SIGA-OSD

The Edwards SIGA-OSD is an intelligent optical smoke detector from the Signature Optica Series, featuring multi-criteria photoelectric sensing technology for early fire detection while rejecting nuisance alarms from cooking particulates or dust.
It uses dual optical wavelengths and advanced algorithms via an on-board microprocessor for precise smoke analysis, automatic sensitivity adjustment, and seamless integration with EST-3, Signature Loop, and compatible fire alarm control panels.
Key Specifications
Feature
Specification
Display
Dual-color LED (Green: Normal / Red: Alarm)
Sensing Method
Optical (Photoelectric) Multi-criteria
Sensitivity Range
0.5 to 4.36%/ft. (1.6 to 13.6%/m)
Device Capacity
Up to 250 addresses per Signature Loop
Communication
Signature Data Circuit (15.2–19.95 VDC)
Standard Functions
Self-diagnostics, Nuisance rejection, Day/Night sensitivity, Pre-alarm settings
Mounting Bases
Standard, Relay, Fault Isolator, Audible
Aux Input
Environmental compensation sensor
Power Supply
15.2–19.95 VDC (loop-powered)
Operating Temp
0°C–49°C (32°F–120°F) (20%–93% humidity)