The Callendar Van Dusen Equation for Platinum Based RTD Thermometers
The Callendar-Van-Dusen equation describes the relationship between the Ohmic Resistance and Temperature of Platinum based temperature instruments. This equation is commonly used in commercial applications in RTD thermometers and RTD Transmitters. In its original form, the Callendar-Van-Dusen Equation is given by:
Rt = R0 + R0α[t – δ(0.01t – 1)(0.01t) – β(0.01t – 1)(0.01t)3]
Where:
Rt = Resistance at Temperature t (°C)
R0 = Resistance at t = 0°C
α = Sensor specific contant
δ = Sensor specific constant
β = Sensor specific constant (0 at t > 0°C, 0.11 at t < 0°C)
The above equation has been used in the EN/IEC 60751 standard in the format below:
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Rt = R0 + R0α[t – δ(0.01t – 1)(0.01t) – β(0.01t – 1)(0.01t)3]
Where:
Rt = Resistance at Temperature t (°C)
R0 = Resistance at t = 0°C
α = Sensor specific contant
δ = Sensor specific constant
β = Sensor specific constant (0 at t > 0°C, 0.11 at t < 0°C)
The above equation has been used in the EN/IEC 60751 standard in the format below:
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