Pt100 Electrical Resistance

Overview

Engineering reference data for Pt100 Electrical Resistance in electrical engineering.

Key Formulas

Ohm's Law

$V = IR$

Voltage = Current × Resistance.

Power

$P = VI = I^2R = V^2/R$

Electrical power.

Energy

$E = Pt$

Energy = Power × Time.

Variables

Linearization Equation

The resistance-temperature relationship for a PT100 sensor is nonlinear. For high-accuracy applications, it is described by the Callendar-Van Dusen equation:

$$R_t = R_0 (1 + A t + B t^2 + C (t - 100) t^3)$$

Where:

• $R_t$ = Resistance at temperature $t$ (Ω)
• $R_0$ = Resistance at 0 °C (100 Ω for PT100)
• $t$ = Temperature (°C)
• $A = 3.9083 \times 10^{-3}$
• $B = -5.775 \times 10^{-7}$
• $C = -4.183 \times 10^{-12}$ (for $t < 0$ °C)
• $C = 0$ (for $t \geq 0$ °C)

Related Sensors

PT1000 sensors are similar but have a nominal resistance of 1000 Ω at 0 °C. They offer higher sensitivity and are often used in applications where lead wire resistance can introduce significant measurement error.

Interactive Charts

References

• Original Source