SICK WFS3-40P115 Fork Sensor – 3 mm Slot, PNP Output
Overview
The WFS3-40P115 is a photoelectric fork sensor based on the opposed emitter–receiver principle, utilizing an infrared LED light source. It is specifically designed for precise detection of labels and thin materials in industrial automation applications.
With a response time of 50 µs and a switching frequency up to 10 kHz, the sensor ensures stable signal processing in applications with fast cycle times. Configuration is performed via a 2-point teach-in function using push buttons, allowing the switching threshold to be optimized according to actual material properties.
Product Overview
The WFS3-40P115 belongs to the WFS3 fork sensor family and is optimized for label gap detection in packaging, printing, and thin material handling applications.
Its fixed slot design eliminates alignment errors typically associated with separate emitter–receiver systems, ensuring consistent detection performance during continuous operation. The device is ideal for systems requiring high reliability, cost efficiency, and no communication interface.
Compared to connector-based variants, the cable-integrated design provides a permanent installation solution, improving connection stability while reducing overall system cost.
Key Features
- Slot width: 3 mm
- Slot depth: 42 mm
- Output: PNP, max. 100 mA
- Configuration: 2-point teach-in via push buttons, dynamic teach-in via cable
- Protection rating: IP65
- Operating temperature: –20°C to +60°C
Technical Specifications WFS3-40P115
| Parameter |
Value |
| Operating principle |
Photoelectric fork sensor (opposed emitter–receiver) |
| Slot width |
3 mm |
| Slot depth |
42 mm |
| Minimum detectable object (MDO) |
≈ 2 mm (depending on contrast and material properties) |
| Supply voltage |
10 – 30 V DC |
| Current consumption |
20 mA (no load) |
| Output |
PNP |
| Output current |
max. 100 mA |
| Response time |
≤ 50 µs |
| Initialization time |
≤ 20 ms |
| Switching frequency |
10 kHz |
| Switching mode |
Light/Dark switching (selectable via button) |
| Connection |
Integrated cable, 4-wire |
| Light source |
Infrared LED |
| Electrical protection class |
Class III |
| Electrical protection |
Reverse polarity & short-circuit protected |
| Signal jitter |
~40 µs |
| Operating temperature |
–20°C to +60°C |
| Storage temperature |
–30°C to +80°C |
| Weight |
approx. 36 g |
Source: SICK Product Datasheet WFS3-40P115, Part No. 6055433. Dowload datasheet
Industrial applications of the WFS3-40P115
- Automatic labeling systems: The sensor is used for accurate label gap detection on carrier materials, even with thin or semi-transparent labels. With fast response and high switching frequency, it ensures stable operation in continuous conveyor systems. The teach-in function enables easy adjustment for different material types.
- Food & pharmaceutical packaging: The device enables label presence verification and detects overlapping labels (double sheet conditions) based on changes in optical signal. The PNP output can be directly interfaced with PLCs for synchronized labeling processes.
- Printing & converting: The sensor is applied to detect label position or material transitions, enabling precise triggering of cutting or positioning systems. Its low latency and stable signal behavior ensure high accuracy in continuous processing, even without registration marks.
- Logistics & sorting systems: Suitable for detecting thin materials such as paper sheets, labels, or envelopes in automated sorting systems. With a switching frequency up to 10 kHz, the sensor ensures reliable detection of individual items without requiring emitter–receiver alignment.
Comparison: WFS3-40P115 vs WFS3-40P415
| Criteria |
WFS3-40P115 |
WFS3-40P415 |
| Part number |
6055433 |
6043919 |
| Connection |
Fixed cable |
M8 connector, 4-pin |
| MDO |
2 mm |
2 mm |
| Output |
PNP |
PNP |
| Best suited for |
Fixed installations, cost optimization |
Flexible connection, easy maintenance |
Selection Guide
- WFS3-40P115 → Ideal for fixed installations, offering stable connectivity and lower system cost.
- WFS3-40P415 → Suitable for systems requiring flexible wiring via M8 connector, enabling quick replacement and maintenance.
Frequently Asked Questions about the WFS3-40P115 (FAQ)
Q1. What is the minimum detectable label size?
A: The WFS3-40P115 can detect objects down to approximately 2 mm, depending on material contrast and optical properties.
Q2. Is the sensor suitable for high-speed applications?
A: Yes. With a 50 µs response time and 10 kHz switching frequency, it performs reliably in fast-cycle systems such as labeling and packaging lines.
Q3. What type of output does the sensor provide?
A: The sensor features a PNP transistor output, compatible with standard industrial PLCs and supporting Light/Dark switching.
Q4. How is the sensor configured?
A: Configuration is done via a 2-point teach-in method using built-in push buttons, allowing quick setup without external tools.
Q5. Where can I purchase the product in Vietnam?
A: The sensor is available through authorized SICK distributors and industrial automation suppliers. It is recommended to choose certified partners for genuine products and technical support.
Contact Information – Purchase WFS3-40P115 Fork Sensor
AUMI – Official authorized distributor of SICK in Vietnam. Full manufacturer warranty, CO/CQ documents, and 24/7 technical support.
📞 Hotline: 0917 991 589 (Hanoi) | 0932 226 100 (Ho Chi Minh City)
📧 Email: [email protected]
🌐 Website: https://aumi.com.vn/
Addresses:
- Hanoi: B44, Villa Area, Viet Hung Urban Zone, Viet Hung Ward
- Ho Chi Minh City: 2nd Floor, HS Building, 260/11 Nguyen Thai Binh Street, Bay Hien Ward
- Da Nang: 9th Floor, PV Bank Building, 2 – 30 Thang 4 Street, Hoa Cuong Ward
