计量学报2025，Vol.46Issue(3)：340-346,7.DOI:10.3969/j.issn.1000-1158.2025.03.05
非标短型无补偿导线铱铑热电偶的校准方法研究
Research on the Calibration Method of Non-standard Short Uncompensated Wire Iridium-rhodium Thermocouple
摘要
Abstract
Non-standardized short thermocouples(80～150 mm)without compensating wires usually have significant deviations during measurement or calibration due to their short length and the incapability of extending the cold junction.A short iridium-rhodium thermocouple was taken as an example,calibratesd using a dry body-furnace and a thermal equalization block device.Three different cold-junction treatments methods were adopted:air cooling,using a circulating water-cooled plate,and immersion water cooling.All of these were corrected with K-type thermocouples.The thermoelectric potential-temperature relationship of a long iridium-rhodium thermocouple from the same source was taken as a reference for the short thermocouple.It was found that the deviation of the reference values from the national standard was over 1%,and the differences in the calibration results at the In,Sn,and Zn fixed points were 0.23,0.32,and 0.48 ℃,respectively.The experimental results show that the calibration error of the short iridium rhodium couple using a circulating water-cooled plate to control the cold junction and temperature correction method within the temperature range of 0～500℃is better than 1%,with an uncertainty of 0.9～3.2℃.关键词
温度计量/短型铱铑热电偶/校准/干体炉/分度曲线Key words
temperature measurement/short-type iridium-rhodium thermocouple/calibration/dry-well furnace/calibration curve引用本文复制引用
李可,张婷婷,李竟怡,许淑惠,卢小丰..非标短型无补偿导线铱铑热电偶的校准方法研究[J].计量学报,2025,46(3):340-346,7.基金项目
国家重点研发计划(2023YFF0615003) （2023YFF0615003）
国家科技重大专项(J2019-V-0015-0110) （J2019-V-0015-0110）
