Description

System Sensor 1412 and 1424 dual-chamber ionization smoke detectors utilize state-of-the-art, unipolar sensing chambers. Also, these detectors come designed to provide open area protection, and to be use with UL-listed 4-wire control panels. Besides, the System Sensor 1412 for 12-volt panels operates at 12VDC, and the 1424 for 24 volt panels operates at 24VDC. The detectors’ operation and sensitivity can be test in place. These detectors come listed to UL 268 and are latching-type system detectors.

An LED on the detector provides a local indication of the detector’s status. If power is apply to the detector, and the detector is functioning properly in standby, the status LED will blink every 10 seconds. In alarm, the LED will be latched on continuously until the detector is reset.

In general, each detector contains one Form A (SPST-NO) contact for connection to the alarm-initiating circuit, and one Form C (SPDT-NO/NC) set of auxiliary contacts. Supervision of detector power is accomplish by installing a Power Supervisory End-of-Line Relay Module (A77-716) at the end of the detector power loop. When power is apply to and through the detectors, the EOL Power Supervisory Module is energize. Its relay contacts close and provide a closed series circuit in the control panel’s alarm-initiating loop. A power failure or a break in the detector power loop de-energizes the EOL Module. The relay contacts open and trigger a trouble signal at the control panel.