The Signature Series smoke detectors bring advanced sensing technology to a practical design that increases efficiency, saves installation time, cuts costs, and extends property protection capabilities. Continuous self-diagnostics ensures reliability over the long-haul, while the latest thermister technology makes these detectors ideal wherever dependable heat detection is required. The SIGA-HRD is an intelligent fixed temperature/rate-of-rise fire detector. It monitors the temperature of the surrounding air and analyzes the data from the sensor to determine whether to initiate an alarm. The rate-of-rise heat function quickly detects a fast, flaming fire. The fixed-temperature heat function detects fire when the air temperature near the detector exceeds the alarm point. • Next Generation Heat Sensing Technology • 135 °F (57 °C) fixed temperature alarm point (HRD and HFD) • 15 °F (9 °C) per minute rate-of-rise alarm point (HRD) • Uses existing wiring • Automatic device mapping • Sensor Markings Provide Easy Testing Identification • Up To 250 Total Signature Devices Per Loop • Non-volatile memory • Electronic addressing • Bicolor (green/red) status LED • Standard, relay, fault isolator, and audible mounting bases • 50 foot (15.2 meter) spacing