Callendar-Van.dusen.equation - Crystal nVision Reference Recorder Operation Manual

Platinum RTD sensor element types have the following general feature set:
Temperature
Element
Range
-200ºC to 850ºC
Platinum
(-328ºF to 1562ºF)
-259ºC to 1235ºC
Platinum
(-434ºF to 2255ºF)
-259ºC to 630ºC
Platinum
(-434ºF to 1166ºF)
nVision's RTD100 temperature module is designed to be used with 100Ω
platinum RTDs that can be wired in 2, 3, or 4-wire methodology. Default nVision setting is 3-wire,
but this can be modified with CrystalControl to achieve the method that you prefer.
See Temperature Module (RTD100) Specifications for further information.

Callendar-Van.Dusen.Equation

The relationship between temperature and resistance is given by the Callendar-Van Dusen
equation.
R = R [1 + AT + BT + CT
2
T 0
R = R [1 + AT + BT ] for (0°C ≤ T ≤ °C of Upper Temperature Range listed below)
2
T 0
Where: R = the resistance at temperature, T; R
T
and C dependent upon RTD selected (TCR).
nVision (TCR)
Temp. Coefficient
(Ω/Ω/ºC)
of Resistance
Pt100 (385) Euro 0.00385
Pt100 (3926) US 0.003926
Pt100 (3911) 0.003911
nVision (TCR)
Temp. Coefficient
of Resistance
Pt100 (385) Euro
Pt100 (3926) US
Pt100 (3911)
(T-100)] for (-200°C < T < 0°C)
3
TCR Temperature
Range
-200ºC to 850ºC
(-328ºF to 1562ºF)
-259ºC to 1235ºC
(-434ºF to 2255ºF)
-259ºC to 630ºC
(-434ºF to 1166ºF)
nVision Operation Manual
Base
Resistance
100Ω at 0ºC
100Ω at 0ºC
100Ω at 0ºC
= the resistance at 0°C; and the constants A, B,
0
A
(°C )
-1
3.9083 x 10 -5.7750 x 10
-3
3.9848 x 10
-3
3.9692 x 10 -5.8495 x 10
-3
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Sensitivity
TCR (Ω/Ω/ºC) (avg. Ω/ºC,
0 to 100 ºC)
0.00385 0.385
0.003926 0.3926
0.003911 0.3911
B C
(°C ) (°C )
-2 -4
-4.183 x 10
-7
-5.87 x 10 -4.0 x 10
-7
-4.2325 x 10
-7
-12
-12
-12