24 alarm for sale, brand-new and used.

System Sensor 4WT-B 4-Wire Photoelectric Smoke Detector with base and built in 135 Degree Heat Detector

EST's SIGA-PS Intelligent Photoelectric Smoke Detectors are compatible only with EST's Signature Loop Controller. Photoelectric detectors have a wide range of sensing capabilities but are best suited for detecting slow, smoldering fires. Automatic day/night sensitivity adjustment.

System Sensor D4120 4 Wire Photoelectric Low-Flow Duct Smoke Detector The SYSTEM-SENSOR-D4120 4-wire photoelectric, low-flow, duct smoke detector senses smoke in the most challenging conditions, operating in airflow speeds of 100 to 4,000 feet per minute, temperatures of -4 degrees F to 158 degrees F, and a humidity range of 0 to 95 percent (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance.

NEW GE Aritech 2000 Series Optical Smoke Detector Sensor DP2051 GP201061 24V Brand New Features: Remote test capabilities Remote signalling capabilities Optical sensor with field exchangeable optical chamber Easy numeric addressing (1-128) Enhanced communication protocol Full diagnostic self testing Polarity ins

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+24V Smoke Detector Model-OSD243

+24V Smoke Detector

Viking J-1 Alarm Valve Sprinkler Fire Water Clapper Reverse Flow Pipe 3" 08237 The Viking Model J-1 Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. The valve is designed to initiate an alarm during a sustained flow of water (such as the flow required by an open sprinkler) by operating an optional water motor alarm and/or alarm pressure switch. LAST ONE!!!!