3 wire RTD explanation, K type thermocouple cold junction compensation

The RTD is nothing but a resistor which varies according to the variation in temperature. The most commonly used RTD is PT100 & it is simply a two legged device.It can be used as three wire sensor in which one wire is connected to one lead and the other two are shorted & connected to the other lead.The leads must be insulated properly.Tefflon insulated wires are used commonly.The sensor now can be placed in a metal tube with one end closed and must be filled with Magnessium oxide light powder. the sensor can be connected in a wheatstone's bridge as its one arm and its output can be processed.The third wire(shorted)connected to the ground.