The GS-CDR Series are room carbon dioxide gas detectors. These devices provide precision measurement of CO2 gas. The GS-CDR series uses a highly accurate and reliable Nondispersive Infrared (NDIR) sensor combined with state-of-theart digital linearization and temperature compensated circuitry in an attractive, low profile enclosure for room applications to monitor room CO2 levels. A linear analog signal output of 4-20 mA, 0-5 or 0-10 Vdc is provided for connection to a building automation system. Optional features such as temperature sensor, setpoint adjustment, manual override and adjustable relay output are available.