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The SICK WTB9-3P2461 is a compact background suppression photoelectric sensor from the W9 series, with order number 1049049. Featuring background suppression capability, it reliably distinguishes objects from backgrounds and is suitable for harsh industrial environments.
- Model Code Explanation
| Model Part | Description |
| WTB9 | Basic model of W9 series diffuse-reflection photoelectric sensor, square housing |
| -3 | W9-3 sub-series, standard sensing distance (20–350 mm) |
| P | PNP output type |
| 24 | Light/dark switching function, complementary output |
| 61 | Specific configuration code, M12 connector, potentiometer adjustment, background suppression |
- Key Technical Specifications
- Basic Features
| Item | Value |
| Sensing principle | Diffuse-reflection photoelectric sensor with background suppression |
| Sensing range | 20 mm … 350 mm (90% reflective object), 20 mm … 200 mm (6% reflective object) |
| Light source | Visible red light PinPoint LED, wavelength 650 nm, service life 100,000 hours (@25°C) |
| Spot size | Ø4.5 mm (at 75 mm), Ø6 mm (at 200 mm), Ø6.5 mm (at 400 mm) |
| Adjustment | Potentiometer, 5-turn adjustment |
- Electrical Specifications
| Item | Value |
| Supply voltage | 10 V DC … 30 V DC, ripple < 5 Vpp |
| Current consumption | 30 mA (no load) |
| Output type | PNP, complementary output, light/dark switching |
| Max. output current | ≤ 100 mA (≤ 50°C), ≤ 50 mA (≥ 50°C) |
| Response time | < 0.333 ms |
| Switching frequency | 1,500 Hz (50% duty cycle) |
| Connection | 4-pin M12 male connector |
| Circuit protection | Polarity reversal protection, I/O protection, interference suppression |
- Mechanical & Environmental Parameters
| Item | Value |
| Dimensions (W×H×D) | 12.2 mm × 52.2 mm × 23.6 mm |
| Weight | 13 g |
| Housing material | VISTAL® plastic, lens material PMMA |
| Protection class | IP66, IP67, IP69K |
| Operating temperature | -40°C … +60°C |
| Storage temperature | -40°C … +75°C |
| Mounting holes | M3, pitch 19.6 mm between two holes |
- Operating Environment & Applications
Suitable environment: Harsh industrial environments, resistant to high-pressure washing (IP69K), ideal for food & beverage, pharmaceutical, packaging industries (ECOLAB certified)
Typical applications:
Presence detection and positioning on conveyor systems
Product counting and sorting in packaging machinery
Detection of small workpieces in confined spaces
Transparent object detection
Reliable object recognition against complex backgrounds
Checking for protrusions or misalignment
- Installation & Wiring
Mounting: Secured via two M3 mounting holes; recommended mounting bracket BEF-WN-W9-2 (order no. 2022855)
Connection: 4-pin M12 male connector
Pin assignment: 1 (BN) = +V, 2 (WH) = Q (output), 3 (BU) = 0V, 4 (BK) = not used
Recommended cable: YF2A14-050VB3XLEAX (5 m, 4-wire, PVC, M12 connector)
- Replacement Models & Series Information
- Replacement Models from SICK Same Series
| Model | Main Difference | Order No. |
| WTB9-3P2261 | No background suppression | 1049047 |
| WTB9-3N2461 | NPN output | 1049048 |
| WTB9L-3P2461 | Long sensing distance version | 1058231 |
| WTB9M4-3P2461 | Metal housing version | 1051891 |
- Alternative Models from Other Brands
| Brand | Model | Key Matching Features |
| Pepperl+Fuchs (P+F) | RL31-8-H-300-RT/73c/136 | Background suppression, 300 mm range, PNP output |
| OMRON | E3Z-D61 | Background suppression, 200 mm range, PNP output |
| Schneider Electric | XUDA30ANM12 | Background suppression, 300 mm range, PNP output |
- Main Product Types in W9 Series
WTB9-3 series: Diffuse-reflection, background suppression, standard sensing distance
WL9-3 series: Retro-reflective, auto-alignment, long-range detection
WSE9-3 series: Through-beam, high reliability, ultra-long sensing distance
WTF9-3 series: Fiber optic amplifier for special detection scenarios
- Safety & Certifications
Protection class: IP66, IP67, IP69K
Safety class: Class III (SELV)
Certifications: CE, ECOLAB, cULus, China-RoHS, Photobiological safety (DIN EN 62471)
Safety parameters: MTTFD = 1,030 years, DCavg = 0%, TM (service life) = 20 years
- Ordering & Delivery
Standard model: WTB9-3P2461, order number 1049049
Packaging: Single unit packaging, standard delivery includes sensor only
Recommended accessories: BEF-WN-W9-2 mounting bracket (2022855), STE-1204-G connector (6009932)
Complete Model List of SICK W9 Series Photoelectric Sensors (with Order Numbers)
- Series Overview
The SICK W9 series consists of compact square photoelectric sensors with a rugged VISTAL® housing, with uniform dimensions of 12.2 mm × 52.2 mm × 23.6 mm (except metal housing versions). They feature IP66/IP67/IP69K protection and are designed for harsh industrial environments. They are divided into four categories by sensing principle: WTB9 diffuse-reflection (background suppression), WL9 retro-reflective (auto-alignment), WSE9 through-beam, and WTF9 fiber optic amplifiers.
- WTB9 Series (Diffuse-Reflection, Background Suppression)
Standard Sensing Distance Version (20-350 mm)
| Model | Order No. | Output | Connection | Adjustment | Notes |
| WTB9-3P2261 | 1049047 | PNP | M8 plug | Potentiometer | No background suppression |
| WTB9-3P2461 | 1049049 | PNP | M12 plug | Potentiometer | Background suppression (customer requested model) |
| WTB9-3N2461 | 1049053 | NPN | M12 plug | Potentiometer | Background suppression |
| WTB9-3P3461 | 1049051 | PNP | Cable with M12 plug | Potentiometer | Background suppression |
| WTB9-3N1161 | 1049052 | NPN | 4-wire cable | Potentiometer | Background suppression |
| WTB9-3P2411 | 1049048 | PNP | M12 plug | Potentiometer | Different configuration code |
Long-Range Version (WTB9L, 25-300/400 mm)
| Model | Order No. | Output | Connection | Light Source | Notes |
| WTB9L-3P2261 | 1058230 | PNP | M8 plug | Laser | 25–300 mm range |
| WTB9L-3N2261 | 1062523 | NPN | M8 plug | Laser | 25–300 mm range |
| WTB9L-3P2461 | 1058231 | PNP | M12 plug | Laser | 25–400 mm range |
| WTB9L-3N2461 | 1062524 | NPN | M12 plug | Laser | 25–400 mm range |
| WTB9L-3P2291 | 1058229 | PNP | M8 plug | Laser | Special configuration |
| WTB9L-3N1191 | 1068515 | NPN | 4-wire cable | Laser | Special configuration |
Metal Housing Version (WTB9M4)
| Model | Order No. | Output | Connection | Features |
| WTB9M4-3P2461 | 1051891 | PNP | M12 plug | Metal housing, enhanced durability |
| WTB9M4L-3P2291 | 1058224 | PNP | M8 plug | Long-range, metal housing |
| WTB9-3P3461S13 | 1050772 | PNP | Cable with plug | Special version |
Other Configurations
| Model | Order No. | Special Function |
| WTB9-3P2411 | 1049048 | Light/dark switching, complementary output |
| WTB9-3N1111S14 | 1051889 | Special configuration |
- WL9 Series (Retro-Reflective, Auto-Alignment / Coaxial Optics)
Standard Range Version (0-4000 mm)
| Model | Order No. | Output | Connection | Adjustment | Notes |
| WL9-3P2230 | 1049059 | PNP | M8 plug | None | 0–4000 mm range |
| WL9-3P2430 | 1049062 | PNP | M12 plug | None | 0–4000 mm range |
| WL9-3P2262 | 1049058 | PNP | M8 plug | Teach-in button | 0–400 mm range |
| WL9-3P2462 | 1049061 | PNP | M12 plug | Teach-in button | 0–400 mm range |
| WL9-3P3432 | 1049067 | PNP | Cable with plug | Teach-in button | 0–5000 mm range |
Long-Range Version (WL9L, 0-12000 mm)
| Model | Order No. | Output | Connection | Light Source | Notes |
| WL9L-3P2232 | 1058174 | PNP | M8 plug | Laser | 0–12000 mm range |
| WL9L-3P2432 | 1058175 | PNP | M12 plug | Laser | 0–12000 mm range |
Transparent Object Detection Version (WL9G)
| Model | Order No. | Output | Connection | Features | Sensing Range |
| WL9G-3P2432 | 1049083 | PNP | M12 plug | Transparent object detection | 0–5000 mm |
| WL9G-3N2432 | 1054152 | NPN | M12 plug | Transparent object detection | 0–5000 mm |
| WL9G-3E2432 | 1096364 | NPN | M12 plug | Transparent object detection | 0–5000 mm |
| WL9G-3N1234S02 | 1058701 | NPN | 4-wire cable | Transparent detection, 3000 Hz | 0–700 mm |
Metal Housing Version (WL9M4)
| Model | Order No. | Output | Connection | Features | Sensing Range |
| WL9M4-3N2232 | – | NPN | M8 plug | Metal housing | 0–5000 mm |
| WL9M4G-3P2432 | – | PNP | M12 plug | Metal housing, transparent detection | 0–5000 mm |
- WSE9 Series (Through-Beam)
Standard Version (0-10000 mm)
| Model | Order No. | Output | Connection | Notes |
| WSE9-3P2430 | 1049077 | PNP | M12 plug | 0–10000 mm range |
| WSE9-3N2430 | 1049078 | NPN | M12 plug | 0–10000 mm range |
Long-Range Version (WSE9L, 0-60000 mm)
| Model | Order No. | Output | Connection | Light Source | Notes |
| WSE9L-3P2237 | 1058182 | PNP | M8 plug | Laser | 0–60000 mm range |
| WSE9L-3P2437 | 1058181 | PNP | M12 plug | Laser | 0–60000 mm range |
Compact Long-Range Version (WSE9LC)
| Model | Order No. | Output | Connection | Features | Notes |
| WSE9LC-3P3436A00 | – | PNP | Cable with plug | Compact design | 0–60000 mm range |
- WTF9 Series (Fiber Optic Amplifiers)
| Model | Order No. | Output | Connection | Adjustment | Notes |
| WTF9-3P2411 | 1049071 | PNP | M12 plug | Potentiometer | Fiber optic amplifier |
| WTF9-3N2411 | 1049072 | NPN | M12 plug | Potentiometer | Fiber optic amplifier |
| WTF9-3P3411 | 1049073 | PNP | Cable with plug | Potentiometer | Fiber optic amplifier |
- Special & Derivative Models
Metal Housing Versions (M4 Suffix)
Suitable for high mechanical stress environments with metal housing and unchanged protection ratings.
WTB9M4-3P2461 (1051891)
WL9M4-3N2232
WL9M4G-3P2432
Special Function Versions
| Model | Order No. | Special Function | Notes |
| WTB9-3P3461S13 | 1050772 | Special configuration | Cable with plug |
| WL9G-3N1234S02 | 1058701 | 3000 Hz switching frequency, light-on | Transparent object detection |
| WTB9-3P2411S14 | 1058702 | Special configuration | Background suppression |
- Model Naming Convention
WTB9-3P2461 = WTB9 (series)-3 (sub-series)-P (PNP output)-24 (M12 plug, complementary output)-61 (background suppression, potentiometer adjustment)
Key Code Meanings
| Code Position | Meaning | Options |
| Output type | 4th digit | P = PNP, N = NPN, E = NPN |
| Connection | 5th–6th digits | 22 = M8 plug, 24 = M12 plug, 34 = cable with plug, 11 = cable |
| Function config | 7th–8th digits | 61 = background suppression + potentiometer, 62 = teach-in button, 30 = standard function |
- Selection Guide
- By sensing distance: Standard range-WTB9/WL9/WSE9; long range-WTB9L/WL9L/WSE9L (laser source)
- By output type: PNP (P) or NPN (N/E)
- By connection: M8 plug (22), M12 plug (24), cable with plug (34), or direct cable (11)
- By special requirements: Transparent object detection-WL9G series; high mechanical stress-M4 metal housing; background suppression-WTB9 series with code 61
- This list is based on the official SICK 2025-2026 catalog, covering 209 models in total.
- Some models may change due to product updates or discontinuation. Please verify latest status on the SICK website before ordering.
- The entire series is ECOLAB certified for high-pressure washing in food & beverage and pharmaceutical industries.
- Recommended accessories: BEF-WN-W9-2 mounting bracket (2022855), STE-1204-G connector (6009932)
