Edwards EST (SIGA-HRS) Intelligent Fixed Temp Heat Detector

The Edwards SIGA-HRS is a Signature Series intelligent addressable heat detector. Specifically, it combines a 135°F fixed-temperature element with a rate-of-rise sensing element. As a result, the detector responds to either a sudden temperature rise or a sustained high temperature.

Status: The SIGA-HRS has been discontinued by Edwards. Furthermore, it is replaced by the Edwards SIGA-HRD intelligent heat detector. Therefore, for new installations or stock replenishment, please consider the SIGA-HRD as the current-production equivalent.

How the Edwards SIGA-HRS Detects Heat

First, the detector continuously samples the ambient temperature at its sensing element. In addition, the panel evaluates both the absolute temperature and the rate of change. As a result, an alarm reports when either condition crosses its threshold.

Furthermore, the SIGA-HRS communicates over the Edwards Signature data circuit (SDC). Therefore, the panel can poll the device individually for status, sensitivity, and alarm history.

Where Heat Detectors Make Sense

Specifically, heat detectors are best suited to environments where smoke detectors would generate false alarms. Examples include:

• Mechanical rooms with dust and fumes
• Kitchens and back-of-house service areas
• Parking garages and loading docks
• Attics, electrical rooms, and similar spaces

However, heat detectors respond more slowly than smoke detectors to most fires. Therefore, they should be used only where smoke sensing is impractical.

Specifications

• Function: Addressable heat detector — fixed temperature plus rate-of-rise
• Communication: Edwards Signature Data Circuit (SDC)
• Fixed temperature threshold: 135°F (57°C) nominal
• Rate-of-rise threshold: 15°F (8.3°C) per minute, nominal
• Housing: White plastic, Signature Series form factor
• Compatible bases: SIGA-SB, SIGA-IB, and other Signature Series bases — verify per your installation
• Status: Discontinued — replaced by the Edwards SIGA-HRD

Compatible Panels

The SIGA-HRS was originally specified for Edwards Signature-loop panels. Examples include:

• Edwards EST3
• Edwards QuickStart
• Edwards iO64 / iO500 / iO1000

However, before ordering, please confirm the SIGA-HRS works with your specific panel firmware. Newer panels may require the current-production SIGA-HRD instead.

Order or Cross-Reference the Edwards SIGA-HRS

Life Safety Consultants can help cross-reference legacy Edwards SIGA-HRS detectors to current-production replacements. To check stock or transition to the SIGA-HRD, call 1-888-557-0558. Alternatively, email sales@lifesafetycom.com.

For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com