Rockwell Automation 871TM-DH8CN18-H2 CE Certified Industrial Proximity Detector

Product Overview

The Allen-Bradley 871TM-DH8CN18-H2 is a premium-grade inductive proximity sensor from Rockwell Automation, engineered for reliable, non-contact metal object detection in demanding industrial environments . This M18 threaded cylindrical sensor belongs to the widely respected 871TM series, known for its robust construction and consistent performance across diverse automation applications. The 871TM-DH8CN18-H2 features an 8mm nominal sensing distance and a 3-wire DC configuration, offering exceptional flexibility for integration with PLCs, relays, and other control system components .

The operating principle of the 871TM-DH8CN18-H2 is based on high-frequency electromagnetic field generation . When a metallic object enters the sensor’s active detection zone, eddy currents are induced in the target, causing oscillation attenuation that triggers the internal switching circuit. This results in a rapid, contact-free output state change, enabling precise position detection and counting without mechanical wear . The Allen-Bradley 871TM-DH8CN18-H2 is distinguished by its all stainless steel tubular housing with a metal sensing face, delivering superior durability against impacts, abrasion, and corrosion . This rugged construction, combined with its IP67 environmental rating, makes the 871TM-DH8CN18-H2 an ideal solution for automated assembly lines, packaging machinery, material handling systems, and other applications requiring reliable metal presence detection in dusty, wet, or oily conditions.

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Description

Technical Specifications

Parameter Name	Value
Product Model	871TM-DH8CN18-H2
Manufacturer	Allen-Bradley / Rockwell Automation
Product Type	Inductive Proximity Sensor, 3-Wire DC Standard Barrel
Barrel Diameter	18mm (M18 x 1 Thread)
Sensing Distance	8mm nominal (0-6.5mm recommended setting distance)
Shielding	Unshielded (Non-flush mounting)
Output Type	NPN (Sink), Normally Closed (N.C.)
Output Current	≤ 200mA (continuous)
Operating Voltage	10-30V DC
Switching Frequency	Up to 1000 Hz
Response Time	≤ 1ms
Hysteresis	≤ 10% of rated sensing distance
Connection Type	ToughLink Cable, 2 meters, #18 AWG
Enclosure Rating	IP67
Housing Material	Stainless Steel tubular, Metal Face
Operating Temperature	-25°C to +70°C
Storage Temperature	-40°C to +85°C
LED Indicator	Red LED for output status
Certification	cULus Listed, CE
Cable Wire Colors	Brown: +V (10-30V DC), Blue: 0V, Black: Signal Output

Main Features and Advantages

Durable, All-Metal Construction: The Allen-Bradley 871TM-DH8CN18-H2 features a stainless steel tubular housing with a metal sensing face, offering exceptional resistance to mechanical impact, vibration, and corrosion . This robust design ensures reliable operation even in harsh industrial environments where plastic-bodied sensors would fail. The 871TM-DH8CN18-H2 can withstand exposure to oils, coolants, and cleaning agents commonly found in machining and automotive manufacturing applications.

Precise and Reliable Detection: The 871TM-DH8CN18-H2 delivers consistent 8mm sensing distance detection for ferrous metal targets. With its high switching frequency of up to 1000 Hz, the Allen-Bradley 871TM-DH8CN18-H2 is well-suited for high-speed counting and position sensing applications . The integrated red LED indicator provides clear visual confirmation of output status, simplifying setup and troubleshooting .

Versatile Integration: The 871TM-DH8CN18-H2 operates on a 10-30V DC supply, providing compatibility with a wide range of industrial control systems and PLC input modules . The NPN (sink) output configuration is standard for most automation controllers, and the 2-meter ToughLink cable offers flexibility for installation in confined or remote locations . The unshielded design of the Allen-Bradley 871TM-DH8CN18-H2 allows greater installation flexibility without significant sensing distance derating .