CN107101747A - A kind of standard thermometer and its application method - Google Patents
A kind of standard thermometer and its application method Download PDFInfo
- Publication number
- CN107101747A CN107101747A CN201710054031.9A CN201710054031A CN107101747A CN 107101747 A CN107101747 A CN 107101747A CN 201710054031 A CN201710054031 A CN 201710054031A CN 107101747 A CN107101747 A CN 107101747A
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- temperature
- standard thermometer
- thermometer
- temperature sensor
- standard
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000003196 chaotropic effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003068 static effect Effects 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
- G01K15/002—Calibrated temperature sources, temperature standards therefor
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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 standard thermometer and its application method, to be calibrated to special temperature sensor.Standard thermometer, including：Temperature-sensitive portion and the lead being placed in outer tube, wherein：Outer tube, it is U-shaped.Standard thermometer is when being vertically arranged in liquid, the pipe U-shaped distance from bottom liquid level 250mm of overcoat.It is preferred that standard thermometer is when being vertically arranged in liquid, temperature-sensitive portion is apart from liquid level 20mm.Using the present invention, can make temperature-sensitive portion be in distinct temperature sensor identical measuring environment so that obtain it is accurate the need for the result calibrated.
Description
Technical field
The present invention relates to field of measuring technique, more particularly to a kind of standard thermometer and its application method.
Background technology
Fig. 1 is thermometer structural representation, as illustrated, general thermometer includes temperature sensor and digital instrument two
Point, temperature sensor includes temperature-sensing element, lead and the part of outer tube three.The function of temperature sensor is to utilize temperature-sensing element sense
It is sent to by temperature change, and by the analog signal of generation by lead in digital instrument, the effect of outer tube is protection temperature-sensitive
Element and lead wire insulation simultaneously keep certain shape, and outer tube typically uses thin-wall metal blind pipe.Digital instrument is used for will simulation
Signal is amplified, analog/digital conversion data signal, is obtained temperature value by calculating and is shown.
For ensure temperature sensor measurement indicating value it is accurate, in temperature sensor before use, need progress indicating value calibration.
Usually in the lab, using high-precision standard thermometer, it is put into together with the temperature sensor being calibrated in thermostat,
Position deep enough is inserted, by thermostat control on some temperature spot is such as near 70 DEG C, after after temperature stabilization, (such as 69.95 DEG C
~70.05 DEG C).According to the zeroth law of thermodynamics, same temperature should be had by being calibrated thermometer and standard thermometer, successively
The indicating value for being calibrated thermometer and standard thermometer is read, both differences are calculated, you can obtain being calibrated the error of thermometer.
The deficiencies in the prior art are, for some special temperature sensors, and calibration thermometer can not meet phase therewith
With measuring environment, therefore can not obtain it is accurate the need for the error calibrated.
The content of the invention
The invention provides a kind of standard thermometer and its application method, to carry out school to special temperature sensor
It is accurate.
Standard thermometer provided in an embodiment of the present invention, including：Temperature-sensitive portion and the lead being placed in outer tube, wherein：
Outer tube, it is U-shaped.
It is preferred that the pipe U-shaped bottom of overcoat is more than 250mm from U-shaped top.
It is preferred that standard thermometer is when being vertically arranged in liquid, the pipe U-shaped distance from bottom liquid level 250mm of overcoat.
It is preferred that standard thermometer is when being vertically arranged in liquid, the distance in temperature-sensitive portion chaotropic face and object temperature-sensitive to be measured
The distance in portion chaotropic face is consistent.
It is preferred that standard thermometer is when being vertically arranged in liquid, temperature-sensitive portion is apart from liquid level 20mm.
The present invention has the beneficial effect that：
From above-mentioned implementation, because the outer tube of standard thermometer is U-shaped, therefore on the one hand can be according to relevant rule
It is fixed, to prevent influence of the standard thermometer outer tube leakage heat to calibration accuracy, it is ensured that standard thermometer submergence reaches will
Ask, for example, reach 250mm；On the other hand, when in face of special temperature sensor calibration, because temperature-sensitive portion is at U-shaped top,
Therefore can make temperature-sensitive portion be in distinct temperature sensor identical measuring environment so that obtain it is accurate the need for the knot calibrated
Really.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is thermometer structural representation in background technology；
Insertion depth schematic diagram when Fig. 2 is Plays thermometer calibration conventional temperature sensor of the embodiment of the present invention；
Insertion depth schematic diagram when Fig. 3 is Plays thermometer calibration temperature sensor for vehicle of the embodiment of the present invention；
Fig. 4 is Plays thermometer structural representation of the embodiment of the present invention；
Schematic diagram is calibrated when Fig. 5 is in the embodiment of the present invention to temperature sensor for vehicle.
Embodiment
Inventor notices during invention：
Insertion depth schematic diagram when Fig. 2 is normal temperature meter calibrating conventional temperature sensor, as shown in Fig. 2 to ensure temperature
Spend sensor measurement indicating value it is accurate, in temperature sensor before use, need progress indicating value calibration.Usually in laboratory
In, using high-precision standard thermometer, it is put into together with the temperature sensor being calibrated in thermostat, inserts position deep enough
Put, by thermostat control on some temperature spot is such as near 70 DEG C, after after temperature stabilization, (such as 69.95 DEG C~70.05 DEG C).Root
According to the zeroth law of thermodynamics, same temperature should be had by being calibrated thermometer and standard thermometer, successively read and be calibrated temperature
The indicating value of degree meter and standard thermometer, calculates both differences, you can obtain being calibrated the error of thermometer.
To ensure the degree of accuracy of calibration, reduce thermometer outer tube and cause what Lou heat affecting was calibrated because submergence is too short
The degree of accuracy.Enough depth will be submerged by being calibrated temperature sensor and standard thermometer, be promulgated according to State General Administration for Quality Supervision
《Standard mercury thermometer vertification regulation JJG161-2010》Middle 7.3.4.3 requirement and《Standard mercury thermometer vertification regulation
JJG130-2011》Middle 7.3.3.2 requirement, the submergence of standard thermometer can not be less than 250mm.Due to by constant temperature bath temperature
Temperature on the technical limitation of field, different level is had in certain difference (being referred to as vertical temperature-difference), same level
Also there can be certain temperature difference (being referred to as the horizontal temperature difference).The mean level temperature difference is far smaller than vertical temperature-difference.So in actual alignment (inspection
It is fixed) during, all it is placed on same level the temperature-sensitive position of temperature sensor and the temperature-sensitive position of standard thermometer is calibrated
On face.The outer tube of standard thermometer and Temperature Transducer in Common Use is longer, generally higher than 300mm, it is possible to insert 250mm deep
Degree.
But, for some special temperature sensors, under aforesaid way, calibration thermometer can not meet same
Measuring environment, thus can not obtain it is accurate the need for the error calibrated.Carried out below by taking the calibration of temperature sensor for vehicle as an example
Explanation.
Insertion depth schematic diagram when Fig. 3 is normal temperature meter calibrating temperature sensor for vehicle, as shown in figure 3, automobile-used temperature
Sensor is generally used for the measurement of engine and line temperature, and temperature sensor for vehicle length is in 20mm or so, and size is shorter.
When carrying out laboratory investment, it is desirable to according to actual use situation, determine that submergence, i.e. submergence only have 20mm or so.
But according to pertinent regulations, to prevent influence of the standard thermometer outer tube leakage heat to calibration accuracy, standard temperature
Degree meter must submergence reach 250mm.But due to thermostat two depth of 250mm and 20mm horizontal plane temperature exist compared with
Big gap, is shown in Fig. 2, and environment temperature is t0, constant temperature groove depth is that the temperature at 250mm is t1, and constant temperature groove depth is at 20mm
Temperature be tx, txBetween t0And t1Between.In this case, standard thermometer is in two temperature with temperature sensor for vehicle
Under, comparativity is poor, and now the degree of accuracy of temperature indicating value calibration result is not high.
Based on this, to ensure that the calibration to distinct temperature sensor obtains sufficiently high calibration accuracy, the present invention is implemented
A kind of calibration thermometer is provided in example, and the use of the thermometer is illustrated.
Fig. 4 is standard thermometer structural representation, as illustrated, can include：Temperature-sensitive portion 401 and it is placed in outer tube
Lead 403 in 402, wherein：
Outer tube, it is U-shaped.
In implementation, thermometer protective sleeve is enclosed on outside temperature element, can also be pre-installed in band pressure inconvenience dismounting
Device on, play resist measurement medium pressure and corrosiveness, make the instrument such as thermocouple, thermal resistance, bimetallic thermometer
Can normal work.
Important technological parameters：
Nominal pressure：Generally refer at normal temperatures, the static external pressure that protection pipe can bear is without rupturing.Allow work pressure
Power not only with protection tube material, diameter, wall thickness is relevant, and with its structure type, the flow velocity of installation method and measured medium, species
It is relevant.
Hydrostatic test：When being required to the pressure-resistant of protection pipe and leakage inspection, protection pipe must be tested.Test pressure
For 15 times of protection pipe stress levels.
X-ray inspection is tested：, can be by user's requirement when the item inspection such as eccentric throw is required to the wall thickness of protection pipe
Checked.
In implementation, temperature-sensitive portion can have the part of similar functions using temperature-sensing element described in Fig. 1 etc..
In implementation, the pipe U-shaped bottom of overcoat is more than 250mm from U-shaped top.
In implementation, standard thermometer is when being vertically arranged in liquid, the pipe U-shaped distance from bottom liquid level 250mm of overcoat.
In implementation, standard thermometer is when being vertically arranged in liquid, the distance in temperature-sensitive portion chaotropic face and object temperature-sensitive to be measured
The distance in portion chaotropic face is consistent.
In implementation, standard thermometer is when being vertically arranged in liquid, and temperature-sensitive portion is apart from liquid level 20mm.
Below still with being illustrated exemplified by the calibration of temperature sensor for vehicle.It is readily appreciated that, to the school of temperature sensor
Accurate its, which is characterized by, to be made standard thermometer and is calibrated temperature sensor to be placed under identical conditions, with comparativity, because
This, with reference to the calibration to temperature sensor for vehicle, to make corresponding improvement, both can be used for other special temperature sensors
Calibration.
Fig. 5 calibrates schematic diagram when being to temperature sensor for vehicle, as shown in figure 5, accurate to ensure to obtain sufficiently high calibration
Exactness, when ensureing that temperature sensor for vehicle submergence meets actual operation requirements, by the temperature sensor being calibrated and mark
The temperature-sensitive position of quasi- thermometer is in same level, and the leakage heat affecting for avoiding standard thermometer outer tube from bringing.
In implementation, because thermometer wrap length of tube is longer and uses U-shaped design, liquid is being immersed according to above-mentioned submergence
Afterwards, from temperature-sensing element position until the considerably long one section outer tube closed at the page is stretched all in isothermal region in outer tube
The leakage heat occurred at page-out, does not interfere with the equalized temperature at temperature-sensing element.
As illustrated, after outer tube is extended, standard thermometer being bent into " U " type be put in thermostat, after submergence, folding
Line bottom is 250mm away from upper liquid level；
Temperature sensor for vehicle submergence is 20mm or so, and the temperature-sensitive portion submergence of standard thermometer is also left for 20mm
The right side, that is, standard thermometer temperature-sensitive part touches temperature sensor for vehicle from bottom to top.
From above-mentioned implementation, because the outer tube of standard thermometer is U-shaped, therefore on the one hand can be according to relevant rule
It is fixed, to prevent influence of the standard thermometer outer tube leakage heat to calibration accuracy, it is ensured that standard thermometer submergence reaches will
Ask, for example, reach 250mm；On the other hand, when in face of special temperature sensor calibration, because temperature-sensitive portion is at U-shaped top,
Therefore can make temperature-sensitive portion be in distinct temperature sensor identical measuring environment so that obtain it is accurate the need for the mistake calibrated
Difference.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (9)
1. a kind of standard thermometer, it is characterised in that including：Temperature-sensitive portion and the lead being placed in outer tube, wherein：
Outer tube, it is U-shaped.
2. standard thermometer as claimed in claim 1, it is characterised in that the pipe U-shaped bottom of overcoat is more than from U-shaped top
250mm。
3. standard thermometer as claimed in claim 1, it is characterised in that standard thermometer is when being vertically arranged in liquid, outside
The pipe U-shaped distance from bottom liquid level 250mm of set.
4. standard thermometer as claimed in claim 1, it is characterised in that standard thermometer is when being vertically arranged in liquid, sense
The distance in warm portion's chaotropic face is consistent with the distance in object temperature-sensitive portion chaotropic face to be measured.
5. standard thermometer as claimed in claim 1, it is characterised in that standard thermometer is when being vertically arranged in liquid, sense
Warm portion is apart from liquid level 20mm.
6. a kind of application method of standard thermometer as described in claim 1 to 5 is any, it is characterised in that including：
When calibrating temperature sensor, in the same environment of temperature sensor that temperature-sensitive portion is placed in and is calibrated.
7. method as claimed in claim 6, it is characterised in that further comprise：
Standard thermometer is when being vertically arranged in liquid, the pipe U-shaped distance from bottom liquid level 250mm of overcoat.
8. method as claimed in claim 6, it is characterised in that further comprise：
Standard thermometer is when being vertically arranged in liquid, and temperature-sensitive portion is apart from liquid level 20mm.
9. the method as described in claim 6 to 8 is any, it is characterised in that the temperature sensor is temperature sensor for vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710054031.9A CN107101747A (en) | 2017-01-22 | 2017-01-22 | A kind of standard thermometer and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710054031.9A CN107101747A (en) | 2017-01-22 | 2017-01-22 | A kind of standard thermometer and its application method |
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| Publication Number | Publication Date |
|---|---|
| CN107101747A true CN107101747A (en) | 2017-08-29 |
Family
ID=59676396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710054031.9A Pending CN107101747A (en) | 2017-01-22 | 2017-01-22 | A kind of standard thermometer and its application method |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307808A (en) * | 2019-07-11 | 2019-10-08 | 中国航发哈尔滨东安发动机有限公司 | A kind of temperature sensor location inspection method of accuracy |
| CN110411592A (en) * | 2019-08-28 | 2019-11-05 | 广州计量检测技术研究院 | Standard thermometer measurement servicing unit and its application method |
| EP4148405A1 (en) * | 2021-09-08 | 2023-03-15 | Ametek Denmark A/s | System for calibrating a sensor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454641A (en) * | 1994-01-13 | 1995-10-03 | Ranco Incorporated Of Delaware | Temperature transducer assembly |
| CN201163219Y (en) * | 2007-12-20 | 2008-12-10 | 贵州黎阳航空发动机公司 | Armored thermal resistor calibrating device for aircraft engine |
| CN201163220Y (en) * | 2007-12-20 | 2008-12-10 | 贵州黎阳航空发动机公司 | Armored thermocouple calibrating device for aircraft engine |
| CN201672994U (en) * | 2010-05-31 | 2010-12-15 | 南京工程学院 | Automobile coolant temperature sensor testing device |
| 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 |
| CN105333967A (en) * | 2014-08-08 | 2016-02-17 | 许保康 | U-shaped thermometer in object |
| CN105588667A (en) * | 2015-12-18 | 2016-05-18 | 上海市计量测试技术研究院 | High-precision thermistor thermometer calibrating device |
| CN206725125U (en) * | 2017-01-22 | 2017-12-08 | 北京交通发展研究院 | A kind of standard thermometer |
-
2017
- 2017-01-22 CN CN201710054031.9A patent/CN107101747A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454641A (en) * | 1994-01-13 | 1995-10-03 | Ranco Incorporated Of Delaware | Temperature transducer assembly |
| CN201163219Y (en) * | 2007-12-20 | 2008-12-10 | 贵州黎阳航空发动机公司 | Armored thermal resistor calibrating device for aircraft engine |
| CN201163220Y (en) * | 2007-12-20 | 2008-12-10 | 贵州黎阳航空发动机公司 | Armored thermocouple calibrating device for aircraft engine |
| CN201672994U (en) * | 2010-05-31 | 2010-12-15 | 南京工程学院 | Automobile coolant temperature sensor testing device |
| CN105333967A (en) * | 2014-08-08 | 2016-02-17 | 许保康 | U-shaped thermometer in object |
| 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 |
| CN105588667A (en) * | 2015-12-18 | 2016-05-18 | 上海市计量测试技术研究院 | High-precision thermistor thermometer calibrating device |
| CN206725125U (en) * | 2017-01-22 | 2017-12-08 | 北京交通发展研究院 | A kind of standard thermometer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307808A (en) * | 2019-07-11 | 2019-10-08 | 中国航发哈尔滨东安发动机有限公司 | A kind of temperature sensor location inspection method of accuracy |
| CN110411592A (en) * | 2019-08-28 | 2019-11-05 | 广州计量检测技术研究院 | Standard thermometer measurement servicing unit and its application method |
| EP4148405A1 (en) * | 2021-09-08 | 2023-03-15 | Ametek Denmark A/s | System for calibrating a sensor |
| WO2023036816A1 (en) * | 2021-09-08 | 2023-03-16 | Ametek Denmark A/S | System for calibrating a sensor |
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Application publication date: 20170829 |
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