SIGA-HRD

The Edwards SIGA-HRD is an intelligent fixed temperature and rate-of-rise heat detector from the Signature Series, featuring next-generation thermistor sensing technology for reliable detection of both rapid flaming fires and slow-smoldering fires.
It monitors surrounding air temperature continuously, triggering alarms via 15°F (9°C) per minute rate-of-rise or 135°F (57°C) fixed temperature thresholds, with advanced signal processing and self-diagnostics for Signature Loop integration.
Key Specifications
Feature
Specification
Display
Dual-color LED (Green: Normal / Red: Alarm)
Sensing Method
Fixed Temp + Rate-of-Rise Heat
Fixed Temp Alarm
135°F (57°C)
Rate-of-Rise Alarm
15°F/min (9°C/min)
Device Capacity
Up to 250 addresses per Signature Loop
Communication
Signature Data Circuit (SLC)
Standard Functions
Self-diagnostics, Automatic device mapping, Non-volatile memory
Mounting Bases
Standard, Relay, Fault Isolator, Audible
Aux Input
Environmental compensation
Power Supply
15.2–19.95 VDC (loop-powered)
Operating Temp
0°C–49°C (32°F–120°F, 10-93% RH)