SYSTEM SENSOR D4S Duct Smoke Detector, 4-wire, Photoelectric, Sensor Only

The SYSTEM SENSOR D4S is a 4-wire photoelectric duct smoke detector that includes integrated low-flow technology. It operates effectively with air velocities ranging from 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/sec) and supports both square and rectangular duct mounting.

This sensor features a plug-in design that enhances false alarm immunity and uses the latest sensing technology. Its patented sampling tube can be installed from the front or back of the detector without tools, and the unit provides increased wiring space with a 3/4-inch conduit knockout.

The detector includes an easy-access Test/Reset button, improved LED status indicators, and patented interconnect capability for multi-fan shutdown. It has two DPDT Form-C relay contacts, works on 24 V AC/DC or 120 V AC power, and maintains backward compatibility with existing Innovair products and remote accessories.