SICK WTB4FP-213111A0ZZZ — W4F Series Photoelectric Sensor (Background Suppression, Multipulse)
Overview

The WTB4FP-213111A0ZZZ is a compact background-suppression photoelectric proximity sensor in the W4F / W4 family by SICK. Designed for detecting objects reliably against various backgrounds, it includes multipulse machine-level self-monitoring features, and integrates with industrial systems via a 3-pin M8 connector.
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Key Specifications
Feature Specification
Sensing Method Background suppression (diffuse) with multipulse function
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Sensing Range 28 mm to 165 mm nominal
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Smallest Detectable Object (MDO) Typ. 0.2 mm at 130 mm for object with 90% remission
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Output Type Push-pull (PNP / NPN)
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Switching Mode Light / Dark selectable
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Power Supply 10 V to 30 V DC
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Connection 3-pin M8 connector
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Dimensions 16 mm × 40.1 mm × 12.1 mm (W × H × D)
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Housing / Material Plastic housing (VISTAL®), PMMA front screen
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Protection & Environment IP66 / IP67 rating; operating temperature –40 °C to +60 °C; storage –40 °C to +75 °C
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Light Source / Wavelength PinPoint LED, visible red light (≈ 635 nm)
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Response / Switching Speed Typical response ~ 500 µs (max)
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Certifications & Standards Conforms to EN/IEC standards, CE, UL / cULus, RoHS etc.
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Engineering Highlights

Multipulse Self-Monitoring
The sensor features multipulse monitoring, which allows the detection of internal faults during operation to increase reliability in automation systems.
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Excellent Background Suppression
It can reliably detect objects even when backgrounds vary in color or reflectivity, avoiding false triggers.

Compact Design
With a slim 16 mm width and low profile, it fits into tight mounting spaces.

Flexible Output Interface
Push-pull output supports both PNP and NPN logic, easing integration with different control systems.

Broad Environmental Performance
The wide temperature range and high ingress protection make it suitable for harsh industrial settings.

Fine Object Detection
A minimum detectable object size as low as 0.2 mm (typical) enables detection of small targets in precise tasks.

Use Cases & Recommended Applications

Part detection on conveyor systems where background surfaces are variable

Quality control systems detecting small edges, labels, or transparency

Robotics end-of-arm tooling for object presence checks

Retractable guards or gates requiring compact sensors with self-diagnostic ability

Retrofitting lines where space is limited but accurate short-to-medium distance sensing is necessary