Rtd Ohms To Degrees Calculator

RTD Temperature Calculation 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):

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1. What is the RTD Temperature Calculation?

The RTD (Resistance Temperature Detector) temperature calculation estimates temperature from resistance measurements using the linear approximation formula. RTDs are precision temperature sensors that exhibit a predictable resistance change with temperature.

2. How Does the Calculator Work?

The calculator uses the RTD temperature formula:

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

Where:

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

Explanation: This formula provides a linear approximation of the temperature-resistance relationship for RTDs, which is accurate over limited temperature ranges.

3. Importance of RTD Temperature Calculation

Details: Accurate temperature measurement is crucial for industrial processes, laboratory experiments, environmental monitoring, and quality control systems 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 α value for platinum RTDs?
A: For platinum RTDs (PT100), the standard temperature coefficient α is 0.00385 /°C.

Q2: What is the temperature range for this linear approximation?
A: The linear approximation is typically accurate within ±50°C around the reference temperature. For wider ranges, more complex equations (Callendar-Van Dusen) are used.

Q3: What is R0 for a standard PT100 sensor?
A: For PT100 sensors, R0 is typically 100Ω at 0°C reference temperature.

Q4: How accurate is this calculation compared to RTD tables?
A: This linear approximation provides good accuracy for most applications, though RTD standard tables (IEC 60751) provide more precise values using higher-order polynomials.

Q5: Can this calculator be used for other RTD types besides platinum?
A: Yes, the formula works for any RTD type (nickel, copper, etc.) as long as the appropriate α and R0 values are used for that specific material.