Study on In-situ Calibration of Precision Platinum Resistance Thermometer Based on Micro Gallium Fixed-point
WANG Bo-yang1,ZENG Fan-chao2,FU Cheng-yu2,HUANG An-yi1,SUN Jian-ping3
1. School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China
2. Hubei Instiute of Measurement and Testing, Wuhan, Hubei 430223, China
3. National Institute of Metrology, Beijing 100029, China
Abstract Based on the transfer technology of fixed-point temperature scale, a precision platinum resistance thermometer which can be calibrated in-situ at the melting point of gallium was designed and the characteristics of the micro fixed-point phase change temperature level were analyzed experimentally. The experimental results show that the maximum duration of the fixed temperature plateau is 1.2h, the stability of the plateau is better than 2.8mK and the reusability is better than 2.3mK within 20min. There is a linear relationship between the micro fixed-point temperature level and the heating temperature, and as the heating temperature increases, the temperature plateau value of the fixed-point increases, and the fixed-point temperature level at different heating temperatures can be calculated by fitting formula.
WANG Bo-yang,ZENG Fan-chao,FU Cheng-yu, et al. Study on In-situ Calibration of Precision Platinum Resistance Thermometer Based on Micro Gallium Fixed-point[J]. Acta Metrologica Sinica, 2022, 43(2): 210-214.
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2022, Vol. 43 
