CN115077745A - Thermal resistance thermometer calibration method based on thermometer - Google Patents
Thermal resistance thermometer calibration method based on thermometer Download PDFInfo
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- CN115077745A CN115077745A CN202210817261.7A CN202210817261A CN115077745A CN 115077745 A CN115077745 A CN 115077745A CN 202210817261 A CN202210817261 A CN 202210817261A CN 115077745 A CN115077745 A CN 115077745A
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- thermometer
- resistance 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
Abstract
A thermal resistance thermometer calibration method based on a thermometer comprises the following steps: 1) electrically connecting a plurality of calibrated resistance thermometers with a plurality of calibration signal input ends of a thermometer with an ITS-90 temperature scale conversion function in a one-to-one correspondence manner respectively; 2) electrically connecting a standard platinum resistance thermometer with a standard signal input end of the thermometer; 3) putting a standard platinum resistance thermometer and a plurality of calibrated resistance thermometers into the same standard thermostatic bath, and adjusting the temperature provided by the standard thermostatic bath to a temperature calibration point; 4) starting a temperature measuring instrument, and setting performance parameters of each resistance thermometer to be calibrated on the temperature measuring instrument; 5) setting performance parameters of a standard platinum resistance thermometer on a thermodetector; 6) reading the standard platinum resistance thermometer and the measured value of each corrected resistance thermometer through a display screen of the thermometer; 7) the difference between the measured values of each of the corrected resistance thermometers and the standard platinum resistance thermometer is calculated as the calibration value of the corrected resistance thermometer.
Description
Technical Field
The invention relates to the technical field of thermal metering, in particular to a thermal resistance thermometer calibration method based on a thermometer.
Background
Thermal resistors (thermistors) are the most commonly used temperature detector in the medium and low temperature region and consist of one or more temperature-sensitive resistive elements, most of which are pure metals such as copper, nickel, iron-nickel, or platinum wires. The measurement accuracy of the platinum thermal resistor is the highest, and the platinum thermal resistor is not only widely applied to industrial temperature measurement, but also made into a standard reference instrument, namely a standard platinum resistance thermometer.
At present, for the calibration of the thermal resistance thermometer, only a digital multimeter or a bridge meeting the measurement accuracy requirement can be used as an electric measuring instrument, the resistance values of the calibrated thermal resistance thermometer and a standard platinum resistance thermometer are respectively read at 0 ℃ and 100 ℃, and the measurement deviation of the calibrated thermal resistance thermometer and the standard platinum resistance thermometer is calculated according to the following steps by comparing the difference of the resistance values of the two:
calculating temperature deviation values of a temperature calibration point of a calibrated resistance thermometer and a standard platinum resistance thermometer
In the formula (I), the compound is shown in the specification,
to measure the resistance of a standard platinum resistance thermometer at the temperature calibration point,
for a standard platinum resistance thermometer resistance value, W, measured at the water triple point t S Is the resistance ratio, dW, of a standard platinum resistance thermometer at a temperature calibration point t S And/dt is the resistance ratio of the standard platinum resistance thermometer at the temperature calibration point and the change rate of the resistance ratio to the temperature, and t is the temperature value of the temperature calibration point.
Secondly, calculating the resistance value R of the calibrated resistance thermometer at a temperature calibration point t '：
In the formula, R i dR/dt is the rate of change of resistance to temperature of the calibrated resistance thermometer at the temperature calibration point.
(3) Calculating the temperature deviation delta t of the corrected resistance thermometer at the calibration point
In the formula, R Is divided into The resistance value corresponding to the temperature calibration point in the temperature chart of the resistance thermometer to be calibrated.
However, the above conventional calibration method has many related parameters, and after the resistance value is tested by the digital multimeter, the calculation needs to be performed manually, so that not only is the work flow complicated, the calibration efficiency low, but also the accuracy of the calibration result cannot be guaranteed, how to quickly and accurately calibrate the resistance value of the thermal resistance thermometer is a difficult problem which is difficult to solve in the field, and a method capable of quickly calibrating the thermal resistance thermometer is urgently needed, so that the problems of complicated flow and low efficiency of the conventional calibration method are solved while the accuracy of the calibration result is guaranteed.
Disclosure of Invention
The invention aims to provide a thermal resistance thermometer calibration method based on a thermometer, aiming at the corresponding defects of the prior art, the invention adopts the thermometer with the ITS-90 temperature scale conversion function to directly read the measurement values of a plurality of calibrated resistance thermometers in batch at one time, and the calibration value of each calibrated resistance thermometer is obtained by comparing the measurement values with the measurement values of a standard platinum resistance thermometer in a standard thermostatic bath.
The purpose of the invention is realized by adopting the following scheme: a thermal resistance thermometer calibration method based on a thermometer comprises the following steps:
1) electrically connecting a plurality of calibrated resistance thermometers with a plurality of calibration signal input ends of a thermometer with an ITS-90 temperature scale conversion function in a one-to-one correspondence manner respectively;
2) electrically connecting a standard platinum resistance thermometer with a standard signal input end of the thermometer;
3) putting a standard platinum resistance thermometer and a plurality of calibrated resistance thermometers into the same standard thermostatic bath, and adjusting the temperature provided by the standard thermostatic bath to a temperature calibration point;
each thermometer should have sufficient insertion depth in a standard thermostatic bath to minimize heat loss.
4) Starting a temperature measuring instrument, and setting performance parameters of each resistance thermometer to be calibrated on the temperature measuring instrument;
5) setting performance parameters of a standard platinum resistance thermometer on a thermodetector;
6) reading the standard platinum resistance thermometers and the measured values of all the corrected resistance thermometers through a display screen of the thermometer;
it is noted that when the measurement value is read, enough time is needed to wait until the measurement value is stable and can be read.
7) The difference between the measured values of each of the corrected resistance thermometers and the standard platinum resistance thermometer is calculated as the calibration value of the corrected resistance thermometer.
Preferably, the performance parameter of the calibrated resistance thermometer is a graduation number.
Preferably, the performance parameters of the standard platinum resistance thermometer include water triple point value
A first deviation function coefficient a, a second deviation function coefficient b, a third deviation function coefficient c, a fourth deviation function coefficient d.
Preferably, the calibrated resistance thermometer is an industrial platinum thermistor thermometer.
The invention has the advantages that the thermometer which can display the output values of the plurality of the corrected resistance thermometers and the standard platinum resistance thermometer as the temperature values is directly adopted for calibration experiments, the complicated manual calculation according to the transmission calibration method is not needed, the one-step calculation is directly carried out through the temperature values displayed by the thermometer, the calculation is simple, the efficiency is high, the calibration values of the plurality of the corrected resistance thermometers can be quickly obtained at one time, the calculation accuracy is greatly improved, and the calibration result meets the standard requirement.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic diagram of the use of the temperature measuring instrument of the present invention.
Detailed Description
As shown in fig. 1 to 2, a thermal resistance thermometer calibration method based on a thermometer includes the following steps:
1) the method comprises the steps of electrically connecting a plurality of calibrated resistance thermometers with a plurality of calibration signal input ends of a thermometer with an ITS-90 temperature scale conversion function in a one-to-one correspondence mode, wherein in the embodiment, the calibrated resistance thermometers are industrial platinum thermal resistance thermometers.
2) Electrically connecting a standard platinum resistance thermometer with a standard signal input end of the thermometer;
3) putting a standard platinum resistance thermometer and a plurality of calibrated resistance thermometers into the same standard thermostatic bath, and adjusting the temperature provided by the standard thermostatic bath to a temperature calibration point;
4) starting a temperature measuring instrument, and setting performance parameters of each resistance thermometer to be calibrated on the temperature measuring instrument;
5) setting performance parameters of a standard platinum resistance thermometer on a thermodetector;
in this embodiment, the performance parameter of the calibrated resistance thermometer is the index number.
The performance parameters of the standard platinum resistance thermometer comprise a water three-phase point value R t * p A first deviation function coefficient a, a second deviation function coefficient b, a third deviation function coefficient c and a fourth deviation function coefficient d.
6) Reading the standard platinum resistance thermometer and the measured value of each corrected resistance thermometer through a display screen of the thermometer;
7) the difference between the measured values of each corrected resistance thermometer and the standard platinum resistance thermometer is calculated as the calibrated value of the corrected resistance thermometer, and the calculation formula is as follows:
Δt＝t quilt -t Sign board
In the formula, t Quilt Measured value, t, of any calibrated resistance thermometer displayed for the thermometer Sign board The measurements of a standard platinum resistance thermometer displayed for the thermometer,Δ t is the calibrated value for the calibrated resistance thermometer.
In this embodiment, the temperature calibration points include 0 ℃ and 100 ℃, the temperature provided by the standard thermostatic bath is first adjusted to 0 ℃, the calibration values of the corrected resistance thermometers at 0 ℃ are calculated according to steps 4) to 7), the temperature provided by the standard thermostatic bath is then adjusted to 100 ℃, and steps 4) to 7) are repeated to calculate the calibration values of the corrected resistance thermometers at 100 ℃.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and modifications of the present invention by those skilled in the art are within the scope of the present invention without departing from the spirit of the present invention.
Claims (4)
1. A thermal resistance thermometer calibration method based on a thermometer is characterized by comprising the following steps:
1) connecting a plurality of calibrated resistance thermometers with a plurality of calibration signal input ends of a thermometer with an ITS-90 temperature scale conversion function in a one-to-one correspondence manner respectively;
2) connecting a standard platinum resistance thermometer with a standard signal input end of the thermometer;
3) putting a standard platinum resistance thermometer and a plurality of calibrated resistance thermometers into the same standard thermostatic bath, and adjusting the temperature provided by the standard thermostatic bath to a temperature calibration point;
4) starting a temperature measuring instrument, and setting performance parameters of each resistance thermometer to be calibrated on the temperature measuring instrument;
5) setting performance parameters of a standard platinum resistance thermometer on a thermodetector;
6) reading the standard platinum resistance thermometer and the measured value of each corrected resistance thermometer through a display screen of the thermometer;
7) the difference between the measured values of each of the corrected resistance thermometers and the standard platinum resistance thermometer is calculated as the calibration value of the corrected resistance thermometer.
2. The thermometer-based thermal resistance thermometer calibration method of claim 1, wherein: the performance parameter of the corrected resistance thermometer is a graduation number.
3. The thermometer-based thermal resistance thermometer calibration method of claim 1, wherein: the performance parameters of the standard platinum resistance thermometer include the water three phase point value
A first deviation function coefficient a, a second deviation function coefficient b, a third deviation function coefficient c, a fourth deviation function coefficient d.
4. The thermometer-based thermal resistance thermometer calibration method of claim 1, wherein: the calibrated resistance thermometer is an industrial platinum thermal resistance thermometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210817261.7A CN115077745A (en) | 2022-07-12 | 2022-07-12 | Thermal resistance thermometer calibration method based on thermometer |
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| CN202210817261.7A CN115077745A (en) | 2022-07-12 | 2022-07-12 | Thermal resistance thermometer calibration method based on thermometer |
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