Thermocouple is a temperature measurement device consisting of two dissimilar metals joined at one end to form a junction. When there is a temperature difference between the junction and the other ends, a voltage is produced due to the Seebeck effect. This effect converts thermal energy into electrical energy proportional to the temperature difference. Thermocouples have various applications in industries like steel, gas, manufacturing, and power production to measure temperature. Common types are classified based on the materials used like copper-constantan, iron-constantan, and platinum-rhodium. Thermocouples can operate within a wide range of temperatures depending on the type.

1. ThermocoupleThermocouple
Presented by:
J K SHREEJ K SHREE
5115/TRG/2015/G5115/TRG/2015/G

2. INTRODUCTION
 A thermocouple is a temperature-measuring device consisting of
two dissimilar conductors that contact each other at one junction.
 It produces a voltage when the temperature of one of the ends
differs from the reference temperature at other end of the circuit.
Metal A
Metal B
Junction
Voltmeter

3. THERMOCOUPLES: SEEBECK EFFECT
 The Seebeck effect is the conversion of thermal
energy/temperature differences directly into electrical energy or
electricity.
 The change in the voltage is proportional to the temperature
difference between the junctions when the ends are connected to
form a loop.

4. PRINCIPLE OF OPERATION
The EMF generated by
the Seebeck effect is due
to the temperature
gradient along the wire.
The EMF is not generated
at the junction between
two dissimilar wires.

5. APPLICATIONS
1.Steel industry
2.Gas appliance safety
3.Thermopile radiation sensors
4.Manufacturing
5.Power production
6.Thermoelectric cooling
7.Process plants
8.Thermocouple as vacuum gauge
9. Heaters

6. A thermocouple (the right most tube) inside the burner
assembly of a water heater.

7. Thermocouple connection in gas appliances. The end ball (contact) on the left is
insulated from the fitting by an insulating washer. The thermocouple line consists
of copper wire, insulator and outer metal (usually copper) sheath which is also
used as ground.

8. TYPES & SPECIFICATIONS

10. Advantages

12. DISCOVERED FACTS
• Construction of Thermocouple
• How thermocouple types are classified
based on material used?
• Seebeck effect
• Range of temperature that it operates

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