When selecting an RTD or thermocouple sensor, it is important to note that each sensor type has distinct advantages. Moore Industries International Inc., Sepulveda, Calif., offers the following tips about temperature sensors.

Why choose an RTD over a thermocouple?
  • Accuracy and repeatability.
  • Stability over time.
  • RTD extension wire is less expensive - copper vs. thermocouple wire.
Why choose a thermocouple over an RTD?

RTD sensors are more accurate and have higher repeatability compared to thermocouple sensors. That being said, thermocouples are the best choice when:
  • The temperature is above 1,100°F (593°C).
  • A grounded or exposed thermocouple junction has a faster response time than an RTD.
  • Generally, thermocouples are less expensive.