Safety light curtain with 25 mm hand detection, 1905 mm height
The Omron F3SJ-B1905P25 is a Type 4 safety light curtain from the F3SJ-B series, designed for hand protection with a 25 mm detection capability. Its 1905 mm protective height and 20 mm beam pitch (94 beams total) create a detection zone that catches fingers and hands reaching into a hazard area — finger-protection class per IEC 61496-1. The 0.2 m to 7.0 m operating range suits it for guarding press brakes, robotic cells, and assembly stations where the emitter and receiver mount across a guarded opening.
The 25 mm detection capability means the curtain reliably detects a 25 mm diameter opaque object anywhere in the field — this is the standard hand-protection resolution. The 20 mm beam pitch is the center-to-center spacing between adjacent beams; tighter pitch gives finer detection but reduces the maximum range. With 94 beams across 1905 mm, the math checks out: (94 - 1) × 20 mm = 1860 mm, plus the housing offsets yield the full protective height. The 0.2 m minimum range lets you mount the pair close to the machine frame, while the 7.0 m maximum covers most single-side guarding spans. IP65 rating means the housings are dust-tight and protected against water jets — suitable for washdown environments in food processing or automotive assembly, though not for continuous submersion. Blanking and muting functions are built in: blanking lets you disable specific beams for workpiece pass-through without stopping the machine; muting temporarily suspends the curtain during a material transfer cycle. Both require external sensor inputs and a safety PLC or relay to validate the override conditions.
The F3SJ-B1905P25 carries an active lifecycle status — Omron still lists it as current production. If you are migrating an older F3SN or F3SJ-A series curtain, the F3SJ-B shares the same 24 VDC supply and standard mounting bracket pattern, but verify the connector pinout and configuration tool compatibility before swapping.