technology (NDIR) and imported electrochemical gas sensor scheme, real-time on-line monitoring of multi-component gas is realized.The system has the functions of real-time data transmission, state display, automatic backblowing and so on, realizing the unattended work site. The whole system has the advantages of simple structure, wide dynamic range, strong real-time performance and low operation cost.At the same time, the system adopts a modular structure, which is convenient for combination, and can fully meet the requirements for communication with the enterprise's internal DCS system.It can effectively promote the improvement of production technology and management level, and play the purpose of energy saving and consumption reduction, high yield and high efficiency.