CD-U Series Air Quality Sensors

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The CD-U Series CO2 and temperature sensors are available as an in-wall mounted room enclosure or duct mount enclosure. The CD-U Series provides installation flexibility and cost savings and includes the following features:

The CD-U Series incorporates a dual channel nondispersive infrared (NDIR) CO2 sensor and self calibration feature to correct for a CO2 sensor drift. This feature is useful for applications with periodic occupancy, for example, schools or offices, where the CO2 sensor is exposed to fresh air (400 ppm) at least 1 h a day. For spaces with 24 h a day occupancy, for example, hospitals or call centers, or spaces that consistently maintain higher or lower levels of CO2, it is possible to switch off the self-calibration feature and perform a yearly calibration instead.

The CD-U Series features a calibration reference screen that enables the user to set the calibration gas level used to calibrate the sensor. The minimum value is 400 ppm, the maximum value is 2000 ppm, and the increment value is 50 ppm for each step. If no calibration gas is available, expose the sensor to fresh outside air and calibrate with a 400 ppm value. Alternatively, use a calibrated unit as a reference to determine the CO2 ambient level and adjust the calibration setting to the required value.