What this light curtain does — and the rating that decides the fit
The Omron F3SJ-A0515P20 is a type-4 safety light curtain from the F3SJ-A series, built for finger and hand protection per IEC 61496. Its 20 mm detection capability means it catches fingers reaching into the hazard zone — that 20 mm figure is what drives your safety distance calculation (per ISO 13855), not the beam pitch alone. The 15 mm beam pitch and 34 beams give a 515 mm protective height, covering a vertical zone just over half a meter. Operating range spans 0.2 m to 9.0 m, so it fits both tight machine openings and wider access areas.
Deployment context — where the IP65 and features matter
IP65 rating means the sensor body and optics withstand washdown — suitable for food-and-bev lines or machining centers where coolant spray is routine. Blanking and muting functions are built in, so you can let a workpiece pass through the beam field without tripping the safety circuit, while still protecting personnel access. That avoids needing an external bypass module, simplifying the safety PLC wiring.
What the ratings mean for your safety circuit
The 24 VDC supply is standard for safety light curtains, matching most safety relay and PLC input cards. Operating temperature from -10°C to 55°C covers typical factory floor conditions without derating. The 20 mm detection capability classifies this as finger protection (not just hand detection), which is the stricter requirement — if your risk assessment calls for finger protection, this meets it. The 515 mm protective height is the actual guarded zone; make sure your machine opening does not exceed that height, or you will need a second curtain stacked.