Siemens (Pyro) | OP921
Detector Photoelectric Smoke Plug-In Addr 2-Wire
The Siemens OP921 is an intelligent, addressable photoelectric smoke detector designed for reliable fire detection in various environments. Utilizing advanced microprocessor-based signal processing, it offers accurate smoke detection with built-in ISOtechnology™ for enhanced system reliability and circuit integrity. The OP921 features a tri-color LED indicator providing 360° visibility, with distinct colors indicating normal operation, trouble conditions, or alarms. It is compatible with Siemens’ field-device programmer/test unit (Model 8720 | DPU) for efficient programming and testing. The detector supports field-selectable application-sensitivity profiles and automatic environment compensation, ensuring optimal performance across different settings. Its design includes a dust-resistant photoelectric chamber and is compatible with Model DB-11–series mounting bases. The OP921 is UL 268 7th Edition Listed and complies with NFPA 72 standards, making it a reliable choice for fire detection needs.