OEM laser module RF51A

Powerful laser distance measurement for integration in existing measuring systems

The RF51A is an OEM laser module to integrate laser distance measurement capabilities into existing measurement equipment. It consists of the laser measuring module and an interface board. Compared to the industrial laser distance measurement gauge LDM51, the housing and the control elements are omitted.
The OEM laser module RF51A measures contactless the distance between itself and nearly every surface and material. Up to a distance of 100 m no additional reflectors are required for measuring. The maximum distance exceeds the range of 200 m. Due to the high measuring frequency of 100 Hz also fast movements of the target can be captured.


The OEM laser module RF51A operates with a modulated visible laser with low beam divergence. Newly developed algorithms and most modern technologies of the opto-electronic signal processing allow a save, highly precise and fast distance measurements that can be applied in almost all areas of machinery and plant engineering.
Other application examples are level measurement, detection of geometric dimensions like length, width or thickness and position measurement.
While developing the OEM laser module RF51A there was paid particular attention to the operation in outdoor areas with high influence of constant light by solar radiation and high temperatures.

  • Plant automation and process technology
  • Positioning applications in transportation and logistic
  • Distance measurement in mining, building, forestry and material-handling technology
  • Machine-observation and -positioning in metal industry e.g. rolling-mills, de-coiler
  • Long term observation of buildings and technical installations, e.g. churches, tide gates, docks
  • Position and height detection in crane applications
  • Level measurement in silos and heaps on materials like sand, earth, feed, cereals, cement
  • Thickness, length and width detection
  • Volume and area calculation
  • Diameter of steel coils
  • Distance measurement on hot glowing steel with temperatures over 1300 °C


  • OEM laser module
  • Contactless laser distance measurement on nearly every type of surface
  • Reliable operation in outdoor applications under high common light influence
  • Measuring even on extremely bad reflecting targets (coal, rubber, rust)
  • Riskless usage due to eye-safe visible laser beam (Laser class 2, EN 60825-1:2007)
  • 3 programmable digital output lines
  • Freely programmable and scalable analogue interface (4 mA ... 20 mA)

Technical Data

General measurement range 0.15 m ... 200 m
Typical measurement ranges
On special reflective target (Oralite 5200)
Reflecting foil (3M 3279)
Natural surfaces, 80% remission
Natural surfaces, 6% remission

50 m ... 200 m

0.15 m ... 100 m
0.15 m ... 100 m
0.15 m ... 85 m
Accuracy, absolute (1 σ) ≤ ± 3.9 mm
Repeatability, max. (standard deviation) ± 0.6 mm
Resolution 0.1 mm
Measurement period, min. 10 ms
Laser class Laser class 2, EN 60825-1:2014
Laser Wavelength 655 nm
Laser beam divergence < 0.2 mrad
Interfaces RS232, RS422, RS485 (selectable)
Optional: Profibus DP-V0 Slave, 12 MBaud, IEC 61158 / IEC 61784
Optional: SSI (50 kHz ... 1 MHz)
Digital switching output lines 3 x High-Side-Switch, max. 0.2 A
Analog Interface 4 mA ... 20 mA
Trigger line 1 x Trigger IN / OUT, 3 VDC ... 30 VDC
Connections 1 x 12-pin M16
Optional: 1 x 8-pin M12 for SSI-Interface
Optional: 2 x 5-pin M12 for Profibus DP-V0
Power supply 10 VDC ... 30 VDC
Power consumption < 10 W
Operating temperature -40 °C ... 60 °C
Weight 100 g
MTBF 35,435 hours (MIL HDBK 217 F)


Mr. Daniel Strandt

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