Serviceline Industrial Sensors
Serviceline Explosion Protection

Thru-beam sensor LA39/LK39/31/40a/116

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

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  LA39/LK39/31/40a/116

Product Description
Thru-beam sensor, 20 m detection range, infrared light, light/dark on, AC/DC version, relay contact output, sensitivity adjuster, terminal compartment
System components
General specifications
Effective detection range0 ... 20 m
Threshold detection range25 m
Adjustment range2 ... 25 m
Reference targetreceiver
Light sourceIRED
Light typemodulated infrared light
Ambient light limitIEC / EN 60947-5-2 , 10000 Lux
Functional safety related parameters
MTTFd916 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Indicators/operating means
Operation indicatorLED red (emitter)
Function indicatorLED yellow: switching state
LED red: pre-fault indication
Control elementsSensing range adjuster, light-on/dark-on changeover switch
Electrical specifications
Operating voltage12 ... 240 V DC / 24 ... 240 V AC (50 ... 60 Hz)
Ripple10 %
No-load supply current≤ 60 mA receiver and emitter
Protection classII, 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 typelight/dark on
Signal output1 relay output
Switching voltagemax. 240 V AC ; 150 V DC
Switching currentmax. 3 A
Switching powerDC: max. 90 W AC: max. 750 VA
Switching frequency≤ 25 Hz
Response time≤ 20 ms
Product standardEN 60947-5-2
Approvals and certificates
EAC conformityTR CU 020/2011
TR CU 004/2011
CCC approvalCertified by China Compulsory Certification (CCC)
Ambient conditions
Ambient temperature-25 ... 55 °C (-13 ... 131 °F)
Storage temperature-40 ... 70 °C (-40 ... 158 °F)
Mechanical specifications
Housing width25 mm
Housing height64 mm
Housing depth75 mm
Degree of protectionIP67
Connectionterminal compartment PG9, ≤ 2.5 mm2
Optical facePMMA
MassEmitter: approx. 90 g receiver: approx. 110 g
General information
Scope of deliveryMounting aid


ECLASS 11.027270901
ECLASS 10.0.127270901
ECLASS 9.027270901
ECLASS 8.027270901
ECLASS 5.127270901
ETIM 8.0EC002716
ETIM 7.0EC002716
ETIM 6.0EC002716
ETIM 5.0EC002716
UNSPSC 12.139121528

Documents: LA39/LK39/31/40a/116

Instruction leafletsLanguageFile TypeFile Size
Instruction leaflet / Beipackzettel ALLPDF464 KB

CAD+CAE: LA39/LK39/31/40a/116

CADFile TypeFile Size
3-D model / 3-D-ModellSTP182 KB
CAD Portal / CAD PortalLINK---

Approvals+Certificates: LA39/LK39/31/40a/116

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0296BPDF185 KB

Associated Products: LA39/LK39/31/40a/116

Mounting bracket for RL39 series Sensorsfa

Function: LA39/LK39/31/40a/116

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, retroreflective 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 pre-fault diagnostics and pre-fault output. The switching element function can be changed using the light/dark switch.