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감기술,박종철,장충근 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
In the ITS-90 the range of a high-temperature platinum resistance thermometer(HTPRT) restricted to the freezing-point of silver(961.78 ℃). To extend the usable temperature range of a HTPRT, synthetic sapphire single crystal was used as insulation materials. The sensing element consisted of a single-layer bifilar platinum winding on a notched blade of x-shaped sapphire rod. The platinum wire used as sensing coil was 99.9999 % wt.% pure with 0.5 mm in diameter. Two pieces of HTPRT have the nominal resistance of 0.14 Ω at the triple point of water. HTPRTs were calibrated at the freezing points of Cu, Ag, Al, Zn, Sn and the melting point of Ga and the triple point of water and compared with the calibrated type S thermocouple from 500 ℃ to 1500 ℃. All measured values at fixed points nearly satisfied with the ITS-90 criteria, and the temperature-resistance characteristics of HTPRTs were proportional to temperature increases in the range of 0 ℃ to 1500 ℃. The insulation resistances at 700 ℃ was 1035 MΩ and decreased to 63 kΩ at 1500 ℃ exponentially.
장충근,박종철,감기술 한국센서학회 2001 센서학회지 Vol.10 No.1
High temperature platinum resistance thermometers(HTPRTs) were designed and fabricated using a synthetic sapphire single crystal as sensor former, insulation and protection tube, and its characteristics was investigated. Several fixed points measurement showed that the sapphire HTPRTs were satisfied with the ITS-90 criteria as the interpolating thermometer. The temperature-resistance characteristics of HTPRT was fitted to the quadratic relationship in the temperature range from 500℃ to 1500℃. The reproducibility of Cu freezing point realized using the sapphire HTPRT was ± 19.2 mK. The insulation resistance of the HTPRT exponentially decreased as temperature increased, and showed to 63 ㏀( 31.5 mK) at 1500℃.