Sick VL18-3F3140 photoelectric retro-reflective sensor PNP

Industrial sensing component

The Sick VL18-3F3140 is a cylindrical photoelectric retro-reflective sensor with an M18 x 1 thread and 78 mm housing length. It operates on 10 V DC to 30 V DC supply voltage and provides a PNP light-switching output rated at 100 mA maximum current. The sensor uses visible red LED light with a 2.8° dispersion angle, creating a 150 mm spot at 3 m distance. Its IP67 enclosure rating and nickel-plated brass housing suit harsh industrial environments.

Integration requirements

The sensor mounts via its M18 thread and connects through a male M12 4-pin connector, requiring a compatible cable or distribution box. It needs a stable DC supply within the 10 V to 30 V range with ripple below 10 % and draws 30 mA during operation. The 2 ms response time and 250 Hz switching frequency suit fast automation cycles. Polarisation filtering helps reject reflections from shiny targets, while the axial optical axis simplifies alignment in tight machine frames.

Thermal and power profile

With a low 30 mA power consumption, the unit generates minimal heat inside a protected IP67 housing rated for -25 °C to +70 °C ambient temperatures. The metal body acts as a passive heat sink, and the sensor has no moving parts or fan, ensuring silent operation. Circuit protection covers reverse polarity, short-circuit, overload and voltage transients, maintaining reliability across the full operating range without active cooling.