The Edwards EST SIGA-H2D is an intelligent addressable fixed-temperature heat detector for Signature Series loops, providing dual reporting with a 135°F alarm threshold plus a separately programmable Emergency temperature threshold for temperature warnings in critical spaces. It uses next-generation thermistor sensing with continuous self-diagnostics, electronic addressing, and automatic device mapping to help speed commissioning and maintain device location integrity.

Key Specifications:
Type: Intelligent addressable fixed-temperature heat detector with dual reporting
Core Function(s): Fixed 135°F (57.2°C) alarm reporting plus programmable Emergency temperature reporting (35°F to 125°F in 5°F steps); no rate-of-rise function
Loop/Protocol: Signature SLC (Signature loop controllers in EST4, EST3, and EST3x)
Power: 15.20 to 19.95 VDC from loop; 51 µA normal; 68 µA in alarm
Indicators/UI: Bicolor green/red status LED; electronic addressing; sensor markings for easier test identification

Compatible Bases & Accessories:
SIGA-SB – Standard detector mounting base
SIGA-SB4 – 4-inch base with trim skirt
SIGA-RB – Relay base
SIGA-RB4 – 4-inch relay base with trim skirt
SIGA-IB – Fault isolator base
SIGA-IB4 – 4-inch fault isolator base with trim skirt
SIGA-AB4G – Audible (sounder) base for fire detectors
SIGA-AB4G-LF – Low-frequency audible (sounder) base
SIGA-AB4GT – Audible (sounder) base
SIGA-LED – Remote alarm LED (use with standard base only)
SIGA-TS4 – Trim skirt (included with 4-inch bases)

System Compatibility: Signature Series heat detectors are compatible only with Signature loop controllers used in EST4, EST3, and EST3x systems.