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2. Resistance thermometer - Wikipedia

   en.wikipedia.org/wiki/Resistance_thermometer

   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]

3. International Temperature Scale of 1990 - Wikipedia

   en.wikipedia.org/wiki/International_Temperature...

   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 ...

4. Platinum - Wikipedia

   en.wikipedia.org/wiki/Platinum

   The Standard Platinum Resistance Thermometer (SPRT) is one of the four types of thermometers used to define the International Temperature Scale of 1990 (ITS-90), the international calibration standard for temperature measurements. The resistance wire in the thermometer is made of pure platinum (NIST manufactured the wires from platinum bar ...

5. Callendar–Van Dusen equation - Wikipedia

   en.wikipedia.org/wiki/Callendar–Van_Dusen_equation

   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.

6. Scale of temperature - Wikipedia

   en.wikipedia.org/wiki/Scale_of_temperature

   Many different thermometer designs are required to cover the entire range. These include helium vapor pressure thermometers, helium gas thermometers, standard platinum resistance thermometers (known as SPRTs, PRTs or Platinum RTDs) and monochromatic radiation thermometers.

7. List of IEC standards - Wikipedia

   en.wikipedia.org/wiki/List_of_IEC_standards

   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 ...