A new type of platinum: platinum-rhodium thermocouple wire which incorporates traces of yttrium in the platinum limb has been developed and tested in some typical working environments. This thermocouple possesses good thermal stability and mechanical strength at high temperatures, and a long service life, compared with conventional platinum:platinum-rhodium thermocouples. The thermocouple meets the output requirements of the Type S standard for thermocouples - those made ofPt:Pt-10%Rh — whose manufacturing tolerances are prescribed by the International Electrotechnical Commission (I.E.C.) (1). The life of thermocouples made from this wire is increased by around 1.5 to 2 times and they display a greater resistance to contamination.
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