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SPRTs commonly use reference-grade, high-purity smaller-diameter platinum wire, metal sheaths and ceramic type insulators. Internal lead wires are usually a nickel-based alloy. Standard PRTs are more limited in temperature range (−200 °C to 500 °C) and are approximately accurate to ±0.03 °C over the temperature range.
The thermometer measured temperatures with accuracy from -190 °C to 660 °C. His results were praised by J.J Thomson for providing a new tool that “could determine temperatures with an ease and accuracy never obtainable before”. [6] Callendar improved the heat range of his platinum thermometer from -200 °C up to 1000 °C.
As commonly used for commercial applications of RTD thermometers, the relationship between resistance and temperature is given by the following equations. The relationship above 0 °C (up to the melting point of aluminum ~ 660 °C) is a simplification of the equation that holds over a broader range down to -200 °C.
Boca Raton, Florida, 2003; Section 6, Fluid Properties; Critical Constants. Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for Tc and Pc is indicated by the number of
(room temperature) (alpha, polycrystalline) calculated 562 nΩm ... high 35 Br bromine; use 7.8×10 10 Ωm ... 78 Pt platinum; use 19.22 nΩm 96 nΩm 105 nΩm
They are less suitable for applications where smaller temperature differences need to be measured with high accuracy, for example the range 0–100 °C with 0.1 °C accuracy. For such applications thermistors , silicon bandgap temperature sensors and resistance thermometers are more suitable.
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An operating temperature is the allowable temperature range of the local ambient environment at which an electrical or mechanical device operates. The device will operate effectively within a specified temperature range which varies based on the device function and application context, and ranges from the minimum operating temperature to the maximum operating temperature (or peak operating ...