Abstract：Applying the fixed point transfer technology to on-site temperature calibration has become an important way to improve the industrial temperature measurement level. A miniature dual temperature fixed point for field calibration was developed. The fixed point adopted a porous graphite crucible and a semi-enclosed structure filled with two metals, indium and tin. Experimental results showed, at indium point, the temperature plateau curve lasted about 2 hours, and at tin point, the temperature plateau curve lasted about 3 hours. The extended uncertainty reproduced in temperature plateau curve of In was 4.0mK (k=2), and Sn was 4.4mK (k=2). Therefore, the miniature double temperature fixed point device could meet the calibration requirements of precision platinum resistance thermometers in industrial field.
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2021, Vol. 42 
