System Sensor

Proudly Represented In: FL – MS

Formed in 1984 to focus on the fire alarm systems market, today System Sensor is one of the largest manufacturers of fire detection and notification products in the world. A specialist in smoke detection technology, we place a high premium on research and development. The result is a line of products that are reliable, sophisticated and designed for real-world applications.

System Sensor is a global company with local expertise. Our commitment is to serve the needs of the growing worldwide fire alarm market. It is a commitment we back with sales, service and manufacturing sites located close to our customers. We know the importance of understanding local markets and fire codes. Whether needed in China, Chile, Korea, or California – in schools, homes, factories or telecommunications facilities – System Sensor products provide world-class fire and smoke detection.

For product details and contact information, visit

Cross References:

Links to Product Information:

HVAC Product Overview

D4120 – Duct Smoke Detector

D4120W – Watertight Duct Smoke Detector

D4240 – 4-Wire Photoelectric Duct Smoke Detector

Accessories – Duct Smoke Detectors

Duct Smoke Detector 2:1 Capability

Testing and Maintenance Guide

Frequently Asked Questions