These Fireray® REFLECTIVE BEAM DETECTORS, from Space Age Electronics, are single units with an infrared transmitter and receiver. The signal generated in their transmitter element, and reflected by the prism back to the receiver element, is analyzed for the presence of smoke, while their internal microprocessors determine an alarm condition when a predetermined level is reached. Designed to be mounted so their beam projects 1'–2' below and parallel to the ceiling, thay have lateral detection up to 30' on either side of the beam, for up to 19,800 sq ft of coverage. Other features include calibrated obscuration test filters, three selectable alarm thresholds (25%, 35%, or 50%), alarm latching or auto reset, automatic gain control, 12 VDC or 24 VDC operation, and separate alarm and trouble contacts. UL/ULC listed. 8 1/4"H x 4 3/4"W x 4 1/2"D.
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