Discussion: Types and Selection of Resistance Temperature Detectors (RTDs)

RTDs are more accurate and reliable than thermocouples. You should  also understand that RTD’s sensing element is a resistor that changes  resistance with temperature and it is connected to the control circuitry  through a wire.
Answer the following:

In order to select the suitable detector, what materials should be used as sensing elements and wire materials for RTDs?
How are thermocouples types and temperature ranges involved?