A thermal coupler is a temperature-measuring device fitted with two wire legs made of different metals welded together at one end, to create a junction where the temperature is measured. When the junction feels a temperature change, a voltage that can be interpreted by thermocouple reference tables is created.
Thermal couplers, also known as thermocouples, are of different types that each come with unique features. The types include J, K, T and E, which are base metal. Types R, S and B are noble metal thermal couplers that measure high temperatures. Thermal couplers are used in various applications including industrial and scientific. These devices are popular because of their cost effectiveness, durability, wide temperature ranges and high temperature limits.