THERMOCOUPLE<br />∙ Principle of Operation<br />∙ Materials Used<br />∙ Advantages<br />∙ Applications<br />∙ Comparison w...
A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference.<br />
Principle of Operation<br />Thermocouples are based on the principle that two wires made of dissimilar materials connected...
Seebeck Effect<br />
Materials Used<br />Type K:<br />Chromel – Alumel<br />• Range: −200 °C to +1350 °C<br />• Sensi: 41 µV/°C<br />Type J:<br...
Advantages<br />It is rugged in construction<br />Covers a wide temperature range<br />Using extension leads and compensat...
Limitations<br />For accurate temperature measurements, cold junction compensation is necessary<br />The emf induced versu...
Applications<br />Type B, S, R and K thermocouples are used extensively in the steel and iron industries to monitor temper...
Comparison with RTD<br />
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Thermocouple

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Thermocouple

  1. 1. THERMOCOUPLE<br />∙ Principle of Operation<br />∙ Materials Used<br />∙ Advantages<br />∙ Applications<br />∙ Comparison with RTD<br />∙ Limitations<br />By<br />AnandBongir<br />GirjashankarMishra<br />
  2. 2. A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference.<br />
  3. 3. Principle of Operation<br />Thermocouples are based on the principle that two wires made of dissimilar materials connected at either end will generate a potential between the two ends that is a function of the materials and temperature difference between the two ends (also called the Seebeck Effect).<br />
  4. 4. Seebeck Effect<br />
  5. 5.
  6. 6. Materials Used<br />Type K:<br />Chromel – Alumel<br />• Range: −200 °C to +1350 °C<br />• Sensi: 41 µV/°C<br />Type J:<br />Iron – Constantan<br />• −40 to +750 °C<br />• 55 µV/°C<br />Type E:<br />Chromel – Constantan<br />• 401 to 900° C<br />• 68 µV/°C<br />Type N:<br />Nicrosil – Nisil<br />• >1200 °C<br />• 39 µV/°C<br />
  7. 7. Advantages<br />It is rugged in construction<br />Covers a wide temperature range<br />Using extension leads and compensating cables, long transmission distances for temperature measurement possible. This is most suitable for temperature measurement of industrial furnaces<br />Comparatively cheaper in cost<br />Calibration can be easily checked<br />Offers good reproducibility<br />High speed of response<br />Satisfactory measurement accuracy<br />
  8. 8. Limitations<br />For accurate temperature measurements, cold junction compensation is necessary<br />The emf induced versus temperature characteristics is somewhat nonlinear<br />Stray voltage pickup is possible<br />In many applications, amplification of signal is required<br />
  9. 9. Applications<br />Type B, S, R and K thermocouples are used extensively in the steel and iron industries to monitor temperatures and chemistry throughout the steel making process.<br />Gas-fed heating appliances such as ovens & water heaters.<br />In the testing of prototype electrical and mechanical apparatus<br />
  10. 10. Comparison with RTD<br />
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