Amphenol Advanced Sensors T3030 IP67 Sensors are specially designed for carbon dioxide measurements in harsh or difficult environments and offer accurate readings for HVAC control applications. These sensors feature non-dispersive infrared (NDIR) measuring technology and two easy-mount external tabs. They are offered with analog or digital options and different calibrations are available with up to 20% CO2 concentration. Applications for Amphenol Advanced Sensors T3030 IP67 Sensors include incubators, buses, refrigerators, subway stations, and railway carriages.