Thermocouple Temperature Sensor

A thermocouple is a junction formed from two dissimilar metals. Actually, it is a pair of junctions. One at a reference temperature and the other junction at the temperature to be measured. A temperature difference will cause a voltage to be developed that is temperature dependent. Thermocouples are widely used for temperature measurement because they are inexpensive, rugged and reliable, and they can be used over a wide temperature range.