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The RT8420 combines the superb linearity and resolution of a plastic-hybrid potententiometer with the durability of Celesco’s 4...20 mA circuit to provide an accurate and reliable electrical signal over all ranges. Additionally, the RT8420 has fully accessible zero and span settings allowing precise matching of the output signal to the required measurement. 


  • Industrial Grade Rotational Position Sensor 
  • Absolute Rotary Position up to 200 turns 
  • Aluminum or Stainless Steel Enclosure Options 
  • IP68 / NEMA 6 

Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Product Type  4 – 20 mA Transmitter

Configuration Features

  • Electrical Connection  Connector, Waterproof Cable

Electrical Characteristics

  • Supply Voltage (VDC) 8 – 34

  • Input Current (mA) 4 – 20

  • Output Current (Max) (mA) 4 – 20 mA

Signal Characteristics

  • Frequency Response (Hz) <1K

Body Features

  • Angular Sensing Range (°) 1080, 10800, 14400, 180, 1800, 18000, 28800, 360, 3600, 36000, 43200, 45, 50400, 64800, 720, 7200, 72000, 90

  • Weight (g) 2300


  • Shaft Diameter .25 mm [ 6 in ]

Usage Conditions

  • Temperature Coefficient of Output (ppm/°K) .01%

  • Operating Temperature Range -40 – 100 °C [ -40 – 200 °F ]

Packaging Features

  • Package  Dia 2.5in Housing


  • Non-Linearity (FSO) (%) .15, .2, .5, 1.25

  • Sensitivity  Virtually Infinite

  • Output Impedance (Ω) 100000000

  • Non Repeatability and Hysterisis  .05

  • Torque (in-lbs) 2

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