微型双温度固定点容器研制

基准固定点传递技术应用于现场温度校准已成为提高工业温度测量水平的一种重要途径。采用多孔石墨坩埚半包围结构,内部对称填充了高纯铟(In)和锡(Sn)2种金属,研制了一种应用于现场校准的微型双温度固定点容器。实验结果表明,In点熔化温坪持续时间约为2 h,Sn点熔化温坪持续时间约为3 h,In和Sn的温坪复现的扩展不确定度分别为4.0 mK 和4.4 mK(k=2),可满足工业现场对精密铂电阻温度计的校准需求。

Development of Miniature Double Temperature Fixed Point Cell

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 4.0mK (k=2), and Sn was 4.4mK (k=2). Therefore, the miniature double temperature fixed point device could meet the calibration requirements of precision platinum resistance thermometers in industrial field.