CN105738009B - A kind of calibrating installation for temperature monitoring - Google Patents
A kind of calibrating installation for temperature monitoring Download PDFInfo
- Publication number
- CN105738009B CN105738009B CN201610074511.7A CN201610074511A CN105738009B CN 105738009 B CN105738009 B CN 105738009B CN 201610074511 A CN201610074511 A CN 201610074511A CN 105738009 B CN105738009 B CN 105738009B
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- generating pipe
- outer tube
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000009434 installation Methods 0.000 title claims abstract description 20
- 238000010992 reflux Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 206010037660 Pyrexia Diseases 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 9
- 238000012806 monitoring device Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000004209 hair Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of calibrating installations for temperature monitoring, including：It is internally provided with the temperature control of temperature control element；Heat-generating pipe for providing normal temperature for the temperature transducer of temperature monitoring, two ports of heat-generating pipe are connected to outlet and the refluxing opening of temperature control；For the warm medium of biography in temperature control to be transported to the controller in heat-generating pipe.In above-mentioned apparatus, the complete media flow loop of a closure is formed by temperature control and heat-generating pipe, temperature control element is provided in temperature control, it can be to passing control of the warm medium into trip temperature, biography temperature medium after controller can adjust the temperature in temperature control is transmitted in heat-generating pipe, biography temperature medium is set to be circulated in complete circuit, it ensure that the uniform unification of fever pipe surface temperature value everywhere or temperature change, so as to provide normal temperature environment for temperature transducer, convenient for being corrected to the temperature measurement of temperature transducer.
Description
Technical field
The present invention relates to power measurement technical fields, more specifically to a kind of calibration cartridge for temperature monitoring
It sets.
Background technology
With universal and application of the temperature on-line monitoring device of transmission line wire on transmission line wire, how school
The thermometric accuracy of quasi- transmission line wire temperature on-line monitoring device becomes a technical issues that need to address.
In transmission line wire temperature on-line monitoring device, temperature transducer internally-arranged type can be divided into according to textural classification
With temperature transducer externally positioned type.The transmission line wire temperature on-line monitoring device of temperature transducer externally positioned type can be in thermostat
Carry out thermometric accuracy calibration, and the transmission line wire temperature on-line monitoring device calibration method of temperature transducer internally-arranged type at
For problem, because the external shell and inside chip of device cannot all bear the high temperature during sensor test, and device
Complete machine is non-watertight, so the general method calibrated to device using thermostat cannot be used for calibration sensor internally-arranged type
Transmission line wire temperature on-line monitoring device.
In the prior art, so that metal bar is heated up by the way of being passed through high current to metal bar, be clipped on barred body outer diameter
Temperature detector perceives the variation of temperature by built-in temperature transducer, and spreads out of the temperature value after variation.However, this
In calibration method, the temperature change of metal bar is uneven, therefore the temperature transducer that tests out that can only be rough follows conductor temperature
Variation and change, the but thermometric accuracy performance of not energetic calibration temperature transducer.
It is mesh in conclusion how to provide a kind of calibrating installation of the temperature monitoring for temperature transducer internally-arranged type
Preceding those skilled in the art's urgent problem to be solved.
Invention content
In view of this, the object of the present invention is to provide a kind of calibrating installation for temperature monitoring, which can
With the detection device for temperature transducer internally-arranged type into the calibration of trip temperature.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of calibrating installation for temperature monitoring includes：
It is internally provided with the temperature control of temperature control element；
Heat-generating pipe for providing normal temperature for the temperature transducer of the temperature monitoring, two of the heat-generating pipe
Port is connected to outlet and the refluxing opening of the temperature control；
For the warm medium of biography in the temperature control to be transported to the controller in the heat-generating pipe.
Preferably, the heat-generating pipe includes the inner and outer tubes of nested encryptions, the lower end of said inner tube and the temperature control
The outlet of chamber processed connects, and the lower end of the outer tube is connect with the refluxing opening of the temperature control, the upper end of said inner tube and institute
State the upper end connection of outer tube.
Preferably, the outer tube upper end is provided with axial notch inside, for placing measurement criteria thermometer.
Preferably, the heat-generating pipe includes the inner and outer tubes of nested encryptions, the lower end of the outer tube and the temperature control
The outlet of chamber processed connects, and the lower end of said inner tube is connect with the refluxing opening of the temperature control, the upper end of said inner tube and institute
State the upper end connection of outer tube.
Preferably, the axial external groove for placing measurement criteria thermometer is provided on the outer wall of the outer tube.
Preferably, it is provided in the temperature control for obtaining the temperature control probe for passing warm medium temperature, it is described
Temperature control probe is connected to the processor for controlling temperature control element.
Preferably, the temperature control element includes passing temperature for controlling to pass the heater of warm medium heating and/or be used to control
The cooler of medium cooling.
Preferably, the controller is force (forcing) pump.
Preferably, the processor includes the input module for inputting preset transmission medium control temperature.
In above-mentioned apparatus, the complete media flow loop of a closure is formed by temperature control and heat-generating pipe,
Temperature control element is provided in temperature control, it can be to passing control of the warm medium into trip temperature, controller can control temperature
Biography temperature medium after the temperature adjustment of intracavitary is transmitted in heat-generating pipe, allows biography temperature medium recycle stream in complete circuit
It is dynamic.By the way that warm medium circulation flowing will be passed in the loop, the equal of fever pipe surface temperature value everywhere or temperature change ensure that
Even unification, so as to provide normal temperature environment for temperature transducer, convenient for carrying out school to the temperature measurement of temperature transducer
Just.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of the calibrating installation provided by the present invention for temperature monitoring；
Fig. 2 is the A-A direction views of Fig. 1.
1 be heat-generating pipe, 11 be inner tube, 12 be outer tube, 2 be temperature control, 3 be heater, 4 be temperature probe, 5 for into
Liquid mouth, 6 be liquid outlet, 7 be measurement criteria thermometer.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Core of the invention is to provide a kind of calibrating installation for temperature monitoring, which can be directed to thermometric
Calibration of the detection device of sensor internally-arranged type into trip temperature.
Please refer to Fig.1 and Fig. 2, Fig. 1 be the calibrating installation provided by the present invention for temperature monitoring structural representation
Figure；Fig. 2 is the A-A direction views of Fig. 1.
A kind of calibrating installation for temperature monitoring provided by the invention is mainly used for as temperature transducer internally-arranged type
Temperature detector is into the correction of trip temperature, including temperature control 2, heat-generating pipe 1 and controller.Wherein, temperature control 2 is one
A closed cavity passes warm medium for accommodating, several outlets and entrance is provided on cavity, is arranged in portion in the cavity
It is useful for the temperature control element that control passes the temperature of warm medium.Heat-generating pipe 1 is mainly used for as normal temperature source as temperature monitoring
Temperature transducer provide normal temperature, two ports of heat-generating pipe 1 are connected to the outlet and reflux of temperature control 2
Mouthful, that is to say, that the biography temperature medium in temperature control 2 can enter heat-generating pipe 1 by outlet, after heat-generating pipe 1, from hair
Another port of heat pipe 1 enters the refluxing opening of temperature control 2.Controller is used for the biography temperature medium in temperature control 2
It is transported in heat-generating pipe 1, circulating for warm medium is passed to be formed.
Above-mentioned apparatus use process is as follows：First, adjustment of the warm medium into trip temperature will be passed in temperature control 2；
Then, warm medium will be passed by controller to be delivered in heat-generating pipe 1, warm medium is passed and generate heat by heat-generating pipe 1, and with heat-generating pipe 1
It transmits, passes warm medium and temperature control 2 is returned to by refluxing opening.
In above-mentioned apparatus, a media flow loop being closed, complete is formed by temperature control 2 and heat-generating pipe 1,
It is provided with temperature control element in temperature control 2, it can be to passing warm medium into the control of trip temperature, controller can be by temperature control
Biography temperature medium in chamber 2 processed after temperature adjustment is transmitted in heat-generating pipe 1, allows biography temperature medium recycle stream in complete circuit
It is dynamic.By the way that warm medium circulation flowing will be passed in the loop, the equal of 1 surface of heat-generating pipe temperature value everywhere or temperature change ensure that
Even unification, so as to be corrected to the temperature measurement of temperature transducer.
It needs it is to be noted that the planform of above-mentioned heat-generating pipe 1 and without concrete restriction, heat-generating pipe 1 can have more
Kind form and structure are constituted.In view of above-mentioned apparatus is the survey for analog conducting wire to adjust temperature transducer to conductor temperature
Amount, so the structure of heat-generating pipe 1 should be similar with the shape and structure of conducting wire as possible.
It needs it is to be noted that the biography temperature medium in above-mentioned apparatus can be liquid medium or gas medium, liquid medium
In can select silicone oil etc..
For the structure of heat-generating pipe 1, in a specific embodiment provided by the present invention, heat-generating pipe 1 includes nested connects
The inner tube 11 and outer tube 12 connect, the same length of inner tube 11 and outer tube 12, the lower end of inner tube 11 and going out for temperature control 2
Mouth connection, the lower end of outer tube 12 are connect with the refluxing opening of temperature control 2, and the upper end of inner tube 11 is connected to the upper end of outer tube 12,
The upper end of outer tube 12 can be to block end.In above-mentioned apparatus, upper end and the upper end of inner tube 11 of outer tube 12 are the back-shaped knot being connected to
Structure.
It needs it is to be noted that inner tube 11 and outer tube 12 are conventional tubular structure.Upper end that above-described embodiment is previously mentioned and
Lower end is used for the purpose of distinguishing the difference at both ends on direction, it is not limited to which upper end either lower end, heat-generating pipe 1 can also be
It is horizontal positioned or tilting.
Optionally, can be the same with above-described embodiment, the entrance and exit of heat-generating pipe 1 is located at the same end of heat-generating pipe 1,
The both ends of heat-generating pipe 1 can be located at.As can be seen from the above-described embodiment, by being arranged entrance and exit in heat-generating pipe 1
The same end, can effectively improve the utilization rate of heat-generating pipe 1, the connection with temperature measurement sensing equipment can also be made more convenient.
It on the basis of above-described embodiment, can in order to facilitate the setting of the measurement criteria thermometer of temperature measurement sensing equipment
Inside axial notch to be arranged in the upper end of outer tube 12, i.e., it is arranged to recessed inside outer tube 12 in the endface of 12 upper end of outer tube
Slot, the groove are mainly used for placing measurement criteria thermometer.
It needs it is to be noted that the measurement criteria temperature provided in the application is calculated as the measurement standard in calibration process.
In above-mentioned apparatus, on the one hand the setting of axial notch makes the placement location of measurement criteria thermometer be resolved,
On the other hand the contact area of outer tube 12 and measurement criteria thermometer is increased.
Similar with the content that above-described embodiment is provided, the present invention also provides a kind of set-up mode of heat-generating pipe 1, hairs
Heat pipe 1 includes the inner tube 11 and outer tube 12 of nested encryptions, and the lower end of outer tube 12 is connect with the outlet of temperature control 2, inner tube 11
Lower end connect with the refluxing opening of temperature control 2, the upper end of inner tube 11 is connected to the upper end of outer tube 12, similarly, outer tube 12
Upper surface there is end cap, be used to form and external closure.
In the device that the present embodiment is provided, the flow direction of heat transfer medium is adjusted, i.e., heat transfer medium is by temperature
The outlet for spending control chamber 2 enters heat-generating pipe 1 by the lower end of outer tube 12, and flows into inner tube 11 by the upper end of outer tube 12, and from interior
The lower end of pipe 11 flows into the refluxing opening of temperature control 2.
Optionally, measurement criteria thermometer is placed for convenience, can be arranged on the outer wall of above-mentioned apparatus middle external tube 12
Axial external groove for placing thermometer 7.For example, on the outer wall of outer tube 12, setting is parallel with the axial direction of outer tube 12
Thermometer is placed in axial external groove by groove, and is fitted with the outer wall of outer tube 12, and heat-generating pipe 1 can be effectively measured
Current Temperatures.
Since the calibrating installation of temperature monitoring device is the simulator simulated for the temperature to conducting wire, so
When calibrating temperature transducer, needs to simulate various temperature situation, need to keep this temperature-resistant, and supervise the temperature
It surveys.In a specific embodiment provided by the present invention, on the basis of above-mentioned each embodiment, in temperature control 2
Interior setting passes the temperature control probe 4 of warm medium temperature for obtaining in temperature control 2, temperature control probe 4 is connected to for controlling temperature
Control the processor of element.Processor connects temperature control element, and controls temperature control element and adjusted to the temperature of temperature control 2.Pass through
Temperature probe 4 is monitored the temperature of temperature control 2, and processor can obtain the real time temperature in temperature control 2, uses
In the adjustment to work temperature control element.
Common temperature control element is usually heater 3, and in specific embodiment provided by the present invention, temperature control element can wrap
It includes for controlling the heater 3 for passing warm medium heating, can also include for controlling the cooler or two for passing warm medium cooling
Person is provided simultaneously with.By the effect of heater 3, cooler, the adjustment of different directions can be carried out to the temperature for passing warm medium, into
And calibrating installation can be enable to simulate the conductor temperature of more kinds of situations, keep its scope of application wider.
For the controller that above-mentioned each embodiment is provided, in a specific embodiment provided by the present invention, control
Device can be force (forcing) pump, and the biography temperature medium in temperature control 2 is delivered to heat-generating pipe 1 by force (forcing) pump by pressure mode.
Optionally, controller is not limited to pressure control, or other mode of movement, such as diversion mode.
Optionally, temperature control 2 should also include inlet 5 and liquid outlet 6, for the internal dosage for passing warm medium
It is adjusted.It needs it is to be noted that above-mentioned inlet 5 and liquid outlet 6 are not limited to what interior media was had to using liquid
Situation, or gas.
In actual use, processor should include the input module for inputting preset transmission medium control temperature.
In one particular embodiment of the present invention, manufacture and design the heating bar of a diameter 22mm, length 600mm or so
1, size is identical as the conducting wire ruler diameter monitored in temperature transducer practical application, specially cylinder, hollow and external form and one section
Conducting wire is almost the same, being delivered in 1 body of heating bar by will pass warm medium in temperature control 2, making the surface temperature of heating bar 1
Degree substantially maintains within the scope of -30 to 150 degree.
1 surface temperature of heating bar should be able to keep uniform, stablize, and uniform temperature field length should can reach 400mm, uniformly
Maximum temperature point and minimum temperature point temperature gap in temperature field are no more than 0.5 DEG C, and fever rod surface temperature stability reaches
To ± 0.2 DEG C/10min.
Above-mentioned heating bar cooperation temperature control 2 and liquid pressing pump use, and ensure stick by the continuous cycle of liquid
Body surface face have about 400mm one section long, surface temperature stablize region, this section of region can be used as be analog conducting wire fever test
The thermometric accuracy performance of tested transmission line wire temperature on-line monitoring device is calibrated in source with this.
Specific use process is as follows for the device that above-described embodiment is provided：
First, user can control temperature with goal-selling, and temperature control 2 adjusts heat transfer medium into trip temperature, adjustment
To the target control temperature of setting；
Then, heat transfer medium is transmitted in the inner tube 11 of heat-generating pipe 1 by force (forcing) pump；
Then, the temperature transducer that 1 outside of heat-generating pipe is clamped can sense the bulk temperature of heat-generating pipe 1, the temperature base
Originally it remains unchanged；
Finally, heat transfer medium is back to the refluxing opening of temperature control 2 by the effect of force (forcing) pump, and obtains temperature control
2 temperature adjustment.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The calibrating installation provided by the present invention for temperature monitoring is described in detail above.It is used herein
Principle and implementation of the present invention are described for specific case, and the explanation of above example is only intended to help to understand
The method and its core concept of the present invention.It should be pointed out that for those skilled in the art, not departing from this
, can be with several improvements and modifications are made to the present invention under the premise of inventive principle, these improvement and modification also fall into the present invention
In scope of the claims.
Claims (7)
1. a kind of calibrating installation for temperature monitoring, which is characterized in that including：
It is internally provided with the temperature control (2) of temperature control element；
Heat-generating pipe (1) for providing normal temperature for the temperature transducer of the temperature monitoring, the two of the heat-generating pipe (1)
A port is connected to outlet and the refluxing opening of the temperature control (2)；
For the biography temperature medium in the temperature control (2) to be transported in the heat-generating pipe (1), so that the heat-generating pipe
(1) the uniform unified controller of surface temperature value everywhere or temperature change；It is provided in the temperature control (2) for obtaining
The temperature control probe (4) for passing warm medium temperature, the temperature control probe (4) is taken to be connected to the processing for controlling temperature control element
Device；The temperature control element includes passing warm medium drop for controlling the heater (3) for passing warm medium heating and/or for controlling
The cooler of temperature.
2. the calibrating installation according to claim 1 for temperature monitoring, which is characterized in that heat-generating pipe (1) packet
The inner tube (11) and outer tube (12) of nested encryptions are included, the lower end of said inner tube (11) connects with the outlet of the temperature control (2)
Connect, the lower end of the outer tube (12) is connect with the refluxing opening of the temperature control (2), the upper end of said inner tube (11) with it is described
The upper end of outer tube (12) is connected to.
3. the calibrating installation according to claim 2 for temperature monitoring, which is characterized in that outer tube (12) upper end
It is provided with axial notch inside, for placing measurement criteria thermometer (7).
4. the calibrating installation according to claim 1 for temperature monitoring, which is characterized in that heat-generating pipe (1) packet
The inner tube (11) and outer tube (12) of nested encryptions are included, the lower end of the outer tube (12) connects with the outlet of the temperature control (2)
Connect, the lower end of said inner tube (11) is connect with the refluxing opening of the temperature control (2), the upper end of said inner tube (11) with it is described
The upper end of outer tube (12) is connected to.
5. the calibrating installation according to claim 4 for temperature monitoring, which is characterized in that outside the outer tube (12)
The axial external groove for placing measurement criteria thermometer (7) is provided on wall.
6. the calibrating installation according to any one of claims 1 to 5 for temperature monitoring, which is characterized in that the control
Device processed is force (forcing) pump.
7. the calibrating installation according to claim 6 for temperature monitoring, which is characterized in that the processor includes using
In the input module for inputting preset transmission medium control temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074511.7A CN105738009B (en) | 2016-02-02 | 2016-02-02 | A kind of calibrating installation for temperature monitoring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610074511.7A CN105738009B (en) | 2016-02-02 | 2016-02-02 | A kind of calibrating installation for temperature monitoring |
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| CN105738009A CN105738009A (en) | 2016-07-06 |
| CN105738009B true CN105738009B (en) | 2018-09-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325063A (en) * | 2016-08-30 | 2017-01-11 | 中国科学院理化技术研究所 | Method and device for quickly cooling |
| CN107402084A (en) * | 2017-07-05 | 2017-11-28 | 明光旭升科技有限公司 | A kind of calibrating device for temperature sensor |
| DE102018125256B4 (en) * | 2018-10-12 | 2020-10-15 | Single Holding GmbH | Diagnostic procedures for temperature control devices |
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| CN201096550Y (en) * | 2007-06-26 | 2008-08-06 | 陈坚 | Recycle pump type constant temperature bath |
| CN201488841U (en) * | 2009-07-20 | 2010-05-26 | 泰安磐然测控科技有限公司 | Novel heat pipe thermostatic slot for calibrating short type temperature sensor |
| CN201848259U (en) * | 2010-11-14 | 2011-06-01 | 甘肃电力科学研究院 | Thermal tube thermostatic bath for calibration of transformer temperature controller |
| CN103115699A (en) * | 2013-02-06 | 2013-05-22 | 北京东方计量测试研究所 | Temperature equalizing system for calibration of temperature sensors in vacuum |
| US8851744B1 (en) * | 2013-10-02 | 2014-10-07 | Onicon, Inc. | Calibration apparatus and method for heat transfer measurement |
| CN204924499U (en) * | 2015-07-22 | 2015-12-30 | 张晨曦 | Heat pipe thermotank |
| CN205538031U (en) * | 2016-02-02 | 2016-08-31 | 国网浙江省电力公司电力科学研究院 | A calibrating device for temperature monitoring ware |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8801271B2 (en) * | 2008-10-27 | 2014-08-12 | Ametek Denmark A/S | Calibration apparatus |
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2016
- 2016-02-02 CN CN201610074511.7A patent/CN105738009B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2422152A1 (en) * | 1978-04-04 | 1979-11-02 | Siderurgie Fse Inst Rech | Measurement of surface temperature adjacent to furnace - employs thermocouple shielded by kaolin wool in annular steel support |
| CN201096550Y (en) * | 2007-06-26 | 2008-08-06 | 陈坚 | Recycle pump type constant temperature bath |
| CN201488841U (en) * | 2009-07-20 | 2010-05-26 | 泰安磐然测控科技有限公司 | Novel heat pipe thermostatic slot for calibrating short type temperature sensor |
| CN201848259U (en) * | 2010-11-14 | 2011-06-01 | 甘肃电力科学研究院 | Thermal tube thermostatic bath for calibration of transformer temperature controller |
| CN103115699A (en) * | 2013-02-06 | 2013-05-22 | 北京东方计量测试研究所 | Temperature equalizing system for calibration of temperature sensors in vacuum |
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