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RTD Temperature Formula:
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The RTD (Resistance Temperature Detector) resistance to temperature calculation converts the measured resistance of an RTD sensor into temperature using the linear approximation formula. RTDs are precision temperature sensors that use the predictable change in electrical resistance of metals with temperature.
The calculator uses the RTD temperature formula:
Where:
Explanation: This formula provides a linear approximation of the temperature-resistance relationship for RTD sensors, which is accurate for most practical applications.
Details: Accurate temperature measurement is crucial for industrial processes, laboratory experiments, environmental monitoring, and quality control. RTDs offer high accuracy, stability, and repeatability compared to other temperature sensors.
Tips: Enter the measured RTD resistance in ohms, the reference resistance at 0°C in ohms, and the temperature coefficient α in 1/°C. All values must be positive numbers for accurate calculation.
Q1: What is the typical α value for platinum RTDs?
A: For platinum RTDs (PT100, PT1000), the standard α value is 0.00385 Ω/Ω/°C.
Q2: Why is R₀ important in RTD calculations?
A: R₀ represents the resistance at 0°C and serves as the calibration reference point for accurate temperature measurements.
Q3: What are common RTD types and their R₀ values?
A: Common types include PT100 (100Ω at 0°C), PT500 (500Ω at 0°C), and PT1000 (1000Ω at 0°C).
Q4: Is the linear approximation accurate for all temperature ranges?
A: The linear approximation is most accurate near the reference temperature. For wider temperature ranges, more complex equations (Callendar-Van Dusen) may be needed.
Q5: What factors can affect RTD accuracy?
A: Self-heating, lead wire resistance, sensor placement, and electrical noise can affect measurement accuracy.