Sick WL12G-3B2531 Photoelectric Sensor
Sick WL12G-3B2531 is a retro-reflective photoelectric sensor with 4 m sensing range and 25 mm light spot support operation. This Sick photoelectric sensor from the W12 series uses autocollimation optics, polarisation filters, visible red LED at 640 nm, supports PNP and NPN outputs, operates on 10–30 V DC, delivers ≤330 µs response time at 1,500 Hz, and features IP66/IP67/IP69K protection with an M12 5-pin metal housing.
| Brand | Sick |
| Product Type | Photolectric Sensor |
| Model Number | WL12G-3B2531 |
Sick WL12G-3B2531 Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Functional principle | Photoelectric retro-reflective sensor |
| Functional principle detail | Autocollimation |
| Sensing range max. | 0 m ... 4 m |
| Sensing range | - |
| Polarisation filters | Yes |
| Light source | LED |
| Type of light | Visible red light |
| Light spot size (distance) | Ø 25 mm (1.5 m) |
| Wave length | 640 nm |
| Adjustment | Potentiometer, 11 turns |
| Angle of dispersion | Approx. 1.5° |
| Special applications | Detecting transparent objects |
| Items supplied | 2 x clamps BEF-KH-W12, incl. screws |
| Supply voltage UB | 10 V DC ... 30 V DC |
| Ripple | < 5 Vpp |
| Current consumption | 30 mA |
| Protection class | III |
| Digital Output type | PNP, NPN |
| Switching mode | Light switching, Dark switching |
| Signal voltage PNP HIGH/LOW | > Uv - 3 V / ca. 0 V |
| Output current Imax. | ≤ 100 mA |
| Response time | ≤ 330 µs 4) |
| Switching frequency | 1,500 Hz 5) |
| Output function | - |
| Special feature | Detecting transparent objects |
| Housing | Rectangular |
| Dimensions (W x H x D) | 15.6 mm x 48.5 mm x 42 mm |
| Connection | Male connector M12, 5-pin |
| Housing material | Metal, zinc diecast |
| Front screen material | Plastic, PMMA |
| Enclosure rating | IP66, IP67, IP69K |
| Ambient operating temperature | –40 °C ... +60 °C |
| Ambient temperature, storage | –40 °C ... +75 °C |
| Weight | 120 g |
The WL12G-3B2531 Sick 25mm Light Spot Photo Sensor is a retro-reflective photoelectric sensor designed for precise detection tasks in industrial automation. It provides a maximum sensing range of 4 m, a 25 mm focused light spot, and supports PNP/NPN output operation using a visible red LED. The sensor belongs to the Sick W12 series and is commonly integrated into automated production and monitoring systems.
In industrial applications, the WL12G-3B2531 Sick 25mm Light Spot Photo Sensor is used in packaging lines, conveyors, automated assembly stations, and material handling systems. The focused light spot and retro-reflective operating principle enable reliable detection of transparent or difficult-to-detect objects. Stable switching behavior and defined response time support consistent performance in continuous automation processes, while the compact rectangular housing allows flexible mounting.
The WL12G-3B2531 from Sick combines defined optical behavior, electrical stability, and mechanical protection for dependable industrial use. With wide operating voltage, dual output compatibility, and high enclosure ratings, it integrates smoothly into standard control panels. As part of the W12 series, this Sick photoelectric sensor meets established industrial automation requirements where reliable object detection and long-term operational stability are essential.
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