The TR9290 family of sensors are value-engineered CO2 transmitter targeted at applications where the only requirement is a dependable CO2 sensor that never needs calibration. Key features of these CO2 transmitters include: Internal self-calibration method based on background measurement that also eliminates need for outdoor CO2 sensor. Choice of outputs: 0-10V, 0-5V or 4-20mA and LonWorks®. Built to ISO 9001 standards. Mounting options include wall, duct and in-duct. Utilizes a proven infrared measurement technology with over 18 years of flawless operating history.