The DS455Q is a quad photoelectric detector that consists of separate transmitter and receiver. It can be used both indoors and outdoors. The transmitter emits an invisible infrared beam to the receiver. If the beam is broken, the receiver signals an alarm. This detector uses four pulsed infrared beams that are designed to activate an alarm only when all four beams are simultaneously blocked. The DS455Q also features interlocked upper and lower beams, signal voltage LED, and selectable environmental discrimination circuitry.
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