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The Edwards EST Smoke Detector 2251FB
Model OP121 is UL 268
system acknowledge or drill switch
The Edwards EST 5251FB is an intelligent Heat Detector
self-diagnostic circuitry contained in the Siemens photoelectric (conventional) smoke detector
System Sensor M502M Addressable Interface Module OP121 The Edwards EST Smoke DetectorThe M502M Interface Module is intended for use in intelligent, two wire systems, where the individual address of each module is selected using the built in rotary decade switches. This module allows intelligent panels to interface and monitor two wire conventional smoke detectors. It transmits the status (normal, open, or alarm) of one full zone of conventional detectors back to the control panel. All two wire detectors being monitored must be UL