Sick VL18-4N3712 photoelectric retro-reflective sensor NPN

Sick VL18-4N3712 retro-reflective sensor

The Sick VL18-4N3712 is a cylindrical photoelectric retro-reflective sensor designed for industrial detection tasks. It operates on a 10 V DC to 30 V DC supply and provides an NPN switching output with selectable light or dark switching via an L/D control cable. The sensor suits automation engineers and electricians needing reliable object detection within a 3.7 m maximum range.

Check supply voltage and wiring before ordering

Verify that your control system provides a 10 V DC to 30 V DC source with ripple below 10 % and can accept an NPN output rated at 100 mA. Ensure the 4-wire PVC cable with 0.14 mm² conductors and 5 mm diameter matches your terminal or connector requirements. Confirm the M18 x 1 thread and 63.6 mm housing length fit the available mounting space and that the IP67 rating meets the environmental conditions.

Potentiometer and polarisation filter aid setup

A 270° sensitivity potentiometer allows precise adjustment of the switching threshold for the visible red LED beam. The integrated polarisation filter improves detection reliability on reflective targets by suppressing unwanted reflections. The 2 m pre-wired cable eliminates the need for separate connector assemblies, reducing installation time and potential failure points.