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Difference Between RTD and Thermocouple

 

Comparison Chart

Basis for Comparison                              RTD                        Thermocouple
Operating PrincipleTemperature changes with a change in resistance.Temperature changes with change in emf generated.
Response time1 – 50s0.1 – 10s
CostHighLow
Operating range-200 to 600°C-200 to 2000°C
Physical sizeLargeComparatively small
SensitivityLowQuite high
AccuracyMoreLess
Self-heatingExistNot Exist
StabilityMoreComparatively less
OutputLinearNon-linear
ApplicationsUsed to measure engine temperature along with the temperature of amplifier and oil temperature sensor, etc.Measures the temperature of chemical and petroleum plants and detects the temperature of metals and aluminum for industrial purposes.




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