SICK WTB4-3 Miniature Photoelectric Proximity Sensor
Overview
The SICK WTB4-3 is a miniature background suppression (BGS) photoelectric proximity sensor engineered for space-constrained detection tasks on packaging lines, conveyors, and small assembly machines. Unlike a standard energetic diffuse sensor, the WTB4-3 uses triangulation-based background suppression so the switching point stays fixed at a defined distance regardless of the target’s color, surface finish, or reflectivity – a critical advantage when detecting dark, light, shiny, or matte objects on the same line without constant re-teaching. Its ultra-compact W4 housing, visible 650 nm red light spot, and single-cable all-in-one design make it one of the most widely specified general-purpose proximity sensors in discrete manufacturing today.
Working closely with plant engineers in the region, Seven Star LLC proudly supplies the WTB4-3 photoelectric proximity sensor to packaging lines, material handling systems, and OEM machine builders across the Sultanate of Oman, Muscat, and the wider GCC region. Technical support with selection means plant engineers can specify and replace the SICK WTB4-3 correctly, with availability and lead time confirmed at quotation.
Operating Principle
The SICK WTB4-3 operates on the diffuse background suppression principle, projecting a modulated red LED light beam onto the target and analyzing the angle at which the reflected light returns to an internal position-sensitive receiving element. Because the sensor evaluates the geometric triangulation angle rather than the raw intensity of the returned light, it reliably switches only when an object is present within the configured sensing window, ignoring background surfaces, machine frames, or conveyor structures positioned beyond that range.
This triangulation approach gives the WTB4-3 a fixed, repeatable switching point that is largely independent of target color and remission – a black rubber component and a white cardboard box positioned at the same distance trigger the output almost identically. As a purely optical, non-contact sensor, it introduces zero mechanical wear, requires no physical contact with the target, and can be freely positioned without concern for pressure, vibration, or process contamination affecting its measurement accuracy.
Engineering Design of the SICK WTB4-3
The physical design of the SICK WTB4-3 concentrates the emitter, receiver, and signal-processing electronics into a single miniature plastic housing measuring only a few centimeters across, allowing installation in tight nip points, star wheels, and small pick-and-place cells where bulkier sensors cannot fit. The rugged ABS/PC housing is rated IP67 for washdown and dusty-environment tolerance, and the sensing face is protected by a scratch-resistant optical window.
Connection is made via an integrated M8 or M12 male connector depending on variant, eliminating pigtail splicing and simplifying field replacement. A background suppression distance adjustment potentiometer or teach-in button sets the switching threshold directly at the sensor, and a bright LED indicator confirms stable detection during commissioning. PNP or NPN switching output variants are available to match existing PLC input card wiring, and the 650 nm visible red spot allows technicians to verify alignment visually without a test target or oscilloscope.
Key Features
The SICK WTB4-3 combines a compact housing with dependable background suppression sensing. Core capabilities include:
- Background suppression (BGS) triangulation sensing that ignores background objects beyond the configured switching distance.
- Detection largely independent of target color, contrast, and surface remission for stable switching on mixed product lines.
- Ultra-compact W4 miniature housing suited to tight installation spaces on packaging and assembly equipment.
- Visible 650 nm red light spot for fast, tool-free alignment and commissioning in the field.
- Sensing range up to 150 mm with an adjustable switching distance potentiometer.
- IP67-rated ABS/PC housing for reliable operation in washdown and dusty industrial environments.
- PNP and NPN switching output variants available with integrated M8/M12 connector for rapid field wiring.
- LED average service life of 100,000 hours, supporting long-term maintenance-free operation.
Industrial Applications
The compact footprint and reliable background suppression of the WTB4-3 make it a standard choice across packaging, food and beverage, and light assembly automation. On high-speed packaging lines and labeling machines throughout Oman’s industrial and free zones, the SICK WTB4-3 detects carton edges, bottle presence, and product gaps with a fixed switching point that holds steady even as product color and finish vary from batch to batch.
With fast quotation turnaround and technical support, Seven Star LLC distributes the WTB4-3 to material handling integrators, food and beverage bottling plants, and OEM machine builders serving the Sohar and Salalah economic zones and wider GCC manufacturing base. Its resistance to false triggering from background structures makes it especially valuable in star wheel infeed systems, small conveyor transfer points, and pick-and-place cells where space is tight and detection accuracy directly affects line throughput.
Technical Specifications
Selecting the correct SICK WTB4-3 variant means matching the sensing range and output type to the application; full technical parameters for the SICK WTB4-3 miniature photoelectric proximity sensor are listed below:
| Parameter | Specification |
|---|---|
| Model | SICK WTB4-3 |
| Sensor Type | Background Suppression (BGS) Photoelectric Proximity Sensor |
| Sensing Range | Up to 150 mm (variant dependent, from 4 mm) |
| Light Source | Visible Red LED, 650 nm wavelength |
| Supply Voltage | 10–30 V DC |
| Current Consumption | ≤20 mA (excluding load) |
| Switching Output | PNP or NPN, Push-Pull configurations available |
| Enclosure Rating | IP67 |
| Housing Material | ABS/PC Plastic |
| Connection Type | Integrated M8/M12 Male Connector |
| LED Service Life | 100,000 hours average at +25°C |
Request a Quote for SICK WTB4-3 Miniature Photoelectric Proximity Sensor
To submit a formal Request for Quote (RFQ), check current availability and lead time, or request complete technical datasheets for the SICK WTB4-3 Miniature Photoelectric Proximity Sensor, please contact Seven Star LLC today. With engineering support in Muscat, our engineers are ready to assist with commercial sourcing and precise sensor selection for your automation project.
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Also available: SICK IME18-08NPSZW2K Inductive Proximity Sensor · SICK DT35-B15251 Laser Distance Sensor
SICK sensor families on this page
The products listed here come from five SICK families. The W4 miniature photoelectric sensors include the WTB4-3, a proximity sensor with background suppression. IME is the standard inductive proximity line, and the IME18 is the M18 housing size. RZT7 cylinder sensors fit T-slot pneumatic cylinders and detect the piston magnet. The DT35 belongs to the Dx35 laser distance sensors for mid-range measurement. The microScan3 is a safety laser scanner that guards hazardous zones around machines and vehicles.Where SICK sensors are used
SICK sensors are fitted on packaging and bottling lines, conveyors, palletizers, warehouse cranes and automated guided vehicles. They are also common on OEM machines in cable, steel, building material and food plants in the GCC. Safety laser scanners protect robot cells and transfer cars. In process plants, the same proximity and cylinder sensors report valve and damper positions on packaged equipment.Ordering SICK sensors: what we need
A SICK type code such as IME18-08NPSZW2K packs the whole specification into one string: housing size, sensing range, flush or non-flush mounting, output type and connection. Each variant also has a 7-digit part number, and that number is the safest identifier. Please send:- Type code and part number from the sensor label, or a photo of it
- Output type (PNP or NPN, normally open or closed) and connection (cable length or M8/M12 plug)
- For microScan3: variant (Core or Pro), interface, protective field range, plus system plug and bracket
Browse SICK products by category: Sensors & Transmitters.
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