Product Details
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 Space Age SSU-WP-1 – Weatherproof enclosure option for outdoor or drip-prone installs
System Compatibility: Compatible with Edwards Signature loop controllers and Signature Series fire alarm control panels.
Replaces: SIGA-SD