The Consilium DOS3 is a high-performance analogue addressable optical smoke detector designed for early detection of smouldering fires. It operates on the light-scattering principle, providing a swift and reliable response to visible smoke particles. Engineered for integration with Consilium’s Salwico CS3000 and CS4000 fire alarm systems, the DOS3 is equipped with a built-in microprocessor for advanced signal processing and self-diagnostics. Its robust construction makes it ideal for demanding environments, particularly in marine and industrial applications. The detector is fully compliant with EN 54-7 standards and features an unpolarised, two-wire connection to simplify installation and minimize wiring errors.