The CEA 266 wall-mounted, infrared carbon dioxide gas analyzer from CEA Instruments, Inc. (Emerson, NJ) is a newly improved version of the company's CEA 244. Ranges of 2 to 2,000 ppm, 0 to 5,000 ppm, 0 to 1%, 0 to 2%, 0 to 5%, 0 to 10%, or 0 to 20% are available. The sample gas is continuously drawn into the unit through a built-in air pump. A self-draining water trap and dust filter are also provided. The unit includes 0- to 5-vdc and 4- to 200-mA outputs and two user- adjustable alarms and contact relays.