Laser distance measurement device for distances up to 3000 m

The LDM301A measures distances to targets up to 3000 m away with a precision down to the centimeter. It is able to detect the speed of moving objects with high accuracy. Operated without a reflector, the LDM301A convinces with a range of 300 m on almost each surface.


In addition to the large working range, the LDM301A is characterized by very short measuring times down to 0.1 ms. The compact design of the device, the easy set-up and the standard interfaces RS422 or RS232 allow for easy installation and operation. The status of the device can be monitored via LED display during operation.

The heating integrated in the device ensures reliable operation at temperatures as low as -40°C. The LDM301A offers the option to add a visor or additional interfaces, such as PROFIBUS DP and SSI.


  • Process monitoring in steel and rolling mills
  • Fill level measurement
  • Monitoring and positioning of cranes and conveying systems
  • Position control
  • Measurements at difficult-to-access measuring points in cavities, tubes, containers and cases
  • Position monitoring of vehicles and vessels


  • Large operating range, also without reflector
  • Laser transit time measurement allows for very short measuring times
  • Safe operation through invisible laser, class 1 laser
  • Integrated red pilot laser, optional visor for alignment
  • Programmable analog output 4 mA to 20 mA
  • Serial programming interfaces RS232 or RS422
  • Compact design, protection class IP 67
  • Customized parameterization via the PC software LDMTool
  • Easy installation and operation

Technical Data

Measuring range1 0.5 ... 300 m on almost all natural surfaces2,
up to 3 km with a target plate
Measurement uncertainty ±20mm at 2 kHz measuring rate and 100 Hz output rate
Resolution 1 mm
Measuring time

0.5 ms (optional 0.1 ms)

Measuring range for velocity 0 m/s ... 100 m/s (measuring time 0.1 s ... 0.5 s)3
Measuring laser 4

905 nm (infrared), laser class 1, EN 60825-1:2003-10

Pilot Laser 650 nm (visible red), laser class 2, ≤ 1 mW
(on, off, flashing)
Operating temperature -40 °C ... +60 °C
Storage temperature -40 °C ... +70 °C
Supply voltage

10 VDC ... 30 VDC

Power consumption

< 5 W (operation without heating)
11.5 W (operation with heating at 24 V)


RS 232 or RS 422, 1.2 kBaud ... 460.8 kBaud, ASCII, 8N1
Programming with Windows terminal program (e.g. LDMTool or Hyper Terminal)
Profibus DP, SSI (optional)

Switching outputs

2 x "high side" switches, output current max. 0.2 A, permanently short-circuit-proof, adjustable window function

Analog output

Programmable distance range limits, 4 mA ... 20 mA


Aluminum anodized

Size (LxBxH) 136 mm x 57 mm x 104 mm
Weight ca. 800 g
Protection class IP 67
Shock resistance

10 g / 6 ms persistence shock DIN ISO 9022-3-31-01-1


13,000 hours (MIL HDBK 217 F N2)

Remarks on the technical data of the LDM301A
1 depending on target reflectance, influence of extraneous light and atmospheric conditions
2 natural, diffuse reflecting surfaces; for targets under 10 m no poorly reflecting materials (dark/black surfaces)
3 Measuring distance to an object: 0.5 m...700 m
4 Standard version: 1.7 mrad, special version: 10 mrad


Mr. Daniel Strandt

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