The detector is designed to detect fire, accompanied by the appearance of smoke, and alert people about a fire. The detector is designed for round-the-clock continuous operation from a built-in battery (such as "Krona", Corundum ") or an external power source with voltage from 9 to 16V. The detector monitors the serviceability and dustiness of the optical density measuring channel, compensates for the dustiness of the optical node and signals that the permissible dustiness is exceeded.