies, successively by outputing to A/D change-over circuit 18 behind second voltage follower 16 and the multi-channel electronic switch 17;
Described control circuit 2 comprises single chip circuit 21 and calibrating Heating Furnace Control circuit 22, described single chip circuit 21 receives the temperature-control heat couple of A/D change-over circuit 18 outputs and the status data of room temperature, according to default proving temperature, the heating-up temperature of calibrating heating furnace is controlled by calibrating Heating Furnace Control circuit; Described calibrating Heating Furnace Control circuit 22 is a PWM frequency range modulation circuit, can realize by the CPLD programmable logic device (PLD); Be provided with a relay 23 in the electric power loop of described each calibrating heating furnace, described single chip circuit 21 outputs are to the control signal of calibrating heating furnace, the interval conducting that the PWM Waveform Control that PWM frequency range modulation circuit is converted into certain dutycycle with the control signal of single-chip microcomputer output is used for relay 23 with end, realize the calibrating furnace temperature of heating furnace is added the control of heat; Described single chip circuit 21 also is connected with host computer 4 by usb hub 3, with intercommunication mutually; EEPROM also can be set in the single chip circuit 21 controlled variable of single-chip microcomputer output is preserved, and input and output device is set, with the temperature in default proving temperature and the heating furnace of output calibrating in real time.
The thermoelectric verification system of present embodiment adopts three grades of overvoltage protections:
The temperature that described single chip circuit 21 detects temperature-control heat couple is during greater than the maximal value of default proving temperature scope, sends the relay 23 of cut-off signals in the calibrating heating furnace electric power loop, cuts off the power supply of calibrating heating furnace;
Also comprise an overvoltage crowbar 24 in the described control circuit 2, described overvoltage crowbar 24 compares the temperature data of temperature-control heat couple and the ultimate temperature value of heating furnace operate as normal, if the temperature data of temperature-control heat couple 9 is greater than the ultimate temperature value of heating furnace operate as normal, then send cut-off signals to the relay of examining and determine in the heating furnace electric power loop 23, cut off the power supply of calibrating heating furnace;
The temperature that described host computer 4 detects standard couple 10 is during greater than threshold value, and control single chip computer circuit 21 sends the relay 23 of cut-off signals in the calibrating heating furnace electric power loop, cuts off the power supply of calibrating heating furnace.
Described host computer can use PC, to increase processing power; Described relay adopts solid-state relay; Described multi-channel data acquisition device adopts Keithley2700, and framework acquisition channel number sends corresponding control command words by host computer flexibly, program control realization data acquisition, data filtering, selectively controls function such as acquisition channel.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. thermocouple verification system, it is characterized in that: described thermocouple verification system is used to connect one or more calibrating heating furnaces and carries out thermocouple calibration, comprises host computer, multi-channel data acquisition device and at least one temperature-adjusting circuit; Built-in temperature controlling thermopair, standard couple and tested thermopair when described calibrating heating furnace is worked; Each temperature-adjusting circuit is electrically connected with temperature-control heat couple state output end in the calibrating heating furnace respectively, and described temperature-adjusting circuit is monitored in real time to temperature-control heat couple, according to the status data of temperature-control heat couple, the temperature of this calibrating heating furnace is controlled in real time; The tested thermopair that described multi-channel data acquisition device is interior with examining and determine heating furnace and the state output end of standard couple are electrically connected; Described multi-channel data acquisition device is gathered the status data of tested thermopair and standard couple and is outputed to host computer, and described host computer is finished the calibrating to tested thermopair by the status data of tested thermopair and standard couple is handled;
Described temperature-adjusting circuit comprises preposing signal process circuit and control circuit, and described preposing signal process circuit is gathered the status signal of temperature-control heat couple, after amplification, filtering and A/D conversion, outputs to control circuit;
Described preposing signal process circuit comprises first amplifying circuit, filtering circuit, ambient-temperature compensation Acquisition Circuit, second amplifying circuit, multi-channel electronic switch and A/D change-over circuit; Described first amplifying circuit receives the status signal of temperature-control heat couple and amplifies, and after filtering circuit filtering, outputs to the A/D change-over circuit by multi-channel electronic switch again; Described ambient-temperature compensation Acquisition Circuit is gathered the signal of room temperature, after second amplifying circuit amplifies, outputs to the A/D change-over circuit by multi-channel electronic switch.
2. thermocouple verification system according to claim 1, it is characterized in that: described preposing signal process circuit also comprises first voltage follower and second voltage follower, described first voltage follower is arranged between filtering circuit and the multi-channel electronic switch, and described second voltage follower is arranged between second amplifying circuit and the multi-channel electronic switch.
3. thermocouple verification system according to claim 2, it is characterized in that: described control circuit comprises single chip circuit and calibrating Heating Furnace Control circuit, described single chip circuit receives the temperature-control heat couple of A/D change-over circuit output and the status data of room temperature, according to default proving temperature, the heating-up temperature of calibrating heating furnace is controlled by calibrating Heating Furnace Control circuit.
4. thermocouple verification system according to claim 3, it is characterized in that: be provided with a relay in the electric power loop of calibrating heating furnace, calibrating Heating Furnace Control circuit is the frequency range modulation circuit, described single chip circuit output is to the control signal of calibrating heating furnace, after the frequency range modulating circuit modulates, output to the relay of the electric power loop of calibrating heating furnace.
5. according to claim 3 or 4 described thermocouple verification systems, it is characterized in that: be provided with a relay in the electric power loop of calibrating heating furnace, the temperature that described single chip circuit detects temperature-control heat couple is during greater than threshold value, send cut-off signals to the relay of examining and determine in the heating furnace electric power loop, cut off the power supply of calibrating heating furnace.
6. according to the thermocouple verification system described in the claim 5; it is characterized in that: also comprise an overvoltage crowbar in the described treatment circuit; described overvoltage crowbar compares the temperature data of temperature-control heat couple and the ultimate temperature value of heating furnace operate as normal; if the temperature data of temperature-control heat couple is greater than the ultimate temperature value of heating furnace operate as normal; then send cut-off signals to the relay of examining and determine in the heating furnace electric power loop, cut off the power supply of calibrating heating furnace.
7. thermocouple verification system according to claim 6, it is characterized in that: described single chip circuit is connected with host computer, described upper computer detection is to the temperature of standard couple during greater than threshold value, the control single chip computer circuit sends cut-off signals to the relay of examining and determine in the heating furnace electric power loop, cuts off the power supply of calibrating heating furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102510807A CN101750171B (en) | 2009-12-29 | 2009-12-29 | Thermocouple verification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102510807A CN101750171B (en) | 2009-12-29 | 2009-12-29 | Thermocouple verification system |
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| Publication Number | Publication Date |
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| CN101750171A CN101750171A (en) | 2010-06-23 |
| CN101750171B true CN101750171B (en) | 2011-12-07 |
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| CN2009102510807A Expired - Fee Related CN101750171B (en) | 2009-12-29 | 2009-12-29 | Thermocouple verification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620862B (en) * | 2012-03-19 | 2014-02-19 | 张金木 | Temperature checker |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102564645A (en) * | 2010-12-27 | 2012-07-11 | 贵州双阳飞机制造厂 | Automatic calibrating device of thermocouple |
| CN102944735B (en) * | 2012-11-21 | 2015-06-17 | 重庆材料研究院 | Automatic test system and test method for thermoelectric forces of thermocouple wires |
| CN104199485B (en) * | 2014-08-26 | 2016-07-27 | 华中科技大学 | A kind of multi input temperature controller |
| CN104197976B (en) * | 2014-09-16 | 2017-09-26 | 珠海格力电器股份有限公司 | Automatic detection device for multi-path temperature and humidity sensors |
| CN104458060A (en) * | 2014-12-15 | 2015-03-25 | 南京化工职业技术学院 | Intelligent thermocouple calibration instrument |
| CN106370322A (en) * | 2016-11-24 | 2017-02-01 | 攀枝花学院 | Tungsten-rhenium thermocouple calibration system |
| CN108332882B (en) * | 2018-04-23 | 2024-03-08 | 山西迪思凯瑞科技有限公司 | Verification system of furnace temperature tracker |
| CN109269680A (en) * | 2018-11-16 | 2019-01-25 | 中环天仪（天津）气象仪器有限公司 | A kind of device and method for multichannel temperature calibrating |
| CN109708779A (en) * | 2018-12-12 | 2019-05-03 | 苏州长风航空电子有限公司 | A kind of high-temperature test facility of temperature sensor |
| CN109682499B (en) * | 2018-12-29 | 2023-10-31 | 泰安磐然测控科技有限公司 | Constant temperature electric measurement device for temperature measurement verification device and constant temperature control method |
| CN112629707A (en) * | 2020-11-10 | 2021-04-09 | 贵州航宇科技发展股份有限公司 | Heating furnace system precision testing method |
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2009
- 2009-12-29 CN CN2009102510807A patent/CN101750171B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620862B (en) * | 2012-03-19 | 2014-02-19 | 张金木 | Temperature checker |
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| CN101750171A (en) | 2010-06-23 |
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