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LDM302: measuring precise distances on low reflectance surfaces.

The LDM302 is the Ideal Laser Distance Sensor for low reflectance surfaces.

LDM302 Series

The LDM302 series of laser distance sensors is specifically built to measure distances with high precision for surfaces of low reflectance (e. g. asphalt, grass, oxidized steel and aluminum). The LDM302 series is capable of measuring moving or static objects up to 3,000 meters with low reflectance. 

LDM302’s have proven themselves in the field by measuring moving objects with a reflectance of 6% at distances of 200 meters (Ship Docking Trials).  LDM302’s have proven successful in the control of container moving trams, overhead crane positioning, load retrieval, and load setting trials.  The LDM302 has been used on aircraft to calculate the altitude of the airframe during flight.

LDM302 series laser range finders rely upon the proven time-of-flight measurements (also used in the LDM301’s and LSD30) to make their distance and speed measurements. The time-of-flight method allows the LDM302 to measure moving objects even with less than 3% reflectance at distances of 50 meters. 

The fully customizable LDM302 modular configuration allows these laser range finders to be easily adapted to the harshest environments while maintaining high precision and accuracy. The ability to select either fixed or variable sampling rates is accommodated by this modularity. 

The LDM302 has the entire connectivity options associated with the other LDM series distance sensors enabling (RS-232, RS-422, RS-485, Profibus, and SSI) along with the ability to switch between analog and digital output.  Their chassis have been EMI hardened, o-ring sealed, and made both water and abrasive resistant in order to survive real world applications (IP67 / NEMA 6).

The compact, modular design combined with existing or customizable options enables the LDM302 to be retrofitted into existing systems as easily as new builds for real time, real world, distance and speed measurements with low reflection bodies under critical operating conditions.


  • Precise: Measurements ± a few millimeter.
  • Easy to use:  Visible laser enables naked eye alignment of range finding system. 
  • Flexible: With their serial interface, Profibus DP, individually configurable switching, multiple operating modes and analog outputs.
  • Robust: Case hardened chassis with o-ring seals to keep dust, water spray, and the elements out of the optical system.  Optional internal heating elements extend operating range from -40 oC to +50 oC. 
  • Economical: Non-contact measurements reducing wear, extending MTBF, service life, and maintenance.

Fields of application

  • Automation: Liquid and solid level measurement, process control and position monitoring.
  • Metrology: Distance and position measurements (thickness, length, height,  and depth).
  • Process control: Lift system positioning, water level / lock door operation.
  • Logistics: Position for goods, transport and loading systems, conveyor systems, levels, collision protection, part detection.

Product preview

Technical facts

Feature Value
Invisible measuring beam: 905 nm
Pin-point alignment: red pilot laser (class 2 laser)
Measuring range natural surfaces 6% reflectivity: 200 m
Measuring range natural surfaces  80% reflectivity: 500 m
Measuring range reflective surfaces: 3,000 m
Measuring accuracy: 60 mm
Measuring frequency: Up to 100 Hz
Eye safe: Class 1 laser
Interface options: RS-232, RS-422, analog
Measuring functions (excerpt): User-specific parameterization, switchable outputs, triggers and synchronization
For more information, please refer to downloadable PDF data sheet below.


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Do you have questions? Please contact us for more information.

Sales Laser Distance Sensors

+49 3641 65-3125

Sales Industrial Sensors

+1 561 881 7400 x1205

+81 045-345-0003

+81 045-345-0013

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