What are the Thermocouple Applications?

Thermocouples are the most widely used devices for temperature measurement. Study the most popular thermowell applications in industries.

Thermocouple Typical Applications

  • R-type and B-type thermocouples are suitable in an oxidising atmosphere, easily contaminated in others.
  • T-type can be used in oxidizing or reducing atmospheres.
  • J-type can be used in reducing atmospheres. Least expensive.
  • K-type can be used in oxidizing atmospheres.
  • E-type is the most sensitive. It can be used in an oxidising atmosphere.

Thermocouple Advantages

  • Low cost
  • Small size
  • Robust
  • Wide range of operation
  • Reasonably table
  • Accurate for large temp. changes
  • Fast response

Thermocouple Disadvantages

    • Weak output, mV
    • Limited accuracy for small variations in temp.
    • Sensitive to electrical noise
    • Non-linear
    • Complex conversion from emf to temp.
    • Small temperature changes mean small very small voltage changes
    • susceptible to noise
    • Non-linear
    • Calibration changes over time
    • Cannot be used bare in conductive fluids

Read Also:

Thermocouple Summary

  • Thermocouples are the most economical elements for measuring temperature and also provide the highest ranges.
  • The emf generated is independent of wire length and diameter, however, noise can be a factor.
  • Thermocouples are not recommended for narrow spans or small temperature difference measurements.
  • For critical temperature measurement, an accurate reference junction temperature needs to be measured and compensated for.
  • T/C’s are low cost but should only be used where another element is not practical.

Detection of Thermocouple Faults

  • Short in the extension wires may not be detected
  • Measure resistance continuously to note any changes

Thermocouple Voltage Curves

Thermocouple Voltage Curves

Share With Your Friends

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address

Leave a Comment

What are the Thermocouple Applications?

Send this to a friend