VL18-4P3940 Cylindrical Retro-reflective Sensor 3.7m PNP IP67 | SICK

The Original New SICK VL18-4P3940 (6013659) is a cylindrical photoelectric retro-reflective sensor from the V18 series, designed for reliable object detection in industrial automation. Its M18 threaded plastic housing (PBT/PC) with radial optical axis and visible red LED light source enables straightforward installation in standard mounting holes. The sensor provides a PNP output with light/dark switching selectable via control wire, and sensitivity is adjustable through a 270° potentiometer. Rated IP67, it is suitable for washdown and dust-prone environments. The VL18-4P3940 is a versatile solution for conveyor, packaging, and general discrete automation applications.

Core Engineering Highlights:
Photoelectric retro-reflective sensor | 0.05 m … 3.7 m maximum sensing range (with C110A reflector) | Visible red LED, 650 nm | PNP output, light/dark switching selectable | ≤ 2 ms response time / 250 Hz switching frequency | 10–30 V DC supply voltage | IP67 enclosure rating | M12 4-pin connector | 18 × 18 × 75 mm cylindrical housing | –25°C to +70°C operating temperature

Key Features:

• Original New SICK VL18-4P3940 sensor (part no. 6013659)

• Cylindrical M18 × 1 threaded plastic housing (PBT/PC) with radial optical axis

• Visible red LED light source with Ø 150 mm light spot at 3 m

• PNP output with light/dark switching selectable via control wire

• 270° potentiometer for sensitivity adjustment

• Polarising filter for reliable detection of reflective targets

• IP67 protection rating for washdown and dusty environments

• M12 4-pin connector for quick electrical connection

• Circuit protection: reverse polarity (A, B), interference suppression (C), output overcurrent and short-circuit (D)

Applications:

• Conveyor part presence detection in assembly lines

• Object counting in packaging and labelling systems

• End-of-travel sensing on pneumatic actuators

• Small-part detection in pick-and-place machines

• General discrete automation cells requiring retro-reflective sensing

Technical Specifications:

Footnotes:
¹ Reflector C110A.
² Average service life: 100,000 h at TU = +25°C.
³ Limit values.
⁴ May not exceed or fall below UV tolerances.
⁵ Without load.
⁶ Control wire open: dark switching D.ON.
⁷ Signal transit time with resistive load.
⁸ With light/dark ratio 1:1.
⁹ A = UV connections reverse-polarity protected; B = inputs and output reverse-polarity protected; C = interference pulse suppression; D = outputs overcurrent and short-circuit protected.

System Compatibility:

• Compatible with standard industrial controllers accepting PNP discrete inputs.

• M12 4-pin connector mates with standard M12 female cordsets.

• Requires a suitable reflector for operation (e.g., C110A for maximum 3.7 m range).

• Mounts via M18 × 1 threaded body using supplied nuts.

Related Products:

• C110A – Standard reflector for 3.7 m sensing range

• P250 – 47 × 47 mm rectangular reflector for alternative mounting

• VL18-4P3940S – Variant with different connection or feature set (verify)

• VL18-4N3940 – NPN output version of the same sensor family

• YF2A14-xxxVB3XLEAX – M12 straight female cordset, 4-pin, various lengths

• BEF-W18 – Mounting bracket for V18 series sensors (if required)

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. SICK and V18 are trademarks of SICK AG.