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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.
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 ...
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.
A thermistor IS a resistance thermometer. Moreover, there are more thermistors produced and used commercially than either PRTs or thermocouples. Perhaps the article should be renamed as "Platinum resistance thermometer", especially as other RTD types (most notable is nickel) are also omitted. 71.228.106.24 19:59, 11 July 2010 (UTC)
The Steinhart–Hart equation is a model relating the varying electrical resistance of a semiconductor to its varying temperatures. The equation is = + + (), where is the temperature (in kelvins), is the resistance at (in ohms),
A thermistor is a semiconductor type of resistor in which the resistance is strongly dependent on temperature. The word thermistor is a portmanteau of thermal and resistor.The varying resistance with temperature allows these devices to be used as temperature sensors, or to control current as a function of temperature.
Vapor pressure–temperature relationship fixed by a specified function. [10] 3 24.5561 1 Helium gas thermometer: Calibrated at three fixed points in this range and interpolated in a specified way. [11] 13.8033 1234.93 11 Platinum resistance thermometer: Resistance calibrated at various fixed points and interpolated in a specified way.
A Beckmann thermometer is a device used to measure small differences of temperature, but not absolute temperature values. It was invented by Ernst Otto Beckmann (1853 – 1923), a German chemist, for his measurements of colligative properties in 1905. [1] Today its use has largely been superseded by platinum PT100 resistance thermometers and ...