Overview
The SICK ET3-P5728 is a photoelectric energetic diffuse sensor designed for industrial automation and motion control applications. This proximity sensor uses diffuse sensing technology to detect objects directly in front of the sensor by detecting its own transmitted light reflected back from an object’s surface. The ET3-P5728 combines reliable performance with a compact form factor, making it ideal for machinery monitoring, material handling, and process automation systems where fast response and accurate detection are critical.
Key Features
- Energetic diffuse sensing principle for direct object detection
- Compact cylindrical design (23.8 mm × 43.4 mm × 33.6 mm) suitable for space-constrained installations
- Fast switching response for high-speed industrial applications
- Reliable detection with minimal adjustment requirements
- Durable construction rated for industrial environments
- Drop-in replacement compatibility with legacy SICK sensor models
Technical Specifications
The following specifications are standard for the ET3-P5728 series:
- Detection Principle: Photoelectric, Energetic, Diffuse
- Housing Material: Nickel-plated brass with plastic optics
- IP Rating: IP67 (sealed against dust and water jets)
- Connector Type: M12 (4-pin configuration)
- Output Type: Digital (PNP)
- Operating Temperature: –25°C to +55°C (–13°F to +131°F)
Typical Applications
- Packaging machinery and conveyor line detection
- Parts counting and material handling systems
- Automated assembly line position sensing
- Intrusion detection and security applications
- Production monitoring and machine control
- Robotic picking and placement guidance
Compatibility & Replacements
Compatible With
- Industrial automation control systems using M12 connectors
- PLC and motion control platforms (Siemens, Allen-Bradley, Mitsubishi, Omron, etc.)
- 24 VDC industrial power supply systems
- Standard industrial networks and digital I/O interfaces
- SICK photoelectric sensor integration ecosystems
Replaces / Drop-In Replacement For
The ET3-P5728 is compatible with legacy SICK diffuse photoelectric sensor models in the ET3 series. For specific model cross-references and compatibility confirmation, verify with your system integrator before ordering, as exact replacement part numbers depend on your original equipment configuration.
Works With
- Standard 24 VDC industrial control circuits
- PLC digital input modules (24 VDC logic-level)
- Industrial Ethernet networks (when used with appropriate gateway modules)
- SICK sensor configuration software and diagnostics tools
- Any automation platform accepting standard digital switching inputs










