Pepperl+Fuchs LA39/LK39/31/40a/116 Thru-beam sensor

Pepperl+Fuchs  Series 39 sensors are characterized by their high performance level, compact housing design, and variety of available versions. These include thru-beam sensors with a 20 m detection range, retro reflective sensors with polarization filter for a 5 m detection range, energetic diffuse mode sensors with an 800 mm and 2000 mm detection range, and a background suppression sensor with 500 mm detection range.

Fitted in a robust plastic housing, this series is ideal for tough industrial applications. The sensors are supplied with 10 V to 30 V DC, or 24 V to 240 V AC/DC. Various transistor and relay outputs are available as signal outputs. Standard features include prefault diagnostics and pre-fault output. The switching element function can be changed using the light/dark switch.


  • Light/dark ON, switchable
  • Supplied with mounting accessory
  • Degree of protection IP67

Technical Data

System components
Emitter LA39/116
Receiver LK39/31/40a/116
General specifications
Effective detection range 0 … 20 m
Threshold detection range 25 m
Adjustment range 2 … 25 m
Reference target receiver
Light source IRED
Light type modulated infrared light
Ambient light limit IEC / EN 60947-5-2 , 10000 Lux
Functional safety related parameters
MTTFd 916 a
Mission Time (TM) 20 a
Diagnostic Coverage (DC) 0%
Indicators/operating means
Operation indicator LED red (emitter)
Function indicator LED yellow: switching state
LED red: pre-fault indication
Control elements Sensing range adjuster, light-on/dark-on changeover switch
Electrical specifications
Operating voltage 12 … 240 V DC / 24 … 240 V AC (50 … 60 Hz)
Ripple 10%
No-load supply current ≤ 60 mA receiver and emitter
Protection class II, rated voltage ≤ 250 V AC with pollution degree 1-2 according to IEC 60664-1 Caution!
The protection class 2 is only valid when the terminal compartment is closed. output circuit has basic insulation to control circuit according to IEC/EN 61140
Power consumption ≤ 3 VA
Time delay before availability ≤ 300 ms
Switching type light/dark on
Signal output 1 relay output
Switching voltage max. 240 V AC ; 150 V DC
Switching current max. 3 A
Switching power DC: max. 90 W AC: max. 750 VA
Switching frequency ≤ 25 Hz
Response time ≤ 20 ms
Product standard EN 60947-5-2
Approvals and certificates
EAC conformity TR CU 020/2011
TR CU 004/2011
CCC approval Certified by China Compulsory Certification (CCC)
Approvals CE
Ambient conditions
Ambient temperature -25 … 55 °C (-13 … 131 °F)
Storage temperature -40 … 70 °C (-40 … 158 °F)
Mechanical specifications
Housing width 25 mm
Housing height 64 mm
Housing depth 75 mm
Degree of protection IP67
Connection terminal compartment PG9, ≤ 2.5 mm2
Housing PBT
Optical face PMMA
Mass Emitter: approx. 90 g receiver: approx. 110 g
General information
Scope of delivery Mounting aid

Download Datasheet: Pepperl+Fuchs LA39/LK39/31/40a/116 Thru-beam sensor 


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