Hot junction: What is a Hot junction?

A hot junction is the measuring point on a temperature sensor, most commonly a thermocouple. It is the point where the positive and negative legs of the thermocouple wire are welded together. Hot junctions are created without any medium to reduce contamination, and at Peak Sensors we laser weld thermocouple hot junctions. Hot junctions can also be used to describe the point where a pt100 sensor has been attached to its leads although the measuring point on a resistance thermometer is the element itself.