872C-D5NP18-D4 | Allen-Bradley 18 mm inductive proximity sensor, 5 mm range, PNP NO, shielded, Micro QD

The Allen-Bradley 872C-D5NP18-D4 is an inductive proximity sensor designed to detect metallic objects without physical contact. It uses a shielded sensing face and operates with a 5 mm sensing range, providing precise detection in confined spaces. The device works on a 10–30V DC supply and features a PNP Normally Open output, making it compatible with many automation controllers. Its non-contact detection ensures extended sensor life and minimizes maintenance. This sensor is ideal for applications such as presence detection on conveyors or machine tools.

1. Identify the Connector
   This sensor uses a 4-pin Micro DC quick-disconnect (M12) connector. Wiring is based on the IEC color code standard.
2. Connect the Wires According to the Pinout
   Use the following pin configuration:

• Pin 1 (Brown): +VDC (10–30V DC supply)
• Pin 3 (Blue): 0V (DC Ground)
• Pin 4 (Black): Output signal (PNP Normally Open)
• Pin 2 (White): Not used for standard operation (optional, depending on system)

3. Connect to the Load or PLC

• Wire the output (Pin 4) to the digital input of your PLC or control device.
• Make sure the PLC input is designed for PNP logic (positive switching).

4. Power On and Test

• Apply power (between 10–30V DC).
• Place a metal object within 5 mm of the sensing face to verify the output response.
• Use the LED indicator (if available) to confirm switch activation.
  

5. Secure the Connection

• Ensure the connector is tightly fastened.
• Route the cable away from high-voltage wiring and mechanical hazards.

This proximity sensor is inductive, so it is designed to detect only metal objects. It does not respond to plastic, glass, or other non-metallic materials. The best sensing performance is achieved with ferrous metals such as steel. It can also detect aluminum and copper, although with slightly reduced sensing range. It is typically used for detecting metal parts in automation lines, packaging equipment, or assembly systems.

Yes, this sensor is designed with a rugged nickel-brass body and shielded sensing face, making it suitable for industrial settings with exposure to vibration, dust, or moisture. The sensor's IP67 rating ensures protection against water ingress and particulate matter. Additionally, its quick-disconnect design helps simplify replacement and minimize downtime. It can withstand fluctuating temperatures and harsh process conditions. It is frequently used in applications where durability and repeatability are critical.

Yes, the Allen-Bradley 872C-D5NP18-D4 is currently in active production. It remains a widely used component in industrial automation and machine control systems. Its availability makes it suitable for both new installations and replacement in existing systems.