300℃以上热电偶量传体系问题分析及对策

Analysis and Reflection to the Problem of Thermocouple Quantity Transfer System above 300℃

针对目前300℃以上热电偶量传体系存在不确定度过大、计量能力不满足要求等问题,分析了高温共晶点和实用型固定点温度复现、纯金属热电偶温度测量和1500℃以上高温热电偶校准等技术的最新进展,提出基于固定点温度复现方法的新的量值传递体系设想,可大大减小热电偶量值传递的不确定度,使各级计量标准装置不确定度分布更为合理,能保证热电偶量值的逐级量传,满足科研生产对热电偶的溯源要求。

At present, the thermoeouple quantity transfer system above 300℃ has the problems that measurement uncertainties are too large and measurement capability does not satisfy the need. The new quantity transfer system based on fixed point temperature measurement was put forward on the basis of the latest development of high temperature eutectic point and practical fixed point temperature measurement, pure metal thermocouple temperature measurement, and thermocouple calibration technology above 1500℃. The new transfer system can greatly reduce the thermocouple measuring value uncertainty, guarantee the quantity value transfer of each grade normally, and meet thermocouple traceable requirements.