CN103743434B - Electric-hot-plate calibration method - Google Patents
Electric-hot-plate calibration method Download PDFInfo
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- CN103743434B CN103743434B CN201310711953.4A CN201310711953A CN103743434B CN 103743434 B CN103743434 B CN 103743434B CN 201310711953 A CN201310711953 A CN 201310711953A CN 103743434 B CN103743434 B CN 103743434B
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Abstract
The present invention relates to the technical field of electric hot plate, more specifically, relate to Electric-hot-plate calibration method.Electric-hot-plate calibration method, wherein, comprises the following steps: S1. visual examination: carry out presentation quality inspection to electric hot plate; S2. electrical security inspection: measure the insulation resistance between electric hot plate attaching plug phase line and earth terminal with insulation resistance meter; S3. temperature correction; S31. selective temperature calibration point: S32. arranges the position of test point; S33. the quantity of test point is arranged; S34. laying temperature sensor; S35. temperature error calculates, temperature stability calculates, temperature uniformity calculates; S4. calibration result is exported.The research success of Electric-hot-plate calibration method of the present invention, provides calibration steps that is unified, specification to electric hot plate measurement and calibration, solves electric hot plate measurement and calibration technical barrier.Strict evaluation has been carried out to the uncertainty of parameter in electric hot plate calibration, and effectively the tracing to the source of standard, improve the accuracy of measurement and calibration, meet the technical requirement of client.
Description
Technical field
The present invention relates to the technical field of electric hot plate, more specifically, relate to Electric-hot-plate calibration method.
Background technology
Electric hot plate is modal a kind of firing equipment in electric heater, there is homogeneous heating, quick heating, long service life, easy and simple to handle, the features such as use safety, being widely used in the oven dry of sample, drying and other humid tests, is the indispensable instrument of biology, heredity, medical and health, environmental protection, Biochemical Lab, analysis room, education and scientific research.
Electric hot plate is modal one in electric heater, and its principle of work is exactly basic thermoelectric effect, convert electrical energy into heat energy, and conduction works after utilizing inner lectrothermal alloy wire to be energized to outer field housing.Common electric hot plate has cast aluminium electrothemic plate, stainless steel electric hot plate, ceramic electric heating plate and silica-gel electrothermic plate etc.
Electric hot plate can be divided into thermostatic electrothermal plate and the large class of high-temperature electric heating plate two.It can be high-temperature electric heating plate that power reaches more than 1800W; Lower than 1800W is thermostatic electrothermal plate.Thermostatic electrothermal plate is generally used for laboratory, and it is higher to stability requirement, can not or high or low, this can have influence on the data of test.High-temperature electric heating plate is generally used for machinery industry, needs high temperature normally will reach more than 2000 DEG C during its work.
At present, Electric-hot-plate calibration method or blank, being aligned in of electric hot plate is domestic extremely lack of standardization, and not having can the national verification code of reference or calibrating standard, does not also form unified calibration steps, does not more have akin technical scheme.Also the calibration operation of many electric hot plates is had in recent years, but because there is no the method for energy foundation, calibration is inadequate unified standard also, more well can not trace to the source, bring very large uncertainty to the calibration operation of electric hot plate, can not customer requirement be met, therefore be necessary the research carrying out Electric-hot-plate calibration method, find rationally effective calibration steps, the calibration of specification electric hot plate, makes it to be traceable to country and international standard.
Summary of the invention
The present invention, for overcoming at least one defect described in above-mentioned prior art, provides Electric-hot-plate calibration method, and its method step is simple, improves the accuracy of measurement and calibration, can apply widely.
First, Electric-hot-plate calibration method mainly comprises following test data:
Temperature error: electric hot plate at steady state, the difference of the mean value of displays temperature and work valid interval central point observed temperature mean value.
Temperature stability: electric hot plate at steady state, in predetermined time interval, measure over time by work space central point temperature.
Temperature uniformity: at steady state, work valid interval is at certain maximum difference in a flash between former meaning 2 temperature for electric hot plate.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Electric-hot-plate calibration method, wherein, comprises the following steps:
S1. visual examination: presentation quality inspection is carried out to electric hot plate;
Electric hot plate should have nameplate, on nameplate must designated model, manufacturing plant, production code member and production days etc. information.On control panel, designated symbol should be clear eye-catching, and electrical equipment control button is complete, flexible, reliable.During use, electric hot plate should be placed steadily, answers the heat-barrier materials such as liner porcelain plate or sheet asbestos under footing.The necessary reliable ground of shell, and guard against damp, first should clear up hot face before using, surrounding environment cleans, and avoids direct sunlight.
S2. electrical security inspection: measure the insulation resistance between electric hot plate attaching plug phase line and earth terminal with insulation resistance meter;
The electrical equipment of electric hot plate should be safe and reliable, must not have the phenomenons such as electric leakage, and the insulation resistance between power unit and casing is not less than 2M Ω.
S3. temperature correction;
S31. selective temperature calibration point:
S32. the position of test point is arranged;
S33. the quantity of test point is arranged;
S34. laying temperature sensor in test point, is set to required nominal temperature by the temperature controller of electric hot plate, and equipment is normally worked; Start reading after the work of equipment normal table, the temperature of fetch equipment display, the temperature that per interval k records all test points once and the temperature of recording unit display, until complete the time f of test, records n time altogether;
S35. temperature error calculates:
△t
d=t
d-t
o
In formula: △ t
d---the error of temperature, DEG C;
T
o---the mean value that central point is measured for n time, DEG C;
T
d---the mean value of equipment displays temperature, DEG C;
Temperature stability calculates:
Electric hot plate at steady state, measure over time by work space central point temperature, and namely central point is in the time f completing test, and the half of the difference of actual measurement maximum temperature and minimum temperature, titled with " ± " number;
△t
f=±（t
omax-t
omin）/2
In formula: △ t
f---temperature stability, DEG C;
T
omax---the maximum temperature in central point n measurement, DEG C;
T
omin---the minimum temperature in central point n measurement, DEG C;
Temperature uniformity calculates:
Electric hot plate at steady state, surveys the arithmetic mean of the difference of maximum temperature and minimum temperature in the time f completing test in each test;
△t
u=
In formula: △ t
u---temperature uniformity, DEG C;
N---pendulous frequency;
T
imax---the maximum temperature that each calibration point records at i-th time, DEG C;
T
imin---the minimum temperature that each calibration point records at i-th time, DEG C;
S4. calibration result is exported;
In this programme, this method is applicable to the calibration of temperature lower than the serial electric heating appliance product such as electric heater, Electrothermal ring, electric boiling plate, electric heating tube of 650 DEG C.
And test will be carried out under the following conditions:
Temperature: (15 ~ 35) DEG C, humidity: (30 ~ 85) %RH, air pressure: (86 ~ 106) kPa, the power supply of instrument: change in voltage be no more than ratings ± 1%, other condition: should exist without judder and corrosive gas around electric hot plate, room air, without obvious flowing, should avoid other cold and heat sources to affect.
Temperature survey is by thermoelectricity occasionally other temperature measurement systems facilitating the temperature sensor for attaching and secondary instrument to form, and measurement range is (0 ~ 650) DEG C, the limits of error ± 0.5 DEG C.Insulation measurement insulation resistance meter (output voltage: 500VDC) accuracy: 10 grades.
In this programme, in step S31, the calibration of electric plate temperature generally answers 10%, 50%, 90% of choice for use scope, also can need to select actual conventional temperature spot according to user.
Wherein, in step S34, desirable k is 2min, f be 30min, n is 15 times, and in described step S33, test point is 5, is evenly distributed on face, effective perform region, is located at point centered by center, face, effective perform region.
First in 5 test points, place 5 temperature sensors, the temperature controller of electric hot plate is set to required nominal temperature, equipment is normally worked; Start reading after the work of equipment normal table, the temperature of fetch equipment display, the temperature that per interval 2min records all test points once and the temperature of recording unit display, records 15 times, altogether until complete the time 30min of test.
The temperature of central point is averaged, obtains t
o, the temperature of equipment display is averaged, obtains t
d, then according to formula △ t
d=t
d-t
oobtain temperature error.
Maximum temperature t is taken out during central point is measured at 15 times
omax, during central point is measured at 15 times, take out minimum temperature t
omin, then according to formula △ t
f=± (t
omax-t
omintemperature stability is obtained in)/2.
In 30min, in (every 2min test once) each test, survey the arithmetic mean of the difference of maximum temperature and minimum temperature, obtain temperature uniformity according to formula.
Further, in described step S32, on the location arrangements of the test point workplace in the effective perform region of instrument, the distance in test point and instrument sideline is not less than 1/10 of the length of side.Each temperature sensor can be made like this to work independently, and all can measure effective test point temperature.
Further, in described step S4, calibration certificate provided by the instrument and equipment through calibration, and displays temperature error, temperature stability, temperature uniformity on calibration certificate, can also provide calibration result uncertainty.
Further, after described step S4, can to resume classes standard to electric hot plate, accurate interval of resuming classes is no more than 1 year.
In this programme, temperature error: the temperature error of electric hot plate is not more than ± 5 DEG C, temperature stability: the temperature stability of electric hot plate is not more than ± and 2 DEG C, temperature uniformity: the temperature uniformity of electric hot plate is not more than 5 DEG C.If exceed above scope, can determine that electric hot plate is underproof product.
Compared with prior art, beneficial effect is: the research success of Electric-hot-plate calibration method of the present invention, provides calibration steps that is unified, specification, solve electric hot plate measurement and calibration technical barrier to electric hot plate measurement and calibration.Strict evaluation has been carried out to the uncertainty of parameter in electric hot plate calibration, and effectively the tracing to the source of standard, improve the accuracy of measurement and calibration, meet the technical requirement of client.
Accompanying drawing explanation
Fig. 1 is method flow schematic diagram of the present invention.
Fig. 2 is that temperature test of the present invention point arranges schematic diagram.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.Describe position relationship in accompanying drawing only for exemplary illustration, the restriction to this patent can not be interpreted as.
As shown in Figure 1, 2, Electric-hot-plate calibration method, wherein, comprises the following steps:
S1. visual examination: presentation quality inspection is carried out to electric hot plate;
Electric hot plate should have nameplate, on nameplate must designated model, manufacturing plant, production code member and production days etc. information.On control panel, designated symbol should be clear eye-catching, and electrical equipment control button is complete, flexible, reliable.During use, electric hot plate should be placed steadily, answers the heat-barrier materials such as liner porcelain plate or sheet asbestos under footing.The necessary reliable ground of shell, and guard against damp, first should clear up hot face before using, surrounding environment cleans, and avoids direct sunlight.
S2. electrical security inspection: measure the insulation resistance between electric hot plate attaching plug phase line and earth terminal with insulation resistance meter;
The electrical equipment of electric hot plate should be safe and reliable, must not have the phenomenons such as electric leakage, and the insulation resistance between power unit and casing is not less than 2M Ω.
S3. temperature correction;
S31. selective temperature calibration point:
S32. the position of test point is arranged;
S33. the quantity of test point is arranged;
S34. laying temperature sensor in test point, is set to required nominal temperature by the temperature controller of electric hot plate, and equipment is normally worked; Start reading after the work of equipment normal table, the temperature of fetch equipment display, the temperature that per interval k records all test points once and the temperature of recording unit display, until complete the time f of test, records n time altogether;
S35. temperature error calculates:
△t
d=t
d-t
o
In formula: △ t
d---the error of temperature, DEG C;
T
o---the mean value that central point is measured for n time, DEG C;
T
d---the mean value of equipment displays temperature, DEG C;
Temperature stability calculates:
Electric hot plate at steady state, measure over time by work space central point temperature, and namely central point is in the time f completing test, and the half of the difference of actual measurement maximum temperature and minimum temperature, titled with " ± " number;
△t
f=±（t
omax-t
omin）/2
In formula: △ t
f---temperature stability, DEG C;
T
omax---the maximum temperature in central point n measurement, DEG C;
T
omin---the minimum temperature in central point n measurement, DEG C;
Temperature uniformity calculates:
Electric hot plate at steady state, surveys the arithmetic mean of the difference of maximum temperature and minimum temperature in the time f completing test in each test;
△t
u=
In formula: △ t
u---temperature uniformity, DEG C;
N---pendulous frequency;
T
imax---the maximum temperature that each calibration point records at i-th time, DEG C;
T
imin---the minimum temperature that each calibration point records at i-th time, DEG C;
S4. calibration result is exported;
In the present embodiment, this method is applicable to the calibration of temperature lower than the serial electric heating appliance product such as electric heater, Electrothermal ring, electric boiling plate, electric heating tube of 650 DEG C.
And test will be carried out under the following conditions:
Temperature: (15 ~ 35) DEG C, humidity: (30 ~ 85) %RH, air pressure: (86 ~ 106) kPa, the power supply of instrument: change in voltage be no more than ratings ± 1%, other condition: should exist without judder and corrosive gas around electric hot plate, room air, without obvious flowing, should avoid other cold and heat sources to affect.
Temperature survey is by thermoelectricity occasionally other temperature measurement systems facilitating the temperature sensor for attaching and secondary instrument to form, and measurement range is (0 ~ 650) DEG C, the limits of error ± 0.5 DEG C.Insulation measurement insulation resistance meter (output voltage: 500VDC) accuracy: 10 grades.
In the present embodiment, in step S31, the calibration of electric plate temperature generally answers 10%, 50%, 90% of choice for use scope, also can need to select actual conventional temperature spot according to user.
Wherein, in step S34, desirable k is 2min, f be 30min, n is 15 times.
As in Fig. 2, in described step S33, test point is 5, temperature test point A, B, C, D, O letter representation, and test point is generally 5 points, is evenly distributed on face, effective perform region, point centered by the O point being located at center, face, effective perform region.In addition, during actual test, also can require suitably increase or reduce calibration point according to user
First in 5 test points, place 5 temperature sensors, the temperature controller of electric hot plate is set to required nominal temperature, equipment is normally worked; Start reading after the work of equipment normal table, the temperature of fetch equipment display, the temperature that per interval 2min records all test points once and the temperature of recording unit display, records 15 times, altogether until complete the time 30min of test.
The temperature of central point O is averaged, obtains t
o, the temperature of equipment display is averaged, obtains t
d, then according to formula △ t
d=t
d-t
oobtain temperature error.
Maximum temperature t is taken out during central point O is measured at 15 times
omax, during central point O is measured at 15 times, take out minimum temperature t
omin, then according to formula △ t
f=± (t
omax-t
omintemperature stability is obtained in)/2.
In 30min, in (every 2min test once) each test, survey the arithmetic mean of the difference of maximum temperature and minimum temperature, obtain temperature uniformity according to formula.
In the present embodiment, temperature error: the temperature error of electric hot plate is not more than ± 5 DEG C, temperature stability: the temperature stability of electric hot plate is not more than ± and 2 DEG C, temperature uniformity: the temperature uniformity of electric hot plate is not more than 5 DEG C.
Further, in described step S32, on the location arrangements of the test point workplace in the effective perform region of instrument, the distance in test point and instrument sideline is not less than 1/10 of the length of side.Each temperature sensor can be made like this to work independently, and all can measure effective test point temperature.
Further, in described step S4, calibration certificate provided by the instrument and equipment through calibration, and displays temperature error, temperature stability, temperature uniformity on calibration certificate, can also provide calibration result uncertainty.
Further, after described step S4, can to resume classes standard to electric hot plate, accurate interval of resuming classes is no more than 1 year.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (5)
1. Electric-hot-plate calibration method, is characterized in that, comprises the following steps:
S1. visual examination: presentation quality inspection is carried out to electric hot plate;
S2. electrical security inspection: measure the insulation resistance between electric hot plate attaching plug phase line and earth terminal with insulation resistance meter;
S3. temperature correction;
S31. selective temperature calibration point:
S32. the position of test point is arranged;
S33. the quantity of test point is arranged;
S34. laying temperature sensor in test point, is set to required nominal temperature by the temperature controller of electric hot plate, and equipment is normally worked; Start reading after the work of equipment normal table, the temperature of fetch equipment display, the temperature that per interval k records all test points once and the temperature of recording unit display, until complete the time f of test, records n time altogether;
S35. temperature error calculates:
△t
d=t
d-t
o
In formula: △ t
d---the error of temperature, DEG C;
T
o---the mean value that central point is measured for n time, DEG C;
T
d---the mean value of equipment displays temperature, DEG C;
Temperature stability calculates:
Electric hot plate at steady state, measure over time by work space central point temperature, and namely central point is in the time f completing test, and the half of the difference of actual measurement maximum temperature and minimum temperature, titled with " ± " number;
△t
f=±（t
omax-t
omin）/2
In formula: △ t
f---temperature stability, DEG C;
T
omax---the maximum temperature in central point n measurement, DEG C;
T
omin---the minimum temperature in central point n measurement, DEG C;
Temperature uniformity calculates:
Electric hot plate at steady state, surveys the arithmetic mean of the difference of maximum temperature and minimum temperature in the time f completing test in each test;
△t
u=
In formula: △ t
u---temperature uniformity, DEG C;
N---pendulous frequency;
T
imax---the maximum temperature that each calibration point records at i-th time, DEG C;
T
imin---the minimum temperature that each calibration point records at i-th time, DEG C;
S4. calibration result is exported.
2. Electric-hot-plate calibration method according to claim 1, is characterized in that: in described step S32, and on the location arrangements of the test point workplace in the effective perform region of instrument, the distance in test point and instrument sideline is not less than 1/10 of the length of side.
3. Electric-hot-plate calibration method according to claim 1, is characterized in that: in described step S33, and test point is 5, is evenly distributed on face, effective perform region.
4. Electric-hot-plate calibration method according to claim 1, is characterized in that: in described step S4, and the instrument and equipment through calibration provides calibration certificate, displays temperature error, temperature stability, temperature uniformity on calibration certificate.
5. according to the arbitrary described Electric-hot-plate calibration method of Claims 1-4, it is characterized in that: after described step S4, can to resume classes standard to electric hot plate, accurate interval of resuming classes is no more than 1 year.
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|---|---|---|---|
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|---|---|---|---|
| CN201310711953.4A CN103743434B (en) | 2013-12-20 | 2013-12-20 | Electric-hot-plate calibration method |
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| CN103743434B true CN103743434B (en) | 2016-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108764015B (en) * | 2015-10-19 | 2021-03-02 | Oppo广东移动通信有限公司 | Method and device for acquiring fingerprint image to be identified and mobile terminal |
| CN109828152B (en) * | 2019-01-28 | 2021-12-03 | 东莞市硅翔绝缘材料有限公司 | Automatic test equipment for battery heating plate |
| CN110346057A (en) * | 2019-07-15 | 2019-10-18 | 重庆市计量质量检测研究院 | A kind of temperature correction method for vacuum oven |
| DE102019125736A1 (en) * | 2019-09-25 | 2021-03-25 | Audi Ag | Calibrating a charging device of an electric vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1561020A (en) * | 1976-12-08 | 1980-02-13 | Nederlandse Gasunie Nv | Apparatus for determining the efficiency of a heating appliance |
| CN201628594U (en) * | 2010-02-09 | 2010-11-10 | 株洲南车时代电气股份有限公司 | Batch temperature detection device for digital temperature sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0285722A (en) * | 1988-09-22 | 1990-03-27 | Hitachi Ltd | System for monitoring process data |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1561020A (en) * | 1976-12-08 | 1980-02-13 | Nederlandse Gasunie Nv | Apparatus for determining the efficiency of a heating appliance |
| CN201628594U (en) * | 2010-02-09 | 2010-11-10 | 株洲南车时代电气股份有限公司 | Batch temperature detection device for digital temperature sensor |
Non-Patent Citations (2)
| Title |
|---|
| 实验用箱式电阻炉的校准;田忠山;《品牌与标准化》;20111231;第63页 * |
| 小型箱式电阻炉检测方法比较;张弓;《品牌与标准化》;20101231;第49页 * |
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Address after: 511400 150, No. 8, Qishan Road, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: Radio and TV Measurement and Testing Group Co.,Ltd. Address before: 510656 Guangdong city of Guangzhou province Whampoa Avenue Tianhe District Xiping Yun Road No. 163 Patentee before: GUANGZHOU GRG METROLOGY & TEST Co.,Ltd. |