The Apollo 58000-400MAR is a high-performance Discovery Marine Ionisation Smoke Detector, specifically engineered for use in demanding marine environments. It is designed to provide early warning of fast-burning, flaming fires that produce minimal visible smoke. This detector utilizes a low-activity radioactive foil to irradiate the air in the smoke chamber, causing a small, continuous electric current. When smoke particles enter the chamber, they disrupt this current, triggering an alarm state. The 58000-400MAR is renowned for its reliability, transient rejection, and suitability for applications on ships and offshore installations, holding numerous marine-specific approvals.