Key Features & Strengths:

Compact Through-Beam Principle: The integrated design provides all the benefits of through-beam sensing—high reliability, high speed, and immunity to object color, surface, or reflectivity—without the need for separate alignment of two devices. This drastically simplifies installation.

Small Object Detection: The narrow gap between the emitter and receiver allows for the detection of very small objects, such as tiny components, wires, or thin labels, that might be missed by other sensor types.

High-Speed Response: Extremely fast response time enables reliable detection of objects moving at very high speeds or in high-frequency counting applications.

Infrared Light Beam: Uses an infrared light beam for detection, providing stable performance and immunity to ambient light interference.

Robust Housing: The housing is typically made from a robust plastic or composite material, designed to withstand the rigors of an industrial environment.

Fixed Cable Connection (3): The "3" in the model number indicates a fixed cable connection (e.g., 2m PVC cable) for a secure and reliable connection.

Clear Status Indication: Integrated LEDs provide clear visual feedback for power (green) and the output switching state (yellow), indicating when the beam is interrupted.

Technical Specifications (General):

Sensing Principle: Through-Beam (Opposed Mode) with integrated transmitter and receiver.

Light Source: Infrared light (e.g., 880 nm)

Sensing Gap (Aperture): The distance between the emitter and receiver is fixed and compact (specific dimensions to be confirmed via datasheet).

Operating Voltage: 10...30 V DC

Output Type: The "P" in the model number indicates a PNP (sourcing) output.

Output Function: The object interrupts the beam (Dark-On operation).

Connection: Fixed cable

Protection Rating: Typically IP67, making it resistant to dust and water ingress.

Typical Applications:
The WTB4-3P1361 is ideal for applications requiring precise, high-speed detection of small objects in a confined space:

Label gap detection on packaging and labeling machinery

Counting and verifying small parts (e.g., electronic components, pills, fasteners) on vibratory bowls or conveyors

Break detection of wires, filaments, or threads in textile and manufacturing equipment

Paper jam detection in printers, copiers, and paper processing machines

Monitoring the presence of objects in automated assembly and handling systems