- AC Drives
- Industrial Communications
- PLC & I/O Cards
- Vibration Monitoring
- Automation Accessories
- Controllers & Data Acquisition
- CCTV & Security
- Safety Switches & Guard Locking
- Encoders
- Industrial Computers
- Servo Drives
- Motor Soft Starters
- HMI Displays
- Pneumatic Cylinders
- Isolator & Barrier
- Automation Software
- Machine Vision
- Robotics
Brand: SICK
SICK WL4SLG-3P5254H W4 Retro-Reflective Sensor
Description
WL4SLG-3P5254H is a SICK W4 retro-reflective photoelectric sensor (part no. 1109333) that sends a light beam to a reflector and switches when an object interrupts it. The catalogue summary lists: sensing range max.: 0 m … 3.5 m; functional principle: Photoelectric retro-reflective sensor; switching output: PNP; switching mode: Light switching; connection type: Male connector M8, 4-pin.
How the WL4SLG-3P5254H works and where it fits
Only one electrical connection is needed, which saves cabling compared with a through-beam pair. Polarisation filters in the sensor allow shiny objects to be detected: a mirror-like surface reflects light without rotating its polarisation, so it is not mistaken for the reflector.
Alignment is straightforward: the visible spot should hit the reflector in its centre, and the signal indicator LED shows whether enough light returns. A good margin means the sensor will keep working when dust builds up.
Technical specifications
| Parameter | Specification |
|---|---|
| Type code | WL4SLG-3P5254H |
| Part number | 1109333 |
| Product family | W4 |
| Functional principle | Photoelectric retro-reflective sensor |
| Functional principle detail | Without reflector minimum distance (autocollimation/coaxial optics) |
| Sensing range max. | 0 m … 3.5 m |
| Sensing range | 0 m … 2.2 m |
| Polarisation filter | Yes |
| Emitted beam: Light source | Laser |
| Emitted beam: Type of light | Visible red light |
| Emitted beam: Light spot size (distance) | Ø 1 mm (500 mm) |
| Key laser figures: Normative reference | EN 60825-1:2014, IEC 60825-1:2014 / CDRH 21 CFR 1040.10 & 1040.11 |
| Key laser figures: Laser class | 1 |
| Key laser figures: Wave length | 650 nm |
| Adjustment | Teach-in by wire |
| Special applications | Hygienic and washdown zones, Detecting transparent objects, Detecting small objects |
| Housing design | Hygiene |
| MTTFD | 589 years (EN ISO 13849-1) |
| DCavg | 0 % |
| Supply voltage UB | 10 V DC … 30 V DC |
| Current consumption | 30 mA |
| Digital output: Type | PNP |
| Digital output: Switching mode | Light switching |
| Digital output: Output current Imax. | ≤ 100 mA |
| Digital output: Response time | ≤ 0.5 ms |
| Digital output: Switching frequency | 1,000 Hz |
| Circuit protection | A; B; C |
| Special feature | D12 adapter shaft |
| Housing | Rectangular |
| Design detail | Slim |
| Declarations and certificates in the data sheet | EU declaration of conformity; UK declaration of conformity; ACMA declaration of conformity; Moroccan declaration of conformity; China RoHS; China Compulsory Product Certification (CCC) exempt; ECOLAB certificate; Laser safety (IEC 60825-1) certificate |
Ordering WL4SLG-3P5254H: type code, part number and fit
Electrically and for the interface, the listed values are supply is 10 V DC … 30 V DC; current is 30 mA; frequency is 1,000 Hz; range is 0 m … 3.5 m; response time is ≤ 0.5 ms.
Mechanical and environmental data for this type: wavelength of 650 nm; operating temperature of –10 °C … +50 °C; weight of 140 g; enclosure rating of IP66; IP67; IP68; IP69K; light source of Laser; dimensions of 15.3 mm x 63.2 mm x 22.2 mm.
Compare the complete type code with the unit being replaced.
Check the enclosure rating, the housing material and the operating temperature range in the table against the environment; reflectors and sensors for washdown or outdoor use are different items.
Documents and quotation
Attached to this page: the SICK data sheet for WL4SLG-3P5254H, part no. 1109333, as published by SICK. To request a quotation, submit the part number with quantity and destination in the RFQ form; Seven Star LLC is an independent supplier based in Muscat. Related SICK items are listed under Sensors & Transmitters. Check wiring, mounting and approvals against the data sheet before you order, since the data sheet is the governing document.
Datasheets & Documents
- Datasheet SICK WL4SLG-3P5254H official data sheet (part no. 1109333) Download
Reviews (0)
About brand
SICK is the German maker of industrial sensors: photoelectric and proximity sensors, safety laser scanners and light curtains, encoders, distance sensors, code readers and gas analysers. Erwin Sick, an optics engineer, founded it in Munich in 1946, and in 1952 it introduced its first marketable accident-prevention light curtain, which protected press operators by stopping the machine when a hand broke the light beam. The company moved to Waldkirch in the Black Forest in 1956 and is still headquartered there. It is a privately held company, and has been an Aktiengesellschaft (AG) since 1996.
SICK company profile
| Founded | 1946, Munich, Germany, by Erwin Sick (1909–1988) |
|---|---|
| Headquarters | Waldkirch, Baden-Württemberg, Germany (since 1956) |
| Ownership | Privately held; after the founder's death in 1988 his widow Gisela Sick became the main shareholder. Legal form SICK AG since 1996 |
| Size | More than 12,000 employees and group revenue of about EUR 2.3 billion (company figures for 2023) |
| First breakthrough | Accident-prevention light curtain for presses, shown in Hanover in 1952 |
| International growth | First foreign subsidiary in France in 1972, United States in 1976; today sales and service companies worldwide |
| Product families | Photoelectric, inductive, capacitive, magnetic and ultrasonic sensors; safety laser scanners, light curtains, safety controllers and relays; encoders and motor feedback systems; distance sensors and LiDAR; barcode and 2D code readers and machine vision; gas analysers, dust and flow measurement for process and emissions monitoring |
Milestones
- 1946: Erwin Sick receives a licence to run his engineering firm in Munich.
- 1952: The first marketable accident-prevention light curtain is presented in Hanover and goes into series production.
- 1956: The company moves to Waldkirch with 25 employees.
- 1972 and 1976: Subsidiaries are founded in France and the United States.
- 1996: SICK becomes an Aktiengesellschaft.
- Today: Sensors for factory and logistics automation, machine safety and process analysis, with a large share of revenue outside Germany.
Choosing a SICK sensor
For object detection, the sensing principle comes first. A retro-reflective sensor (WL series) sends light to a reflector and switches when an object breaks the beam; it is reliable over long distances and easy to align. A sensor with background suppression (WTB series) detects an object at a set distance and ignores what is behind it, which suits conveyors with shiny or dark backgrounds. A through-beam pair (WS/WE) gives the longest range and the highest reliability in dust. For transparent bottles and film, use a model built for transparent objects (for example WL12G-3B or WL150-P420). The digits in the code also matter: "P" usually means a PNP output and "N" NPN, and the last digits set the connector or cable. For machine guarding, a safety laser scanner such as nanoScan3 or microScan3 protects an area, while a safety controller such as Flexi Soft combines several safety devices.
Where SICK products are used
In Oman and the GCC, SICK sensors are used in packaging and bottling lines, food and beverage plants, logistics and airport baggage handling, cement and steel plants, ports and cranes, automated warehouses, and on machines built by European OEMs. SICK safety scanners guard robots and automated guided vehicles, and its encoders give position feedback on motors, hoists and conveyors.
SICK products we list
| Family | Examples |
|---|---|
| Photoelectric sensors | WL12-3P2431, WTB12-3P2431, GTB6-P4211, VL18-4P3240, WL12G-3B2531, WS/WE100, KT5W contrast, W26 IO-Link |
| Proximity, cylinder and ultrasonic sensors | IME12-08NPSZC0S, IME18-05BPSZC0S, MZT8, UM18 4-20 mA, UM30, UFN3 fork |
| Machine safety | nanoScan3, microScan3, S300 Professional, Flexi Soft FX3-CPU1, FX3-XTIO, ReLy OSSD |
| Encoders and motor feedback | DFS60B, AFM60 PROFINET, AFS60 SSI, ATM60 PROFIBUS, SRS50, EFS50 |
| Distance sensors and code readers | DT50, DL50, DT35, Lector632 |
Ordering SICK products: what we need
Send the type code and the 7-digit SICK part number from the label (for example WTB12-3P2431 together with its part number). For a replacement sensor, add the output (PNP or NPN), connection (M8, M12 or cable) and sensing distance. For encoders, add the interface (incremental, SSI, PROFIBUS, PROFINET), resolution and shaft type. For safety scanners, tell us the model and whether the existing configuration needs to be kept.
Facts checked against SICK's published company history and annual figures, October 2026.
Browse SICK products by category: Sensors & Transmitters.
Related products
Frequently Asked Questions
What is the SICK WL4SLG-3P5254H?
It is a SICK retro-reflective sensor (W4), part no. 1109333. The catalogue summary reads: Sensing range max.: 0 m ... 3.5 m; Functional principle: Photoelectric retro-reflective sensor; Switching output: PNP; Switching mode: Light switching.
What supply does the WL4SLG-3P5254H need?
Supply voltage is 10 V DC ... 30 V DC. Check the output and interface rows in the table for the signal levels.
What protection rating and temperature range are given?
Enclosure rating: IP66; IP67; IP68; IP69K. Ambient operating temperature: –10 °C ... +50 °C. Confirm both against the site before ordering.
Does the page include the data sheet?
Yes. The official SICK data sheet for part no. 1109333 is attached as a PDF and linked on this page; where it differs from the page text, the data sheet applies.
What should be confirmed before ordering the WL4SLG-3P5254H?
Compare the full type code and part number 1109333 with the device being replaced, check supply, output or interface and mounting, and send the details through the RFQ form. Seven Star LLC is an independent supplier, not a SICK partner.
Reviews
There are no reviews yet.