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A rectangle with a diagonal line and a temperature label.
Also known as: RTD, Resistance temperature detector, Platinum resistance thermometer, Pt100
A resistance thermometer measures temperature from the resistance of a pure metal wire, usually platinum. It is more accurate and more stable than a thermocouple and works over a narrower range, and unlike a thermocouple it needs an excitation current.
Denotes a resistance temperature detector: a sensor whose resistance varies predictably with temperature.
Contexts: Electrical equipment
Requires an excitation current to be read, unlike a thermocouple, which generates its own voltage.
Contexts: Electrical equipment
Is wired in three- or four-wire configurations to cancel the resistance of its own leads, which would otherwise appear as a temperature error.
Contexts: Electrical equipment
A rectangle with a diagonal stroke crossing it, marked with a temperature indication and having three or four leads.