Through-beam at 500 mm — what it means on the line
The Omron E3T-FT11 is a through-beam photoelectric sensor that breaks a red 650 nm beam across a 500 mm gap. When an object interrupts the beam, the NPN open-collector output switches Light-ON — meaning the output is on when the beam is uninterrupted, off when blocked. That 1 ms response time keeps up with fast-moving parts on a packaging or conveyor line, and the IP67 rating means it handles washdown without a second enclosure.
Mounting and wiring — what to expect
Cable connection, no connector — plan for a gland or strain relief at the panel entry. The -25°C to 55°C operating range covers most indoor factory floors but not freezer or outdoor summer extremes. Supply it with 12 VDC; the NPN output sinks to ground, so verify your load is between the output and the positive rail.