GS-CDD Series The GS-CDD Series are duct carbon dioxide gas detectors. These devices provide precision measurement of CO2 gas. These sensors use a highly accurate and reliable Non-dispersive Infrared (NDIR) sensor combined with state-ofthe-art digital linearization and temperature compensated circuitry to monitor duct CO2, levels. The duct CO2 transmitter principal of operation is based on the Venturi effect of the probe that extends into the HVAC duct. Air flowing through the duct is forced into the vent holes on one side of the probe, into the enclosure, over the CO2 sensor and then the air is drawn back out of the enclosure via the vent holes on the opposite side of the probe. Optional temperature sensor and adjustable relay output is also available. Applications Used for demand controlled ventilation (DCV) Used for monitoring air quality Used in greenhouses Features & Benefits Economical Models with adjustable range Menu driven set-up Guaranteed 5 year calibration interval Accurate carbon dioxide monitoring for increased comfort Duct CO2 Sensors
