The Omron F3SG-4SRB0840-25-F is an active-production light curtain from the F3SG-SR series, rated for hand protection with a 25 mm detection capability. Its 840 mm protective height and 42 beams at 20 mm pitch cover a wide access area, and the 0.3–20 m operating range suits both tight machine guarding and longer perimeters. The IP65/IP67/IP67G enclosure handles washdown environments, oil exposure, and dust — no extra cover needed for food or automotive cells.
What the ratings mean for fit
The 25 mm detection capability targets hand and finger safety per IEC 61496 — not arm or body. That means the curtain goes closer to the hazard than a 30 mm or 40 mm unit, reducing the minimum safe distance. The 20 mm beam pitch and 42 beams give a dense curtain that catches a hand at any angle. The 0.3 m minimum range lets you mount it right at the machine opening; the 20 m maximum covers long conveyor entries without a second set of heads. The IP65/IP67/IP67G rating is the deciding factor for wet or oily lines. IP67G adds oil resistance to the standard IP67 water immersion — common in machining centers where coolant mist settles on the housing. The -30°C to 55°C operating range covers cold storage and unheated factory floors; no heater option needed down to -30°C. Blanking and muting functions are built in — no external controller required for fixed or floating blanking to ignore conveyor or workpiece obstructions, or for muting sensors to bypass the curtain during material pass-through. That saves panel space and wiring compared to older two-box architectures.