snippet: Photo Beam 60/120M Quad 1Ch. The ISC-FPB1-W60QS single channel quad beam detector with separate transmitter and receiver. The detector uses four pulsed infrared beams that are designed to activate an alarm when all four beams are simultaneously blocked. False alarm immunity is increased by the utilization of four beams compared to single or dual beam models. The detector series also features interlocked upper and lower beams, signal voltage LED, and optional environmental discrimination circuitry.

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