Callendar-Van Dusen equation
Encyclopedia
The Callendar–Van Dusen equation is an equation that describes the relationship between resistance (R) and temperature (t) of platinum
resistance thermometers.
It is also used in the international standard DIN EN 60 751 (IEC751). For a more accurate relationship, the ITS-90 is used.
For the range between -200 °C to 0 °C the equation is
For the range between 0 °C to 661 °C the equation is
These equations are listed as the basis for the temperature/resistance tables for platinum resistance thermometers and are not intended to be used for the calibration of individual thermometers.
The coefficients for individual thermometers (
and 
) can be obtained by calibration.
The equation was found by British physicist Hugh Longbourne Callendar
, and refined by M. S. Van Dusen.
Platinum
Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived from the Spanish term platina del Pinto, which is literally translated into "little silver of the Pinto River." It is a dense, malleable, ductile, precious, gray-white transition metal...
resistance thermometers.
It is also used in the international standard DIN EN 60 751 (IEC751). For a more accurate relationship, the ITS-90 is used.
For the range between -200 °C to 0 °C the equation is
For the range between 0 °C to 661 °C the equation is
These equations are listed as the basis for the temperature/resistance tables for platinum resistance thermometers and are not intended to be used for the calibration of individual thermometers.
The coefficients for individual thermometers (
and ) can be obtained by calibration.The equation was found by British physicist Hugh Longbourne Callendar
Hugh Longbourne Callendar
Hugh Longbourne Callendar FRS was a British physicist. He was born at Hatherop as the eldest son of the Reverend Hugh Callendar, a local Anglican rector...
, and refined by M. S. Van Dusen.