CN110487446A - A kind of modification method of electric conduction thermometer deviation - Google Patents
A kind of modification method of electric conduction thermometer deviation Download PDFInfo
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- CN110487446A CN110487446A CN201910845396.2A CN201910845396A CN110487446A CN 110487446 A CN110487446 A CN 110487446A CN 201910845396 A CN201910845396 A CN 201910845396A CN 110487446 A CN110487446 A CN 110487446A
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- thermometer
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- 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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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention relates to field of thermometers, and the invention discloses a kind of modification methods of electric conduction thermometer deviation, including S1, selection test point；S2, thermometer is submerged；The detection of S3, each test point；S4, reading；S5, the deviation for calculating dut temperature meter, it is contemplated that the measurement error of standard thermometer, the deviation and variation of thermostat temperature improve the thermometer problem low due to amendment accuracy caused by deviation inaccuracy.
Description
Technical field
The present invention relates to thermometer technical field more particularly to a kind of modification methods of electric conduction thermometer deviation.
Background technique
The general perseverance using the different temperatures that dut temperature meter is put into setting together with standard thermometer in the prior art
Method in warm slot carries out drift correction to electric conduction thermometer, but the deviation of electric conduction thermometer is easy by thermostat
The influence of temperature deviation, there are the measurement errors of standard thermometer for the thermostat temperature on the one hand obtained by standard thermometer, separately
The unstable measurement result that will affect standard thermometer and dut temperature meter of one side thermostat temperature, and thermostat temperature
It can also be influenced by environment temperature and time and deviate set temperature, the thermometer deviation inaccuracy caused, thermometer
Amendment accuracy is affected.
Summary of the invention
(1) technical problems to be solved
Based on the above issues, the present invention provides a kind of modification method of electric conduction thermometer deviation, and it is inclined to improve thermometer
The accuracy of difference.
(2) technical solution
Based on above-mentioned technical problem, the present invention provides a kind of modification method of electric conduction thermometer deviation, the side
Method the following steps are included:
S1, choose test point: test point should be evenly distributed in the entire measurement range of thermometer, it is necessary to including measurement
Upper and lower limit must not be less than 4 points, and the thermometer for having zero point should include zero point；
S2, thermometer is submerged by prescribed requirement；
The detection of S3, each test point: having the first detection zero point of zero point, will test element insertion and fills ice, aqueous mixtures
In ice bath or thermostat；When other each points detect, it will test in element and standard thermometer insertion thermostat；And by positive and negative
It is carried out point by point to the upper limit or lower limit direction respectively on two strokes, only carries out one-stroke detection when measuring upper limit value and lower limit value；
S4, it is read after indicating value is stablized, keeps temperature to stablize, write down standard thermometer and dut temperature meter respectively
The reading value of positive and negative stroke；
S5, the deviation for calculating dut temperature meter:
S5.1, thermostat actual temperature is calculated:
When selecting secondary standard mercurial thermometer, secondary standard mercuri temperature to be counted as standard thermometer, thermostat is practical
Temperature T is calculated as follows:
T=t '+A,
In formula, t ' is the indicating value of standard thermometer, and A is the correction value of standard thermometer；
When selecting standard copper-CopperNickel thermocouple to make normal temperature timing, thermostat actual temperature is calculated as follows:
In formula, t0For test point nominal temperature, thermo-electromotive force when Δ e is corresponding and the temperature T measured when actual measurement in advance
The thermoelectricity relational expression of the standard first provided calculate in test point nominal temperature t0When electromotive force difference, (de/dt)tFor detection
Point thermo-electromotive force change rate, at 0 DEG C or more, (de/dt)t=a1+2a2t+3a3t2, a1,a2,a3For the standard that provides in advance
The coefficient of thermoelectricity relational expression；At 0 DEG C or less, (de/dt)t=b1+2b2t+3b3t2, b1,b2,b3For the standard that provides in advance
The coefficient of thermoelectricity relational expression；
S5.2, the deviation for calculating dut temperature meter:
Y=t-T,
That is y=t- (t '+A),
Or
In formula, y is the deviation of dut temperature meter, and t is the indicating value of dut temperature meter, and T is thermostat actual temperature.
Preferably, upper and lower limit should be set pointer and is respectively placed on the position other than upper and lower limit by the thermometer.
Preferably, reading value described in step S4 should estimate the 1/10 of scale division value.
Preferably, in reading process described in step S4, thermostat temperature should be kept to stablize, when thermostat temperature does not surpass
When crossing 300 DEG C, thermostat temperature change should not exceed 0.1 DEG C, when thermostat temperature is more than 300 DEG C, and thermostat temperature becomes
Change should not exceed 0.5 DEG C.
Preferably, in reading process described in step S4, thermostat temperature departure test point temperature, electric contact type pressure
Thermometer must not exceed ± 0.5 DEG C, and electric contact type bimetallic thermometer must not exceed ± 2.0 DEG C, be subject to standard thermometer.
Preferably, the deviation of dut temperature meter described in step S5 must not exceed the class of accuracy of range multiplied by ±
1% times.
(3) beneficial effect
Above-mentioned technical proposal of the invention has the advantages that
(1) present invention is directed to two distinct types of standard thermometer, is corrected respectively to thermostat actual temperature,
Keep the accuracy of dut temperature meter deviation higher；
(2) present invention is directed to electricity relative to the deviation value of test point temperature to the thermostat temperature in reading process respectively and connects
The type of point type thermometer is defined, and is made the temperature of thermostat according to the measurement accuracy feature of different type thermometer, is protected
It holds in allowable range, reduces the influence to dut temperature meter deviation；
(3) present invention has also carried out the restriction for dividing temperature section to the variation range of the thermostat temperature in reading process, makes
The temperature of thermostat is able to maintain in reasonable variation range, and the temperature change of thermostat is avoided to influence the calculated result of deviation,
And divide the restriction range of temperature section more reasonable, flexible；
(4) modification method of electric conduction thermometer deviation of the present invention is suitable for the electric contact type temperature of each type
Count the amendment of deviation.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 is the flow diagram of the modification method of electric conduction thermometer of embodiment of the present invention deviation.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
The invention discloses a kind of modification methods of electric conduction thermometer deviation, as shown in Figure 1, the method includes with
Lower step:
S1, choose test point: test point should be evenly distributed in the entire measurement range of thermometer, it is necessary to including measurement
Upper and lower limit must not be less than 4 points, and the thermometer that have zero point should include zero point, and should will thereon, lower limit set pointer sets respectively
On position other than upper and lower limit；
S2, thermometer is submerged by prescribed requirement；When the temperature is calculated as electric contact type pressure and temp timing, thermometer bulb is answered
All submergences, drawing long tube submergence cannot be less than the 1/3 of pipe range, and gauge outfit answers right angle setting, and gauge outfit and the difference in height of thermometer bulb should not
Greater than 1m；
The detection of S3, each test point: having the first detection zero point of zero point, will test element insertion and fills ice, aqueous mixtures
In ice bath or thermostat；When other each points detect, it will test in element and standard thermometer insertion thermostat；Electric contact type pressure
The detecting element of power thermometer is thermometer bulb, and the detecting element of electric contact type bimetallic thermometer is by different two kinds of the coefficient of expansion
The temperature-sensing element that metal forms together with alloy sheet firm connection coiling；By on positive and negative two strokes respectively to the upper limit or under
Limit direction carries out point by point, only carries out one-stroke detection when measuring upper limit value and lower limit value；
S4, it is read after indicating value is stablized, keeps temperature to stablize, write down standard thermometer and dut temperature meter respectively
The reading value of positive and negative stroke, sight should be perpendicular to scale, when being read using magnifying glass when reading, and sight should be by magnifying glass
The heart, when reading, should estimate the 1/10 of scale division value；
In reading process, thermostat temperature to be kept to stablize, when thermostat temperature is no more than 300 DEG C, thermostat
Temperature change should not exceed 0.1 DEG C, and when thermostat temperature is more than 300 DEG C, thermostat temperature change should not exceed 0.5 DEG C；And
Thermostat temperature departure test point temperature, electric contact type pressure thermometer must not exceed ± 0.5 DEG C, electric contact type bi-metal temperature
Meter must not exceed ± 2.0 DEG C, and standard thermometer of being subject to should adjust undesirable set of thermostat changing value and deviation value
Thermostat is read again after so that thermostat changing value and deviation value is met the requirements；
S5, the deviation for calculating dut temperature meter:
S5.1, thermostat actual temperature is calculated:
When selecting secondary standard mercurial thermometer, secondary standard mercuri temperature to be counted as standard thermometer, thermostat is practical
Temperature T is calculated as follows:
T=t '+A,
In formula, t ' is the indicating value of standard thermometer, and A is the correction value of standard thermometer；
When selecting standard copper-CopperNickel thermocouple to make normal temperature timing, thermostat actual temperature is calculated as follows:
In formula, t0For test point nominal temperature, thermo-electromotive force when Δ e is corresponding and the temperature T measured when actual measurement in advance
The thermoelectricity relational expression of the standard first provided calculate in test point nominal temperature t0When electromotive force difference, (de/dt)tFor detection
Point thermo-electromotive force change rate, at 0 DEG C or more, (de/dt)t=a1+2a2t+3a3t2, a1,a2,a3For the standard that provides in advance
The coefficient of thermoelectricity relational expression；At 0 DEG C or less, (de/dt)t=b1+2b2t+3b3t2, b1,b2,b3For the standard that provides in advance
The coefficient of thermoelectricity relational expression；
S5.2, the deviation for calculating dut temperature meter:
Y=t-T,
That is y=t- (t '+A),
Or
In formula, y is the deviation of dut temperature meter, and t is the indicating value of dut temperature meter, and T is thermostat actual temperature.
The deviation of dut temperature meter must not exceed the class of accuracy of range multiplied by ± 1% times.
In summary, it by a kind of modification method of above-mentioned electric conduction thermometer deviation, has the advantages that
(1) present invention is directed to two distinct types of standard thermometer, is corrected respectively to thermostat actual temperature,
Keep the accuracy of dut temperature meter deviation higher；
(2) present invention is directed to electricity relative to the deviation value of test point temperature to the thermostat temperature in reading process respectively and connects
The type of point type thermometer is defined, and is made the temperature of thermostat according to the measurement accuracy feature of different type thermometer, is protected
It holds in allowable range, reduces the influence to dut temperature meter deviation；
(3) present invention has also carried out the restriction for dividing temperature section to the variation range of the thermostat temperature in reading process, makes
The temperature of thermostat is able to maintain in reasonable variation range, and the temperature change of thermostat is avoided to influence the calculated result of deviation,
And divide the restriction range of temperature section more reasonable, flexible；
(4) modification method of electric conduction thermometer deviation of the present invention is suitable for the electric contact type temperature of each type
Count the amendment of deviation.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Embodiments of the present invention are described in conjunction with the accompanying, but those skilled in the art can not depart from spirit and model of the invention
Various modifications and variations are made in the case where enclosing, such modifications and variations each fall within the range being defined by the appended claims
Within.
Claims (6)
1. a kind of modification method of electric conduction thermometer deviation, which is characterized in that the described method comprises the following steps:
S1, choose test point: test point should be evenly distributed in the entire measurement range of thermometer, it is necessary to upper and lower including measuring
Limit must not be less than 4 points, and the thermometer for having zero point should include zero point；
S2, thermometer is submerged by prescribed requirement；
The detection of S3, each test point: having the first detection zero point of zero point, will test the freezing point that element insertion fills ice, aqueous mixtures
In slot or thermostat；When other each points detect, it will test in element and standard thermometer insertion thermostat；And press positive and negative two
It is carried out point by point to the upper limit or lower limit direction respectively on stroke, only carries out one-stroke detection when measuring upper limit value and lower limit value；
S4, read after indicating value is stablized, temperature kept to stablize, write down respectively standard thermometer and dut temperature meter just,
The reading value of revesal；
S5, the deviation for calculating dut temperature meter:
S5.1, thermostat actual temperature is calculated:
When selecting secondary standard mercurial thermometer, secondary standard mercuri temperature to be counted as standard thermometer, thermostat actual temperature T
It is calculated as follows:
T=t '+A,
In formula, t ' is the indicating value of standard thermometer, and A is the correction value of standard thermometer；
When selecting standard copper-CopperNickel thermocouple to make normal temperature timing, thermostat actual temperature is calculated as follows:
In formula, t0For test point nominal temperature, thermo-electromotive force when Δ e is the corresponding T with temperature measured when actual measurement with provide in advance
Standard thermoelectricity relational expression calculate in test point nominal temperature t0When electromotive force difference, (de/dt)tFor test point thermoelectricity
Kinetic potential change rate, at 0 DEG C or more, (de/dt)t=a1+2a2t+3a3t2, a1,a2,a3It is closed for the thermoelectricity of the standard provided in advance
It is the coefficient of formula；At 0 DEG C or less, (de/dt)t=b1+2b2t+3b3t2, b1,b2,b3It is closed for the thermoelectricity of the standard provided in advance
It is the coefficient of formula；
S5.2, the deviation for calculating dut temperature meter:
Y=t-T,
That is y=t- (t '+A),
Or
In formula, y is the deviation of dut temperature meter, and t is the indicating value of dut temperature meter, and T is thermostat actual temperature.
2. a kind of modification method of electric conduction thermometer deviation according to claim 1, which is characterized in that the temperature
Upper and lower limit should be set pointer and is respectively placed on the position other than upper and lower limit by degree meter.
3. a kind of modification method of electric conduction thermometer deviation according to claim 1, which is characterized in that in step S4
The reading value should estimate the 1/10 of scale division value.
4. a kind of modification method of electric conduction thermometer deviation according to claim 1, which is characterized in that in step S4
In the reading process, thermostat temperature should be kept to stablize, when thermostat temperature is no more than 300 DEG C, thermostat temperature
Variation should not exceed 0.1 DEG C, and when thermostat temperature is more than 300 DEG C, thermostat temperature change should not exceed 0.5 DEG C.
5. a kind of modification method of electric conduction thermometer deviation according to claim 1, which is characterized in that in step S4
In the reading process, thermostat temperature departure test point temperature, electric contact type pressure thermometer must not exceed ± 0.5 DEG C,
Electric contact type bimetallic thermometer must not exceed ± 2.0 DEG C, be subject to standard thermometer.
6. a kind of modification method of electric conduction thermometer deviation according to claim 1, which is characterized in that in step S5
The deviation of the dut temperature meter must not exceed the class of accuracy of range multiplied by ± 1% times.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237574A (en) * | 2021-05-08 | 2021-08-10 | 中国计量科学研究院 | Measuring method for eliminating non-uniqueness influence of thermometer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203455110U (en) * | 2013-09-18 | 2014-02-26 | 国家电网公司 | Thermometer electric contact detection apparatus |
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2019
- 2019-09-05 CN CN201910845396.2A patent/CN110487446A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203455110U (en) * | 2013-09-18 | 2014-02-26 | 国家电网公司 | Thermometer electric contact detection apparatus |
Non-Patent Citations (2)
| Title |
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| 国家质量监督检验检疫总局发布: "双金属温度计", 《CNKI 标准库》 * |
| 魏寿芳: "《膨胀式温度计》", 30 November 2008 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237574A (en) * | 2021-05-08 | 2021-08-10 | 中国计量科学研究院 | Measuring method for eliminating non-uniqueness influence of thermometer |
| CN113237574B (en) * | 2021-05-08 | 2022-03-08 | 中国计量科学研究院 | Non-uniqueness evaluation method of thermometer |
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Application publication date: 20191122 |
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