1. What is the Pt100 Temperature Calculation?

The Pt100 temperature calculation converts resistance values from a Pt100 temperature sensor into corresponding temperature readings. Pt100 sensors are platinum resistance thermometers that provide accurate temperature measurements across a wide range.

2. How Does the Calculator Work?

The calculator uses the linear approximation formula:

Where:

• \( T \) — Temperature in degrees Celsius (°C)
• \( R \) — Resistance in ohms (Ω)
• 100 — Reference resistance at 0°C
• 0.385 — Temperature coefficient (Ω/°C)

Explanation: This formula provides a linear approximation of temperature based on the resistance change of a Pt100 sensor, which has a resistance of 100Ω at 0°C and increases by approximately 0.385Ω per degree Celsius.

3. Importance of Temperature Calculation

Details: Accurate temperature measurement is crucial for industrial processes, laboratory experiments, environmental monitoring, and various control systems. Pt100 sensors are widely used due to their accuracy, stability, and wide temperature range.

4. Using the Calculator

Tips: Enter the resistance value in ohms measured from your Pt100 sensor. The calculator will provide the corresponding temperature in degrees Celsius. Ensure the resistance value is valid and greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the temperature range for this calculation?
A: This linear approximation works well for the range of -200°C to 850°C, though for extreme temperatures, more complex polynomial equations may provide better accuracy.

Q2: Why is 100 ohms used as the reference?
A: Pt100 sensors are named for their resistance of 100 ohms at 0°C, which serves as the baseline reference point for temperature calculations.

Q3: How accurate is this linear approximation?
A: The linear approximation provides good accuracy for most applications, though the actual Pt100 response is slightly non-linear. For high-precision applications, use the full Callendar-Van Dusen equation.

Q4: Can this calculator be used for other RTD types?
A: This specific formula is designed for Pt100 sensors. Other RTD types (like Pt1000) have different reference resistances and temperature coefficients.

Q5: What factors can affect measurement accuracy?
A: Lead wire resistance, self-heating effects, sensor calibration, and electrical noise can all impact the accuracy of resistance measurements and therefore temperature calculations.