HU Yanqing1,Meng Su1,CHAI Yuan1,CHEN Jiexin1, LÜ Guoyi1,NIE Jing2
1. Beijing Chang-cheng Institute of Metrology and Measurement, Beijing 100095, China
2. School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
Abstract：A novel ultra-low frost point generator (CIMM-TH) has been developed by using the two-temperature and two-pressure method in the frost point temperature range from -110℃ to -20℃. The core components of the saturator and thermostat were optimized, and the saturation efficiency of the saturator was verified by using two modes of “evaporation” and “condensation”. Under different saturation temperature and pressure conditions, a cold mirror precision dew-point meter and a micro-moisture meter were used to compare with the generator. The test results show that when the frost point temperature is -90℃, the deviation between the dew-point meter and the generator is 0.02℃. When the saturation pressure is 1MPa and the saturation temperature is -99.60℃, the deviation of frost point temperature between the micro moisture meter and the generator is 0.04℃. The uncertainty factors affecting the measurement results of the generator are analyzed systematically. The expanded uncertainty of the generator is 0.38℃, 0.20℃ and 0.19℃ at the frost point of -110℃, -90℃ and -20℃, respectively, k=2.
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2024, Vol. 45 
