The Edwards EST SIGA-OSD is an intelligent optical smoke detector for Signature Series loops. It uses dual-wavelength, multi-angle sensing with digital filtering to help distinguish real smoke from nuisance sources, and it supports environmental compensation, self-diagnostics, and a clear green/red status LED.

Key Specifications:
Type: Intelligent addressable optical smoke detector
Core Function(s): Photoelectric smoke detection with integrated nuisance-alarm reduction
Loop/Protocol: Signature Series SLC
Power: 15.20 to 19.95 VDC
Indicators/UI: Bi-color status LED
Operating Range: 32 to 120 °F; 0 to 93% RH, non-condensing
Notes: Five sensitivity settings with day/night and pre-alarm options; dirty detector warnings