Overview & Technology:
The Leuze PRK28/4P-M12 Polarized Retro-Reflective Photoelectric Sensor belongs to the premier Series 28 product line engineered by Leuze electronic GmbH + Co. KG (Germany) – a global leader in optical sensing and industrial automation. Utilizing visible red LED light combined with an integrated polarizing filter, the sensor reliably differentiates between light reflected from a designated reflector and direct reflections off reflective, shiny target surfaces, completely eliminating false triggers.

Key Features & Highlights:
• Extended Sensing Envelope: Offers dependable detection distances from 0.1 m up to 12 m (paired with standard Leuze reflectors), easily adapting to tight machine spaces as well as wide conveyor spans.
• Advanced Polarization Filtering: Reliably detects high-gloss targets such as metal packaging, polished metal components, shrink-wrapped packages, and transparent plastic containers without false switching.
• Versatile PNP Transistor Output: Supports light/dark switching configurations for seamless interfacing with mainstream PLCs (Siemens, Rockwell, Mitsubishi, Omron, Delta).
• 500 Hz High-Speed Switching: Features ultra-fast response times (≤ 1 ms), effortlessly capturing high-speed parts on automated assembly and packaging lines.
• Dual LED Alignment Diagnostics: Integrated green LED (power/alignment reserve) and yellow LED (switching state output) provide intuitive on-site alignment and fast diagnostics.

Durability & Heavy-Duty Construction:
Encased in a rugged, impact-resistant ABS housing with scratch-resistant PMMA optics, the sensor boasts an IP67 ingress protection rating. It operates reliably across an ambient temperature range from -40°C to +60°C, making it resilient in harsh dusty environments, washdown areas, and cold storage facilities. The standard M12 4-pin circular connector ensures rapid, vibration-proof field wiring.

Practical Value for QA/QC:
Deploying the Leuze PRK28/4P-M12 photoelectric sensor guarantees uninterrupted production flow by preventing misreads, streamlines packaging and sorting accuracy, reduces downtime, and ensures stable automation performance.

• Manufacturer: Leuze electronic GmbH + Co. KG
• Product Category: Polarized Retro-Reflective Photoelectric Sensor
• Model: PRK28/4P-M12 (PRK 28/4P-M12)
• Series: Series 28
• Country of Origin: Germany
• Operating Principle: Retro-reflective with polarization filter
• Light Source: Visible Red LED (~620 nm)
• Operating Range (Sensing Distance): 0.1 ... 12 m (with standard reflector)
• Supply Voltage: 10 ... 30 V DC (including residual ripple)
• Open-Circuit Current: ≤ 20 mA
• Switching Output: Transistor PNP (Light-on / Dark-on configurable)
• Output Current: Max. 100 mA
• Switching Frequency: 500 Hz
• Response Time: ≤ 1 ms
• Connection Type: Standard M12 circular connector, 4-pin
• Status Indicators: Yellow LED (Output state), Green LED (Ready / Alignment reserve)
• Degree of Protection: IP67 (dust-tight and water immersion resistant)
• Housing Material: High-grade ABS plastic with PMMA optical window
• Operating Temperature Range: -40°C to +60°C
• Storage Temperature Range: -40°C to +70°C