TC (thermocouple) is temperature-measuring instrument used in measuring temperature components, which directly measure temperature and thermoelectric temperature signals into signals through electrical instruments (second instrument) converts the measured temperature of the medium. Various thermocouple shape often need very different, but the basic structure remained virtually the same, usually by thermal electrode, insulator protection tubes and junction boxes and other major parts, and display instruments, usually supporting the use of recording instruments and electronic regulator.
In the industrial production process, is one of the most important parameter to be measured and controlled temperature. In measurement of temperature, thermocouples are widely used, it is simple in structure, easy to manufacture, wide measuring range, high accuracy, low inertia, and output signal long-distance transmission, and many other advantages. In addition, since the thermocouple is an active sensor, measurement without external power supply, it is so easy to use, so often in the stove, pipe is used as a measurement of gas temperature or the temperature of the liquid and solid surface.