Overview
The Eaton E51DP1 is a photoelectric sensor head designed for the E51 Series modular limit switch platform. It provides retroreflective (reflex) sensing with an 18-foot (5.5 m) detection range and infrared light source. This sensor head operates in standard response mode and pairs with any compatible E51 Series sensor body to create a complete detection system suitable for electrical assemblies, industrial control panels, and OEM automation equipment.
Key Features
- Retroreflective Detection: Detects objects via infrared beam reflection, ideal for non-contact sensing in confined spaces
- 18-Foot Sensing Range: Covers up to 18 feet (5.5 m) with 6-inch diameter field at 15 feet, providing flexibility in system layout
- Fast Response Times: 20 ms ON (AC/DC), 30 ms OFF (AC), 22 ms OFF (DC) for time-critical applications
- Modular Design: Plug-in head mounts to any compatible E51 Series sensor body, reducing inventory and simplifying maintenance
- Dual-Mode Operation: Selector switch enables light and dark operation modes for flexible triggering logic
- Harsh Environment Rating: Viton gaskets, plastic enclosure, NEMA 3/4/4X/6/6P/12/13, IP67 certification for industrial use
Technical Specifications
- Part Number: E51DP1
- Manufacturer: Eaton (Cutler-Hammer Division)
- Series: E51 Limit Switch Style
- Sensing Type: Photoelectric Retroreflective (Reflex Mode)
- Light Source: Infrared Beam
- Maximum Sensing Range: 18 feet (5.5 m)
- Field of View: 6 inches at 15 feet
- Response Time (ON): 20 ms AC/DC
- Response Time (OFF): 30 ms AC, 22 ms DC
- Operating Voltage: 120VAC, 20-264VAC/VDC, 10-30VDC (body dependent)
- Connection: Screw terminal or mini-connector (depends on paired body)
- Enclosure Material: Plastic
- NEMA Rating: 3, 3S, 4, 4X, 6, 6P, 12, 13
- IP Rating: IP67
- Operating Temperature: -13°F to 158°F (-25°C to 70°C)
- Weight: 0.18 lbs (per head unit)
- Certifications: UL, CSA, CE
Typical Applications
The E51DP1 suits a broad range of industrial sensing tasks where non-contact, reflex-based detection is advantageous:
- Conveyor & Material Handling: Package detection and positioning on moving lines
- Assembly Equipment: Part presence/absence detection in automated assembly cells
- Web Inspection: Object counting, label detection, and quality checks
- Machine Tool Control: Workpiece detection and positioning in CNC and punch-press applications
- Packaging Lines: Bottle, box, and container detection at 18-foot range with minimal footprint
- Level and Edge Detection: Reflex mode allows mounting away from the target object when reflectors are used
Compatibility & Replacements
Compatible With
- Eaton E51 Series sensor bodies (all standard models)
- Standard E51 receptacles and mounting brackets
- 120VAC and multi-voltage control systems
- 2-wire and 4-wire sensor architectures
- Industrial automation PLCs and motion control systems
- Standard DIN and U.S. mounting dimensions
Replaces / Drop-In Replacement For
The E51DP1 head is a direct replacement for worn or failed E51DP1 units on existing installations. It is compatible as a retrofit head on any installed E51 sensor body. For extended sensing range applications, the E51DP2 head (26 feet) is available as an upgrade.
Works With
- E51 Series modular sensor bodies and receptacles
- E51SAL, E51SA2, and equivalent DC/AC sensor bodies
- Cutler-Hammer limit switch enclosures and industrial control panels
- Standard industrial reflectors (required for retroreflective operation)
- 24VDC and 120VAC logic modules (for extended control functions)
- EtherNet/IP and standard factory floor networks (via compatible controller integration)
