The Omron F3SJ-B1425N25 is a type-4 safety light curtain from the F3SJ-B series, designed for hand protection with a 25 mm detection capability. That 25 mm figure means it catches a hand or finger reaching into the hazard zone — it's rated for hand detection per the spec, not fingertip, so it suits perimeter and access guarding where a 14 mm resolution isn't needed. The 1425 mm protective height covers a tall opening, and the 20 mm beam pitch with 70 beams gives a dense enough curtain to stop a hand at any height across that span.
The operating range runs from 0.2 m to 7.0 m, so it fits both tight machine guarding and wider cell perimeters. IP65 rating means the emitter and receiver housings handle washdown and dust — typical for food, beverage, or packaging lines where you hose down the guarding. Blanking and muting functions are built in, which lets you program out fixed obstructions (like a conveyor frame) or temporarily bypass the curtain during a pallet pass without stopping the line.