The Omron F3SJ-A0305P20 is a Type 4 safety light curtain from the F3SJ-A series, built for guarding access to hazardous machinery. Its 20mm detection capability means it catches fingers reaching into the danger zone — that's finger-protection class per IEC 61496, not just hand or body detection. The 15mm beam pitch and 20 beams give it a 305mm protective height, so it covers a zone roughly the height of a standard machine access panel. The operating range runs from 0.2m out to 9.0m, which covers most reach-in guarding applications on assembly lines, packaging machines, and robotic cells. Power it with 24VDC — standard for safety circuits in industrial control panels. It's rated IP65, meaning the housing is dust-tight and resists water jets from any direction, so it holds up on washdown lines or in dusty environments like woodworking or foundries. It'll run from -10°C to 55°C, which covers most plant-floor conditions short of a freezer or a kiln. Built-in blanking and muting functions let you configure it for applications where fixed objects pass through the field or where you need to temporarily bypass the curtain for a pallet or workpiece. That saves you from buying a separate muting module or controller for basic conveyor or transfer-line guarding.
Omron F3SJ-A0305P20 Light Curtain, 20mm Detection, 305mm Hei
Omron F3SJ-A Series safety light curtain, F3SJ-A0305P20, finger/hand protection, 20mm detection capability, 305mm protective height, 15mm beam pitch, 20 beams, 0.2m to 9.0m range, IP65, 24VDC.
Specifications
| Parameter | Value |
|---|---|
| Series | F3SJ-A |
| Parameter | Value |
|---|---|
| Detection capability (resolution) | 20mm |
| Protection | Finger/Hand |
| Protective height | 305mm |
| Operating range (sensing distance) | 0.2m ~ 9.0m |
| Number of beams | 20 |
| Beam pitch | 15mm |
| Features | Blanking, Muting Function |
| Parameter | Value |
|---|---|
| Supply voltage | 24VDC |
| Parameter | Value |
|---|---|
| Operating temperature | -10°C~55°C |
| Ingress protection (IP) | IP65 - Dust Tight, Water Resistant |
Product details
Frequently asked questions
What does the 20mm detection capability mean in practice?
A 20mm detection capability means the light curtain reliably detects a finger-sized object (20mm diameter) entering the field. That qualifies as finger protection per IEC 61496-1, so it's suitable for guarding access points where a hand or finger could reach into a hazard zone.
What is the protective height and how do I size it for my machine?
The protective height is 305mm, which is the vertical zone the 20 beams cover. You need to position the curtain so that height covers the entire reach-in opening. For taller openings, you stack multiple units or look at the F3SJ-A series with higher beam counts.
Can this light curtain handle washdown environments?
Yes, it's rated IP65 — dust-tight and protected against water jets from any direction. That's fine for most washdown lines in food processing or general industrial cleaning, but it's not rated for submersion (IP67) or high-pressure steam cleaning (IP69K).
What are the blanking and muting features for?
Blanking lets you mask specific beams so fixed objects (like a machine frame or conveyor rail) can pass through the field without tripping the safety output. Muting temporarily bypasses the curtain when a workpiece or pallet needs to pass through during normal operation, like on a transfer line. Both are built into this model without needing extra modules.