10800 – Temperature and Pressure Control for Power Generation, Oil/Gas, Pharmaceutical, BioTech, Cement, Paper & Pulp, etc. A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created. The voltage can then be interpreted using thermocouple reference tables to calculate the temperature. Thermocouples are used in many industrial, scientific, and OEM applications. They can be found in nearly all industrial markets: Thermocouples are also used in everyday appliances like stoves, furnaces, and toasters.