The Elta 149-EC-CO2TH3M is a precision room sensor that monitors CO2, temperature, and relative humidity, supporting Part F compliance requirements. It operates with either +24V AC/DC or 230V 50/60Hz power supplies and delivers a linear +10V output, ideal for controlling EC fans or speed controllers. An integrated VFC relay provides alarm signaling when CO2 exceeds set thresholds. Communication options include BACnet and Modbus for seamless system integration. A tri-color LED indicator visually displays CO2 concentration, offering an intuitive user interface for real-time air quality awareness.