Development and Evaluation of the Tin Point in the ITS-90

Koichi Sato; Jun Tamba; Isao Kishimoto; Masaru Arai

doi:10.11499/sicep.2002.0.229.0

SICE Annual Conference 2002

DOI https://doi.org/10.11499/sicep.2002.0.229.0

Conference information

Host: The Society of Instrument and Control Engineers

Co-host: IEEE/Industiral Electronic Society, IEEE/Robotics and Automation Society, IEEE/Control System Society

Development and Evaluation of the Tin Point in the ITS-90

Koichi Sato, Jun Tamba, Isao Kishimoto, Masaru Arai

Author information

Keywords: temperature fixed point, freezing point of tin, calibration, repeatability

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 229

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Abstract

The freezing point of tin, one of the temperature fixed-points defined in the ITS-90, is newly developed and evaluated. The temperature stability of the furnace is within ±1.5mK for 24 hours and temperature distribution is within 2mK over 20cm. To realize a stable plateau after a large amount of supercooling, the air blow cooling method is introduced instead of the conventional method. The temperature during the plateaus decreases only 0.3mK for 8 hours and a good repeatability within ±0.026mK is obtained in ten measurements.

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