$ 204.75
SICK WL12-3P1731 photoelectric sensor with polarised retro-reflective optics for reliable object detection in harsh industrial automation environments.
The SICK WL12-3P1731 photoelectric retro-reflective sensor is a compact and robust solution designed for dependable object detection in industrial automation systems. It uses visible red LED technology combined with a polarisation filter to accurately detect objects while avoiding interference from reflective backgrounds. With a stable sensing distance suitable for medium-range applications and a fast switching response, this sensor addresses common detection challenges on conveyors, packaging lines, and automated handling equipment. Its durable metal housing and high ingress protection ratings make it suitable for environments exposed to dust, moisture, vibration, and frequent cleaning.
In practical applications, the SICK WL12-3P1731 improves detection reliability where shiny surfaces, varying materials, or unstable lighting conditions often cause false signals. The coaxial optical design ensures consistent alignment and dependable signal return, while adjustable sensitivity allows fine tuning during installation. Its PNP output integrates easily with standard control systems, supporting both light and dark switching logic. Designed for continuous operation over a wide temperature range, the sensor helps reduce unplanned downtime, increases process stability, and delivers long-term performance in demanding industrial production environments.
The SICK WL12-3P1731 is chosen when reliability, durability, and signal stability are non-negotiable. It combines polarised retro-reflective sensing with coaxial optics to deliver consistent detection even in visually challenging environments. Its rugged metal housing, wide temperature tolerance, and fast response time make it well suited for continuous industrial operation. For engineers and system integrators, this model offers predictable performance, easy adjustment during commissioning, and long service life, reducing maintenance effort while maintaining high process confidence.
The SICK WL12-3P1731 addresses one of the most common automation challenges: unreliable object detection caused by reflective surfaces, ambient light interference, or harsh environmental conditions. In production lines where false triggers or missed detections can disrupt throughput, this sensor ensures stable switching by filtering unwanted reflections and maintaining precise alignment. It helps prevent process interruptions, product miscounts, and control errors, enabling smoother material flow, higher machine uptime, and more consistent quality in automated manufacturing and logistics systems.
| Feature | Details | Benefit |
|---|---|---|
| Sensor Type | Photoelectric retro-reflective sensor with polarisation filter | Prevents false detection from glossy or reflective surfaces |
| Optical Principle | Coaxial optics (autocollimation) | Ensures stable sensing even with minor misalignment |
| Light Source | Visible red LED, approx. 640 nm | Simplifies installation and visual alignment |
| Sensing Distance | Up to 5 m typical, 7 m maximum with reflector | Suitable for medium-range conveyor and automation tasks |
| Response Time | ≤ 330 µs | Reliable detection of fast-moving objects |
| Switching Frequency | Up to 1,500 Hz | Supports high-speed production lines |
| Output Type | PNP, complementary output | Easy integration with PLC and industrial controllers |
| Switching Logic | Selectable light-on / dark-on | Flexible control logic for various applications |
| Sensitivity Adjustment | 5-turn potentiometer | Precise tuning for challenging detection conditions |
| Housing Design | Compact rectangular metal housing | High durability in industrial environments |
| Environmental Rating | IP66, IP67, IP69K | Withstands dust, moisture, and wash-down cleaning |
| Operating Temperature | –40 °C to +60 °C | Stable operation in cold, hot, or outdoor locations |
| Electrical Protection | Reverse polarity, short-circuit, overcurrent protection | Protects sensor and control system from electrical faults |
| Mounting Interface | Standard mounting holes and brackets | Fast installation and retrofit compatibility |
| Service Life | Long LED lifetime | Reduced maintenance and total cost of ownership |
Download SICK WL12-3P1731 (1041438) Datasheet
| Commercial Data | Details |
|---|---|
| EAN Number | 4047084141065 |
| Net Weight | 230 g |
| Country of Origin | Hungary |
1. Conveyor Object Presence Verification
In high-speed conveyor systems, consistent object detection is essential to maintain throughput and prevent mechanical faults. The WL12-3P1731 is commonly installed across conveyor lanes to verify the presence of boxes, totes, or workpieces before sorting or transfer. Its fast response time allows accurate detection even when items move rapidly and with minimal spacing. The polarisation filter helps suppress unwanted reflections from glossy packaging or printed surfaces. Adjustable sensitivity enables adaptation to different object sizes and materials, ensuring stable switching signals that improve process reliability and reduce unplanned downtime in automated material handling lines.
2. Bottle Detection in Filling and Capping Lines
Production lines handling transparent or reflective containers often face challenges with unreliable sensing. The WL12-3P1731 addresses this by using polarised retro-reflective optics that maintain stable detection regardless of surface finish. Positioned before filling or capping stations, the sensor confirms container presence to prevent empty fills or spillage. Its compact design fits easily into dense machine layouts, while the robust housing tolerates frequent wash-down procedures. By ensuring accurate detection of clear bottles and jars, the sensor supports consistent product quality and reduces waste in beverage and liquid packaging operations.
3. Tray and Film Position Control
Packaging machines require precise position feedback to ensure correct sealing, cutting, or labeling. The WL12-3P1731 is often used to monitor tray or film position before critical machine actions occur. Its rapid switching capability supports short cycle times, while selectable light or dark switching simplifies integration with different control logic. The visible light beam assists technicians during setup and maintenance. Reliable operation in dusty or vibrating environments helps maintain consistent package quality, minimize rejects, and improve overall equipment efficiency on high-output packaging lines.
4. Pallet and Carrier Detection in Material Handling
In logistics and warehouse automation, sensors are exposed to dust, moisture, and mechanical stress. The WL12-3P1731 is well suited for detecting pallets or carriers at transfer stations, lifts, or accumulation zones. Its robust enclosure and high ingress protection ratings allow continuous operation in challenging conditions. The extended sensing distance provides flexibility in mounting, even where space constraints exist. Built-in electrical protections reduce the risk of damage during maintenance or wiring changes, contributing to stable system operation and dependable material flow in automated logistics systems.
| Category | Model Name | Part Number | Benefits |
|---|---|---|---|
| Mounting Bracket | BEF-WG-W12 | 2013942 | Large, robust mounting bracket enabling stable sensor installation in industrial machinery |
| Reflector Mounting Bracket | BEF-WN-REFX | 2064574 | Flexible universal bracket for precise reflector alignment in retro-reflective setups |
| Clamp Plate Assembly | BEF-KHS-N11N | 2071081 | Stainless-steel clamp solution for secure mounting in demanding environments |
| Reflector | PL20A | 1012719 | Compact reflector suitable for short to medium sensing distances |
| Electrical Connector / Cable | STE-1204-G | 6009932 | M12, 4-pin connector ensuring reliable signal transmission to control systems |
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