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Allen Bradley 871TM-N20NP18-D4 Inductive Proximity Sensor

Allen Bradley 871TM-N20NP18-D4 inductive proximity sensor.

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ManufacturerAllen Bradley

Part number871TM-N20NP18-D4

Sensing Face 20mm

Housing Thread 18mm

Output Type NPN

Function Normally Open (NO)

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20mm sensing distance 18mm threaded stainless steel body NPN, NO output configuration IP67 rated for harsh environments Robust construction for industrial use Non-contact metallic object detection

Product description

The Allen Bradley 871TM-N20NP18-D4 is an inductive proximity sensor designed with a 20mm sensing face and an 18mm threaded stainless steel housing. This model is configured with an NPN output and provides a Normally Open (NO) contact. It operates within a 10-30VDC voltage range and is protected by an IP67 environmental rating.

This sensor is commonly applied in automation systems for detecting the presence of metallic objects without physical contact. Its NPN output is suitable for direct interfacing with many industrial control systems and PLCs, finding use in machine guarding, parts detection, and positioning tasks across manufacturing environments.

As a veteran-owned surplus parts distributor, Stanlo Automation is dedicated to providing high-quality industrial components. We ensure that parts like the 871TM-N20NP18-D4 are readily available to help our customers minimize lead times and reduce operational costs.

Technical specifications

Sensing Face	20mm
Housing Thread	18mm
Output Type	NPN
Function	Normally Open (NO)
Voltage	10-30VDC
Housing Material	Stainless Steel
IP Rating	IP67

Common applications

Parts presence detection

Machine positioning

Conveyor systems

Robotic cells

Automated assembly

Industrial controls

Compatible systems

Allen Bradley PLCs Industrial automation systems Control panels

Also known as

871TM-N20NP18-D4 switch Allen Bradley proximity NPN NO inductive sensor 18mm thread sensor

Replaces / compatible with

This sensor serves as a direct replacement for other Allen Bradley 871TM series sensors with identical electrical and mechanical specifications. Verify pinout and output type for compatibility.

Technical note

Expert tip

When using an NPN output sensor, ensure your PLC input module is configured to accept sinking inputs.

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Frequently asked questions

What is the output configuration for the Allen Bradley 871TM-N20NP18-D4 sensor?

The 871TM-N20NP18-D4 is an NPN output sensor. When a metallic object is within its 20mm sensing range, it provides a Normally Open (NO) signal, connecting the output to the ground.