With the IP67-certified Telaire T3000 series from Amphenol Advanced Sensors, SE Spezial-Electronic has a family of robust CO2 sensors in its range. The CO2 sensors are protected against dirt, dust and moisture thanks to a special membrane and work with non-dispersive infrared spectrometry (NDIR). They are available in either a single or dual wavelength version. With an operating temperature range of -30 to +50 °C, an operating voltage of 18 to 30 V(AC) and several output options - analog 0 to 5 V, 0 to 10 V or 4 to 20 mA, digital via UART or Modbus - they can be adapted to the respective requirements. Easy to attach with two screws, the sensors are supplied pre-calibrated. The sensors, which operate with a single wavelength, are also equipped with the patented ABC Logic (Automatic Background Calibration) self-calibration system. This is a special software routine that records the background value for a maximum of 14 consecutive nights and ensures that any drift in the sensor is detected and corrected.