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The ice point is designated as a secondary standard because its accuracy is ±0.005 °C (±0.009 °F), compared to ±0.001 °C (±0.0018 °F) for primary fixed points. Comparison calibrations is commonly used with secondary standard platinum resistance thermometers and industrial RTDs. [4]
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 ...
The standard even compensates for the pressure effect due to how deeply the temperature probe is immersed into the sample. ITS–90 also draws a distinction between "freezing" and "melting" points. The distinction depends on whether heat is going into (melting) or out of (freezing) the sample when the measurement is made.
Resistance thermometer principle: relation between temperature and electrical resistance of metals (platinum) (electrical resistance), range: 10 to 1,000 kelvins, application in physics and industry; Solid thermometer principle: relation between temperature and length of a solid (coefficient of thermal expansion). Bimetallic strip
The production of modern platinum thermometers were based on Callendar’s model with the accuracy continually improved on, such as more purified platinum and making them smaller. [11] His work on the platinum resistance thermometer gave way for the development of the rolling-chart thermometer, which permits the measurement of climatic ...
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.
IEC 60751 Industrial platinum resistance thermometers and platinum temperature sensors; IEC 60754 Test on gases evolved during combustion of materials from cables; IEC TR 60755 General requirements for residual current operated protective devices; IEC 60756 Non-broadcast video tape recorders – Time base stability; IEC 60757 Code for ...
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