New Generation of Fixed Points

摘要

A new generation of fixed points, mainly for calibration of secondary reference thermometers, reference thermocouples and industrial temperature probes, has been developed. Primary fixed points (PFPs), designed for realization of the ITS (International Temperature Scale), are unsuitable for the secondary level and industrial calibration because of their poor productivity, deep immersion-depth requirement and complexity. The new generation of fixed points requires an immersion of only 230 mm, adequate for most secondary reference and industrial temperature probes. They provide high efficiency; a great number of probes can be calibrated in a working day. The realization of the new generation of fixed points and the cell design is described. The comparison data between the new fixed points and PFPs are provided.