The thermocouple principal is derived from using two dissimilar metal conductors and forming a circuit with one junction at a higher temperature than the other. This allows a current to flow and the resultant EMF will be proportional to the temperature difference between the two junctions.
TYPES
Miniature small and Standard Big K,J,T, & RTD Types:
Contact Parts: From original thermoc-ouple Alloy metal.
Construction: glass filed nylon moulding .
K= Yellow colour. T = Blue Colour, J = Black Colour