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Siemens OP921 Cerberus PRO Intelligent Photoelectric Smoke Detector

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.

Key Features:

• Advanced Optical Sensing: Utilizes a wide-spectrum infrared light-emitting diode (IRLED) and a light-sensing photodiode to detect smoke particles using the light-scattering principle, enhancing sensitivity to a broad range of smoke types.

• Intelligent Addressability: Features integral communication capabilities, providing precise point identification for alarm signaling and facilitating selective maintenance.

• Tri-Color LED Indicator: Equipped with a tri-color LED that provides 360° visibility, indicating device status with green, yellow, or red colors for normal operation, maintenance alerts, or alarm conditions.

• Field-Selectable Sensitivity Profiles: Allows customization of sensitivity settings to suit specific environmental conditions, ensuring optimal performance and minimizing false alarms.

• Automatic Environmental Compensation: Continuously adjusts sensitivity to account for environmental factors such as dust accumulation, maintaining reliable detection over time.