SICK Background Suppression Photoelectric Sensor, Miniature Sensor, 4 → 220 mm, PNP/NPN, IP66, IP67

SICK WTB4FP Series Photoelectric Sensor, Background Suppression Detection Type, IO-Link Interface - WTB4FP-21311120ZZZ

This photoelectric sensor is a background suppression proximity device designed for industrial automation. It employs a visible pin-point LED beam for detecting objects with high reflectivity and is suitable for installation where robust environmental protection and selectable output polarities are required. The sensor interfaces via IO-Link and connects using an M8 connector, making it appropriate for inline sensing tasks in manufacturing and handling systems.

Features & Benefits

• Detection up to 220mm for extended reach and flexibility
  Adjustable threshold 15mm–220mm for precise background suppression
  Push-pull PNP/NPN output supporting diverse control inputs
  Response time less than or equal to 500μs enabling high-speed switching tasks
  Operating range −40°C to 60°C for harsh environment operation
  IP66/IP67 enclosure rating reducing ingress-related downtime

**Applications**

• Suitable for conveyor object detection where background varies
  Ideal for pick-and-place stations requiring fast response
  Used with PLCs needing selectable PNP or NPN signals
  Can be used for presence sensing of white reference targets
  Suitable for automated inspection lines exposed to washdown

How is the sensing threshold configured?

The sensing range is set using a Teach-Turn adjustment with a BluePilot indicator that shows the Active sensing zone.

What light characteristics determine detection of small parts?

A 635 nm pin-point LED produces a point-shaped spot approximately Ø4.2 mm at 130 mm, allowing detection of objects down to about 0.2 mm at that distance.

What electrical supply and protection are required?

The device accepts 10V–30V DC, consumes less than or equal to 25mA at 24V, and includes reverse-polarity, overcurrent and short-circuit protection on its outputs.

How does the sensor indicate object presence and status?

It uses a blue LED for sensing range, a green LED for power, and a yellow LED to indicate received light and object detection.

What mechanical and mounting considerations apply?

The rectangular plastic housing mounts to walls and uses an M8, 3-pin connector
mounting hardware torque should not exceed 0.4 Nm.