Patent ID: 8247040

Claim:
A process for manufacturing a platinum temperature-measuring resistance element configured by sealing with a sealing material a thermosensitive part composed of platinum resistance wire or platinum resistance film, comprising the steps of: raising a temperature of an unsealed thermosensitive part composed of platinum resistance wire or platinum resistance film inside a furnace; purging the furnace with inert gas containing oxygen to a temperature region in which the platinum is in reduced form at a partial pressure of oxygen in an applicable purge gas as determined from platinum oxide formation free energy; substituting the purge gas in the furnace with inert gas in which oxygen is 1 kPa or less; and sealing the thermosensitive part in the inert gas, wherein the thermosensitive part can be stably used to the temperature region of the reduced form of platinum in which the partial pressure of the oxygen is 1 kPa or less as determined by the platinum oxide formation free energy, and wherein an oxygen partial pressure of the purge gas is the partial pressure at room temperature.