Riftek's Absolute Linear Position Sensors

RIFTEK has introduced absolute linear position sensors, also known as absolute linear encoders, engineered to quantify and check dimensions, displacements, surface profiles, run-outs, and deformations of engineered objects.

The RIFTEK absolute linear encoders come in two models:

  • RF251 for hard industrial environments;
  • RF256 sensors with a built-in display option for laboratory environments.

RF251 Series

  • ​Wide temperature range
  • IP57

                                                                                                         See detailed specifications

RF256 Series

  • Built display option
  • Batteries powered

  See detailed specifications




Operation of the sensors is based on the principle of photoelectric scanning of special scale, connected with a measurement tip of the sensor. Radiation of a LED 1 is collimated by a lens 2 and is directed on a scale 3. The image of area of the scale is examined by CMOS array 4 and is analyzed by signal processor which calculates position of the scale.

As compared with incremental sensors, absolute sensors have a number of advantages: the absolute position of the gauge plug is determined immediately after power is on and the necessity of search of the reference mark is excluded. 


Also excluded is the probability of accumulation or loss of count pulse signals in case of  impacts, vibrations and reverse motion.




  • Width measurements


  • Parts dimensions


  • Object and target displacements


  • Object deformation


  • Runout


  • Flatness

Absolute contact sensor RF25.avi


Find detailed information about this device here.

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