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氧化铝湿度计测定气体中水份是一个相对方法,需用标准方法进行校准.我们拟制了动态校准法.该方法解决了零点气体的获得;湿度的连续变化;湿度的绝对测量三个问题.本校准装置的校准范围为0.001～100PPmvH_2O(相当于-110℃～-20℃露点).调校后的校准曲线是一条近于45°的直线.经校准的氧化铝湿度计与多种测湿器进行对照测定,所得结果一致.这表明动态校准法和氧化铝湿度计的测定结果都是准确可靠的.对校准过程中应注意的问题进行了讨论.由误差分析估计出动态校准法的准确度可控制在±2℃露点以内.这与目前国外同类仪器的准确度基本相同.
Alumina hygrometer is a relative method to determine the moisture content of gas, which needs to be calibrated by standard methods. We have prepared a dynamic calibration method that solves the three problems of zero gas acquisition, continuous humidity change and absolute humidity measurement The calibration range of the calibration device is 0.001 ~ 100PPmvH_2O (equivalent to -110 ℃ ~ -20 ℃ dew point) .The calibration curve after calibration is a straight line near 45 ° .The calibrated alumina hygrometer with a variety of measurements Humidifier control, the results are consistent, which shows that both the dynamic calibration method and the alumina hygrometer measurement results are accurate and reliable. The calibration process should be noted that the issue was discussed by the error analysis to estimate the dynamic calibration method Accuracy can be controlled within ± 2 ℃ dew point, which is similar to the accuracy of similar foreign instruments.