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Absolute Linear Encoders

HomeDisplacement Sensors / Measurement SensorsAbsolute Linear Encoders
Absolute Linear Encoders

Absolute 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.

RF251 Series
  • wide temperature range
  • IP67
Measuring range, mm: 3, 25
Accuracy, µm:  ±1

Resolution, µm:

0.1, 0.5, 1

RF256 Series
  • built display option
  • batteries powered (option)

Measuring range, mm:
6, 25 
Accuracy, µm: ±1

Resolution, µm:

0.1, 0.5, 1


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.