Edwards EST SIGA-DDOS Optica Duct Detector

The Edwards EST SIGA-DDOS Optica intelligent duct smoke detector provides addressable photoelectric smoke detection for HVAC ducts on Signature Series loops, with wide 100 to 4,000 ft/min air velocity coverage and environmental compensation for stable, drift-free sensitivity. Its shallow housing, removable Optica tube assembly, and conformally coated electronics simplify installation and maintenance, while the built-in Form C relay can shut down fans or HVAC equipment on alarm. Key Specifications: Type: Intelligent addressable Optica duct smoke detector Core Function(s): Continuously samples duct air and initiates alarm and auxiliary control when smoke exceeds the programmed sensitivity Loop/Protocol: Signature SLC Power: 15.2 to 19.95 VDC; 50 μA standby, 60 μA alarm Indicators/UI: Green LED (normal), red LED (alarm), amber LED (test); magnet-activated test switch on housing Sensing: Photoelectric (light-scattering) Optica sensing, 1.5% to 4.5%/ft obscuration range Operating Range: 100 to 4,000 ft/min air velocity; -20 to 158 °F (-29 to 70 °C), 0 to 93% RH noncondensing Alarm Relay: One Form C auxiliary relay, 3 A @ 30 VDC or 120 VAC Compatible Bases & Accessories: SD-T8 – 8 in sampling tube SD-T18 – 18 in sampling tube SD-T24 – 24 in sampling tube SD-T36 – 36 in sampling tube SD-T42 – 42 in sampling tube SD-T60 – 60 in sampling tube SD-T78 – 78 in sampling tube SIGA-LED – Remote alarm LED SD-TRM – Magnetic remote test/reset station with alarm LED SD-TRK – Keyed remote test/reset station with alarm LED SD-MAG – Test magnet kit SD-VTK – Air velocity test kit SIGA-DDOSIB – Replacement interface board SIGA-DDOS-ROT – Replacement optical sensor tube assembly DDOS-RET – Replacement exhaust tube System Compatibility: Compatible with Edwards Signature loop controllers and Signature Series fire alarm control panels. Replaces: SIGA-SD