Edwards SIGA-OSDI Intelligent Optical Smoke Detector EN54

The Edwards SIGA-OSDI is an intelligent optical smoke detector from the Signature Series range for the Edwards EST4 life safety control platform. It uses a multi-criteria optical smoke sensor, and Edwards describes it as the workhorse of modern fire alarm systems.

Like other Signature Series detectors, it has its own on-board processing. It tracks sensor readings over time and compares them with known fire signatures, so it only raises an alarm when a match is found. This helps it tell the difference between a harmless puff of dust and real smoke.

Key features

• Multi-criteria optical smoke sensor
• On-board processing with fire-signature algorithms to reduce unwanted alarms
• Self-diagnostics, with results stored in the device's non-volatile memory
• Automatic dirty or defective detector reporting, plus sensitivity measurement
• Supports automatic device mapping by the Signature loop controller
• Shielded wiring is not required, and existing wiring can be used in most retrofits

Technical specifications

• Model: SIGA-OSDI
• Type: intelligent optical smoke detector (no integrated isolator; the SIGI-OSDI is the isolator version)
• Protocol: Edwards Signature Series
• Loop controllers: 3-SSDC2-E / 3-SDDC2-E on EST4
• Data sheet reference: E85001-0712