SICK VL18-4N3440 Retro-Reflective Photoelectric Sensor – Reliable Detection in Compact M18 Design
SICK VL18-4N3440 retro-reflective photoelectric sensor is an industrial-grade M18 sensor developed for dependable object detection in automated systems. It addresses common detection issues such as unstable signals, reflective backgrounds, and harsh operating conditions. Using visible red LED technology combined with optical polarization, the sensor maintains consistent switching over distances up to 3 m when paired with a suitable reflector. Its compact cylindrical body, IP67 protection, and metal housing make it well suited for confined installations in production lines, conveying systems, and packaging machinery where accuracy and durability are essential.
In real applications, the VL18-4N3440 helps reduce false detections and unplanned downtime. The built-in polarizing optics minimize interference from shiny or reflective objects, while the adjustable sensitivity allows technicians to fine-tune performance directly on site. A fast response time supports high-speed processes, and the rugged nickel-plated brass housing withstands vibration, dust, and temperature variation. Standard M12 connectivity and selectable light or dark switching simplify electrical integration, enabling stable, repeatable detection and lower maintenance effort across long-term industrial operation.
Why SICK VL18-4N3440?
The SICK VL18-4N3440 stands out for its ability to deliver consistent sensing in environments where space is limited and conditions are unpredictable. Its compact M18 metal housing, fast response time, and stable retro-reflective optics make it a dependable choice for engineers who value long service life, simple setup, and repeatable performance. It is designed to work reliably day after day, even in dusty, vibrating, or high-throughput industrial applications.
What problem does it solve?
The SICK VL18-4N3440 solves the challenge of unreliable object detection caused by reflective surfaces, inconsistent targets, and harsh factory conditions. By suppressing false signals and maintaining stable switching over longer distances, it prevents missed detections and false triggers. This directly reduces production errors, machine stoppages, and manual readjustment, helping automation systems run smoothly with higher efficiency and lower maintenance demand.
Key Features & Specifications – SICK VL18-4N3440: Part Number 6013578
| Feature |
Details |
Benefit |
| Sensing Principle |
Retro-reflective photoelectric sensor with polarizing filter |
Reliable detection with reduced false triggering from shiny or reflective objects |
| Sensing Range |
0.05 m to 3 m (up to 3.7 m with suitable reflector) |
Covers short to medium distances, ideal for conveyors and automated lines |
| Light Source |
Visible red LED |
Easy alignment during installation and commissioning |
| Response Time |
≤ 2 ms |
Supports fast-moving objects and high-speed processes |
| Switching Output |
NPN transistor output |
Compatible with common PLC and control systems |
| Switching Mode |
Light / Dark switching, selectable |
Flexible logic configuration for different automation needs |
| Sensitivity Adjustment |
Potentiometer, 270° rotation |
Fine tuning for stable performance in real-world conditions |
| Housing Size |
M18 cylindrical, 18 × 18 × 75 mm |
Compact design for installations with limited space |
| Housing Material |
Nickel-plated brass |
High mechanical strength and resistance to industrial wear |
| Optical Material |
PMMA plastic optics |
Stable optical performance with long service life |
| Supply Voltage |
10 V DC to 30 V DC |
Wide voltage range for flexible system integration |
| Current Consumption |
Approx. 30 mA (no load) |
Energy-efficient operation |
| Output Current |
≤ 100 mA |
Suitable for standard industrial loads |
| Switching Frequency |
Up to 250 Hz |
Reliable detection in dynamic applications |
| Connection Type |
M12, 4-pin male connector |
Fast installation and secure electrical connection |
| Protection Rating |
IP67 |
Resistant to dust, moisture, and washdown environments |
| Operating Temperature |
–25 °C to +70 °C |
Stable operation in cold and hot industrial conditions |
| Protection Functions |
Reverse polarity, short-circuit, overcurrent protection |
Enhanced safety and reduced risk of sensor damage |
Download SICK VL18-4N3440 (6013578) Datasheet
Commercial Information – SICK VL18-4N3440: Part Number 6013578
| Commercial Data |
Details |
| EAN Number |
4047084156816 |
| Weight |
61 g |
| Country of Origin |
Italy |
The Applications
1. Stable Pallet Detection on Conveyor Transfer Lines
In automated conveyor systems, pallets come in many surface finishes, including bare wood, painted boards, and stretch-wrapped loads. These variations often cause unstable signals with basic photoelectric sensors. The VL18-4N3440 uses a retro-reflective principle with optical polarization to maintain consistent detection while suppressing unwanted reflections. Its long sensing distance allows the sensor to be mounted safely away from moving loads, and the fast response time supports high conveyor speeds. The compact M18 metal body fits into narrow conveyor frames, while the IP67-rated housing ensures reliable operation in dusty, vibrating material-handling environments.
2. Carton Presence Monitoring in Packaging Machines
Packaging machines depend on precise carton detection to avoid jams, sealing errors, or wasted materials. The VL18-4N3440 delivers stable performance even when carton color, print density, or surface coating changes. Visible red light makes alignment straightforward during setup and maintenance, reducing commissioning time. Sensitivity adjustment allows operators to fine-tune the sensor when switching between different packaging formats. With a rapid switching response and robust metal housing, the sensor supports continuous high-speed operation and withstands washdown, vibration, and mechanical stress common in packaging lines.
3. Reliable Object Detection in Automated Storage Systems
Automated storage and retrieval systems require dependable sensing at transfer points where bins or carriers must be accurately positioned. The VL18-4N3440 provides consistent detection over extended distances, ensuring reliable confirmation of tray or container presence. Polarized optics help prevent false triggering caused by reflective labels or plastic surfaces. Its wide operating temperature range supports use in standard warehouses as well as temperature-controlled storage areas. Standardized electrical connection simplifies replacement and maintenance, helping minimize system downtime during long-term operation.
4. Part Presence Verification in Assembly and Inspection Stations
In assembly and inspection stations, confirming that a component is present before the next process step is critical for quality control. The VL18-4N3440 enables reliable verification even when parts have uneven shapes or reflective finishes. Selectable light or dark switching allows flexible logic configuration without modifying wiring. The fast response time supports short cycle times, while the slim cylindrical design allows installation close to fixtures and tooling. This improves detection reliability, reduces scrap, and helps maintain consistent production quality across shifts.
Related Products & Accessories
| Category |
Model Name |
Part Number |
Benefits |
| Mounting Bracket (M18 Sensors) |
BEF-WN-M18 |
5308446 |
Provides secure and stable mounting for M18 sensors in conveyor frames, machines, and brackets |
| Reflector Mounting Bracket |
BEF-WN-REFX |
2064574 |
Enables precise and rigid installation of reflectors, ensuring reliable retro-reflective sensing |
| Universal Clamp Plate |
BEF-KHS-N11N |
2071081 |
Allows flexible mounting on machine frames, profiles, or round structures |
| Sensor Cable (PVC, 5 m) |
YF2A14-050VB3XLEAX |
2096235 |
Standard M12 sensor cable suitable for general industrial environments |
| Sensor Cable (PUR, 5 m, Drag Chain) |
YF2A14-050UB3XLEAX |
2095608 |
Designed for dynamic applications such as robotics and drag-chain movement |
| M12 Connector Adapter |
STE-1204-G |
6009932 |
Simplifies wiring and termination in control cabinets or junction boxes |
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