Sick
Sick VL18-4P3940 Photoelectric retro-reflective sensor PNP
A cylindrical photoelectric retro-reflective sensor with a 5 cm to 3.7 m range, visible red LED, PNP output and an M12 connector, rated IP67 for –25 °C to +70 °C operation
- Retro-reflective detection up to 3.7 m range
- Visible red LED with 2.8° dispersion angle
- PNP output selectable light or dark switching
- M12 4-pin connector for quick installation
- IP67 rated housing operates –25 °C to +70 °C
Industrial detection sensor
The Sick VL18-4P3940 is a cylindrical photoelectric retro-reflective sensor built for industrial automation. Its M18 x 1 threaded housing measures 75 mm in length and carries a radial optical axis. The unit operates on 10 V DC to 30 V DC supply voltage and connects via a male M12, 4-pin connector. A visible red LED emits a 2.8° dispersion angle, producing a 150 mm light spot at 3 m distance.
Automation engineers and machine builders
This sensor suits engineers who need a PNP switching output with selectable light or dark switching via an L/D control cable. The potentiometer allows 270° sensitivity adjustment for precise setup. It is not for applications requiring an NPN output type or a different connector format. Buyers who need a through-beam or diffuse detection principle should look at other models. The IP67 enclosure rating supports harsh environments.
Stable operation under continuous cycling
The sensor delivers a 2 ms response time and a 250 Hz switching frequency for reliable detection on fast production lines. Output current is limited to 100 mA with built-in circuit protection A, B, C and D. Protection class III and an operating range of –25 °C to +70 °C ensure consistent behaviour during extended shifts. The plastic PBT/PC housing and PMMA optics resist industrial wear while maintaining optical clarity.
Highlights
- Retro-reflective detection up to 3.7 m range
- Visible red LED with 2.8° dispersion angle
- PNP output selectable light or dark switching
- M12 4-pin connector for quick installation
- IP67 rated housing operates –25 °C to +70 °C
Specifications
| Brand | Sick |
|---|---|
| Model | SICK VL18-4P3940 |
Questions about this item
What supply voltage must my system provide for the VL18-4P3940 to operate?
The sensor requires 10 V DC to 30 V DC with ripple no greater than 10 %.
Can I connect the M12 connector to an existing NPN input module?
No, the switching output is PNP only and cannot drive an NPN input directly.
How do I confirm the sensor is detecting the reflector at the 3 m sensing range?
The output toggles at up to 250 Hz; watch the load change state each time the beam is interrupted.
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