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Platinum was proposed by Sir William Siemens as an element for a resistance temperature detector at the Bakerian lecture in 1871: [2] it is a noble metal and has the most stable resistance–temperature relationship over the largest temperature range.
The Callendar–Van Dusen equation is an equation that describes the relationship between resistance (R) and temperature (T) of platinum resistance thermometers (RTD). As commonly used for commercial applications of RTD thermometers, the relationship between resistance and temperature is given by the following equations.
Werner von Siemens was the first to propose the use of a platinum resistance temperature detector in 1860, although his instrument readings were unstable. [2] Callendar developed an equation for the resistance of metal as a function of temperature, which was accurate to within 1% from 0-600 °C. [2]
These include helium vapor pressure thermometers, helium gas thermometers, standard platinum resistance thermometers (known as SPRTs) and monochromatic radiation thermometers. Although the Kelvin and Celsius temperature scales were (until 2019) defined using the triple point of water ( 273.16 K or 0.01 °C ), it is impractical to use this ...
This page was last edited on 8 September 2006, at 21:07 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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1871 — William Siemens describes the Resistance thermometer at the Bakerian Lecture; 1874 — Herbert McLeod invents the McLeod gauge; 1885 — Calender-Van Duesen invented the platinum resistance temperature device; 1887 — Richard Assmann invents the psychrometer (Wet and Dry Bulb Thermometers)