Calculate Temperature From Rtd Resistance

RTD Temperature Formula:

\[ T = \frac{(R - R_0)}{\alpha R_0} + T_0 \]

Resistance (R):

Resistance at T0 (R0):

Temperature Coefficient (α):

/°C

Reference Temperature (T0):

°C

Temperature (T):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the RTD Temperature Formula?

The RTD (Resistance Temperature Detector) formula calculates temperature from resistance using the linear approximation: T = (R - R0) / (α R0) + T0. This equation provides a reliable method for temperature measurement using RTD sensors.

2. How Does the Calculator Work?

The calculator uses the RTD temperature formula:

\[ T = \frac{(R - R_0)}{\alpha R_0} + T_0 \]

Where:

\( T \) — Temperature (°C)
\( R \) — Measured resistance (Ω)
\( R_0 \) — Resistance at reference temperature T0 (Ω)
\( \alpha \) — Temperature coefficient (/°C)
\( T_0 \) — Reference temperature (°C)

Explanation: The equation calculates temperature based on the linear relationship between resistance and temperature in RTD sensors, using a known reference point and temperature coefficient.

3. Importance of Temperature Calculation

Details: Accurate temperature calculation from RTD resistance is crucial for industrial processes, environmental monitoring, laboratory measurements, and various scientific applications where precise temperature control is required.

4. Using the Calculator

Tips: Enter resistance in ohms (Ω), reference resistance in ohms (Ω), temperature coefficient in /°C, and reference temperature in °C. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical temperature coefficient for platinum RTDs?
A: For platinum RTDs, the temperature coefficient α is typically 0.00385 /°C, which is the standard for PT100 and PT1000 sensors.

Q2: How accurate is the linear approximation?
A: The linear approximation is reasonably accurate for small temperature ranges around the reference point. For wider ranges, more complex equations (like Callendar-Van Dusen) may be needed.

Q3: What are common reference temperatures?
A: Common reference temperatures are 0°C (ice point) or 25°C (room temperature), with corresponding resistance values specified for the RTD sensor.

Q4: Can this formula be used for all RTD types?
A: While the basic principle applies to all RTDs, different materials may have different temperature coefficients. Always use the α value specified for your particular RTD sensor.

Q5: What factors can affect measurement accuracy?
A: Lead resistance, self-heating effects, sensor calibration, and environmental conditions can all impact the accuracy of temperature measurements using RTDs.