What it is and what it does
The Omron F3SG-4SRB0920-25-F is a Type 4 safety light curtain from the F3SG-SR series, rated for hand protection with a 25 mm detection capability. Its 46 beams at 20 mm pitch cover a 920 mm protective height, and the operating range spans 0.3 m to 20.0 m — enough for most machine guarding zones without needing a mirror set. Built for 24 VDC supply, the unit carries IP65/IP67/IP67G ingress protection, meaning it handles washdown environments and oil exposure. The IP67G suffix indicates additional oil resistance, which is relevant for machining centers or press lines where coolant mist is present.
Key ratings and what they mean for fit
The 25 mm detection capability is the beam resolution — objects larger than that break the beam and trigger the safety output. This places the curtain in the hand-protection class, not finger or palm, so it suits access guarding around robot cells, assembly stations, and palletizers where a hand entering the field must stop the machine. Blank and mute functions are built in, so you can program fixed obstructions (like a fixture post) out of the detection zone and temporarily override the curtain during a workpiece pass-through without external bypass modules. Temperature range is -30 °C to 55 °C, which covers unheated warehouse bays and refrigerated areas. The 20 m range gives flexibility for long corridors or wide openings without cascading multiple units.