The Esser by Honeywell IQ8Quad Optical Smoke Detector (Model 802371) is an intelligent addressable optical smoke detector designed for the early detection of slow-burning and smouldering fires. Utilizing the proven light scatter detection principle, the detector delivers reliable and accurate smoke detection while minimizing false alarms. Equipped with decentralized intelligence, an integrated short-circuit isolator, automatic self-testing, alarm memory, and soft addressing, the IQ8Quad 802371 ensures high system reliability and simplified maintenance. It is fully compatible with Esser esserbus® and esserbus®-PLus intelligent fire alarm systems, making it an ideal solution for commercial, industrial, healthcare, and institutional fire protection applications.