Thermocouple (thermocouple) temperature measuring instruments commonly used in temperature measurement devices, which directly measure the temperature, and the temperature signal converted into thermal EMF signals through electrical instrument (secondary instrument) into the temperature of the measured medium. Often due to a variety of thermocouple appearance very different needs, but their basic structure is roughly the same, usually by the main part of the hot electrode, insulating sleeve to protect pipes and junction boxes, etc., usually display instruments, recording instruments and electronic regulation supporting the use.