TrolMaster - CO2 Alarm Station (audio/visual) plus LED display indicator with cable set NEWThe 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 DSA 1 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