Laser Sensors LRF-Series

Precise measurement under toughest environmental conditions is a complex task, that can be easily fulfilled with laser distance sensors of the LRF series. The LRF laser distance sensors have been succesfully proven in various industral fields for more than 10 years. Constant improvement of the electrical and opctical system has made the sensors more accurate, flexible and reliable.

LogoTek supplies reliable laser seonsors for distance measurement, particular in industrial applications. 

Available are sensors for distances from some meters up to 3 km and accuracies between 3 mm and 20 mm.  The devices are extremely robust and successfully proved in industrial applications over many years. Easy operation and a wide variety of interfaces and housings ensure, that the LRF series are applicable wherever you need them to detect distance of speed with high accuracy.

Various application fields

Detection of the Crane Position

Laser sensors are widely used for position detection of cranes. This function is necessary for automatic control of the crane, as well as for material tracking applications. The LRF laser distance sensors can deliver reliable performance over along measuring distance of up to 3 km.

Collision Warning

The digital outputs of the laser devices can be directly connected to the crane control PLC, in order to realize a collision warning and emergency stop function. Collision warning can be realized with or without reflectors at the opposite vehicle. Redundant configurations are an option, in order to increase the reliability.

Material Detection

Laser Distance sensors can be used as a replacement of light barriers and reflective sensors. The laser distance meter can measure on rough and hot surfaces with low reflectivity. This ensures reliable material dtection in applications where light barriers may fail.

Dimensional Measurement of Metal Parts

The dimension of metal parts like slabs and coils need to be checked to ensure a continuous high quality of the manufacturing process. LRF laser distance sensors can help to fulfill this task. Even hot material with temperatures of up to +1200 °C can be reliably measured in all dimensions. LogoTek´s laser processing software is taking care for pre-processing and logging of position values. 

Filling Level Detection

The filling level of gas tanks, liquid storages and dry bulk goods (as grain) can be measured with laser distance sensors. Depending on the application, the laser distance meters can be delivered in explosion proved versions and in protection housing that allow measurement in dusty areas.

Key features of the laser distance sensors

  • Laser Class 1 or Class 2, eye safe
  • High accuracy of up to ±2 mm
  • High operation speed (up to 0,1 ms / 100 Hz)
  • Long operation distance of up to 150 m (LRF200) or 3 km (LRF2000)
  • Reliable operation on different material surfaces
  • Robust aluminium housings
  • Protection class up to IP67 (water-protected)
  • Wide operation temperature range of the standard version
  • Extended temperature range from -40 °C up to +100 °C with protection housing and additional cooling
  • Vibration resistant construction


The LRF200 is operating with phase comparison to detect short and medium distances with an accuracy of up to ±3mm. On reflectors a distance of up to 150m can be measured. Due to protection class IP65 the devices are suitable for outdoor operation. The laser distance sensors can be supplied with  RS232, RS422, Profibus and 4..20mA-interface. 



Technical Data

  • Measuring Range: 0,1 bis 30 m on natural surface, 0,1 m bis 150 m on reflector
  • Measuring Accuracy: ± 3 mm at +15°C bis +30°C
  • Interface Options: RS232 and RS422 with 9,6 kBaud to 460,8 kBaud, Profibus DP-V0 Slave (9,6 kBaud to 12 MBaud), SSI (Gray Code, max. 1MHz), analog output 4 mA to 20 mA
  • Laser: Class 2, 650 nm (infrared)
  • Power Supply: 10 VDC to 30 VDC
  • Operation temperature: -10°C to +50°C
  • Dimensions: 212 mm x 96 mm x 50 mm
  • Weight: approx. 760g
  • Protection Class: IP 65


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The LRF250/251 is using the same optical principle as the LRF200, but the heavy duty housing makes it suitable for applications in rough industrial environments. Special features are the dust protection tube with optional air cleaning and a water cooling unit. Optional filters ensure reliable operation on hot or reflective material. Furthermore the device has additional interfaces and various accessories for a flexible use. 

The LRF250/251 is able to measure on hot surfaces of up to 1200°C. It is using run time and phase comparison of laser pulses to achieve an accuracy of ±2mm.


Technical Data

  • Measuring Range: 0,1 to 30 m on natural surfaces, 0,1 m to 150 m on reflector
  • Measuring Accuracy: ± 3 mm at +15°C bis +30°C
  • Interface Options: RS232 and RS422 with 9,6 kBaud to 460,8 kBaud, Profibus DP-V0 Slave (9,6 kBaud to 12 MBaud), SSI (Gray Code, max. 1MHz), analog output 4 mA to 20 mA
  • Laser: Class 2, 650 nm (infrared)
  • Power Supply: 10 VDC to 30 VDC
  • Operation temperature: -10°C to +50°C
  • Dimensions: 212 mm x 96 mm x 50 mm
  • Weight: approx. 1.300g
  • Protection Class: IP 65


Request offer 



The devices of the LRF 300 series are specialized for measuring on hot surfaces, like red hot glowing steel and in particular suitable for the usage in bright outdoor environments with high percentage of constant or stray light. These distance sensors measure and monitor the distances up to 500 m and with millimeter accuracy (measuring rate 100 Hz). Measuring targets can be almost any natural surface, including liquids. The lasers of the LRF300 series are dedicated for a simple system integration and the interface options are RS232, RS422,  RS485, SSI, Profisbus as well as digital switching ports, analog output and trigger. 



Technical Data

  • Measuring Range: 0,1 to 500 m
  • Measuring Accuracy: ± 1 mm
  • Interface Options: RS232, RS422 and RS485 with 9,6 kBaud to 460,8 kBaud, Profibus DP-V0 Slave (9,6 kBaud to 12 MBaud), SSI (Gray Code, max. 1MHz), analog output 4 mA bis 20 mA
  • Laser: Class 2, 635 nm (infrared)
  • Power Supply: 10 VDC to 30 VDC
  • Operation Temperature: -10°C to +50°C
  • Dimensions: 120 mm  x 76,5 mm x 40 mm
  • Weight: approx. 700g
  • Protection Class: IP 67


Request offer 





Optimally suited for big distances and rough environmental conditions, this laser distance meter allows a reflectorless, precise and fast distance detection on nearly all surfaces. When used with a reflector, distances of up to 3 km can be measured. The functional principle is based on the run time detection of short laser pulses. An integrated heating and protection class IP67 enable operation even under rough climatic conditions. A variety of analogue and digital interfaces allows the integration into any automation system.  

 Technical Data

  • Measuring Range: 0,5 m to 3.000 m
  • Measuring Accuracy : ± 20 mm at 100 Hz
  • Interface Options: RS232 and RS422 with 9,6 kBaud to 460,8 kBaud, Profibus DP-V0 Slave (9,6 kBaud to 12 MBaud), SSI (Gray Code), analog output 4 mA to 20 mA
  • Laser: class 1, 905 nm (eye safe)
  • Power Supply: 10 VDC to 30 VDC
  • Operation temp.: -40°C to +60°C
  • Dimensions: 136mm x 57mm x 104 mm
  • Weight: approx. 800g
  • Protection Class: IP 67


Request offer 



Dust Protection

In order to use the laser distance sensors in industrial environments, dust protection housings are available for all LogoTek laser devices. The LRF250/251 can be delivered with an extended dust protection tube to make it more insensitive to dusty environments ans splashing materials.


Laser applications in the heavy industry require reliable cooling of the measuring equipment to ensure operations uo to 100 °C. LogoTek offers different kinds of protection housings with Peltier colling elements, fan cooling, vortex collers (on request) or water cooling. Protection against radiation heat of hot material (like steel slabs) should be also considered and can be achieved through installation of metal heat shields.


The LRF250/251 can be delivered with an integrated heating to allow operating temperatures of down to -40°C. The cooling unit needs a power supply of 24V / 15W.


Exchangeable window glasses and filters can be used to make the laser sensors more insensitive to reflection or hot materials. The exchangeable window glasses protect the laser against damage by hot material and can be exchanged in minutes if they are damaged or scratched.

Laser supports

Various mounting plates and adjustable supports are available for all types of laser devices. Depending on the application, LogoTek offers simple supports for 2-dimensional adjustment or complex heavy duty verisons with 3-dimensional adjustment capability.

Air Purge

In very dusty environments a dst protection tube with air connection can be used to keep dust away from the optical system. The air purge system can be supplied together with air filters. An air filter with 5 µm particle size is recommended. In combination with a vortex cooler, the air system can be used for both cooling and cleaning of the optical system. 




Please ask our sales department for a complete list of accessories.


Latest News

March 2014 - Valin ArcelorMittal Automotive Steel Co.,Ltd.(VAMA) awards a contract for material tracking to LogoTek
Beyond this, there will be eventhough installed a crane tracking system on each of the in total 18 cranes and a wireless-LAN-communication. LogoTek-Software will be in addition responsible for the tracking of the material transportations and for booking the coils in its new locations. more


September 2013 - Big Order from Taiwan
The Formosa Plastics Group from Taipeh/Taiwan just decided to put the responsibility in terms of the technology for material tracking for their new steelworks in Vietnam into the hands of more


August 2013 - Extension of the heavy plate logistic system in Duisburg
Four additional halls and seven cranes will be integrated in the yet existing yard management system. more


June 2013 - LogoTek gets a contract for an optical identification system for steel billets
The Dragon Steel Corporation,a subsidiary of the biggest steel manufacturer in Taiwan the China Steel Co., just ordered LogoTek with the delivery of a system for the identification of steel billets. more


April 2013 - ThyssenKrupp Steel Europe AG just ordered LogoTek with the delivery of a marking machine for heavy plates
LogoTek will be responsible for the technical construction, manufacturing, installation and commissioning of the marking machine. more



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