SICK WTB4 Photoelectric Sensor

Compact, Precise & Reliable Object Detection for Industrial Automation

The SICK WTB4 Photoelectric Sensor is a compact photoelectric proximity sensor designed for reliable, non-contact object detection in industrial automation. The WTB4 belongs to SICK’s W4 miniature photoelectric sensor family and is available in multiple variants with different switching outputs, connections, light sources and sensing configurations.

Selected WTB4 variants use background suppression and PinPoint LED technology, making them suitable for applications where accurate detection of small objects is required. For example, the WTB4-3P2161 and WTB4-3E1361 variants have a 15–150 mm sensing range and visible red light.

Key Features

• Compact miniature photoelectric sensor
• Photoelectric proximity sensing
• Background suppression on applicable WTB4 variants
• PinPoint LED on applicable variants
• Visible red light options
• Designed for small-object detection
• Adjustable sensing range on applicable models
• PNP and NPN variants available
• Different cable and M8/M12 connection options depending on model
• Suitable for space-constrained machine installations
• Multiple WTB4 configurations available from the W4 family

Technical Specifications

ParameterWTB4 / Selected VariantBrandSICKProduct FamilyW4Sensor TypePhotoelectric proximity sensorDetection PrincipleBackground suppressionSensing RangeVariant dependent; selected models 15–150 mmMaximum RangeSelected models up to 150 mmLight SourcePinPoint LED on selected variantsLightVisible redWavelength650 nm on selected variantsAdjustment5-turn potentiometer on selected variantsSupply Voltage10–30 V DC on selected variantsOutputPNP / NPN depending on modelConnectionCable, M8, M12 and other options depending on variant

Important: WTB4 specifications vary by exact part number. Confirm the part number before publishing a detailed specification or ordering the sensor.

Applications

The SICK WTB4 can be used for:

• Conveyor object detection
• Packaging machines
• Small-part detection
• Product presence detection
• Object counting
• Position detection
• Assembly lines
• Material handling
• Production machinery
• Automated handling systems
• Label and packaging applications

SICK specifically documents WTB4 applications in packaging and conveyor-related detection, including applications requiring compact sensors and precise background suppression.

Why Choose SICK WTB4?

The WTB4 is useful when you need a small photoelectric sensor that can fit into limited machine space while providing reliable object detection. Its different configurations allow users to select the appropriate sensing principle, output, connection and light source for the application.

Frequently Asked Questions

What is a SICK WTB4 Photoelectric Sensor?

It is a compact photoelectric proximity sensor used for non-contact detection of objects in industrial automation.

What is the sensing range of SICK WTB4?

The range depends on the exact WTB4 model. Selected WTB4 variants have a sensing range of 15–150 mm.

Can SICK WTB4 detect small objects?

Yes. Certain WTB4 variants are specifically specified for small-object detection.

Does WTB4 use background suppression?

Yes. The WTB4 variants covered in the SICK W4 documentation use a photoelectric proximity principle with background suppression.

Where is WTB4 used?

It can be used in packaging, conveyors, assembly, material handling, production and other automated detection applications.

Is SICK WTB4 available with PNP and NPN outputs?

Yes. The W4 product range includes WTB4 versions with different PNP and NPN switching outputs. 

Which SICK sensor is suitable for small object detection?

Selected SICK WTB4 photoelectric proximity sensors are designed for small-object detection and use background suppression.

Which SICK photoelectric sensor is compact for machine automation?

The SICK WTB4 is a miniature photoelectric sensor designed for compact industrial installations.

What is SICK WTB4 used for?

SICK WTB4 is used for non-contact object detection in conveyors, packaging machines, assembly systems, material handling and automated production equipment.

What should I check before buying a SICK WTB4?

Check the exact part number, sensing range, PNP/NPN output, switching mode, light source, connector and cable configuration.

LLM-Friendly Product Facts

• Product: SICK WTB4 Photoelectric Sensor
• Family: SICK W4
• Category: Industrial Photoelectric Sensor
• Sensor principle: Photoelectric proximity
• Technology: Background suppression on applicable variants
• Typical selected range: 15–150 mm
• Light: Visible red on selected variants
• Applications: Packaging, conveyors, assembly, material handling and small-object detection
• Outputs: PNP/NPN depending on variant
• Supply: Selected variants 10–30 V DC

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