산업용 저항 온도계의 저온 자동 비교 교정 시스템 개발
Development of the automatic calibration system for industrialresistance thermometers at low temperatures
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초록
A system is designed and fabricated for the automatic low temperature calibration by comparison of industrial resistance thermometers. The cryostat is suitable for the calibration of four capsule type thermometers and four long stem thermometers. By the automatic temperature control of the cryostat, we could calibrate thermometers from −. 200 oC to 0 oC for ~ 15 hours by one fill of liquid nitrogen in the test run of the system. The uncertainty of the calibration forindustrial platinum resistance thermometers using the automatic system is about 30 mK with a 95 % confidence interval.
Abstract
A system is designed and fabricated for the automatic low temperature calibration by comparison of industrial resistance thermometers. The cryostat is suitable for the calibration of four capsule type thermometers and four long stem thermometers. By the automatic temperature control of the cryostat, we could calibrate thermometers from −. 200 oC to 0 oC for ~ 15 hours by one fill of liquid nitrogen in the test run of the system. The uncertainty of the calibration forindustrial platinum resistance thermometers using the automatic system is about 30 mK with a 95 % confidence interval.
참고문헌 (6)
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- B.W. Mangum, "On the international temperature scale of 1990 (ITS-90)", Metrologia, 34(5), pp.427~429 (1997)
- J. Ancsin, "Calibration apparatus for long-stem and capsule-type Pt resistance thermometers between the triple points of Ar and In", Rev. Sci. Instr, 55(8), pp.1321~1314 (1984)
- 강기훈, "캡슐형 백금저항온도계 국 제비교를 위한 네온, 산소, 아르곤, 수은 및 물의 삼 중점 실현", 센서학회지, 9(3), pp.153~162 (2000)
- 양인석, "초정밀 온도센서의 저온 영역 교정 장치 개발", 센서학회지, 17(3), pp.188~194 (2008), 한국센서학회