Sick VL18-3N3912 Photoelectric retro-reflective sensor NPN electrician tool

Sick VL18-3N3912 retro-reflective sensor

The Sick VL18-3N3912 is a photoelectric retro-reflective sensor with NPN dark-switching output. It suits automation engineers and electricians who need reliable object detection on conveyors or packaging lines. The cylindrical angled housing measures 60.6 mm and uses visible red LED light with a 2.8° dispersion angle. Sensitivity is set via an onboard potentiometer.

Check supply voltage and wiring before ordering

Verify that your control system provides 10 V DC to 30 V DC with ripple below 10 %. The sensor draws a maximum of 30 mA and requires an NPN-compatible input. A 2 m PVC cable with 0.14 mm² conductors and 3.1 mm outer diameter is fitted, so confirm cable routing and connector compatibility in your panel. The IP67 enclosure rating protects against dust and temporary immersion.

Thermals noise and power in normal use

Operating temperature spans –25 °C to +70 °C, matching the storage range, so the unit tolerates cold starts and warm machine environments without derating. Power consumption stays at or below 30 mA, generating negligible heat inside the plastic housing. No moving parts or fan are present, so acoustic noise is effectively zero during the 2 ms response cycles.