System Sensor D4120 Duct Smoke Detector 4 Wire

System Sensor D4120 patented sampling tube installs from front or back of the detector with no tools required, Increased wiring space with a newly added ¾-inch conduit knockout. Furthermore, one easy-access Test/Reset button and improved led status. Also, patented interconnect feature for multi-fan shutdown.

A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance. Furthermore, an improved cover design isolates the sensor head from the low-flow feature for simple maintenance.

System Sensor D4120 4-Wire Photoelectric, integrated low-flow technology. Also, air velocity rating from 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/sec)Versatile mounting options: square or rectangular configuration.

An easy-access Test/Reset button makes it possible to test the unit with the cover on. Additionally, three DIP switches can be used to configure field selectable settings: cover tamper delay, number of sensors to be controlled, and shut down on trouble option.

Power boars have two LEDs. They can be used to indicate the status of connected sensors, as well as a quick reference imprinted on the cover explains the LED status indications.

Features / Specifications

• 100 to 4000 ft./min. Air Velocity
• 15 sec. Response Time
• -4°F to 158°F Operating Temp
• 0% to 95% relative humidity