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Brand: SICK
SICK WL9LG-3P2452 W9 Retro-Reflective Sensor
Description
WL9LG-3P2452 is a SICK W9 retro-reflective photoelectric sensor (part no. 1076048) that sends a light beam to a reflector and switches when an object interrupts it. The catalogue summary lists: functional principle: Photoelectric retro-reflective sensor; switching output: PNP; switching mode: Light/dark switching; connection type: Male connector M12, 4-pin; light source: Laser.
WL9LG-3P2452: function, principle and typical use
The reflector is part of the system. A triple reflector returns the light to the sensor even when it is not perfectly aligned, and the sensing range in the table depends on the reflector type used for the measurement, so a smaller reflector or a dirty one shortens the usable range.
Laser or PinPoint light sources produce a small visible spot that makes alignment easier and allows small objects to be detected; the class of the light source, as printed in the data sheet, tells what safety precautions apply. A good margin means the sensor will keep working when dust builds up.
Technical specifications
| Parameter | Specification |
|---|---|
| Type code | WL9LG-3P2452 |
| Part number | 1076048 |
| Product family | W9 |
| Functional principle | Photoelectric retro-reflective sensor |
| Functional principle detail | Without reflector minimum distance (autocollimation/coaxial optics) |
| Dimensions (W x H x D) | 12.2 mm x 52.2 mm x 23.6 mm |
| Housing design (light emission) | Rectangular |
| Mounting hole | M3 |
| Sensing range max. | 0 m … 3.5 m; |
| Sensing range | 0 m … 2.2 m; |
| Light source | Laser |
| Light spot size (distance) | Ø 0.4 mm (60 mm) |
| Laser class | 1 (IEC 60825-1 / CDRH 21 CFR 1040.10 & 1040.11) |
| Adjustment | Single teach-in button |
| AutoAdapt | Yes |
| Special applications | Detecting small objects, Detecting transparent objects |
| Supply voltage UB | 10 V DC … 30 V DC |
| Current consumption | 30 mA |
| Switching output | PNP |
| Output function | Complementary |
| Switching mode | Light/dark switching |
| Output current Imax. | ≤ 100 mA |
| Response time | ≤ 0.5 ms |
| Switching frequency | 1,000 Hz |
| Connection type | Male connector M12, 4-pin |
| Circuit protection | A; B; C |
| Weight | 13 g |
| Polarizing filter | Yes |
| Housing material | Plastic, VISTAL® |
| Optics material | Plastic, PMMA |
| 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; cULus certificate; Laser safety (IEC 60825-1) certificate |
Type code WL9LG-3P2452 and what to check before ordering
For the control cabinet and the cable run, the relevant figures are outputs PNP; range 0 m … 3.5 m;; current 30 mA; frequency 1,000 Hz; connection male connector M12, 4-pin; response time ≤ 0.5 ms; supply 10 V DC … 30 V DC.
For the mounting location, note operating temperature: –10 °C … +50 °C; enclosure rating: IP66; IP67; IP69K; light source: visible red light; housing: plastic, VISTAL®; dimensions: 12.2 mm x 52.2 mm x 23.6 mm; wavelength: 650 nm; weight: 13 g.
Compare the complete type code with the unit being replaced.
Typical uses are detection of boxes and containers on conveyors, door and gate monitoring, pallet and vehicle presence, and counting in packaging machines.
Related SICK products: SICK WL4SLG-3P5254H W4 Retro-Reflective Sensor, SICK WL4SL-3P2232 W4 Retro-Reflective Sensor, SICK WL12G-3V2572 Retro-Reflective Sensor, SICK GL6G-P4211 Retro-Reflective Sensor, SICK WLA16P-24162100A00 Retro-Reflective Sensor and SICK WL9-3P2462 Retro-Reflective Sensor for Small Objects.
Documents and quotation
The official SICK data sheet for WL9LG-3P2452 (part no. 1076048) is attached as a PDF. Send the type code, quantity and delivery location through the RFQ form and Seven Star LLC, an independent supplier in Muscat, will respond with a quotation. Similar products sit under Sensors & Transmitters. Confirm the full code against the device it replaces; if this page and the data sheet ever disagree, follow the data sheet.
Datasheets & Documents
- Datasheet SICK WL9LG-3P2452 official data sheet (part no. 1076048) Download
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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.
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Frequently Asked Questions
What is the SICK WL9LG-3P2452?
It is a SICK retro-reflective sensor (W9), part no. 1076048. The catalogue summary reads: Functional principle: Photoelectric retro-reflective sensor; Switching output: PNP; Switching mode: Light/dark switching; Connection type: Male connector M12, 4-pin.
What supply does the WL9LG-3P2452 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; 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. 1076048 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 WL9LG-3P2452?
Compare the full type code and part number 1076048 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.
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