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Thermocouple and RTD Signal Integrity: Cable and Grounding

Thermocouple and RTD Signal Integrity: Cable and Grounding

A Class A Pt100 RTD has a tolerance of ±0.15°C, but signal cable errors can dwarf sensor accuracy. This guide covers thermocouple extension wire selection, RTD three-wire and four-wire cable sizing, single-point shielding philosophy, ground loop diagnosis and elimination using isolated transmitters, and a 4-step noise reduction procedure for industrial temperature measurement loops.