SICK – VL18‑4N3940 – V18 Series M18 Retro‑Reflective Photoelectric Sensor

The SICK VL18‑4N3940 (part number 6013650) is a cylindrical M18 barrel-style retro-reflective photoelectric sensor from SICK’s V18 family. It features selectable light/dark switching via cable, an NPN output, and a sensing range of 0.05 m to 3 m (extending to 3.7 m with C110A reflector). The 4-pin M12 connector and IP67 enclosure make it ideal for industrial object detection.

Key Features & Specifications:

• Model / MPN: VL18‑4N3940 / 6013650  

• Detection Principle: Retro‑reflective, dual‑lens with polarisation filter  

• Sensing Range: 0.05 m to 3 m typically (max. 3.7 m with C110A reflector)  

• Output Configuration: 4-wire NPN, selectable light/dark switching via cable  

• Connection: 4‑pin male M12 connector  

• Supply Voltage: 10–30 V DC, with ≤30 mA consumption  

• Switching Performance: Response time ≤ 2 ms; switching frequency up to 250 Hz  

• Light Source: Red LED, service life ~100,000 h  

• Housing: M18 × 1 plastic body, 75 mm length; IP67 rating  

• Optical Specs: Focus angle ~2.8°, light spot Ø150 mm at 3 m  

• Protections: Reverse‑polarity, output short‑circuit, overcurrent, and EMI suppression  

• Operating Temp: –25 °C to +70 °C; plastic PBT/PC housing