The temperature detection technology is relatively mature now, and the development changes are relatively small. The main change is that the temperature transmitter has developed rapidly and has entered into a new period of automation and intelligence. The protective performance of temperature detection instruments has been strengthened, such as anti-corrosion, explosion-proof, anti-corrosion, waterproof, etc. The selection of temperature detection methods is particularly important for its use and control in industrial sites. Appropriate measurement methods can get twofold result with half the effort. The following passage is brief description of temperature transmitter type.