Sensor Heads-Blocks, Photoelectric Fiber Optic: Type - Modular Sensor; Sensor Type - Photoelectric Fiber-Optic; Mounting Style - Collar Fiber Mounting; Range, Thru-Beam Mode - 0.063" Fiber, 10" (250mm), 0.125" Fiber, 40" (1000mm); Range, Diffuse Reflective Mode - 0.063" Fiber, 0.80" (20mm), 0.125" Fiber, 4.5" (115mm); Response Time ON - AC 20ms, DC 20ms; Response Time OFF - AC 30ms, DC 22ms; Output Mode - Light/Dark Operate; Manufacturer Series - E51 Modular