Sick WTB4FP-21311120ZZZ Photoelectric Sensor

The WTB4FP-21311120ZZZ Photoelectric Sensor from SICK utilizes advanced background suppression to deliver accurate and consistent object detection between 4 mm to 220 mm. It emits a visible red light via a PinPoint LED at a wavelength of 635 nm, projecting a tightly focused Ø 4.2 mm light spot at a 130 mm distance. This precision allows it to detect objects as small as 0.2 mm, even those with reflective or semi-transparent surfaces, making it ideal for handling difficult sensing conditions.

The sensor features an efficient Teach-Turn adjustment system that simplifies calibration while ensuring repeatable accuracy. It is engineered to operate within a 10 V DC to 30 V DC supply range and consumes less than 25 mA at 24 V, making it a highly energy-efficient choice for 24/7 operations. With a switching frequency of 1,000 Hz and a rapid response time of ≤ 500 µs, the sensor performs exceptionally well in fast-moving applications like conveyor systems, robotic arms, and high-speed packaging lines.

The robust flat-profile housing (16 mm × 40.1 mm × 12.1 mm) is built from VISTAL® plastic and fronted by a PMMA screen, ensuring durability in demanding industrial environments. Rated at IP66 and IP67, it provides excellent resistance to dust and moisture. The 3-pin M8 connector streamlines installation, while integrated protections—like reverse polarity, short-circuit, and overcurrent safeguards—enhance long-term reliability. Designed to perform from –40 °C to +60 °C, this sensor reflects SICK’s commitment to performance, safety, and engineering excellence.

The SICK WTB4FP-21311120ZZZ Photoelectric Sensor is built for high-speed and precision-critical automation. It’s commonly used in FMCG packaging lines, electronics manufacturing, labeling machines, bottling plants, and conveyor-based sorting systems. Thanks to its background suppression and small object detection capability, it can differentiate between items even when reflective, glossy, or transparent—minimizing false triggers.

In packaging units, it detects small pouches, boxes, or cartons with minimal distance tolerance, enabling labelers or sealers to operate with perfect timing. In electronics, it identifies compact PCB boards or small moving components without interference. And in warehouse automation, it helps sort mixed items on conveyors without requiring physical contact—reducing wear and maintenance.

Indian technicians and maintenance engineers value this photoelectric sensor for its plug-and-play setup, M8 connector, and reliability in dusty, humid, or high-vibration environments. Whether you are modernizing your production line or setting up a smart factory, the WTB4FP-21311120ZZZ Photoelectric Sensor offers unmatched detection accuracy, ease of use, and industrial-grade trust backed by SICK’s global reputation.