Allen-Bradley 871TM-BH8N18-N3 Inductive Proximity Sensor: Complete Technical Guide
Allen-Bradley 871TM-BH8N18-N3 Inductive Proximity Sensor
Professional-grade stainless steel inductive proximity sensor for industrial automation applications
Product Overview
The Allen-Bradley 871TM-BH8N18-N3 is a high-performance inductive proximity sensor designed for demanding industrial automation environments. This stainless steel sensor features an 8mm nominal sensing distance and is engineered for reliable metal detection in manufacturing, robotics, and automated systems.
Key Features and Benefits
Stainless Steel Construction
Rugged stainless steel housing provides superior durability and corrosion resistance in harsh industrial environments, ensuring long-term reliability.
8mm Sensing Distance
Optimal sensing range for precise metal detection applications, offering consistent performance across various operating conditions.
AC/DC Versatility
Compatible with both AC and DC power sources, providing flexibility in system integration and reducing inventory requirements.
Normally Open Contacts
AC normally open contact configuration ensures safe operation and compatibility with standard industrial control systems.
Technical Specifications
| Parameter | Specification | Details |
|---|---|---|
| Product Type | Inductive Proximity Sensor | Metal face, short barrel design |
| Model Number | 871TM-BH8N18-N3 | Allen-Bradley part number |
| Nominal Sensing Distance | 8 mm | Standard sensing range |
| Barrel Diameter | 18 mm | Short barrel configuration |
| Output Type | AC Normally Open | Contact configuration |
| Power Supply | AC/DC Compatible | Dual voltage operation |
| Housing Material | Stainless Steel | Corrosion resistant |
| Connection Type | AC Mini Quick Disconnect | Easy installation and maintenance |
| Operating Temperature | -25°C to +70°C | Wide temperature range |
| Protection Rating | IP67 | Dust tight and waterproof |
Application Areas
The 871TM-BH8N18-N3 is ideally suited for various industrial applications including:
- Manufacturing Automation: Position sensing, part detection, and machine guarding
- Robotics: End effector positioning and safety monitoring
- Material Handling: Conveyor systems and pallet detection
- Packaging Machinery: Product counting and positioning
- Automotive Assembly: Component verification and process control
- Food Processing: Stainless steel construction suitable for washdown environments
Installation and Wiring
The sensor features an AC Mini Quick Disconnect connection system for simplified installation. The 18mm barrel diameter allows for standard mounting in industrial applications. The normally open contact configuration provides fail-safe operation, with the contacts closing when metal is detected within the 8mm sensing range.
Industry Trust and Certification
• Allen-Bradley Quality: Manufactured by Rockwell Automation, a global leader in industrial automation
• IP67 Protection: Certified dust tight and waterproof for harsh environments
• Industrial Standards: Complies with international industrial safety and performance standards
• Warranty Support: Backed by comprehensive manufacturer warranty and technical support
Frequently Asked Questions
The sensor is designed to operate with both AC and DC power sources, providing flexibility in various industrial applications. Specific voltage ranges should be verified in the product datasheet for optimal performance.
Yes, as an inductive proximity sensor, the 871TM-BH8N18-N3 can detect both ferrous and non-ferrous metals, though sensing distances may vary depending on the specific metal type and properties.
Normally open (NO) contacts remain open when no target is detected and close when metal is within sensing range. This configuration is commonly used for safety applications and provides fail-safe operation.
Yes, with its stainless steel construction and IP67 protection rating, the 871TM-BH8N18-N3 is suitable for washdown environments commonly found in food processing and pharmaceutical applications.
When properly installed and maintained, Allen-Bradley inductive proximity sensors typically offer millions of operating cycles. The stainless steel construction enhances durability in demanding industrial environments.
Technical References and Citations
Source: Rockwell Automation Technical Specifications
The 871TM-BH8N18-N3 features an 8mm nominal sensing distance with AC normally open contacts and is designed for use with various Allen-Bradley automation systems, enhancing operational efficiency in industrial applications.
Source: Industrial Automation Standards
Inductive sensors with stainless steel construction and IP67 protection are essential for reliable operation in manufacturing lines, robotics, automation, and other industrial processes requiring consistent sensing performance.
Compatibility and Integration
The 871TM-BH8N18-N3 is designed for seamless integration with Allen-Bradley control systems including:
- CompactLogix PLC systems
- ControlLogix platforms
- Micro800 series controllers
- Point I/O modules
- Third-party PLC systems with compatible input modules
The AC Mini Quick Disconnect connection system ensures rapid installation and maintenance, reducing downtime in production environments. The sensor's compact design allows for installation in space-constrained applications while maintaining reliable performance.
Maintenance and Troubleshooting
Regular maintenance of the 871TM-BH8N18-N3 includes:
- Periodic cleaning of the sensing face to remove contaminants
- Verification of mounting integrity and alignment
- Checking electrical connections for corrosion or damage
- Testing sensing performance with known targets
- Monitoring for environmental factors that may affect performance
Common troubleshooting steps include verifying power supply, checking target material and distance, inspecting for physical damage, and confirming proper wiring connections according to the installation diagram.
