Siemens FDO421 Addressable Photoelectric Smoke Detector SF 11/02 and helps reduce confusion with

and helps reduce confusion with verbal announcements such as “Replace alarm” at end of alarm life

Master Firefighters’ Telephone Kit

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The Siemens XTRI-D is an intelligent dual-input interface module for monitoring two sets of normally open or normally closed dry contacts on the SLC

Siemens FDO421 Addressable Photoelectric Smoke Detector SF 11/02 and helps reduce confusion withThe Siemens FDO421 is an intelligent, addressable photoelectric smoke detector designed for use with Desigo Fire Safety and FireFinder XLS V series control panels. It incorporates microprocessor based signal processing and an optical light scattering sensing chamber to provide stable and accurate smoke detection. The FDO421 features built in ISOtechnology to support True Class X SLC operation (optional use), enhancing loop reliability and enabling