Serviceline Industrial Sensors
Serviceline Explosion Protection

Retroreflective area sensor RLG28-55-4921/115b/136

  • Retro-reflective area sensor with 6 light beams in standard photoelectric-sensor enclosure
  • Connection compatibly replaces single beam photoelectric sensor
  • Reliable detection of the front edge of the object irrespective of its shape and position
  • Constant object detection from 12 mm within the entire detection area
  • Reliable detection of all surfaces irrespective of the object texture
  • Switches when contrast difference 10%
  • Bright, highly visible transmitter beams guarantee convenient alignment of the sensor

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  RLG28-55-4921/115b/136

Product Description
Retroreflective area sensor with 6 beams in a widely used standard photoelectric housing, red light, 4 m detection range, light/dark on, push-pull output, fixed cable with M12 plug
General specifications
Effective detection range0 ... 4 m
Reflector distanceReflector A80: 0.4 ... 4 m , H85-2 reflector: 0.2 ... 4 m , Foil reflector OFR-100/100: 0.4 ... 3 m
Threshold detection range5.6 m
Sensing rangetypical 60 mm , Object has to cover the refelector completely in one dimension
Reference targetReflector A80 H85-2 reflector Foil reflector OFR-100/100
Light sourceLED
Light typemodulated visible red light , 625 nm
Polarization filteryes
Number of beams6
Diameter of the light spotapprox. 220 mm at detection range 4 m
Opening angle+/- 2.5 °
Ambient light limit5000 Lux
Resolution12 mm
to 4 m Detection/capture range: 60 mm (no dead band)
5 mm
to 1 m Detection/capture range: 55 mm (dead band: 150 mm in front of the sensor; 50 mm in front of the reflector)
5 mm
to 1.5 m Detection/capture range: 40 mm (dead band: 150 mm in front of the sensor; 50 mm in front of the reflector)
Functional safety related parameters
MTTFd310 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Indicators/operating means
Operation indicatorLED green, statically lit Power on
Undervoltage indicator: Green LED, pulsing (approx. 0.8 Hz)
short-circuit : LED green flashing (approx. 4 Hz)
Function indicator2 LEDs yellow, light up when light beam is free, flash when falling short of the stability control, off when light beam is interrupted
Teach-In : LED yellow/green; equiphase flashing; 2,5 Hz
Changeover signal tracking: LED yellow, 1 Hz flashing / 2x flashing
Control elementsTeach-In key
Electrical specifications
Operating voltage12 ... 30 V DC
Ripplemax. 10 %
No-load supply currentmax. 50 mA
Switching typelight/dark on
Signal output2 push-pull (4 in 1) outputs, complementary, short-circuit proof, reverse polarity protected
Switching voltagemax. 30 V DC
Switching currentmax. 100 mA
Voltage drop≤ 2.5 V DC
Switching frequency230 Hz
Response time1 ms
Product standardEN 60947-5-2
Approvals and certificates
UL approvalcULus Listed, Class 2 Power Source
CCC approvalCCC approval / marking not required for products rated ≤36 V
Ambient conditions
Ambient temperature-10 ... 40 °C (14 ... 104 °F)
-30 ... 60 °C (-22 ... 140 °F) at active signal tracking
Storage temperature-40 ... 70 °C (-40 ... 158 °F)
Mechanical specifications
Degree of protectionIP67
Connection300 mm fixed cable with M12 x 1, 4-pin connector
HousingPlastic ABS
Optical facePlastic pane
Mass100 g
Height88 mm
Width25.8 mm
Depth54.3 mm


ECLASS 13.027270910
ECLASS 12.027270910
ECLASS 11.027270910
ECLASS 10.0.127270910
ECLASS 9.027270910
ECLASS 8.027270910
ECLASS 5.127270910
ETIM 9.0EC002549
ETIM 8.0EC002549
ETIM 7.0EC002549
ETIM 6.0EC002549
ETIM 5.0EC002549
UNSPSC 12.139121528

Details: RLG28-55-4921/115b/136


The RLG28 retro-reflective area sensor contains several transmitters and receivers in one housing and with a reflector positioned opposite forms a 60 mm detection area over a sensing range of 4 m.

When the light beams are interrupted by an object, the switching function is triggered. The smallest detectable object size is 12 mm. The RLG28 switches at a 10% contrast difference with a response time of 1 ms. An intelligent gain control compensates for effects such as dirt, misalignment, and temperature.

Product Documentation: RLG28-55-4921/115b/136

Language Selection:
Brief InstructionsLanguageFile TypeFile Size
RLG28: Alignment and Teach-In / RLG28 - Hinweise zur Ausrichtung und Teach-InALLPDF1086 KB
Instruction leaflet / BeipackzettelALLPDF682 KB

Design / Simulation: RLG28-55-4921/115b/136

Language Selection:
CADLanguageFile TypeFile Size
3-D model, 4-pin M12 plug, straight / 3-D-Modell M12-Stecker, gerade, 4-poligALLSTP1869 KB
CAD Portal / CAD PortalALLLINK---

Approvals: RLG28-55-4921/115b/136

Language Selection:
CertificatesCert No.LanguageFile TypeFile Size
Canada USA UL Ordinary LocationE87056ALLLINK---
Declaration of Conformity
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-2257CALLPDF226 KB
UK Declaration of Conformity (P+F) / UK-Konformitäterklärung (P+F)DOC-6945ALLPDF223 KB

Associated Products: RLG28-55-4921/115b/136


Reflector, rectangular 84.5 mm x 84.5 mm, mounting holesfa

Female cordset single-ended M12 straight A-coded, 4-pin, PVC cable greyfa

Female cordset single-ended M12 straight A-coded, 4-pin, PUR cable greyfa

Female cordset single-ended M12 angled A-coded, 4-pin, PUR cable greyfa
Mounting aid for round steel ø 12 mm or sheet 1.5 mm ... 3 mmfa
Mounting bracket: mounting aid for sensors in the RL* seriesfa
Mounting bracket for rear wall mountingfa
dove tail mounting clampfa
Reflector, rectangular 80 mm x 50 mm, self-adhesivefa
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