The Omron F3SG-4SRB1120-25 is a Type 4 safety light curtain from the F3SG-SR series, rated for hand protection with a 25 mm detection capability. The 20 mm beam pitch and 56 beams give it a 1120 mm protective height, covering a reach zone typical for press brakes or assembly station access. Operating range spans 0.3 m to 20.0 m, so it handles both close-up guarding and longer aisle monitoring without a separate lens set. Supply is 24 VDC. The IP65/IP67/IP67G rating means the housing and optics survive washdown and oil exposure — relevant for food, beverage, or machining lines where coolant mist is present. Blanking and muting functions are built in, so you can program fixed obstructions (a part fixture) or mute the curtain during a non-hazardous material pass without an external controller.
The 25 mm detection capability means the curtain catches a 25 mm diameter object (typically a finger or hand) reaching into the hazard zone — this is finger/hand protection per IEC 61496-2. The 1120 mm protective height is the actual sensing area; the total housing length is slightly longer, so verify bracket clearance. Beam pitch of 20 mm gives 56 beams, which determines the minimum object size the curtain resolves. Operating range of 0.3 m to 20.0 m covers both short-reach guarding and longer spans. The wide temperature tolerance (-30°C to 55°C) suits unheated warehouses or outdoor conveyor gantries. IP67G adds oil resistance — a step above standard IP67 for environments with cutting fluids or lubricants.