Edwards SIGA-HRS — Signature Series intelligent heat detector combining a 135 °F fixed-temperature element with a 15 °F per minute rate-of-rise element.
Heat detection is specified where smoke detection cannot be used: kitchens, loading docks and parking structures, where dust or steam are normal. The SIGA-HRS analyses its sensing elements on board against stored history, so the alarm decision is made at the detector; it keeps alarming stand-alone if loop communication fails.
- Alarms at 135 °F (57 °C) ambient, or on a rise above 15 °F (9 °C) per minute
- UL listed detector spacing 70 feet (21.3 m)
- Operating voltage 15.2 to 19.95 Vdc, 19 Vdc nominal
- 45 µA quiescent and in alarm at 19 V; 18 mA stand-alone alarm mode
- Operating environment 32 °F to 100 °F (0 °C to 38 °C), 0 to 93% RH
- One device address; twin red and green LEDs; UL, ULC, MEA and CSFM listed
SIGA-HFS is the part to confuse this with: same 135 °F alarm point, no rate-of-rise element. Edwards now publishes SIGA-HRD and SIGA-HFD as its current intelligent heat detectors, but they are a different generation rather than a drop-in: both are listed at 50 ft spacing against the 70 ft here, so a layout drawn on this detector needs more devices if re-equipped. Bases order separately: SIGA-SB, SIGA-RB relay, SIGA-IB isolator.
