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Title: Long-Term Resistance And Ratio Stability Of Sprts, Comparing Metal Sheaths Vs. Fused Silica Sheaths
Author: Mingjian Zhao, Rick Walker
Source: 2006 Measurement Science Conference
Year Published: 2006
Abstract: An investigation of re-calibration results of metal-sheathed standard platinum resistance thermometer (SPRT) and fused silica-sheathed SPRTs was reported. The performance of metal-sheathed SPRTs could be as good as that of fused-sheathed SPRTs if the user could take care it very well. However, in fact, the long-term stability of metal-sheathed SPRTs is generally worse than that of fusesilica sheathed SPRTs due to the users carelessness. The investigation results were discussed based on possible effects due to the sensor contamination, platinum oxidation, and mechnical shock, etc. To reduce calibration uncertainty and improve calibration reliability, two simple methods are introduced.

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