Edwards EST SIGA-SD Intelligent Duct Smoke Detector

NOTE: This part is discontinued. Replace with: SIGA-DDOS. The Edwards EST SIGA-SD intelligent duct smoke detector provides addressable photoelectric smoke detection for HVAC ducts on Signature Series loops, using environmental compensation and differential sensing for stable, drift-free sensitivity. Its shallow housing fits tight mechanical spaces, while removable filters, conformally coated electronics, and a built-in Form C relay simplify maintenance and allow direct fan or HVAC equipment control on alarm. Key Specifications: Type: Intelligent addressable duct smoke detector Core Function(s): Samples HVAC 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; 45 µA standby, 45 µA alarm (18 mA standalone alarm) Indicators/UI: Green LED (power/normal), red LED (alarm), magnet-activated test switch on housing Sensing: Photoelectric light-scattering; 0.79 to 2.46 %/ft obscuration sensitivity range Operating Range: 100 to 4,000 ft/min duct air velocity; -20 to 158 °F (-29 to 70 °C); 10 to 93% RH noncondensing Alarm Relay: One Form C auxiliary relay, 2.0 A at 30 VDC (resistive) 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 SD-PH – Protective housing for high-humidity environments 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 SD-GSK – Cover gasket kit SIGA-SDPCB – Replacement PCB and Signature sensor kit System Compatibility: Compatible with Edwards Signature loop controllers and Signature Series fire alarm control panels.