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AS-4
The AS-4 CO2 alarm station with a blue light alarm module is equipped with a blue LED display indicator and a digital LCD readout of the ppm level. It is designed to be mounted outside the space to be monitored and will display the CO2 ppm level. The AC-4 can be connected to either low-level CO2 sensors or high-level sensors, or it can be connected to both sensors for complete redundancy.
The AS-4 will sound an audible alarm and flash the blue LED indicator if the CO2 level exceeds the user's preferred level set in the main controller.