Edwards Signaling, 521NCRXT, 2-Wire Conventional Photoelectric Smoke Detector, 8.5-33VDC
Edwards brand 500 Series two-wire conventional photoelectric smoke detectors bring together trusted technology and a full line of features that meet the demands of every type of application. The 500 offers sounders in two-wire applications, specifically to meet residential code requirements. Edwards is also proud to offer proven technology like CleanMe dust compensation, field replaceable optical chambers, and self-diagnostics. CleanMe is only available on the 500 2-wire models and will communicate with compatible FACPs when servicing is required.500 Series detectors work on a light-scattering principle. A pulsed infrared light emitting diode serves as the light source, and a high-speed photo diode as the sensing element. This design has superior protection against nuisance alarms caused by dust, insects, RF interference, and ambient light. The proprietary optical chamber is field replaceable. In the event of a confirmed alarm the LED will light continuously. The unit indicates trouble by flashing the LED every second. This meets the NFPA 72 field sensitivity testing requirements. All wiring terminates in clamp-type screw terminals. The detectors mount to a standard single-gang electrical box, a four-inch octagonal, four-inch square electrical box, or WIREMOLD No. 5739 fixture box.