Amphenol Advanced Sensors Telaire® Ventostat® T8031 CO₂ Duct Mount Transmitter Sensor offers accuracy and versatility in a small, easy to install form factor. The T8031 series remains accurate for the expected life of the device by using Telaire's ABC Logic™ (Automatic Background Calibration) technology and patented absorption infrared/gas sensing engine. The ABC Logic technology eliminates the need for manual calibration in most applications.