The Autonics BJ Photoelectric Sensor delivers precision optical detection, high-speed response capability, and versatile target sensing engineered specifically for automated packaging machinery, conveyor transfer lines, electronic assembly fixtures, and semiconductor material handling skids.

High-Precision Optical Detection with the Autonics BJ Photoelectric Sensor

Engineered for high-density machinery and automated material flow, the Autonics BJ Photoelectric Sensor provides dependable non-contact target acquisition in a miniature rectangular footprint measuring just 10.6 × 32 × 20 mm. Capable of detecting objects at ranges up to 15 meters in through-beam mode, this compact optical switch enables machinery designers to embed sensing points into tight machine tooling axes without sacrificing optical range or signal stability.

The sensor series incorporates advanced optical filtering, including built-in Mirror Surface Rejection (M.S.R.) technology on retroreflective models. By polarizing the emitted light beam and evaluating the phase shift of returning light, the sensor detects mirrored, glossy, and highly reflective packaging materials without generating false switching signals. Constructed with high-grade polybutylene terephthalate (PBT) and acrylic optical lenses, the entire assembly meets rigorous IP65 and IP67 washdown standards, resisting plant water sprays, machine lubrication mist, and airborne dust contamination.

Key Features and Engineering Advantages

• Long-Distance Miniature Sensing: Delivers extended detection envelopes—up to 15 m (Through-beam), 3 m (Retroreflective), and 1 m (Diffuse reflective)—within a compact body profile.
• Polarized M.S.R. Technology: Retroreflective models utilize polarized optical filters to reliably identify mirrored targets, polished stainless steel, and clear plastic wrap.
• High-Speed 1 ms Response: Fast signal acquisition allows accurate part indexing, packaging synchronization, and continuous high-speed conveyor sorting.
• Mutual Interference Prevention: Integrated optical modulation circuits prevent cross-talk interference when two diffuse sensors are mounted in close proximity.
• Rugged Washdown Construction: IP65 / IP67 enclosure standards ensure stable operation in wet packaging areas and harsh industrial production floors.

Technical Specifications

Industrial Applications and Process Integration

The Autonics BJ Photoelectric Sensor is installed across demanding manufacturing facilities and automated sorting installations, including:

• Packaging cartoners, blister card accumulation lines, and shrink-wrap film verification.
• Conveyor parcel indexing, high-speed diverter verification, and roller transfer gaps.
• Automated assembly jigs, electronic circuit board feed tables, and component placement checks.
• Bottling and canning starwheels, cap presence inspection, and label registration timing.

Frequently Asked Questions

How does the Mirror Surface Rejection (M.S.R.) function prevent false detections?
Standard retroreflective sensors can be tricked by glossy or mirrored objects that reflect light straight back into the receiver lens. The Autonics BJ Photoelectric Sensor retroreflective variants emit horizontally polarized light. The dedicated corner-cube reflector rotates this light 90 degrees to vertically polarized light, which passes through the receiver filter. Direct reflections from glossy targets remain horizontally polarized and are blocked, preventing false trigger errors.

Can two BJ series diffuse sensors be mounted side-by-side?
Yes. Diffuse reflective models feature integrated mutual interference prevention circuitry that prevents cross-talk. Two sensors can be mounted adjacent to each other on the same machine bracket without causing errant switching.

What is the difference between Light-ON and Dark-ON operating modes?
In Light-ON mode, the sensor output switches active when light enters the receiver (such as when an object is detected by a diffuse sensor). In Dark-ON mode, the output switches active when the light beam is interrupted (common in through-beam or retroreflective part-breaking detection).