高露点湿度标准装置的研制

Development of High Dew Point Humidity Standard Generator

目前我国湿度计量基准中露点温度溯源的最高上限为80℃,为满足更高露点温度下的湿度参数溯源需求,研制了一套基于双温双压法原理的高露点湿度标准装置。该装置由恒温系统、预饱和系统、饱和系统、测量室和温度、压力测量与控制系统等部分组成,能够产生的露点温度范围为80~150℃,对应测量室的温度范围为80~200℃,绝对压力范围为0~1 MPa,扩展不确定度为0.34~0.80℃(k=2)。该装置准确性好、操作方便,弥补了国内在露点温度高于100℃时,温度计校准的不足。

At present,the maximum upper limit of dew point temperature traceability in China’s humidity measurement is 80℃.In order to meet the demand of humidity parameter traceability at higher dew point temperature,a high dew point humidity standard device set based on the principle of double temperature and double pressure method is developed.The device consists of the constant temperature system,pre-saturation system,saturation system,measuring chamber and temperature,pressure measurement and control system.It can produce the dew point temperature of 80~150℃,the corresponding measuring temperature range is 80~200℃,the absolute pressure range is 0~1 MPa,and the expanded uncertainty is 0.34~0.80℃(k=2).The device has good accuracy,convenience to operate and important technical application value.