<P> Type R (87% Pt / 13% Rh--Pt, by weight) thermocouples are used up to 1600 ° C . </P> <P> Type S (90% Pt / 10% Rh--Pt, by weight) thermocouples, similar to type R, are used up to 1600 ° C. Before the introduction of the International Temperature Scale of 1990 (ITS - 90), precision type - S thermocouples were used as the practical standard thermometers for the range of 630 ° C to 1064 ° C, based on an interpolation between the freezing points of antimony, silver, and gold . Starting with ITS - 90, platinum resistance thermometers have taken over this range as standard thermometers . </P> <P> These thermocouples are well suited for measuring extremely high temperatures . Typical uses are hydrogen and inert atmospheres, as well as vacuum furnaces . They are not used in oxidizing environments at high temperatures because of embrittlement . A typical range is 0 to 2315 ° C, which can be extended to 2760 ° C in inert atmosphere and to 3000 ° C for brief measurements . </P> <P> (95% W / 5% Re--74% W / 26% Re, by weight) </P>

What is the maximum temperature can be measured using platinum tungsten thermometer