Thermocouple is a kind of temperature sensor, which consists of two different metal wires, one end is connected together, the other end is connected to thermocouple thermometer or other equipment supporting thermocouple. After the correct configuration, the thermocouple can be used for temperature measurement in various temperature ranges.What are the different thermocouple types? Thermocouples have different metal or "graduation" combinations. The most common types are j, K, t, e, and n "foundation" thermocouples. There are also special types of thermocouples, called precious metal thermocouples, including types R, s, and B. The maximum temperature thermocouple type is fire resistant, including C, G and D types.