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Technical Reference

Common Temperature Transducers

References

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»	Omega

Common Temperature Transducers

The purpose of the folowing pages is to explore various temperature monitoring techniques and their characteristics which will assist you to select the required input.

Common temperature transducers: Thermocouple, RTD, Thermistor, Integrated Circuit Sensor

FEATURES	Thermocouple	RTD	Thermistor	I.C.Sensor
R / T Characteristics	Non-Linear	Linear	Non-Linear	Most Linear
Temp. (T) Range	Wide	Wide	Limited	Limited
Output	Low Voltage	Small change in R	High Output	Highest Output
Stability	Short term	Long term	Long term	Refer to manufacturer's guide
Response	Reasonably Fast	Slow	Reasonably Fast	Refer to manufacturer's guide
Sensitivity	Least Sensitive	Average	~10 times that of RTD	Refer to manufacturer's guide
Accuracy (Theoretical)	High	High	Highest (0.02 ^oC)	Refer to manufacturer's guide
Source	Self-Powered	Current	Current	Power Supply
Self-Heating	No	Yes	Yes	Yes
Construction	Simple & Rugged	Fragile	Fragile	Fragile
Cost	Inexpensive	Expensive	Inexpensive	Inexpensive
Miscellaneous	Reference required	Low absolute resistance	Two-wire ohm measurement	Limited configuration
V/R Vs. T characteristics of the sensor.

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Last Updated April 28, 2009

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