What this part is and what it guards
The Omron F3SJ-B1825N25 is a safety light curtain from the F3SJ-B series, designed for hand protection in machine guarding applications. Its 25mm detection capability means it reliably detects fingers and hands reaching into a hazard zone, matching the requirements for hand-protection per IEC 61496. The 20mm beam pitch and 90 beams create a detection plane covering a 1825mm protective height.
Key ratings and what they mean for your safety circuit
Rated for 0.2m to 7.0m operating range, this curtain fits guarding zones from tight machine apertures to wider cell perimeters. The 24VDC supply is standard for safety controllers and PLC-based safety relays. IP65 ingress protection means the emitter and receiver withstand washdown spray and dust ingress — suitable for food processing, packaging lines, and wet machining areas where hose-down cleaning is routine. The -10°C to 55°C operating temperature covers most factory floor conditions without derating.
Blanking and muting for production flow
Built-in blanking and muting functions let the curtain ignore fixed obstructions (like conveyor frames or part fixtures) and temporarily suspend detection during material pass-through. This avoids false trips that stop production while maintaining safety integrity for the rest of the zone. For a line running mixed product sizes, muting eliminates the need for a separate bypass circuit.