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Link lite black max ll-max-18-as light curtain receiver
Used Link Lite Black Max Infrared Safety Light Curtain Receiver.
Model: LL-MAX-18-AS Key not included.
Obj. Sen.: 0.95 Response Time: <=22ms Range: to 50 feet
Light curtain controllers send stop signals to machines that are guarded by light curtains, photoelectric transmitters that project an array of synchronized, parallel infrared light beams to a receiver.
http:// /archives/plant_safety/jan02/link_black_max.htm