Pepperl+Fuchs RLK31-54_31_115 Retroreflective Sensor

USD 74.16

Universal voltage retroreflective photoelectric sensor with 9m range, polarized filter, relay output, IP67 protection, and compact housing.

SKU PEPPERL-FUCHS-RLK31-54/31/115 Category
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Pepperl+Fuchs RLK31-54/31/115 Retroreflective Sensor

Model Identifier RLK31-54/31/115
Official Part Number RLK31-54/31/115
GTIN Standard 4050143016662

Technical Overview

The Pepperl+Fuchs RLK31-54/31/115 is a cost-optimized retroreflective photoelectric sensor designed for standard industrial applications. It features a compact yet robust plastic housing with a polarized filter, offering an effective detection range of up to 9 meters. This universal voltage sensor operates with both AC and DC supplies and provides a reliable relay output with a dark-on switching type, making it suitable for versatile control tasks in various environments. It is equipped with a fixed 2-meter cable and boasts an IP67 degree of protection for harsh conditions.

Key Features

  • Cost-optimized series for standard applications.
  • Compact and robust plastic housing.
  • Universal voltage version: 12-240 V DC / 24-240 V AC.
  • Relay output with 1 changeover contact (alternator).
  • Retroreflective sensing method with polarization filter.
  • Effective detection range of 0 to 9000 mm.
  • Visible red light LED (630 nm).
  • Dark-on switching type.
  • Degree of protection IP67.
  • Fixed 2-meter cable connection.

Universal voltage operation (12-240V DC, 24-240V AC) combined with a robust relay output ensures broad compatibility and reliable switching in diverse industrial setups.

Technical Specification Matrix

ParameterValue
Effective Detection Range0 ... 9000 mm
Reflector Distance20 ... 9000 mm
Threshold Detection Range12 m
Light SourceLED, modulated visible red light, 630 nm
Polarization FilterYes
Light Spot DiameterApprox. 200 mm at 6 m distance
Angle of Divergence3 °
Ambient Light Limit50000 Lux
Operating Voltage (UB)24 ... 240 V AC / 12 ... 240 V DC
No-load Current (I0)≤ 40 mA
Power Consumption (P0)≤ 2 VA
Switching TypeDark-on
Signal OutputRelay, 1 changeover contact
Max Switching Voltage240 V AC
Max Switching Current3 A
Max Switching Capacity (DC)150 W
Max Switching Capacity (AC)750 VA
Switching Frequency (f)20 Hz
Response Time≤ 25 ms
Ambient Temperature-25 ... 55 °C (-13 ... 131 °F)
Storage Temperature-40 ... 70 °C (-40 ... 158 °F)
Degree of ProtectionIP67
ConnectionFixed cable 2 m
Housing MaterialPolycarbonate (PC)
Optical Face MaterialPMMA

Industrial Applications

1. Conveyor Belt Object Detection in Warehouses

This sensor can reliably detect the presence or absence of packages and items on a conveyor belt system, particularly useful in logistics and sorting facilities. Its 9-meter range allows for detection across wider belts or at various points along the line. The polarized filter helps reduce false triggers from reflective surfaces of packaging.

Problem Solved

Ensures accurate material flow control, prevents jams, and confirms item presence for automated packaging or sorting processes.

Object detectionconveyor systemsmaterial handlinglogisticspackage sortingpolarized retroreflectiveIP679m range

2. Gate/Door Monitoring in Industrial Environments

The sensor can be used to monitor the open/closed status of large industrial gates or doors, providing a robust solution for safety interlocks or access control in factories and loading docks. The IP67 rating ensures durability in harsh conditions, and its universal voltage facilitates easy integration.

Problem Solved

Enhances operational safety by confirming door positions and prevents machinery operation if a door is open, while also streamlining access control.

Safety interlockaccess controlgate monitoringindustrial doorsIP67universal voltagerelay outputambient temperature

3. Level Detection in Non-Transparent Bins/Hoppers (External Mount)

Positioned externally, the sensor can detect material levels in large, non-transparent bins or hoppers by detecting a reflector on the opposite side. When material blocks the beam, the relay output changes state, indicating a full or empty condition. The 9m range is suitable for larger containers.

Problem Solved

Provides simple, non-contact level sensing for bulk materials without requiring the sensor to be submerged or exposed to the material directly, avoiding contamination or wear issues.

Level detectionbulk materialhopper monitoringnon-contact sensingindustrial automationretroreflective sensor9m rangerelay output
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