Absolute Linear Encoders

RF251-256smmAbsolute encoders are designed for measuring and checking displacements, dimensions, run-outs, surface profiles and deformations of engineered objects.

Riftek’s absolute encoder series includes two models: The RF251 for hard industrial environments and the RF256 sensors with a built-in display option for laboratory environments.

  • RF 251 Series
    • wide temperature range
    • IP67
    -rtkl _Measuring ranges, mm: 3 and 25
    _Accuracy, µm: ± 1
    _Resolution, µm: 0,1; 0,5 and 1
    RF 256 Series 
    • built display option
    • batteries powered
    -rtkl _Measuring ranges, mm: 15, 35 and 55
    _Accuracy, µm: ± 1
    _Resolution, µm: 0,1; 0,5 and 1
  • Specifications

    1. Absolute linear encoders RF251 and RF256 specifications

    ( click on the image to zoom )
  • Operation

    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 gage 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.


  • Applications

    High precision contact measurements:
     bullet Parts Dimensions encoders_shirina_diametr_sm
     bullet Width Measurements encoders_shirina_sm
     bullet Object and Target Displacements  encoders_peremeschenie_sm
     bullet Runout encoders_bienie_sm
     bullet Flatness  encoders_ploskost_smjpg
     bullet Object Deformation encoders_deformacii_sm

  • Video

    1. Absolute contact sensor RF25

  • Order Info

    1. Order information for Absolute Linear Encoders

    ( click on the image to zoom )