What question did this study set out to answer?

To measure the influence of high pressure on the thermal electromotive force (emf) of various pure metals and alloys, and to determine error corrections for common thermocouple pairs.

March 1, 1961Journal of Applied Physics

Effect of Pressure on emf of Thermocouples

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FBF. P. BundyThe Nature Conservancy

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Implication

Experimental study demonstrates pressure-dependent deviations in thermocouple electromotive force up to 72 kbar and 1200°C, highlighting necessary calibration corrections.

Key Points

To measure the influence of high pressure on the thermal electromotive force (emf) of various pure metals and alloys, and to determine error corrections for common thermocouple pairs.
Measured pressure thermal emfs for constantan, Pt, Ni, alumel, Pt-10% Rh, Cu, chromel, and Ni-18% Mo under a temperature difference of 100°C over 0 to 72 kbar.
Evaluated and compared common thermocouple pairs at temperatures up to 1200°C under pressures reaching 58 kbar.
Below 200°C to 300°C, thermocouple deviations align closely with absolute single-metal data recorded at a 100°C gradient.
At higher temperatures, deviations diminish and generally reverse sign, conforming to a quadratic relation δT = A(P)ΔT + B(P)ΔT².
The parameter B(P) is generally opposite in sign to A(P) and sufficiently large to dominate the linear term at higher temperature intervals.

Cite This Study

F. P. Bundy (1961) studied this question.

synapsesocial.com/papers/6a1653dfb11859caecb8e358 https://doi.org/10.1063/1.1736029

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Implication

Experimental study demonstrates pressure-dependent deviations in thermocouple electromotive force up to 72 kbar and 1200°C, highlighting necessary calibration corrections.

Effect of Pressure on emf of Thermocouples

Discussion

Member takes

Implication

Key Points

Cite This Study

Effect of Pressure on emf of Thermocouples

Discussion

Member takes

Implication

Key Points

Cite This Study

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