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It is important to note that these equations are listed as the basis for the temperature/resistance tables for idealized platinum resistance thermometers and are not intended to be used for the calibration of an individual thermometer, which would require the experimentally determined parameters to
598:
is published by the Comité Consultatif de
Thermométrie and the Comité International des Poids et Mesures. This work provides a 12th order polynomial that is valid over an even broader temperature range that spans from 13.8033 K to 273.16 K and a second 9th order polynomial that is valid over the
41:
As commonly used for commercial applications of RTD thermometers, the relationship between resistance and temperature is given by the following equations. The relationship above 0 °C (up to the melting point of aluminum ~ 660 °C) is a simplification of the equation that holds over a
270:
558:
544:{\displaystyle R(T)=\left\{{\begin{array}{lr}R(0)&{\text{if }}0^{\circ }{\text{C}}\leq T<661^{\circ }{\text{C}}\\R(0)&{\text{if }}-200^{\circ }{\text{C}}<T<0^{\circ }{\text{C}}\end{array}}\right.}
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Where constants A, B, and C are derived from experimentally determined parameters α, β, and δ using resistance measurements made at 0 °C, 100 °C and 260 °C.
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While the simpler form was published earlier by
Callendar, it is generally valid only over the range between 0 °C to 661 °C and is given as:
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Starting in 1968, the
Callendar-Van Dusen Equation was replaced by an interpolating formula given by a 20th order polynomial first published in
572:, and refined for measurements at lower temperatures by M. S. Van Dusen, a chemist at the U.S. National Bureau of Standards (now known as the
615:"Callendar-Van Dusen equations for the calibration of platinum resistance thermometers", WIKA data sheet IN 00.29 ∙ 08/2014,
42:
broader range down to -200 °C. The longer form was published in 1925 (see below) by M.S. Van Dusen and is given as:
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These equations are cited in
International Standards for platinum RTD's resistance versus temperature functions
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is an equation that describes the relationship between resistance (R) and temperature (T) of
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Starting in 1990, the interpolating formula was further refined with the publication of
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Caldus. Callendar-Van Dusen conversion between resistance and temperature in python.
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https://www.wikapolska.pl/upload/DS_IN0029_en_co_59667.pdf
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599:temperature range of 0 °C to 961.78 °C.
587:by the Comité International des Poids et Mesures.
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574:National Institute of Standards and Technology
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568:The equation was found by British physicist
592:The International Temperature Scale of 1990
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252:{\displaystyle R(T)=R(0)(1+A*T+B*T^{2}).}
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578:Journal of the American Chemical Society
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159:{\displaystyle R(T)=R(0).}
570:Hugh Longbourne Callendar
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265:Together,
652:Equations
525:∘
501:∘
493:−
464:−
455:⋅
436:⋅
424:⋅
386:∘
372:≤
362:∘
334:⋅
322:⋅
231:∗
219:∗
138:∗
126:−
104:∗
92:∗
489:if
353:if
33:platinum
594:. The
563:BS-1904
38:(RTD).
596:ITS-90
517:<
511:<
378:<
27:The
497:200
467:100
382:661
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643::
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514:T
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440:T
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421:A
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412:[
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403:(
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310:[
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301:(
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278:(
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228:B
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216:A
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207:(
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198:(
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192:=
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183:(
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80:[
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71:(
68:R
65:=
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59:T
56:(
53:R
20:)
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