Draeger X AM 2500 LEL O2 CO LC H2S LC Power Pack. Dräger’s X-am® 2500 accurately detects O2, CO, NO2, SO2 and H2S. It is the only 1–4 gas monitor needed in industrial and refinery applications. The X-am® 2500 combines reliable sensor technology with long battery life and intuitive operation in an instrument that represents safety with long battery life and intuitive operation in an instrument that represents safety.