CW-811 series oxygen sensor/transmitter is suitable for O2 concentration monitoring and control, can be used in scientific research, environmental protection, medical industry, to realize the monitoring of the ventilation system, effectively reduce energy consumption, to meet the building ventilation, energy-saving relevant standards, in the garage or automotive maintenance operation workshop and other buildings used in the building, should rely on the ventilation system of the start-stop control, or according to the O2 concentration of automatic control of the operation. Oxygen sensor/transmitter can be used in various intelligent buildings and HVAC systems, such as: airports, railway stations, subway stations, laboratories, schools, pharmaceutical factories, museums, intelligent buildings, gyms and other places. The product adopts the original imported electrochemical oxygen sensor, with a variety of output signals, which can meet different measurement environments and a variety of measurement requirements, high precision and good stability.