NOTIFIER FSI-851 Fire Alarm Ionization Smoke Detector Head provides highly reliable fire detection for commercial life-safety systems. This advanced sensor head utilizes ionization technology to identify the earliest stages of combustion, ensuring rapid response times in critical environments.

• Operating Voltage Range: 15 to 32 VDC
• Maximum Standby Current: 300 µA at 24 VDC
• Operating Temperature: 32°F to 120°F (0°C to 49°C)
• Relative Humidity: 10% to 93% non-condensing
• Dimensions: 2.0 inches in height with a 4.1-inch diameter

Compared to legacy detector models, the FSI-851 offers superior stability and reduced false alarm sensitivity, making it a more dependable choice for modern fire protection arrays. Its streamlined design integrates seamlessly into existing Notifier fire alarm loops, ensuring full compatibility with contemporary professional life-safety infrastructure.

Precision Sensing Engineering

The FSI-851 detector head is engineered for consistent performance, featuring a dual-source ionization chamber that reacts precisely to smoke particles. By leveraging sophisticated digital communication protocols, this unit maintains constant status reporting to the fire alarm control panel, satisfying the rigorous demands of safety installations and local regulatory codes.