近年来随着国内科学技术和工业生产的不断发展,应用低温条件的实验室和工业部门日益增多,对于测量低温用的热电偶材料性能要求准确可靠,特别是对0～-200℃这段温度范围的要求更为迫切. 由纯铜导线和康铜热偶丝制成的铜-康铜热电偶经常用在0～-200℃温度范围内;有时还可在液 In recent years, with the continuous development of domestic science and technology and industrial production, the laboratory and industrial departments applying low-temperature conditions are increasing day by day, and the performance requirements of the thermocouple materials for measuring low temperature are accurately and reliably required, especially for the temperature of 0 to 200 ° C. The scope of the more urgent requirements by the pure copper wire and copper wire made of constantan copper - Constantan thermocouple often used in the temperature range of 0 ~ -200 ℃; sometimes in the liquid