Mini Tubular Sensors

Bulletin 871C Mini Tubular Sensors are self-contained, general purpose, solid-state devices designed to sense the presence of ferrous and nonferrous metal objects without touching them. These small-barrel sensors are designed for space-critical applications where standard size sensors simply won't fit.

Popular Resources/Quicklinks
Presence Sensing Brochure Bulletin 871C Mini Tubular Proximity Sensors with IO-Link Product Profile Inductive Proximity Sensors Technical Data


  • Incorporates embedded IO-Link communication protocol in select 871C sensors to help minimize downtime and increase productivity
  • IO-Link enabled sensors offer advanced features and diagnostics including Automatic Device Configuration, multiple profiles, trending, descriptive tags, and device specific parameters
  • 3-wire operation
  • 3-conductor, 3-pin pico, or 3-pin 6 inch lead
  • 3 mm, 4 mm, and 5 mm barrel diameters
  • 10…30V DC
  • Normally open
  • False pulse, transient noise, reverse polarity, and short circuit protections
Additional Information
Sensors on IO-Link Can Enable the Connected Enterprise

Watch how smart sensors with IO-Link can enable smart machines for The Connected Enterprise.

IO-Link Technology

IO-Link Technology is a worldwide open-standard protocol that integrates sensors into our Connected Enterprise by connecting the IO-Link enabled device into an IO-Link master module. You can deliver data from the sensor directly into a control system in a very efficient manner. The flexibility of IO-Link capable sensors allows machines to operate more effectively by providing the controller with diagnostics. In addition to product detection, sensors provide detailed and accurate machine health status to improve uptime.

Product Selection


  • CE Marked for all applicable directives
  • IO-Link
Looking for Additional Information?

To find additional product information including CAD drawing files, 3D models and more use our Product Catalog.


Resource Publication Number Language
Presence Sensing Brochure SENSOR-BR001
Bulletin 871C Mini Tubular Proximity Sensors with IO-Link Product Profile 871C-PP001
Inductive Proximity Sensors Technical Data PROX-TD001
871C Miniature Inductive Sensors with IO-Link Interface User Manual 871C-UM001
Integrated Smart Sensor Solution Quick Reference Guide IOLINK-SP001
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Typical applications for the Mini Tubular Sensors include:

  • Light-duty packaging applications
  • Automotive welding equipment
  • Food-processing plants

Product Application Library — View our product application library to discover how customers have applied Allen-Bradley sensing products.