STABILITY STUDY ON A HIGH-TEMPERATURE PLATINUM RESISTANCE THERMOMETER WITH AN ALUMINA INSULATOR

摘要

Two types of HTPRTs, using a new quartz sheath and an alumina sheath, respectively, were developed at AIST. The quartz-sheath HTPRTs showed an excellent stability at the freezing points of aluminium and silver. The alumina-sheath HTPRTs were designed for practical purposes and their stability in horizontal use was tested. The result showed that in horizontal position they were as stable as in vertical position for temperatures up to 800 °C.