www.safetyandhealthmagazine.com/articles/carbon-monoxide-detector-2

Carbon monoxide detector

June 1, 2011
The 4501-04, 2-Wire Carbon Monoxide Gas Sensor Module is a loop-powered gas detector that provides the user with lower cost and easier installation and maintenance. This eliminates the need for separate power runs and associated power distribution and circuit protection for each device. The user-friendly LCD operator interface provides easy access to gas status, calibration instructions, adjustment of ranges and outputs, and diagnostic information.

Sierra Monitor Corp.