Edwards Signaling SD-2W SD Series SuperDuct 2-Wire Duct Smoke Detector, Photoelectric, 16-30VDC Operating Voltage, 50-750 Ohm Alarm Impedance

Protect building occupants and HVAC infrastructure with the Edwards Signaling SD-2W SuperDuct duct smoke detector — a slim, high-performance solution for reliable air-handling unit monitoring. This SuperDuct photoelectric detector delivers early smoke detection using differential sensing to prevent gradual environmental changes from causing nuisance alarms, keeping your security and fire monitoring systems accurate. With 16–30VDC operating voltage and 50–750 ohm alarm impedance, the SD-2W integrates easily into existing fire panels, building automation, and surveillance systems. Designed for commercial and industrial environments, its removable dust filters, conformally coated circuit boards, and optional water-resistant gaskets reduce maintenance and extend service life in contaminated or humid ducts. The compact form factor and snap-together assembly speed installation and lower labor costs, while onboard intelligence supports stable sensitivity within the 0.79%–2.46% obscuration range for dependable performance. Ideal for data centers, hospitals, office high-rises, and manufacturing facilities requiring continuous HVAC monitoring, the Edwards Signaling SD-2W balances advanced detection with practical maintenance. Add this SuperDuct detector to your security and fire protection strategy — contact sales or order today to improve duct smoke surveillance and reduce false alarms.

• Slim, low-profile design reduces installation time and fits tight HVAC ducts for faster field deployment
• Photoelectric sensing with differential compensation minimizes false alarms and delivers stable, drift-free monitoring
• Broad 16–30VDC compatibility and 50–750 Ω alarm impedance for seamless integration with existing fire and building control systems
• Removable dust filters and conformally coated circuitry cut maintenance time and extend service life in contaminated air streams
• Tool-free service access lets technicians clean and reassemble detectors quickly, reducing downtime and service calls
• Robust construction with optional water-resistant gaskets improves reliability in demanding mechanical and industrial environments