Overview The Signature Optica Series SIGA-OSHD smoke detector brings advanced optical sensing technology to a practical design that increases efficiency, saves installation time, cuts costs, and extends life safety and property protection capabilities. Continuous self-diagnostics ensure reliability over the long-haul, while environmental compensation helps reduce maintenance costs. The SIGA-OSHD provides an optical smoke sensor and a rate-of-rise heat sensor with a fixed temperature setting. Together these sensors efficiently detect smoldering fires, as well as fast flaming fires. Like all Signature Optica Series detectors, the SIGA-OSHD is an intelligent device that gathers analog information from multiple optical sensors, converting this data into digital signals. Utilizing dual optical wavelengths combined with multiple detection angles, the SIGA-OSHD differentiates particles that are not representative of actual smoke. Particle data is input into digital filters which feed a series of ratios removing signal patterns that are typical of nuisance sources, thus reducing unwanted alarms. To make an alarm decision, the detector’s on-board microprocessor measures and analyzes all optical sensor readings and compares this information to preprogrammed settings. Features • Multi-criteria optical smoke sensing technology • Integrates optical smoke with rate-of-rise heat sensing • Wide 0.5 to 4.36 %/ft. (1.6 to 13.6 %/m) smoke obscuration • Integrated nuisance rejection reducing unwanted alarms from general cooking particulates • Uses existing wiring • Listed to UL 268 7th edition • Automatic device mapping • Sensor Markings Provide Easy Testing Identification • Up To 250 Total Signature Addresses Per Loop • Two levels of environmental compensation • Two levels of dirty detector warning • Twenty pre-alarm settings • Five sensitivity settings • Non-volatile memory • Electronic addressing • Automatic day/night sensitivity adjustment • Bicolor (green/red) status LED • Standard, relay, fault isolator, and audible mounting bases