Effect of Pressure on the emf of Chromel-Alumel and Platinum-Platinum 10% Rhodium Thermocouples

Abstract
A differential technique has been used to measure the absolute effect of pressure on the emf of Chromel‐Alumel and Pt‐Pt10Rh thermocouples. The experiments were conducted in a solid pressure medium piston‐cylinder apparatus to 35 kbar and 1000°C. Extrapolation of these data shows Chromel‐Alumel to read as much as 28°C high at 50 kbar and 1200°C and Pt‐Pt10Rh as much as 28°C low at 50 kbar and 2000°C. Graphs are presented which show correction voltage versus temperature for various pressures.