Pressure Dependence of the emf of Thermocouples

Abstract

Possible factors contributing to relative and absolute emf corrections for thermocouples due to the effect of high pressure are evaluated in the present paper. These factors include contamination, plastic deformation, electrical shunting, and pressure and temperature gradients. The relative correction data from different experiments and different types of cells are compared. A method for obtaining the proper absolute corrections for Pt/Pt10Rh and Chromel-Alumel thermocouples for any type of high-pressure cell is presented.