RTD vs thermocouple: choosing industrial temperature sensing
Compare RTDs and thermocouples on accuracy, range, speed, and wiring — plus when to use thermistors, IR, or fiber-optic sensing instead.
RTD
Resistance temperature detector.
Temperature sensor whose resistance rises predictably with temperature (Pt100 = 100 Ω at 0 °C). Accurate and stable; 3- or 4-wire connections cancel lead resistance.
See also: Thermocouple · PLC
Use the concept: 4–20 mA loop scaling · Engineering unit converter · Process instrumentation: signal, measurement and control
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