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首页> 外文期刊>Review of Scientific Instruments >Development of a quasi-adiabatic calorimeter for the determination of the water vapor pressure curve
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Development of a quasi-adiabatic calorimeter for the determination of the water vapor pressure curve

机译：准绝热量热仪的开发，用于确定水蒸气压力曲线

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Progress in the knowledge of the water saturation curve is required to improve the accuracy of the calibrations in humidity. In order to achieve this objective, the LNE-CETIAT and the LNE-CNAM have jointly built a facility dedicated to the measurement of the saturation vapor pressure and temperature of pure water. The principle is based on a static measurement of the pressure and the temperature of pure water in a closed, temperature-controlled thermostat, conceived like a quasi-adiabatic calorimeter. A copper cell containing pure water is placed inside a temperature-controlled copper shield, which is mounted in a vacuum-tight stainless steel vessel immersed in a thermostated bath. The temperature of the cell is measured with capsule-type standard platinum resistance thermometers, calibrated with uncertainties below the millikelvin. The vapor pressure is measured by calibrated pressure sensors connected to the cell through a pressure tube whose temperature is monitored at several points. The pressure gauges are installed in a thermostatic apparatus ensuring high stability of the pressure measurement and avoiding any condensation in the tubes. Thanks to the employment of several technical solutions, the thermal contribution to the overall uncertainty budget is reduced, and the remaining major part is mainly due to pressure measurements. This paper presents a full description of this facility and the preliminary results obtained for its characterization.
机译：需要提高水饱和度曲线的知识才能提高湿度校准的准确性。为了实现这一目标，LNE-CETIAT和LNE-CNAM共同建立了一个设施，专门用于测量饱和蒸汽压和纯水的温度。该原理基于在封闭的，温度受控的恒温器中对纯水的压力和温度的静态测量，该恒温器的构想类似于绝热量热仪。将装有纯水的铜电池放在温度可控的铜屏蔽罩内，该屏蔽罩安装在浸入恒温浴中的真空密封不锈钢容器中。用胶囊型标准铂电阻温度计测量电池温度，并用低于千分之一毫伏的不确定度校准。蒸汽压力由通过压力管连接到电池的校准压力传感器测量，压力管的温度在多个点进行监控。压力表安装在恒温装置中，以确保压力测量的高度稳定性，并避免管内任何凝结。由于采用了几种技术解决方案，因此减少了对总体不确定性预算的热影响，其余主要部分主要是由于压力测量所致。本文对这种设备进行了全面描述，并对其特性进行了初步研究。

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