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417484 and 417485
Edwards EST 5551F Heat Detector model 5551F PLUG-IN INTELLIGENT FIXED TEMPERATURE SENSOR WITH COMMUNICATION
Supports compatible two-wire smoke detectors
Alternately
sensor type (such as photoelectric or ionization) and an analog value
Siemens OP121 Conventional Photoelectric Smoke Detector M500SF 417484 and 417485The microprocessor controlled, self diagnostic circuitry contained in the Siemens photoelectric (conventional) smoke detector, Model OP121, eliminates an installers need of using burdensome sensitivity test equipment. The Model OP121 auto sensitivity feature originates from its internal, self monitoring circuitry, providing dynamic verification of sensitivity and or required maintenance. This detector type is commonly found on the following Siemens
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