The thermocouple working principle is based on the Seeback Effect. This effect states that when a closed circuit is formed by jointing two dissimilar metals at two junctions, and junctions are maintained at different temperatures then an electromotive force (e.m.f.) is induced in this closed circuit.
What is a thermocouple?
Ans-thermocouple is a sensor that measures temperature. It consists of two different types of metals, joined together at one end. When the junction of the two metals is heated or cooled, a voltage is created that can be correlated back to the temperature.
Thermocouple Types and Range?
| Types | Limit of Error | Temperature Range |
|---|
| J (Fe - K) | +/- 2.2 ℃ or +/-0.75% | Upto 750 ℃ |
| K (Cr - Al) | +/- 2.2 ℃ or +/-0.75% | Upto 1250 ℃ |
| T (Cu - K) | +/- 1.0 ℃ or +/-0.75% | Upto 350 ℃ |
| R/S/B (Pt/Pt Rh | +/- 2.2 ℃ or +/-0.75% | Upto 1850 ℃ |
| Pt-100 | +/- 1.0 ℃ or +/-0.75% | -200 to +600
|
Thermocouple calculate=1mv=25'C
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