二级校准用温度固定点

Fixed Points for Secondary Level Calibrations

近年来出现了一种新的温度固定点校准技术。这种新技术不同于经典的固定点技术，所用设备简单，操作方便，工作效率高，主要适用于二级和工业温度计的校准。本文简要介绍了若干应用例子：一种不需用液氮或干冻冻制及杜瓦瓶保存的复现水三相点的新方法，自动金属固定点装置和不锈饮固定点容器及其复现装置等。

A new temperature calibration technique using fixed points is appearing in recent years. This new kind of fixed points, mainly for secondary level and industrial calibration, is different from the traditional fixed points. The equipments for the new fixed points are very simple and easy of use. The new mehtods provide excellent efficiency. Several examples are described in the paper, including a new way of realization of the triple point of water without using dry ice or liquid nitrogen to freeze the ice mantle and Dewar vessel to maintain three phase equilibrium, an automatic apparatus for the realization of metal freezing points, and stainless steel cased fixed point cells and their maintenance apparatus.