Siemens OH921 Addressable Multi-Criteria Fire Detector
The Siemens OH921 is an intelligent, addressable multi-criteria fire detector that combines both optical smoke and thermal sensors for fast, accurate detection. Designed for use with Siemens Cerberus PRO and Desigo Fire systems, the OH921 continuously analyzes air quality and temperature patterns using Siemens ASAtechnologyâ„¢ (Advanced Signal Analysis) to detect real fire conditions while minimizing false alarms.
This dual-sensor design makes the OH921 ideal for a wide range of commercial and industrial environments — from offices and schools to manufacturing spaces — where environmental changes like dust or steam can affect standard smoke detectors.
Built with a low-profile housing and 360° status LED for easy visibility, the OH921 installs quickly onto the standard DB-11 base and provides long-term reliability with minimal maintenance.
Key Features
- Dual-sensor design: optical smoke and heat detection
- Siemens ASAtechnologyâ„¢ for intelligent false-alarm reduction
- Compatible with Cerberus PRO and Desigo Fire systems
- 360° status LED and low-profile design
- Simple twist-lock installation on DB-11 base
- UL 268 7th Edition compliant