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铜—康铜热电偶是一种工艺稳定、热电性能良好的廉金属热电偶,在-200℃～+300℃范围内是很好的温度测量元件。目前,各铜—康铜热电偶生产厂在出厂检定时,除测量正温区的热电势之外,有的还测量液氮及干冰点的电势。在分度或检定低温铜—康铜热电偶时,一般要测量液氮(-196℃)、干冰(-79℃)以及-40℃三个温度点的热电势。鉴于低温试验的麻烦、不经济和计算复杂,本文试图用铜—康铜热电偶在水沸点(+100℃)的热电势数值,计算出0～-200℃之间每隔10℃的铜—康铜热电偶的热电势或者
Copper - Constantan thermocouple is a stable process, good thermoelectric performance of low-metal thermocouple, in the range of -200 ℃ ~ +300 ℃ is a good temperature measurement components. At present, each copper - Hong Tong thermocouple factory in the factory test, in addition to measuring the positive temperature of the thermoelectric power, and some also measure the potential of liquid nitrogen and dry ice point. When indexing or verifying low-temperature copper-constantan thermocouples, thermopots of liquid nitrogen (-196 ° C), dry ice (-79 ° C) and -40 ° C are generally measured. In view of the cumbersome, uneconomical and computational complexity of the low-temperature test, this paper attempts to calculate the copper-nickel content of every 10 ° C between 0 and -200 ° C using the thermopower values of the copper -contained copper thermocouple at the boiling point of water (+100 ° C) Thermocouple thermocouple potential or