Pt100 Resistance To Temperature Calculator

PT100 Temperature Equation:

\[ T = \frac{R - R_0}{\alpha \times R_0} \]

Temperature (T):

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1. What is the PT100 Resistance to Temperature Equation?

The PT100 resistance to temperature equation calculates temperature from the measured resistance of a PT100 sensor. PT100 is a platinum resistance thermometer that provides accurate temperature measurements based on the predictable change in platinum's electrical resistance with temperature.

2. How Does the Calculator Work?

The calculator uses the PT100 temperature equation:

\[ T = \frac{R - R_0}{\alpha \times R_0} \]

Where:

\( R \) — Measured resistance (ohms)
\( R_0 \) — Reference resistance at 0°C (typically 100 ohms)
\( \alpha \) — Temperature coefficient (typically 0.00385 1/°C)
\( T \) — Calculated temperature (°C)

Explanation: The equation calculates temperature based on the linear relationship between resistance and temperature for platinum sensors, using the known temperature coefficient and reference resistance.

3. Importance of Temperature Calculation

Details: Accurate temperature measurement is crucial for industrial processes, laboratory experiments, environmental monitoring, and various scientific applications where precise temperature control is required.

4. Using the Calculator

Tips: Enter measured resistance in ohms, reference resistance (typically 100 ohms), and temperature coefficient (typically 0.00385 1/°C). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a PT100 sensor?
A: A PT100 is a platinum resistance thermometer that measures temperature based on the change in electrical resistance of platinum. The "100" refers to its resistance of 100 ohms at 0°C.

Q2: Why is the temperature coefficient 0.00385?
A: 0.00385 1/°C is the standard temperature coefficient for industrial PT100 sensors according to the IEC 60751 standard, representing the average resistance change per degree Celsius.

Q3: What is the temperature range for this calculation?
A: This linear approximation is most accurate between -200°C to 850°C, though for precise measurements at extreme temperatures, more complex equations may be needed.

Q4: Are there different types of PT100 sensors?
A: Yes, PT100 sensors come in different classes (A, B) with varying accuracy levels, and different wire configurations (2-wire, 3-wire, 4-wire) for different measurement precision requirements.

Q5: When should I use a more complex equation?
A: For high-precision applications or extreme temperature ranges, use the Callendar-Van Dusen equation which accounts for non-linearities in the resistance-temperature relationship.