SYSTEM SENSOR D4120 Photoelectric Universal Smoke Detector

System Sensor D4120 photoelectric smoke detector is designed to detect smoke in large commercial, industrial or manufacturing facilities.

Features:

• It features a pivoting housing to fit both square and rectangular footprints and mount on rectangular or round ductwork.
• This smoke detector can sense smoke in the most challenging conditions, operating in air velocities of 100 to 4000 feet per minute, temperatures of - 4 to 158 deg F, and a humidity range of 0 to 95 percent (non-condensing).
• It comes with a TEST / RESET button for easy access to the unit and improved LED status for quick monitoring.
• It uses a 4-wire photoelectric technology with an improved alarm system that signals when smoke is detected in the air duct so that appropriate measures can be taken to shut off fans, blowers or air handling systems.
• It uses a patented interconnect feature (up to 50 detectors in the loop) for multiple fan shutdown
• It comes with built-in short-circuit protection to prevent shocks from operator wiring errors.
• Model D4120W, a smoke detector with a water-tight enclosure, is also available.

Standards and Approvals:

• UL / ULC
• FM
• CSFM

Frequently Asked Questions:

Q. What is the purpose of a sampling tube?

A. The sampling tube comes with holes to extend throughout the duct. It can draw air from a protected space back to a sensing chamber and detect smoke in the HVAC system with the primary purpose of shutting the system down immediately.

Q. What is a sampling tube end cap?

A. A sampling tube end cap is designed to create the proper airflow to the sensor of the duct smoke detector. Once the sampling tube length adjustments are made, the end cap is plugged into the sampling tube for proper operation.

Q. How to test a smoke detector?

A. One of the measures that can be taken to test a smoke detector is to spray aerosol smoke into the duct through a 1/4 inch hole for 5 seconds. It takes up to 2 minutes for the duct smoke detector to alarm. If the detector alarms, the air is flowing through the detector.