The newly expanded Infrared Carbon Dioxide gas analyzers for measuring full ranges of Carbon Dioxide (CO2) up to 1-percent in 10 ppm increments, 10-percent, or 100-percent volume are available in either portable or wall-mounted NEMA 4X enclosures. Optional electrochemical oxygen and toxic gas sensors can also be added. Weighing about three pounds, the analyzer includes an internal sample pump, backlit LCD digital display, adjustable alarms, and can be configured with 0-1 VDC or 4-20 mA outputs, contact closure relay, and rechargeable batteries that allow for portable use or continuously on AC power with the included battery charger. Carrying cases, calibration kits, and a data logger with cable and Windows PC software are some of the optional accessories available. Applicable for use in office ventilation systems, cooling systems, hazardous environments, laboratory and research projects, food related industries, breweries, mushroom growing, greenhouse horticulture, welding, and various other applications where Carbon Dioxide or IAQ levels need monitoring.