The AS-2 CO2 Alarm Station is an audible-visual alarm module that features a color-coded LED indicator and a digital LCD ppm level display. It is designed to be mounted on the outside of grow rooms or grow facilities to monitor the ppm level of CO2. The AS-2 can be connected to either the AL-1 or AL-2 CO2 sensor channels, or it can be connected to both sensor channels for complete redundancy.

The green LED shows that the CO2 level is below 800 ppm, meaning it is safe to enter the room. The yellow LED shows a CO2 level equal to or greater than 800 ppm, meaning supplemental CO2 is being used. The AS-2 will sound an audible alarm and the red LED will flash in the event that the CO2 level exceeds the user-preferred level set on the Carbon-X main controller.