What is the definition of a wall mounted CO2 sensor? A wall mounted CO2 sensor is a device that is used to measure the levels of carbon dioxide in the air. This is typically used in commercial, industrial, and residential buildings to monitor the air quality and ensure that it is safe for occupants. The device is typically mounted on a wall and can be either wired or wireless. The sensor works by measuring the concentration of carbon dioxide in the air and then sending a signal to a central monitoring system. This system can then alert occupants of any changes to the CO2 levels that are outside of the normal range. Wall mounted CO2 sensors can also be used to detect a buildup of CO2 in areas such as parking garages or basements which could cause asphyxiation. These sensors are essential in commercial applications as they help to keep workers safe and can also help to reduce energy costs.