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RTD Formula Calculator

What is an RTD?

An RTD (Resistance Temperature Detector) is a sensor used to measure temperature by correlating the resistance of the RTD element with temperature. RTDs are known for their accuracy and stability over a wide temperature range. They are commonly used in industrial applications where precise temperature measurements are required.

Formula

The formula to calculate the resistance at a specific temperature for an RTD is:

$R_t = R_0 (1 + \alpha (T - T_0))$

Where:

$R_t$ is the resistance at temperature $T$ (Ω).
$R_0$ is the base resistance at reference temperature $T_0$ (Ω).
$\alpha$ is the temperature coefficient of resistance (°C⁻¹).
$T$ is the temperature at which resistance is measured (°C).
$T_0$ is the reference temperature, usually 0°C for calculations.

Example

Let's say the base resistance is 100 Ω, the temperature coefficient is 0.00385 °C⁻¹, the temperature is 100 °C, and the reference temperature is 0 °C. Using the formula:

$R_t = 100 (1 + 0.00385 (100 - 0))$

We get:

$R_t = 100 (1 + 0.385) = 100 (1.385) = 138.5$

So, the resistance at 100 °C ( $R_t$ ) is 138.5 Ω.