RTD vs Thermocouple

http://en.wikipedia.org/wiki/Resistance_thermometer
http://en.wikipedia.org/wiki/Thermocouples

When should control engineers use a Thermocouple or RTD?

RTD
RTD = resistance temperature detectors
below 600 °C
High accuracy
Low drift
Wide operating range
Suitability for precision application

The most common of RTD is PT 100, R = 100 ohm at 0°C, sensitivity 0.385 ohm/°C

THERMOCOUPLE
A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference
range ?180 to 2,320 °C

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56 thoughts on “RTD vs Thermocouple”

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  3. Thermocouples are inexpensive, rugged, and fast reply time that they are less accurate and the least stable and responsive. RTD's are the best choice for repeatability and most stable and accurate. They have a slow response time and because they require a current source they do have a low amount of self heating.

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