Temperature and resistance value conversion method for industrial platinum resistor within 30-73K

Abstract

The invention discloses a temperature and resistance value conversion method for an industrial platinum resistor within 30-73K. The method is used for solving the problems that in the prior art, the temperature measurement error of the industrial platinum resistor below 73K is large, and the measurement requirement of higher precision is difficult to meet. The method comprises the following stepsof: measuring the corresponding relationship between the temperature and the resistance value of the industrial platinum resistor by combining a four-lead method and a thermal resistance elimination method; according to the acquired data, fitting to obtain a corresponding formula of the industrial platinum resistor and the temperature value under the temperature zone of 30K to 73K; writing a formula into the acquisition module through computer programming; and using the acquisition module is for realizing temperature measurement in a 30-73K temperature zone range. According to the temperatureacquisition method in the range of 30K to 73K provided by the invention, accurate measurement in a temperature zone can be realized, the measurement error is in the range of 1K, the sensor cost in thefield of low-temperature measurement is greatly reduced, and most of test requirements in low-temperature test can be met.

Description

Technical field[0001]The invention relates to the technical field of temperature measurement of industrial platinum resistors, in particular to a temperature and resistance value conversion method for industrial platinum resistors within 30 to 73K.Background technique[0002]The degree of cold and heat of an object is usually expressed by the physical quantity "temperature", and the temperature needs to be measured with the help of a certain special effect of a certain substance with a certain law of temperature. Because the resistance of platinum metal is relatively sensitive to temperature, it is widely used as a thermal element in industrial temperature measurement. The current platinum resistance technology and verification procedures are mainly based on IEC60751-2008. According to the standard, the lowest measurement temperature of the current platinum resistance is 73K, and accurate measurement at lower temperatures cannot use the fitting formula in the standard for temperature ...

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem in the prior art that the temperature measurement error of industrial platinum resistors below 73K is relatively large, and it is difficult to meet the measurement requirements of higher precision, and propose a temperature and temperature sensor suitable for industrial platinum resistors within 30K to 73K. Resistance value conversion method

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