SICK WL9G-3P3432 Photoelectric Sensor for Transparent Object Detection
The SICK WL9G-3P3432 photoelectric sensor is a compact retro-reflective solution engineered for dependable detection of transparent and highly reflective objects in industrial automation. Designed around precision PinPoint LED optics, it addresses one of the most common challenges in packaging and material handling: inconsistent sensing of clear films, glass, and plastic containers. With a stable sensing distance of up to 3 meters, automatic signal adaptation, and simple single-button teach-in, this sensor ensures accurate switching performance even when ambient conditions, object surfaces, or backgrounds vary during operation.
The SICK WL9G-3P3432 delivers consistent detection where standard sensors often fail, particularly in applications involving clear or shiny materials. Its focused red light beam improves target discrimination, while polarized optics reduce interference from reflections and background noise. High switching speed supports fast-moving production lines without signal loss, and the rugged, washdown-resistant housing allows use in harsh or hygienic environments. Automatic sensitivity adjustment reduces setup time and maintenance effort, helping operators maintain stable processes, minimize downtime, and achieve higher overall equipment efficiency in real-world factory conditions.
Why SICK WL9G-3P3432?
The SICK WL9G-3P3432 is chosen when reliability matters most in challenging detection tasks involving transparent or reflective materials. Unlike standard photoelectric sensors, it is purpose-built to maintain stable performance even when objects are clear, glossy, or difficult to distinguish from the background. Its compact housing, fast response, and automatic signal optimization make it a strong fit for modern, high-speed automation lines. Engineers value this model for reducing commissioning effort, minimizing false signals, and delivering consistent results without constant recalibration, even as production conditions change.
What problem does it solve?
The SICK WL9G-3P3432 solves the persistent problem of unreliable detection of transparent objects such as glass bottles, plastic containers, or clear films. In many production environments, conventional sensors struggle with reflections, background interference, or weak signal contrast, leading to missed detections or false triggers. This sensor overcomes those issues by using focused optics and intelligent signal adaptation, ensuring accurate object recognition regardless of surface properties. The result is improved process stability, fewer production errors, and reduced downtime in demanding industrial applications.
Key Features & Specifications – SICK WL9G-3P3432 : 1049084
| Feature | Details | Benefit |
|---|---|---|
| Special Capability | Optimized for transparent object detection | Accurate sensing of glass, clear plastic, and films |
| Optical Principle | Coaxial optics with autocollimation | Stable detection even on shiny or reflective surfaces |
| Light Source | Visible red PinPoint LED (650 nm) | Precise light spot improves targeting and setup accuracy |
| Sensing Range | Up to 3 m (max. 5 m with suitable reflector) | Flexible installation across short to medium distances |
| Response Time | < 0.5 ms | Supports high-speed and high-throughput applications |
| Switching Frequency | Up to 1,000 Hz | Reliable performance on fast-moving production lines |
| Output Type | PNP, complementary, light/dark switching | Easy integration with standard PLC inputs |
| Adjustment Method | Single-button teach-in | Fast commissioning with minimal operator training |
| AutoAdapt Function | Automatic signal adjustment | Reduces false triggers and manual recalibration |
| Protection Rating | IP66 / IP67 / IP69K | Suitable for washdown and harsh industrial environments |
| Housing Material | Robust plastic housing | Long service life in demanding conditions |
| Operating Temperature | –40 °C to +60 °C | Reliable operation in cold storage and hot factory areas |
| Power Supply | 10–30 V DC | Compatible with common industrial power systems |
| Mounting | Compact rectangular design with M3 mounting | Easy integration in space-constrained machines |
| Certifications | CE, UL, ECOLAB, RoHS | Compliance with global industrial and hygienic standards |
Download SICK WL9G-3P3432 (1049084) Datasheet
Commercial Information – SICK WL9G-3P3432
| Commercial Data | Details |
|---|---|
| EAN Number | 4047084197406 |
| Weight | 56 g |
| Country of Origin | Germany |
The Applications
1. Precision Detection for Transparent Bottles on Filling Lines
On high-speed beverage and pharmaceutical filling lines, transparent bottles can be difficult to detect because light passes through or reflects unpredictably. The SICK WL9G-3P3432 addresses this challenge by using focused optics and polarized light to clearly distinguish clear containers from the background. Its rapid response ensures accurate detection even at high conveyor speeds, while automatic signal adjustment compensates for variations in bottle thickness, surface moisture, or labeling. This reliable detection helps synchronize filling operations, prevents missed or double fills, and reduces unexpected line stoppages, resulting in smoother operation and improved production consistency.
2. Clear Film Presence Control in Packaging Machinery
Packaging machines that process transparent films require dependable detection to control sealing, cutting, and registration. The WL9G-3P3432 provides stable sensing of clear films that would otherwise be difficult to detect using conventional sensors. Its precisely defined light spot improves contrast against machine components, and the simple teach-in function allows fast setup during format changes. High switching capability supports rapidly moving film without signal loss. By ensuring accurate film positioning, the sensor helps reduce material waste, avoid sealing errors, and maintain consistent packaging quality across different product runs.
3. Transparent Tray and Blister Detection in Pharmaceutical Systems
Pharmaceutical automation often involves clear trays or blister packs moving through inspection and labeling stages. Reliable detection is essential to avoid jams, miscounts, or compliance issues. The WL9G-3P3432 offers dependable performance by minimizing false signals caused by reflections from metal frames or glossy surfaces. Its compact form factor enables installation in confined spaces, while robust construction supports frequent cleaning. Consistent detection of transparent carriers ensures smooth product flow, accurate downstream processing, and stable operation in validated pharmaceutical production environments.
4. Washdown-Safe Detection of Clear Containers in Food Processing
Food processing lines frequently combine transparent containers with intensive cleaning routines. The WL9G-3P3432 is well suited for these conditions, maintaining reliable detection even when surfaces are wet or reflective. Automatic sensitivity adjustment helps the sensor adapt to water droplets and changing ambient light during operation. This allows accurate tracking of clear tubs, covers, or containers throughout production and washdown cycles. The result is improved hygiene compliance, reduced product loss, and uninterrupted operation in demanding food manufacturing environments.
Related Products & Accessories
| Category | Model Name | Part Number | Benefits |
|---|---|---|---|
| Mounting Bracket | BEF-WN-W9-2 | 2022855 | Secure, form-fit mounting designed specifically for W9 series sensors |
| Universal Clamp Plate | BEF-KHS-N08 | 2051607 | Flexible installation on machine frames and profiles |
| Stainless Steel Clamp Plate | BEF-KHS-N11N | 2071081 | Corrosion-resistant mounting for washdown and hygienic environments |
| Fine Triple Reflector | P250F | 5308843 | Improves signal strength and supports longer sensing distances |
| Sensor Cable (PVC) | YF2A14-050VB3XLEAX | 2096235 | Reliable connection for general industrial environments |
| Sensor Cable (PUR) | YF2A14-050UB3XLEAX | 2095608 | Oil-resistant and suitable for drag chain or dynamic applications |
| M12 Connector | STE-1204-G | 6009932 | Simplifies electrical wiring and cabinet-side termination |
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