How to select a Temperature sensor (Thermocouple Vs RTD)


#1

Thermocouple or RTD which type of sensor is suitable for your application.

Consider the following attributes and decide which sensor is good for your temperature measurement application.

Thermocouple

Operating Range (Deg C) - -200 deg C to 2000 deg C
Accuracy (Deg C) - 1
Linearity - Medium
Thermal response - Fast
Noise Problem - High
long term stability - Low
Cold Junction Compensation - Required
Corrosion Issue - High

RTD

Operating Range (Deg C) - -250 deg C to 850 deg C
Accuracy (Deg C) - 0.03
Linearity - High
Thermal response - Slow
Noise Problem - Medium
long term stability - High
Cold Junction Compensation - Not applicable
Corrosion Issue - Low

Process requirements will drive the sensor choice.