Effect of Pressure on Deep-Ocean Thermometers

Int. J. Thermophys. (2017) 38:163, DOI 10.1007/s10765-017-2297-4
A. Peruzzi, S. Ober and R. Bosma.

Abstract
A laboratory experiment was devised and performed to investigate the pressure dependence of Sea-Bird Electronics SBE35 and SBE3 deep-ocean thermometers. The thermometers were mounted in a massive brass comparator together with a calibrated standard platinum resistance thermometer. The measurements were performed in a pressure chamber in the pressure range 0.1 MPa to 60 MPa. The results showed that both the investigated SBE35 and SBE3 thermometers are pressure dependent, with a pressure sensitivity of +41 μμK⋅⋅MPa−1−1 and −77−77 μμK⋅⋅MPa−1−1, respectively. Nevertheless, the results obtained in only one individual device per model (one SBE35 and one SBE3) cannot be generalized and further investigations of a larger number of devices per model are needed.

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