What this light curtain does
The Omron F3SJ-B1025P25 is a Type 4 safety light curtain rated for hand detection with a 25mm detection capability. It throws 50 beams at a 20mm pitch across a 1025mm protective height, covering a reach zone from 0.2m out to 7.0m. That 25mm detection rating means it catches a hand or finger-sized object entering the field — it's sized for point-of-operation guarding, not just presence sensing at a distance. Runs on 24VDC supply, which is standard for safety circuits in most panels.
The 25mm detection capability is the key spec for fit — it's the smallest object the curtain reliably sees. At 20mm beam pitch with 50 beams, the resolution is tight enough that a hand reaching past the field trips the output before fingers touch the hazard. The 7.0m maximum range means you can mount the emitter and receiver across a wide machine opening, but the 0.2m minimum blind zone means you need some standoff from the guarded point. Built-in blanking and muting functions give you flexibility: blanking lets you ignore fixed obstructions (like a machine frame) inside the field, and muting suspends the curtain temporarily when a workpiece passes through on a conveyor. These are programmable features, not just hardware jumpers, so you'll need the configuration tool or a compatible safety controller to set them up.
No official successor or alternate MPN is listed, so the F3SJ-B1025P25 is the part to specify.