The Omron E3T-FT13 is a through-beam photoelectric sensor with a 500 mm sensing distance, PNP open-collector output configured Light-ON, and a red LED source at 650 nm. Through-beam gives the most reliable detection across a gap — no false triggers from target color or reflectivity — but requires an emitter and receiver aligned on opposite sides of the path. The 500 mm range suits conveyor belts, part-present checks on packaging lines, and edge detection in assembly fixtures where the gap is under half a meter. IP67 means the housing handles washdown and dust; the cable connection is fixed, no quick-disconnect option.
1 ms response — fast enough for most discrete parts
Response time is 1 ms. That covers typical conveyor speeds for boxes, bottles, and small parts.