Pepperl+Fuchs LA39_LK39-Z_31_40a_116 Thru-beam Sensor

USD 150.00

Rugged AC/DC thru-beam sensor with 20m range, light/dark switching, timer function, and relay output. IP54 rated for industrial environments.

SKU PEPPERL-FUCHS-LA39/LK39-Z/31/40a/116 Category
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Pepperl+Fuchs LA39/LK39 Thru-beam Sensor

Model Identifier LA39/LK39-Z/31/40a/116
Official Part Number LA39/LK39-Z/31/40a/116
GTIN Standard NA

Technical Overview

The Pepperl+Fuchs LA39/LK39-Z/31/40a/116 is a thru-beam sensor system comprising an emitter (LA39/116) and a receiver (LK39-Z/31/40a/116). It features a 20 m detection range, infrared light, switchable light-on/dark-on modes, and an AC/DC power version. Equipped with a relay contact output, a sensitivity adjuster, and a timer function, it's housed in a robust plastic casing (PBT) and designed for tough industrial applications.

Key Features

  • Light-on/dark-on, switchable operation
  • Integrated timer function
  • Effective detection range of 0 to 20 meters
  • Wide operating voltage range: 12-240 V DC / 24-240 V AC
  • Equipped with 1 relay output
  • Utilizes infrared (IRED) modulated light
  • Robust PBT housing with PMMA optical face
  • IP54 degree of protection
  • Terminal compartment PG9 connection
  • Supplied with mounting accessory
  • Includes sensitivity adjuster

Versatile AC/DC operating voltage, combined with a 20m detection range and a programmable timer function for flexible object detection and control.

Technical Specification Matrix

ParameterValue
System ComponentsEmitter LA39/116, Receiver LK39-Z/31/40a/116
Effective Detection Range0 ... 20 m
Threshold Detection Range25 m
Operating Voltage (UB)12 ... 240 V DC / 24 ... 240 V AC
Switching TypeLight-on/dark-on, switchable
Signal Output1 relay output
Light SourceIRED (Infrared)
Light TypeModulated infrared light
Ambient Light Limit10000 Lux
Ambient Temperature-25 ... 55 °C (-13 ... 131 °F)
Degree of ProtectionIP54
ConnectionTerminal compartment PG9, ≤ 0.75 mm²
Housing MaterialPBT
Optical Face MaterialPMMA

Industrial Applications

1. Material Flow Monitoring on Conveyor Belts

This thru-beam sensor is ideal for reliable object detection and material flow monitoring on industrial conveyor belts. Its 20m detection range allows it to span wide conveyors or multiple lanes, ensuring efficient and uninterrupted material transport.

Problem Solved

Prevents material jams, controls flow rates, and provides real-time feedback for automated material handling systems, reducing downtime and improving operational efficiency.

Conveyor systemMaterial handlingObject detectionFlow controlIndustrial automationRelay controlIP54

2. Access Control and Safety Monitoring for Industrial Gates

The sensor can be deployed across large industrial gates or machinery access points to detect the presence of personnel or vehicles. Its robust IP54 rating makes it suitable for outdoor or challenging factory environments, and the relay output can directly interface with gate control systems.

Problem Solved

Enhances safety by preventing gates from closing on obstructions, controlling access to restricted areas, and integrating with safety interlock systems to protect operators and equipment.

Industrial safetyAccess controlGate automationPersonnel detectionVehicle detectionSafety interlockIP54Relay output

3. Pallet Presence and Height Monitoring in Automated Warehouses

Capable of detecting pallets on automated conveyors or within storage bays over distances up to 20m. Multiple units can be configured to verify correct pallet height, ensuring proper fit into storage racks and preventing damage to goods or infrastructure.

Problem Solved

Ensures accurate pallet positioning, prevents damage from oversized loads in automated storage and retrieval systems (AS/RS), and contributes to precise inventory management in logistics operations.

Automated warehousingPallet detectionHeight monitoringLogisticsInventory controlAS/RSMaterial trackingIP54
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