Development of a 300 L Calibration Bath for Oceanographic Thermometers

作者：Baba S^*; Yamazawa K; Nakano T; Saito I; Tamba J; Wakimoto T; Katoh K

来源：International Journal of Thermophysics, 2017, 38(11): 164.

DOI：10.1007/s10765-017-2298-3

• Calibration bath
• Comparison calibration
• Stability
• Uncertainty
• Uniformity
• Water temperature

The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has been developing a 300 L calibration bath to calibrate 24 oceanographic thermometers (OT) simultaneously and thereby reduce the calibration work load necessary to service more than 180 OT every year. This study investigated characteristics of the developed 300 L calibration bath using a SBE 3plus thermometer produced by an OT manufacturer. We also used 11 thermistor thermometers that were calibrated to be traceable to the international temperature scale of 1990 (ITS-90) within 1 mK of standard uncertainty through collaboration of JAMSTEC and NMIJ/AIST. Results show that the time stability of temperature of the developed bath was within +/- 1 mK. Furthermore, the temperature uniformity was +/- 1.3 mK. The expanded uncertainty (k = 2) components for the characteristics of the developed 300 L calibration bath were estimated as 2.9 mK, which is much less than the value of 10 mK: the required specification for uncertainty of calibration for the OT. These results demonstrated the utility of this 300 L calibration bath as a device for use with a new calibration system.

• 出版日期2017-11