CN102175348B - Calibrating device and calibrating method thereof capable of providing air medium temperature source - Google Patents
Calibrating device and calibrating method thereof capable of providing air medium temperature source Download PDFInfo
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- CN102175348B CN102175348B CN201110042033A CN201110042033A CN102175348B CN 102175348 B CN102175348 B CN 102175348B CN 201110042033 A CN201110042033 A CN 201110042033A CN 201110042033 A CN201110042033 A CN 201110042033A CN 102175348 B CN102175348 B CN 102175348B
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- 238000000034 method Methods 0.000 title claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 239000012774 insulation material Substances 0.000 claims abstract description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 19
- 229910052697 platinum Inorganic materials 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 28
- 238000001816 cooling Methods 0.000 description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 241000935974 Paralichthys dentatus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009529 body temperature measurement Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a calibrating device and a calibrating method thereof capable of providing an air medium temperature source, which are used for calibrating a temperature sensor. The calibrating device comprises an air source, a liquid constant temperature source and an air medium temperature source assembly built in the liquid constant temperature source, wherein the air medium temperature source assembly comprises a testing cavity, a heat exchange tube communicated with the testing cavity, a bracket, a heat shield, an upper cover board and a cotton plug of a temperature testing cavity, an external wall of the testing cavity is provided with a fixed plate fixedly connected with the bracket and distributed along a circumferential direction, and the heat shield is fixedly connected to a top surface of the fixed plate in a manner of sealed connection so as to surround the testing cavity; and an inner cavity formed by the heat shield and the testing cavity is full of thermal insulation material, and the upper cover board seals the thermal insulation material in the inner cavity. The calibrating device provided by the invention can obtain the steady and uniform air medium temperature source relative to the liquid constant temperature source.
Description
Technical field
The present invention relates to a kind of calibrating installation that temperature sensor is calibrated of being used for, characteristic provides air dielectric temperature source calibrating installation and calibration steps thereof.
Background technology
The different temperature sensor has different requirement to calibration steps, and for example, the air dielectric temperature sensor is only applicable to the temperature survey of air, employing be the contactless temperature-measuring mode, it is not suitable for the temperature survey of others such as liquid etc.; And temperature sensor in most of the cases is to lump together use with other sensor groups; The Temperature Humidity Sensor that is applied to the environmental parameter measurement is wherein typically a kind of; The measuring object that it has determined temperature by the character and the measuring object of humidity-sensitive element; The temperature survey of these Temperature Humidity Sensors is owing to only be applicable to the Measurement of Air temperature, so can only use the temperature source of air dielectric during calibration; For the air temperature sensor of special use, its structure is special, cleans easily behind the pickup and damages, and therefore, does not hope to place the liquid constant temperature medium to calibrate; In addition,, as be used in and carry out thermometric temperature sensor in the special liquid,, when calibration, also do not hope to place the liquid constant temperature medium to calibrate for guaranteeing fluid to be measured not by other material pickup for some temperature sensor.This shows that these sensors are because structural reason; The reason of temperature sensing material is not easy the reason of cleaning behind the pickup, the reason of damaging easily during cleaning; Or place behind the liquid medium can damage etc. reason, need in the constant temperature calibration source of making thermostatic medium with air, calibrate.
The existing calibrating installation of air dielectric temperature source that provides mainly contains environmental test equipment and the used humiture generator of Hygrothermograph calibration.Main temperature (humidity) testing equipment in this environmental test equipment is exactly in fact to be the constant temperature calibration source of medium with the air, and just the homogeneity (temperature difference) in its temperature field is difficult to the level that reaches higher.With the air is the testing equipment of medium, adopt and air is directly heated, cools off through electrothermal tube, cooling tube, and the control method of forced-air circulation.Because the heat conductivility of air dielectric is relatively poor, therefore, cause the stability, uniformity in temperature field all to be difficult to the level that reaches higher.In addition, can know according to the principle of experimental facilities that the heat conductivility of air just causes the stability, uniformity in temperature field all to be difficult to one of reason that reaches higher level, this wherein also has reasons such as type of heating, the type of cooling and air circulation mode.The control mode of equipment electrothermal tube heating is that discontinuous heats, and the control mode of cooling tube refrigeration is continuous cooling.When equipment moved below room temperature+30 ℃, electrothermal tube and cooling tube were worked simultaneously and are obtained equilibrium temperature; Being higher than this temperature then only needs electrothermal tube work, obtains equilibrium temperature through conduction time and the frequency of controlling electrothermal tube.Because the cold and heat source of equipment is difficult to keep higher stability, therefore, the air in the equipment also just is difficult to obtain high stability and homogeneity.
For the used humiture generator of Hygrothermograph calibration, also be to be the calibration cell of medium with the air.The temperature homogeneity of this calibration cell is higher than environmental test equipment; Its main cause is that the test chamber of humiture generator is immersed in the Liquid Medium Constant Temperature Oven fully; But the temperature range that is this humiture generator is very limited, and best temperature range has only-10 ℃～70 ℃ at present.
Summary of the invention
An object of the present invention is to provide a kind of calibrating installation stable and uniform air dielectric temperature source that can obtain at least.
The technical scheme that the present invention adopts is: a kind of calibrating installation that the air dielectric temperature source is provided; Comprise source of the gas, liquid constant temperature source, air dielectric temperature source assembly and temperature monitor; Said air dielectric temperature source assembly directly is placed in the liquid constant temperature source; Said air dielectric temperature source assembly comprises test chamber and the heat-exchange tube that is communicated with test chamber, and said source of the gas and heat-exchange tube are tightly connected;
Said air dielectric temperature source assembly also comprises support; Heat shield, upper cover plate and when calibration, be used to seal the thermometric chamber tampon of said test chamber opening; The outer wall of said test chamber has one along the fixed head on the support that is fixed on that circumferentially distributes; Said heat shield is connected on the end face of fixed head with the mode that is tightly connected, and makes it surround said test chamber; Fill up insulation material in the inner chamber that forms between said heat shield and test chamber, said upper cover plate is sealed in said insulation material in the said inner chamber.
Preferably, said heat-exchange tube is wrapped on the said support.
Preferably, the length of said heat-exchange tube is more than or equal to 150m.
Preferably, said support is the support of hollow out, and said test chamber places support, and said heat-exchange tube is wound on the outer wall of support, makes said heat-exchange tube surround said test chamber; Said test chamber carries out heat interchange through the hollow-out parts and the liquid constant temperature source of support.
Preferably; Have the socket that is used for difference plug-in mounting one-level platinum sensor and sensor to be calibrated on the bottom surface of said thermometric chamber tampon, the one-level platinum sensor of said temperature monitor and sensor to be calibrated place airtight test chamber through the mode that is inserted in the socket separately.
Preferably, the bottom in said thermometric chamber is provided with one makes the gas in the heat-exchange tube evenly diffuse to the even filter screen of gas in the thermometric chamber, and said heat-exchange tube is communicated with the thermometric chamber through the even filter screen of gas.
Preferably, said heat-exchange tube is selected the thin-walled copper tube for use, the container that said test chamber selects for use the thick copper plate of 2mm to process.
Preferably, the flow of the gas of said source of the gas output is 9 ± 10%L/min.
Preferably, for the calibration of the high temperature more than 70 ℃, it is 40 ℃～300 ℃ that temperature range is adopted in said liquid constant temperature source, and stability is ± 0.001 ℃～± 0.005 ℃, and homogeneity is ± 0.002 ℃～± 0.012 ℃ a liquid medium; For the calibration of the low temperature below 75 ℃, it is-80 ℃～110 ℃ that temperature range is adopted in said liquid constant temperature source, and stability is ± 0.0015 ℃～± 0.003 ℃, and homogeneity is ± 0.003 ℃～± 0.007 ℃ a liquid medium.
Another object of the present invention provides a kind of calibration steps that is fit to above-mentioned air dielectric temperature sensor calibration source.
The technical scheme that the present invention adopts is: provide the calibration steps of the calibrating installation of air dielectric temperature source to be: at first, make the liquid level in liquid constant temperature source be higher than said heat shield from 1/4th initial height of fixed head; Then, the one-level platinum sensor with sensor to be calibrated and temperature monitor is placed in the test chamber of good seal simultaneously; At last, the temperature of controlling liquid constant temperature source remains on the design temperature, when the temperature in the test chamber reaches design temperature, makes air dielectric gas stream that source of the gas provides through heat-exchange tube and test chamber; When the temperature in the test chamber reaches design temperature and when stable, reading of data is accomplished calibration operation once more.
Beneficial effect of the present invention is: on the one hand; Adopt test chamber, heat-exchange tube, the support of comprising of the present invention; The air dielectric temperature source assembly of the structure of heat shield, upper cover plate and thermometric chamber tampon; Cooperate the liquid constant temperature source, can obtain stable, the uniform air dielectric temperature source in relative liquid constant temperature source; On the other hand, through selecting for use suitable liquid constant temperature source can obtain the wide-range temperature source.
Description of drawings
Fig. 1 is the structural representation that the calibrating installation of air dielectric temperature source is provided according to the invention;
Fig. 2 is the structural representation of air dielectric temperature source assembly shown in Figure 1.
Embodiment
As shown in Figure 1; Air dielectric temperature sensor calibration source according to the invention comprises source of the gas 1, liquid constant temperature source 2, air dielectric temperature source assembly 3 and temperature monitor 4, and this air dielectric temperature source assembly 3 directly is placed in the liquid constant temperature source 2, and it comprises test chamber 32 and the heat-exchange tube 31 that is communicated with test chamber 32; This source of the gas 1 is tightly connected with heat-exchange tube 31; Be preferably through silica gel hose and connect, like this, rely on the self sealss property of silica gel hose can realize tight connection.This temperature monitor 4 is selected the temperature in the one-level platinum sensor collecting test chamber 32 usually for use, the sensor acquisition to be calibrated that places test chamber 32 to the temperature that collects of temperature and the one-level platinum sensor data acquisition unit (is the data acquisition unit of hp34970 like model) that all is sent to temperature monitor 4 show, handle and monitor.
As shown in Figure 2; This temperature source assembly 3 also comprises the support 34 of hollow out; Heat shield 36, upper cover plate 37 and thermometric chamber tampon 38; The outer wall of this test chamber 32 has one along the fixed head 39 that circumferentially distributes, and this heat shield 36 is connected on the end face of fixed head 39 with the mode that is tightly connected, and makes it surround this test chamber; Insulation material 35 is filled up in the inner chamber of this heat shield 36 and 32 formation of test chamber; And with upper cover plate 37 with this insulation material 35, be preferably glass fibre cotton, hermetically enclosed in this inner chamber; Promptly this upper cover plate 37 and heat shield are 36, and and the outer wall of test chamber 32 between all be tightly connected; This thermometric chamber tampon 38 is used for when calibration, sealing the opening of this test chamber 32.For the ease of operation; Has the socket that is used for difference plug-in mounting one-level platinum sensor and sensor to be calibrated on the bottom surface of this thermometric chamber tampon 38; Like this; In when calibration, only need one-level platinum sensor and sensor to be calibrated are inserted in the socket separately, and then thermometric chamber tampon 38 filled in the test chamber 32 get final product.At this, a plurality of sensors to be calibrated of plug-in mounting simultaneously on this thermometric chamber tampon 38 can carry out the calibration of a plurality of sensors to be calibrated simultaneously.This fixed head 39 can be connected on the support 34 of hollow out through screw; Make test chamber 32 place support 34; The heat-exchange tube 31 of drawing from test chamber 32 can be wrapped on the support 34; And draw the end that need be communicated with source of the gas 1, heat interchange can be carried out through the openwork part of support 34 and the gas in the test chamber 32 in this liquid constant temperature source 2.
In addition, this upper cover plate 37 can be bonded on the edge of heat shield 36 through high-temp glue, and with the joint between the outer wall in airtight upper cover plate 37 of high-temp glue and thermometric chamber 32.The joint that this heat shield 36 and fixed head are 39 also can seal through high-temp glue, and this heat shield 36 can be connected on the fixed head 39 through riveted way.
In order to make the gas in the heat-exchange tube 31 can diffuse in the thermometric chamber 32 more equably; The even filter screen 33 of one gas can be set in the bottom in thermometric chamber 32; This heat-exchange tube 31 is communicated with thermometric chamber 32 through the even filter screen 33 of gas; Can treat the gas that gets in the thermometric chamber 32 through the even filter screen 33 of this gas and shunt diffusion, make it evenly fill whole thermometric chamber 32, to guarantee thermometric accuracy.At this, the mode that the even filter screen 33 of this gas can freeze is fixed on the thermometric chamber 32, and in addition, the mode that this heat-exchange tube 31 can not have seam welding is fixed on the even filter screen 33 of gas.
In order to reach good heat exchange effect, this heat-exchange tube 31 is preferably selects for use thin-walled copper tube, test chamber 32 to be preferably the container of selecting for use the thick copper plate of 2mm to process.
This source of the gas 1 can adopt pressurized air or nitrogen, and these two kinds of gases are all than being easier to acquisition and with low cost.It should be noted that moisture that when low temperature (below 0 ℃) will be avoided containing in the air freezes in heat-exchange tube 31 stops up heat-exchange tube, must use dried compressed air or pure nitrogen gas as source of the gas 1; Use pressurized air to get final product in the time of more than 0 ℃; The flow of gas remains on 9L/min the best; Certainly have ± 10% deviation; Can make heat-exchange tube 31 and gas and liquid constant temperature source 2 in the test chamber 32 carry out sufficient heat interchange like this, uniform and stable with the temperature of guaranteeing test chamber, and with the temperature maintenance basically identical in liquid constant temperature source 2.At this, increase the length of heat-exchange tube 31, more help in test chamber 32, obtaining uniform and stable air dielectric calibration source, as adopting more than or equal to the heat-exchange tube more than the 150m 31, the length of heat-exchange tube 31 in the present embodiment is 160m.
Aspect liquid constant temperature source 2; Low temperature 7080 types and the high temperature 6022 type Liquid Medium Constant Temperature Ovens of the Hart brand liquid medium of fluke have been selected in the present embodiment for use; Its temperature control effect obviously improves than environmental test equipment and the used humiture generator of Hygrothermograph calibration, and temperature measurement range has also obtained obvious expansion.Be specially high temperature (more than 70 ℃) and select 6022 types, 40 ℃～300 ℃ of temperature ranges, stability ± 0.001 ℃～± 0.005 ℃, homogeneity ± 0.002 ℃～± 0.012 ℃; Low temperature (below 75 ℃) is selected 7080 types, temperature range-80 ℃～110 ℃, stability ± 0.0015 ℃～± 0.003 ℃, homogeneity ± 0.003 ℃～± 0.007 ℃.Adopt this kind liquid constant temperature source can obtain stable, the uniform air dielectric temperature source of wide region.
Gas stream is flowed under the situation in thermometric chamber 32 behind sufficient length and the heat-exchange tube 31 of casual bubble in liquid constant temperature source 2; The temperature that helps making thermometric chamber 32 promptly is consistent with the temperature effect in liquid constant temperature source 2 basically; Test result has also confirmed this point, asks for an interview table 1.
During calibration, the liquid level in liquid constant temperature source 2 must be higher than 1/4th height of counting from fixed head 39 of heat shield shown in Figure 2 36, to guarantee the consistance of test chamber 32 internal and external temperatures.After air dielectric temperature sensor calibration source is installed; The one-level platinum sensor of sensor to be calibrated and temperature monitor 4 is placed in the test chamber 32 of good seal simultaneously; Configure the temperature in liquid constant temperature source 2;, the temperature in the test chamber 32 make air dielectric gas stream that source of the gas 1 provides through heat-exchange tube 31 and test chamber 32 when reaching design temperature again, when temperature in the test chamber 32 reaches design temperature and when stable once more, i.e. and readable data; Carry out the data judgment processing at last, accomplish calibration operation.
Table 1: air dielectric temperature sensor calibration source is in the test result of each temperature spot
| Temperature spot (℃) | The temperature difference (℃) | The fluctuation degree (℃) |
| -70 | 0.001～0.004 | ±0.003 |
| -40 | 0.001～0.005 | ±0.003 |
| 0 | 0.001～0.006 | ±0.004 |
| 25 | 0.001～0.005 | ±0.003 |
| 50 | 0.001～0.004 | ±0.003 |
| 75 (in cryostat,s) | 0.001～0.006 | ±0.004 |
| 70 (in the high temperature grooves) | 0.001 | ±0.003 |
| 100 | 0.001～0.004 | ±0.004 |
| 150 | 0.001～0.006 | ±0.003 |
| 180 | 0.001～0.005 | ±0.005 |
Claims (11)
1. calibrating installation that the air dielectric temperature source is provided; Comprise source of the gas, liquid constant temperature source, air dielectric temperature source assembly and temperature monitor; Said air dielectric temperature source assembly directly is placed in the liquid constant temperature source; It is characterized in that: said air dielectric temperature source assembly comprises test chamber and the heat-exchange tube that is communicated with test chamber, and said source of the gas and heat-exchange tube are tightly connected;
Said air dielectric temperature source assembly also comprises support; Heat shield, upper cover plate and when calibration, being used to seals the thermometric chamber tampon of the opening of said test chamber; The outer wall of said test chamber has one along the fixed head on the support that is fixed on that circumferentially distributes; Said heat shield is connected on the end face of fixed head with the mode that is tightly connected, and makes it surround said test chamber; Fill up insulation material in the inner chamber that forms between said heat shield and test chamber, said upper cover plate is sealed in said insulation material in the said inner chamber.
2. calibrating installation according to claim 1 is characterized in that: said heat-exchange tube is wrapped on the said support.
3. calibrating installation according to claim 2 is characterized in that: the length of said heat-exchange tube is more than or equal to 150m.
4. calibrating installation according to claim 2 is characterized in that: said support is the support of hollow out, and said test chamber places support, and said heat-exchange tube is wound on the outer wall of support, makes said heat-exchange tube surround said test chamber; Said test chamber carries out heat interchange through the hollow-out parts and the liquid constant temperature source of support.
5. calibrating installation according to claim 1; It is characterized in that: have the socket that is used for difference plug-in mounting one-level platinum sensor and sensor to be calibrated on the bottom surface of said thermometric chamber tampon, the one-level platinum sensor of said temperature monitor and sensor to be calibrated place airtight test chamber through the mode that is inserted in the socket separately.
6. calibrating installation according to claim 1 is characterized in that: the bottom of said test chamber is provided with one makes the gas in the heat-exchange tube evenly diffuse to the even filter screen of gas in the test chamber, and said heat-exchange tube is communicated with test chamber through the even filter screen of gas.
7. calibrating installation according to claim 1 is characterized in that: said heat-exchange tube is selected the thin-walled copper tube for use, the container that said test chamber selects for use the thick copper plate of 2mm to process.
8. calibrating installation according to claim 1 is characterized in that: the flow of the gas of said source of the gas output is 9 ± 10%L/min.
9. calibrating installation according to claim 1; It is characterized in that: calibrate for the high temperature more than 70 ℃; It is 40 ℃～300 ℃ that temperature range is adopted in said liquid constant temperature source, and stability is ± 0.001 ℃～± 0.005 ℃, and homogeneity is ± 0.002 ℃～± 0.012 ℃ a liquid medium.
10. calibrating installation according to claim 1; It is characterized in that: calibrate for the low temperature below 75 ℃; It is-80 ℃～110 ℃ that temperature range is adopted in said liquid constant temperature source, and stability is ± 0.0015 ℃～± 0.003 ℃, and homogeneity is ± 0.003 ℃～± 0.007 ℃ a liquid medium.
11. the calibration steps according to each calibrating installation in the claim 1 to 10 is characterized in that: at first, make the liquid level in liquid constant temperature source be higher than said heat shield from 1/4th initial height of fixed head; Then, the one-level platinum sensor with sensor to be calibrated and temperature monitor is placed in the test chamber of good seal simultaneously; At last, the temperature of controlling liquid constant temperature source remains on the design temperature, when the temperature in the test chamber reaches design temperature, makes air dielectric gas stream that source of the gas provides through heat-exchange tube and test chamber; When the temperature in the test chamber reaches design temperature and when stable, reading of data is accomplished calibration operation once more.
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| CN103115699B (en) * | 2013-02-06 | 2014-09-10 | 北京东方计量测试研究所 | Temperature equalizing system for calibration of temperature sensors in vacuum |
| CN104132686B (en) * | 2014-08-04 | 2017-04-19 | 广州赛宝计量检测中心服务有限公司 | Thermostatic temperature and humidity calibration box heated through liquid |
| CN104133186B (en) * | 2014-08-04 | 2017-04-19 | 广州赛宝计量检测中心服务有限公司 | Air thermostatic box for verification or calibration of air type standard resistor |
| CN104316221B (en) * | 2014-11-14 | 2017-04-12 | 陕西电器研究所 | Calibration device for contact type high temperature sensor |
| CN104375073A (en) * | 2014-11-18 | 2015-02-25 | 中国人民解放军63655部队 | Photoelectric response sensitivity calibrating device for optical waveguide detector under different temperatures |
| CN104374494A (en) * | 2014-11-18 | 2015-02-25 | 中国人民解放军63655部队 | Packaging structure for thermistor temperature coefficient calibration |
| CN112146788A (en) * | 2020-09-28 | 2020-12-29 | 广东韶钢松山股份有限公司 | Thermal resistance verification system and method |
| CN113551795B (en) * | 2021-07-20 | 2022-08-09 | 中国计量科学研究院 | Temperature filtering device for standard resistor thermostatic bath |
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|---|---|---|---|---|
| US5707147A (en) * | 1996-07-03 | 1998-01-13 | The United States Of America As Represented By The Secretary Of The Air Force | Hot gas flow thermocouple test system |
| CN101354294A (en) * | 2008-09-08 | 2009-01-28 | 王长勋 | Cylinder-shaped air medium high temperature constant temperature bath |
| CN201327427Y (en) * | 2008-12-24 | 2009-10-14 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Temperature and humidity measurement calibrating device |
| CN202041324U (en) * | 2011-02-22 | 2011-11-16 | 广州赛宝计量检测中心服务有限公司 | Calibrating device for providing air medium temperature source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4714849B2 (en) * | 2006-03-02 | 2011-06-29 | 独立行政法人産業技術総合研究所 | Variable temperature low temperature calibration system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5707147A (en) * | 1996-07-03 | 1998-01-13 | The United States Of America As Represented By The Secretary Of The Air Force | Hot gas flow thermocouple test system |
| CN101354294A (en) * | 2008-09-08 | 2009-01-28 | 王长勋 | Cylinder-shaped air medium high temperature constant temperature bath |
| CN201327427Y (en) * | 2008-12-24 | 2009-10-14 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Temperature and humidity measurement calibrating device |
| CN202041324U (en) * | 2011-02-22 | 2011-11-16 | 广州赛宝计量检测中心服务有限公司 | Calibrating device for providing air medium temperature source |
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