Standalone Detection Smoke Detectors 517 Series The 517TCS/517TCSB Series provides the 3 pulse temporal pattern evacuation tone as a standard feature. The smoke alarm operates on the light scattering principle, using a pulsing LED light source and a photodiode sensor in a fully screened sensing chamber. Upon activation, the alarm will emit a local audible signal and activate the high intensity strobe. They are designed for ceiling or wall mounting on a 4" (102mm) square mounting box using a universal mounting plate, and have a quickdisconnect plug connection. Features and Specifications • Quadra-port smoke entry • 3 position functional test switch • Solid-state LED condition indicator • Quick disconnect wiring harness • V DC alkaline battery back-up 9 • Tandem connection up to 6 alarms per system • Dry contacts will activate from the tandem wire • Temporal pattern evacuation sounding device • 100dB @ 1m/90dB @ 10ft. • perating temperature range: 40ºF to 100ºF O (4.4ºC to 37.8ºC) Smoke Detector Smoke Detector with 9V DC Battery Backup 1AC Nominal Sensitivity 2.5% Obscuration Auxiliary Relay (Standard) 1 Form C (1 A @ 24V DC; 0.6 A @ 125V AC) Weights and Dimensions Approx. Shipping Weight (lb.) FIRE ALARMS Edwards 517 Series Single Station Smoke Detectors feature a solid state piezo signal and a strobe with "FIRE" lettering.