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RLK39-8-2000/31/40a/116

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Pepperl+Fuchs RLK39-8-2000/31/40a/116 is an infrared diffuse-mode photoelectric sensor that detects objects within 2 m and switches a relay output for a control circuit.
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Technical specifications for RLK39-8-2000/31/40a/116

  • Manufacturer:
    Pepperl + Fuchs
  • Part Number:
    RLK39-8-2000/31/40a/116
  • Product Family:
    Pepperl + Fuchs
  • Product Type:
    RLK39 Diffuse Mode Photoelectric Sensor
  • Stock:
    1
  • Detection Range:
    0 to 2000 mm
  • Adjustment Range:
    200 to 2000 mm
  • Light Source:
    Modulated infrared IRED
  • Ambient Light Limit:
    10000 lux
  • Operating Voltage:
    12 to 240 V DC or 24 to 240 V AC
  • No-Load Supply Current:
    35 mA maximum
  • Power Consumption:
    3 VA maximum
  • Time Before Availability:
    50 ms maximum
  • Switching Mode:
    Light-on or dark-on, selectable
  • Signal Output:
    One relay output
  • Maximum Switching Voltage:
    240 V AC or 150 V DC
  • Maximum Switching Current:
    3 A
  • Maximum Switching Power:
    90 W DC or 750 VA AC
  • Switching Frequency:
    25 Hz maximum
  • Response Time:
    20 ms maximum
  • Degree of Protection:
    IP54
  • Connection:
    PG9 terminal compartment, 0.75 mm² maximum
  • Operating Temperature:
    -25 to +55 °C
  • Weight:
    0.2425 lbs (0.11 kg)
  • Estimated shipping dimensions:
    8.18x6.4x2.5cm
  • Tariff Code:
    85365080
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Detection Path Range Setup Terminal Circuit Mounting Check

Features:

  • Detects diffuse targets over an adjustable 200 to 2000 mm range.
  • Accepts 12 to 240 V DC or 24 to 240 V AC supply power.
  • Provides a selectable light-on/dark-on relay output with local status LEDs.
The emitter and receiver share one housing, so no separate reflector is required for target detection.

A yellow indicator follows the relay state, while a red indicator reports reduced optical reserve.

The PG9 terminal compartment separates the power pair from the normally open relay contact.

The Pepperl+Fuchs RLK39-8-2000/31/40a/116 RLK39 Diffuse Mode Photoelectric Sensor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Pepperl+Fuchs RLK39-8-2000/31/40a/116 RLK39 Diffuse Mode Photoelectric Sensor Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Following reflected infrared light into the relay decision

  • Emission: The IRED sends modulated infrared light toward the target area.
  • Reflection: The object returns part of that light to the receiver in the same housing.
  • Evaluation: The sensor compares the received level with the range setting.
  • Switching: The qualified detection state controls the relay according to the selected mode.

Relating target position, surface and sensitivity adjustment

  • Reference target: The published range uses a standard white 200 mm by 200 mm target.
  • Dark objects: Lower reflectivity reduces the usable distance and alignment margin.
  • Adjustment: The sensitivity control is set after the object and background positions are fixed.
  • Reserve warning: A red LED marks inadequate received-light reserve before stable detection is lost.

Separating the universal supply from the switched relay load

  • Supply pair: Terminals 1 and 2 accept the documented AC or DC supply.
  • Contact pair: Terminals 3 and 4 form the normally open relay output.
  • Load limit: The external circuit remains within the relay voltage, current and power limits.
  • Closed cover: The terminal cover must be secured to maintain the documented protection class.

Preserving alignment through installation and maintenance

  • Rigid surface: The housing is mounted without distortion through its fixing holes or bracket.
  • Cable preparation: The cable length and strip length follow the terminal-compartment drawing.
  • Alignment: The optical axis is aimed at the required target position before sensitivity is set.
  • Maintenance: Optical faces, fasteners and electrical connections are checked when the red LED indicates reduced reserve.
Description
Pepperl+Fuchs RLK39-8-2000/31/40a/116 is an RLK39 diffuse-mode photoelectric sensor that combines an infrared emitter, receiver and relay switching stage in one housing. It detects an object from its returned light and transfers the evaluated state to a control circuit.

The sensing-range adjuster on RLK39-8-2000/31/40a/116 sets the usable target distance between 200 and 2000 mm. Object color and size affect the returned light, while the red pre-fault LED warns when dirt, misalignment or a weak reflection reduces the functional reserve.

Supply power enters RLK39-8-2000/31/40a/116 through terminals 1 and 2, and the normally open relay path is connected through terminals 3 and 4. The universal input accepts the documented AC or DC range, while the isolated relay contact switches the external load circuit.

Light-on or dark-on selection determines whether RLK39-8-2000/31/40a/116 energizes its relay when the target is detected or when the beam return is absent. The yellow LED follows that switching state so alignment and control behavior can be checked at the sensor.
Alternative Names
RLK39 8 2000 31 40a 116 Pepperl+Fuchs RLK39-8-2000/31/40a/116 RLK39-8-2000-31-40a-116 RLK39820003140A116 P+F RLK39-8-2000/31/40a/116 RLK39-8-2000 31 40a 116 088827 RLK39-8-2000/31/40a/116 RLK39-8-2000/31/40A/116 Sensor
Technical notes
Set the light-on/dark-on selector and sensing-range adjuster on RLK39-8-2000/31/40a/116 only after the target and background are aligned.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why does RLK39-8-2000/31/40a/116 detect a white target but miss a dark one at the same distance?
Dark surfaces return less infrared light, so RLK39-8-2000/31/40a/116 requires a shorter distance or a revised sensing-range setting.
What does the red LED mean on Pepperl+Fuchs RLK39-8-2000/31/40a/116?
The red LED on Pepperl+Fuchs RLK39-8-2000/31/40a/116 signals reduced received-light reserve caused by dirt, misalignment or a weak target reflection.
How is light-on or dark-on behavior selected for RLK39-8-2000/31/40a/116?
Use the mode selector on RLK39-8-2000/31/40a/116 after deciding whether the relay should energize with a detected target or without one.
Which terminals carry the relay output of RLK39-8-2000/31/40a/116?
Terminals 3 and 4 of RLK39-8-2000/31/40a/116 form the normally open relay contact; terminals 1 and 2 are the supply pair.
Can RLK39-8-2000/31/40a/116 operate from either AC or DC power?
Yes. RLK39-8-2000/31/40a/116 accepts 12 to 240 V DC or 24 to 240 V AC within the documented frequency range.
What should be checked if RLK39-8-2000/31/40a/116 changes state intermittently?
Clean the optical face, verify mounting alignment, check the target distance and readjust the sensitivity of RLK39-8-2000/31/40a/116.