Pepperl+Fuchs RLK31-6_31_115 Retroreflective Sensor

USD 63.36

Robust IP67 retroreflective sensor with 14m range, universal 24-240V AC/DC operation, and SPDT relay output for standard industrial detection.

SKU PEPPERL-FUCHS-RLK31-6/31/115 Category
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Pepperl+Fuchs RLK31-6/31/115 Retroreflective Sensor

Model Identifier RLK31-6/31/115
Official Part Number RLK31-6/31/115
GTIN Standard NA

Technical Overview

The Pepperl+Fuchs RLK31-6/31/115 is a cost-optimized retroreflective sensor designed for standard industrial detection tasks. It features a plastic housing, a 14 m effective detection range, and uses modulated visible red light. This AC/DC version offers a relay contact output (1 alternator/SPDT) and is equipped with a fixed cable. It operates with dark-on switching and provides universal voltage compatibility, making it suitable for diverse industrial environments.

Key Features

  • Cost-optimized series for standard detection tasks
  • Large construction with compact housing design
  • Version for universal voltages (24-240 V AC / 12-240 V DC)
  • Relay output: 1 alternator (SPDT) for versatile control integration
  • Effective detection range of 14 meters
  • Utilizes modulated visible red light (630 nm)
  • Dark-on switching type
  • Durable plastic housing
  • Fixed 2m cable connection for reliable installation
  • High degree of protection, rated IP67
  • Operating ambient temperature range of -25 to 55 °C

Universal AC/DC voltage compatibility with reliable relay output for diverse industrial sensing applications.

Technical Specification Matrix

ParameterValue
Effective Detection Range14 m
Reflector Distance200 ... 14000 mm
Threshold Detection Range16.5 m (with H85-2 reflector)
Light SourceLED, modulated visible red light, 630 nm
Polarization FilterNo
Diameter of Light SpotApprox. 240 mm at 8 m distance
Opening Angle
Ambient Light Limit50000 Lux
MTTFd790 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Operation IndicatorLED green: power on
Function IndicatorLED yellow (signal strength indication)
Operating Voltage (UB)24 ... 240 V AC / 12 ... 240 V DC
Protection ClassII (according to IEC 60664-1, EN 50178)
No-load Current (I0)≤ 40 mA
Power Consumption (P0)≤ 2 VA
Switching TypeDark-on
Signal OutputRelay, 1 alternator (SPDT)
Load VoltageMax 250 V AC/DC
Load CurrentMax 2 A
Switching PowerDC: max 50 W; AC: max 500 VA
Switching Frequency (f)20 Hz
Response Time≤ 25 ms
Product StandardIEC / EN 60947-5-2
Ambient Temperature-25 ... 55 °C
Storage Temperature-40 ... 70 °C
Degree of ProtectionIP67
ConnectionFixed cable (2 m)

Industrial Applications

1. Conveyor Belt Object Detection in Warehousing

This sensor can effectively detect the presence or absence of packages and items on long conveyor belt systems within logistics and manufacturing facilities. Its 14m range allows coverage of wider belts or multiple lanes, while the IP67 rating ensures reliable operation in dusty warehouse environments. The universal AC/DC voltage input simplifies integration into existing power schemes.

Problem Solved

Ensures precise material flow, prevents blockages, and triggers automated sorting or counting processes by reliably sensing objects across substantial distances and in demanding conditions.

Conveyor systemsMaterial handlingObject presence detectionWarehousing automationIP6714m rangeUniversal voltageRelay output

2. Industrial Gate Control and Access Monitoring

Ideal for monitoring vehicle and equipment traffic at industrial gates or access points. The 14m detection range is suitable for spanning wide entrances, and its IP67 rating combined with a -25 to 55 °C operating temperature makes it highly resilient to outdoor weather conditions. The robust relay output can directly control gate mechanisms.

Problem Solved

Provides reliable, all-weather vehicle detection for automated gate operation and security monitoring, enhancing site safety and efficiency by accurately signaling vehicle entry and exit.

Vehicle detectionGate automationAccess controlOutdoor useIP67Wide operating temperature14m rangeRelay output

3. Pallet Position Verification in Automated Storage and Retrieval Systems (AS/RS)

This sensor is well-suited for verifying the correct placement and presence of pallets within the storage racks of automated warehouses. Its 14m range allows for detection across multiple pallet positions or aisles, ensuring accurate inventory management. The IP67 protection guards against dust and minor spills common in such facilities, and the relay output provides a direct signal to PLC control systems.

Problem Solved

Prevents operational errors like mis-picks or collisions by confirming the accurate positioning of pallets in AS/RS, thereby improving the reliability and safety of automated warehousing processes.

Pallet detectionAutomated Storage and Retrieval Systems (AS/RS)Position verificationAutomated warehousingIP6714m rangeRelay outputIndustrial automation
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