Siemens OH921 Multi-Criteria Fire Detector

The Siemens OH921 is an intelligent, addressable multi-criteria detector that incorporates both optical and thermal sensors, using neural network signal processing to deliver enhanced detection across a wide range of combustion products. UL 268 7th Edition listed, it can be field-programmed as rate-of-rise (15°F/min) or fixed-temperature, includes built-in ISOtechnology isolation, and features a tri-color 360-degree status LED. Compatible with the Model 8720 DPU programmer and DB-11 series mounting bases.