temperature sensors

two connected metals convert the temperature signal into mv
(-500 mv to 500 mv).
several types for temp. ranges:
s    0 ... 1700 °c
r    0 ... 1700 °c
t    100 ... 400 °c
e    0 ... 600 °c
k   -100 ... 1250 °c
j     -50 ... 760 °c
l    -50 ... 760 °c

resistive temperature detector.
several types such as
pt100 -150 ... 450 °c

semiconductor material whose resistance increases with temperature.

semiconductor material whose resistance decreases with temperature.

infrared temperature sensor for very high and non-contact temperature detection