The AS-2 CO2 Alarm Station combines an audio-visual alarm module with a color-coded LED display indicator and a LCD digital ppm level reading. It is designed to be mounted outside of the space to be monitored, and will display the CO2 ppm level. The AS-2 can be linked to either the low or the high level CO2 sensors, or it can linked to both sensors for complete redundancy.

The green LED indicator shows the CO2 level is below 800ppm which means the room is safe to entry. The yellow LED indicator shows CO2 level equal or above 800ppm which means supplemental CO2 is in use. The AS-2 will sounds an audible alarm and blinking red LED indicator in the event of the CO2 level going above normal or safe levels.