Drager Polytron ® 8720 IR is the most advanced explosion-proof transmitter for detecting carbon dioxide by percentage volume or ppm. It features a high-performance infrared Drager PIR 7200 sensor that can be submerged without damage. In addition to 3-wire 4 to 20 mA analog outputs with relays, it offers HART®, Modbus, and Fieldbus, making it compatible with most control systems.