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Platinum-resistance thermometer. Add languages. Add links. Article; ... Print/export Download as PDF; Printable version;
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.
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.
Callendar was the first to design and build an accurate platinum resistance thermometer suitable for use, which allowed scientists and engineers to obtain consistent and accurate results. [1] He conducted experiments and researched thermodynamics, producing and publishing reliable tables on the thermodynamic properties of steam used for ...
Platinum resistance thermometer. 4 languages. ... Print/export Download as PDF; Printable version; In other projects
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 ...
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)
The resistance wire in the thermometer is made of pure platinum (NIST manufactured the wires from platinum bar stock with a chemical purity of 99.999% by weight). [77] [78] In addition to laboratory uses, Platinum Resistance Thermometry (PRT) also has many industrial applications, industrial standards include ASTM E1137 and IEC 60751.