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Allen Bradley 42RLL-4000B Photoelectric Retroreflective Sensor

Allen Bradley 42RLL-4000B Retroreflective Photoelectric Sensor

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ManufacturerAllen Bradley

Part number42RLL-4000B

Sensor Type Photoelectric (retroreflective)

Sensing Range Up to 18 meters

Voltage Range 24–240V AC/DC

Output Type SPDT relay

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Long-Range Detection Wide Voltage Support (AC/DC) IP67 Rated SPDT Relay Output Selectable Light/Dark Operate

Product description

The Allen-Bradley 42RLL-4000B is a retroreflective photoelectric sensor designed for general-purpose object detection in industrial environments. It supports a wide operating voltage range of 24–240V AC/DC and features a SPDT relay output for flexible control integration. With an 18-meter sensing range, this sensor is ideal for applications requiring long-distance detection with reliable switching performance.

This sensor is widely used in packaging systems, conveyor lines, automated material handling, object presence detection, and door and gate control. Its durability, with an IP67 enclosure rating, makes it suitable for harsh industrial environments, finding applications across manufacturing, logistics, and automated facilities.

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Technical specifications

Sensor Type	Photoelectric (retroreflective)
Sensing Range	Up to 18 meters
Voltage Range	24–240V AC/DC
Output Type	SPDT relay
Enclosure Rating	IP67
Response Time	≤ 25 ms

Common applications

Packaging Systems

Conveyor Lines

Material Handling

Object Detection

Door Control

Gate Control

Compatible systems

Compatible with industrial control systems that accept SPDT relay inputs.

Also known as

Allen Bradley 42RLL-4000B Photoswitch 4000B Series Retroreflective Sensor Allen Bradley Long Range Sensor

Replaces / compatible with

The 42RLL-4000B is part of the Allen-Bradley 4000B series. Specific replacements depend on application needs and any supersession by the manufacturer.

Technical note

Expert tip

Ensure proper alignment with the reflector for optimal sensing performance up to the maximum 18-meter range.

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Frequently asked questions

What is the maximum sensing distance for the Allen Bradley 42RLL-4000B?

The Allen Bradley 42RLL-4000B photoelectric sensor has a maximum sensing distance of up to 18 meters when used with a reflector. This long range makes it suitable for various industrial applications.